Bibliografias temáticas / Mortier – Analyse

Literatura científica selecionada sobre o tema "Mortier – Analyse"

Autor: Grafiati

Publicado: 7 de julho de 2024

Última modificação: 7 de julho de 2024

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Artigos de revistas sobre o assunto "Mortier – Analyse"

Achour, Mokhtar, Nadia Belas e Rachid Hadj Sadok. "L'effet de l'incorporation des sédiments calcinés et de la perlite comme remplacement partiel du ciment sur le comportement des mortiers". Journal of Engineering and Exact Sciences 10, n.º 2 (31 de março de 2024): 18696. http://dx.doi.org/10.18540/jcecvl10iss2pp18696.

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L'accumulation de sédiments dans de nombreux barrages construits en Algérie pose un problème préoccupant qui nécessite une attention et une action immédiate de la part des autorités et des gestionnaires de l'Agence Nationale des Barrages et des Transferts (ANBT). De plus, diverses recherches sur les sédiments ont révélé que le fait de les soumettre à un traitement thermique (calcination) permet de les utiliser dans la production de matériaux cimentaires comme substitut partiel au ciment. Additionnés à la perlite, une pouzzolane naturelle, de nombreux avantages peuvent être obtenus, notamment une consommation de ciment réduite, une génération de chaleur minimisée, une maniabilité améliorée, une perméabilité réduite et une résistance accrue. Dans cette étude, l'objectif est d'explorer le potentiel d'utilisation des Les sédiments extraits du barrage Chorfa II ainsi que la perlite provenant de Hammam Boughrara (tous deux situés dans l’ouest algérien) dans le mortier, comme substituts partiels au ciment. Une analyse des sédiments calcinés et de la perlite a révélé la faisabilité d'un remplacement partiel du ciment. Les recherches se sont principalement concentrées sur l'évaluation des propriétés des mortiers à l’état frais et durci.

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Lensen, Jan. "De zoektocht naar het midden - Nieuwe perspectieven op de herinnering aan de Tweede Wereldoorlog in Vlaanderen en Duitsland". Internationale Neerlandistiek 52, n.º 2 (1 de maio de 2014): 113–33. http://dx.doi.org/10.5117/in2014.2.lens.

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This essay examines contemporary rewritings of World War II memory narratives. Drawing on the examples of Flughunde (1995) by German author Marcel Beyer and Marcel (1999) by Flemish author Erwin Mortier, I analyse the ways in which both authors address the complex processes of the transfer of guilt and perpetratorship from one generation to the next, which have marked public discourses in both national collectives in the aftermath of the war. This analysis shows how both authors challenge such habitual transfer, instead insisting on critical distance, empathic witnessing, and narrative integration. In this manner, they enable a fresh and productive approach of the past that moves beyond guilty silence, assignation of blame, or even calls for amnesty ‐ this stance notably sets them apart from previous writings on the war.

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Sellami, Farid, e Laetitia Borau. "Nature des matériaux et évolution de l’aqueduc de Grand-Font à Vesunna (Périgueux). Analyse micromorphologique du mortier et des dépôts carbonatés". Aquitania : une revue inter-régionale d'archéologie 34, n.º 1 (2018): 365–74. http://dx.doi.org/10.3406/aquit.2018.1570.

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Bolle, Clara. "The relation between nostalgia and vitalism in ‘Afscheid van Congo: met Jef Geeraerts terug naar de evenaar’ by Erwin Mortier". Afrika Focus 28, n.º 1 (26 de fevereiro de 2015): 103–8. http://dx.doi.org/10.1163/2031356x-02801007.

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This essay elaborates on my presentation on nostalgia and postcolonial literature, as presented at the 8th symposium of the Ghent Africa Platform held in autumn 2014. During this presentation I made a short analysis of how Svetlana Boym’s ideas on nostalgia, as expressed in her book Nostalgia for the Future, can be used to analyse Erwin Mortier’s memories of traveling, as noted in his book Afscheid van Congo: met Jef Geeraerts terug naar de evenaar (Goodbye to Congo: back to the equator with Jef Geeraerts). During my presentation I also introduced the relation between nostalgia and (aesthetic) vitalism. In this paper I will elaborate on the relation between nostalgia and vitalism as a phenomenon within (post)colonial literature.

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Danielsson, Kristina, Ewa Bergh Nestlog, Fredrik Jeppsson e Kok-Sing Tang. "Analysing Interaction in Science Classrooms". Educare, n.º 1 (22 de fevereiro de 2023): 1–32. http://dx.doi.org/10.24834/educare.2023.1.752.

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One central issue for research in classrooms is to provide insights concerning characteristics of classroom interaction that can help teachers improve their teaching. In the present study, we analyse spoken interaction in one elementary physics classroom by the use of two different frameworks, targeting similar aspects of social communication, namely how discourse patterns shape the relations between participants. The two frameworks utilized are on the one hand analyses of the communicative approach according to Mortimer and Scott, combined with analyses of discourse patterns such as IRE-patterns, and on the other hand analyses related to the interpersonal meta-function in Halliday’s systemic-functional grammar, SFG. The aim was to highlight possibilities and limitations of the different frameworks. Our analyses reveal that the two analytical frameworks have partly the same, partly different affordances concerning what they can reveal about classroom interaction. The analyses of the communicative approaches have the potential of elucidating discursive patterns and power relations at a general level, while the analyses based on SFG can provide more details about the power relations in terms of how the participants actually structure their utterances. The results are also discussed regarding implications for education.

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Brownsword, Roger, e John Hines. "The Alloys of a Sample of Anglo-Saxon Great Square-Headed Brooches". Antiquaries Journal 73 (setembro de 1993): 1–10. http://dx.doi.org/10.1017/s000358150007164x.

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The Potential Importance of the detailed measurement and study of the proportions of different elements in metal alloys used for early Anglo-Saxon artefacts has been appreciated for several years now. Such analyses add, for instance, to the direct observations of early Anglo-Saxon metalworking practice that can be made, and have a contribution to make to attempts to construct absolute and relative chronologies. Two ranges of alloys in particular have been profitably studied: alloys predominantly of gold, of the late sixth and seventh centuries, in which a progressive decline in the gold content allows dating estimates to be made on the strength of the results of metallurgical analysis (Hawkes, Merrick and Metcalf 1966; cf. Brown and Schweizer 1973 for the application of such results), and the predominantly copper alloys that are characteristic of the diverse and plentiful range of artefacts—particularly dress-jewellery—found in Anglo-Saxon graves of the Migration Period, dating from the fifth century to some point in the second half of the sixth. Study of these copper alloys has been organized in terms of particular artefact-types—for instance studies by Peter Northover and Tania Dickinson of saucer brooches and by Catherine Mortimer of cruciform brooches (Mortimer 1990: the unpublished results of Northover and Dickinson's earlier work are reported in this thesis)—and in the form of comprehensive surveys of the material recovered from individual cemeteries, such as Spong Hill, Norfolk (Wardley in Hills, Penn and Rickett 1984, 38–40), Watchfield, Oxfordshire, and Lechlade, Gloucestershire (Mortimer, Pollard and Scull 1986; Mortimer 1988).

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Hajdarevic, Seid, Murco Obucina, Elmedin Mesic e Sandra Martinovic. "Strength and stiffness analyses of standard and double mortise and tenon joints". BioResources 15, n.º 4 (14 de setembro de 2020): 8249–67. http://dx.doi.org/10.15376/biores.15.4.8249-8267.

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This paper investigated the effect of the tenon length on the strength and stiffness of the standard mortise and tenon joints, as well of the double mortise and tenon joints, that were bonded by poly(vinyl acetate) (PVAc) and polyurethane (PU) glues. The strength was analyzed by measuring applied load and by calculating ultimate bending moment and bending moment at the proportional limit. Stiffness was evaluated by measuring displacement and by calculating the ratio of applied force and displacement along the force line. The results were compared with the data obtained by the simplified static expressions and numerical calculation of the orthotropic linear-elastic model. The results indicated that increasing tenon length increased the maximal moment and proportional moment of the both investigated joints types. The analytically calculated moments were increased more than the experimental values for both joint types, and they had generally lower values than the proportional moments for the standard tenon joints, as opposed to the double tenon joints. The Von Mises stress distribution showed characteristic zones of the maximum and increased stress values. These likewise were monitored in analytical calculations. The procedures could be successfully used to achieve approximate data of properties of loaded joints.

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Roux, S., F. Feugeas e A. Cornet. "Biodégradation des bétons : analyse des bétons et mortiers en contact avec une eau douce naturelle". Matériaux & Techniques 93 (2005): s.123—s.135. http://dx.doi.org/10.1051/mattech:2006011.

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Zhou, Nianqiang, Weixing Shi e Jiazeng Shang. "Seismic response of a light steel structure integrated building with steel mortise–tenon connections". Advances in Structural Engineering 22, n.º 5 (9 de novembro de 2018): 1225–37. http://dx.doi.org/10.1177/1369433218811533.

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Mortise–tenon joints play a crucial role in traditional timber structures to resist service and earthquake loading. In this work, the steel mortise–tenon connection from a traditional timber house was extracted and developed for a lightweight steel structure integrated building. This article presents a study on the dynamic performance of an integrated steel house with steel mortise–tenon connections. A shaking table test was conducted with a full-scale model and various excitation intensities. Various parameters, including the natural frequency, the equivalent stiffness of the structure, the structural damping ratio, the acceleration response and the displacement response, were analysed and discussed. In the test, the model frequencies decreased from 15.19 to less than 13.38 Hz, while the damping ratio increased by 32.6%. The test model survived all the input earthquake excitations (peak ground acceleration of up to 1.0 g) with only minor damage, indicating the good seismic resilience of the building. The test results demonstrate that the integrated house structure with steel mortise–tenon connections is a good solution for withstanding earthquakes. An integrated structure bounded by a steel mortise–tenon system with proper design typically exhibits good seismic behaviour and can resist earthquake under different seismic levels in practice.

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Huan, Junhong, Zemeng Sun, Xiaodong Guo, Tianyang Chu, Xiaoyi Zhou, Wei Wang e Yating Yang. "Study on the seismic performance of through-tenon joints with pullout tenon gaps between mortise and tenon shoulder". BioResources 19, n.º 1 (16 de novembro de 2023): 322–44. http://dx.doi.org/10.15376/biores.19.1.322-344.

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Through-tenon joints are widely used in ancient timber buildings. To study the influence of the gaps between mortise and tenon shoulder on the seismic performance of through-tenon joints, a 1:3.52 scaled model was constructed and used for low cyclic loading test. Finite element analysis was conducted to study the mechanical behavior of the through-tenon joint. The seismic performance parameters of the model such as moment-rotation hysteresis curves, envelope curves, degradation of rigidity, and energy dissipation capacity were compared. The analyses showed similar changing characteristics, which indicated that the finite element analysis results were reliable. Based on the results, 7 through-tenon joint finite element analysis models with different gaps between mortise and tenon shoulder were established. The seismic performance of each of the through-tenon joints with different gaps between mortise and tenon shoulder were studied. The moment-rotation hysteresis curve of the through-tenon joint had an obvious pinching effect, and the through-tenon joint had good rotational loading capacity and good deformation ability. The peak rotational loading capacity, initial stiffness, and energy dissipation capacity of the joint decreased, while the gap between mortise and tenon shoulder increased.

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Teses / dissertações sobre o assunto "Mortier – Analyse"

Elaqra, Hossam. "Etude de l'endommagement et du renforcement de composites à matrice cimentaire". Lyon, INSA, 2004. http://theses.insa-lyon.fr/publication/2004ISAL0031/these.pdf.

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Ce travail de thèse s'inscrit dans le cadre général des études sur l'élaboration et la caractérisation des composites à matrice cimentaire. Dans notre cas, nous avons choisi le béton comme composite à matrice cimentaire, ce dernier résulte du mélange de plusieurs éléments : ciment, eau, granulats, adjuvants et fibres. Mon travail se propose de mieux comprendre d'une part l'influence des rapports sable sur ciment (s/c) et eau sur ciment (e/c) sur la microstructure, les mécanismes de l'endommagement et le renforcement et d'autre part le rôle de l'interface pâte-granulat dans ce mélange. Pour atteindre ces objectifs, dans un premier temps des essais de traction et compression ont été effectués avec un suivi de l'activité acoustique. De plus, des analyses en tomographie X ont été réalisées afin d'identifier les mécanismes d'endommagement. Dans un deuxième temps des observations microscopiques ont été menées afin d'examiner les changements microstructuraux. Des mesures de porosités ainsi que des analyses thermogravimétriques ont été effectuées. Deux systèmes ont été conçus pour réaliser les tests mécaniques. Le premier est un système de traction direct, adapté aux conditions de l'étude, qui a été mis au point au cours de ce travail. Ce système consiste en plusieurs articulations pour faciliter l'alignement de l'éprouvette lors de l'essai. Un second système pour effectuer les essais en compression a été réalisé. Pour ce dernier nous avons utilisé une calotte sphérique afin d'optimiser les défauts de parallélisme de deux surfaces de l'éprouvette
This PhD work comes within the scope of the study of the elaboration and characterisation of cement-based materials. In our case, we have chosen concrete as cement-based material. Concrete is the result of mixing cement, water, aggregate, adjuvant and fibres. I have tried to understand on the one hand, the influence of the sand to cement ratio and of the water to cement ratio on the microstructure and damage mechanisms, and on the other hand, the role of the interface aggregate-cement paste in the mixture. To achieve this, we have first done tensile and compression tests, while monitoring the acoustic emission and the tomography X, in order to identify the damage and reinforcement mechanisms. We have then done microscopic observations so as to examine the microstructure changes. We have also measured the porosity and done thermogravimetric analyses. Two systems were developed for these mechanical tests. One is a direct traction system, fitted to the conditions of the study and it was designed during this work. It consists of several articulations to facilitate the alignment of the specimen during the testing. The second system allows carrying out compression tests. We have used the segment of a sphere in order to optimise the parallelism defects of two surfaces of the specimen

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Elaqra, Hossam Fantozzi Gilbert. "Etude de l'endommagement et du renforcement de composites à matrice cimentaire". Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=elaqra.

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Moustachi, Om Elkhaïat. "Influence de la microstructure des mortiers de ciment portland armes de fibres sur leur comportement mecanique en flexion". Toulouse, INSA, 1986. http://www.theses.fr/1986ISAT0002.

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Analyse des modifications de la structure interne du mortier induites par l'introduction des fibres et determination de leur influence sur les proprietes mecaniques du mortier en flexion. Des fiches en paquets introduites dans le mortier se dispersent lors du malaxage en fibres individuelles espacees de quelques microns. Ces espaces, tres peu accessibles aux particules anhydres du ciment sont partiellement remplis par des hydrates. Ils rendent le mortier tres permeable aux fluides et influent directement sur son module d'elasticite en flexion qui diminue avec le pourcentage de fibres. L'effet d'armature des fibres se traduit par une augmentation de la resistance et de l'allongement a la rupture du mortier. De la fumee de silice dispersee a l'aide d'un fluidifiant reduit la porosite entre les fibres et augmente ainsi le module d'elasticite et sa resistance a la rupture

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El, boukhari Mohamed. "« Analyse expérimentale du comportement mécanique et thermiqued'un béton et d'un mortier allégés par des grignons d'olives : Application au bâtiment »". Electronic Thesis or Diss., Reims, 2023. http://www.theses.fr/2023REIMS040.

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La gestion des déchets agricoles et la promotion de matériaux de construction durables offrent de nombreux avantages considérables. En intégrant des pratiques durables dans le secteur de la construction, nous avons la capacité de réduire notre empreinte écologique en limitant l'exploitation excessive des ressources naturelles.La recherche menée dans la présente étude vise à développer un béton et un mortier de ciment structurels allégés avec des agrégats organiques de grignons d’olive. Deux types d’agrégats ont été utilisés selon qu’ils soient mélangés ou non avec des margines. L'objectif principal de cette étude est l’évaluation expérimentale des propriétés mécaniques et thermiques des éprouvettes de béton et de mortier allégés par rapport aux éprouvettes de béton et de mortier ordinaires. Elles ont été préparées en utilisant des agrégats des grignons d’olive à l’état sec et saturé, avec un pourcentage de substitution de sable naturel variant de 0% à 15%. Les résultats ont montré que la formulation optimale pour la production d’un béton allégé consiste en 5% d’agrégats de grignons d’olive à l’état sec et mélangés avec les margines. Cette formulation, offre de meilleures propriétés mécanique, notamment une résistance à la compression de 25 MPa, une résistance à la traction de 4,61 MPa et un module d'élasticité dynamique de 44,39 GPa. En plus, le matériau réalisé présente une masse volumique sèche réduite entraînant une diminution d’environ 5,69% par rapport au béton de référence.Pour le mortier de ciment, les meilleurs résultats ont été obtenus avec un mélange contenant 5% d’agrégats de grignons d’olive à l’état sec et mélangés avec les margines. Les résultats ont montré un effet marginal sur la résistance à la compression (Rc), atteignant 33,50 MPa, et ce après 28 jours de durcissement. Cependant, pour le béton et le mortier, l'analyse microstructurale a révélé une faible adhérence entre les agrégats de grignons d’olive et la matrice cimentaire au niveau de la Zone de Transition Interfaciale. Les tests expérimentaux ont montré également que l'augmentation de la teneur en agrégats de grignons d'olive réduit la vitesse de propagation des ultrasons et le module d'élasticité dynamique du béton et du mortier allégé ainsi que leur maniabilité tout en augmentant leur porosité.En ce qui concerne les propriétés thermiques des matériaux élaborés, l'incorporation d'agrégats de grignons d'olive a entraîné une amélioration de la résistance thermique. Dans le cas du béton allégé avec 5% d’agrégats de grignons d’olive à l’état sec et mélangés avec les margines, la conductivité thermique (λ) est passée de 1,3 W/m.K (pour l’éprouvette témoin) à 0,86 W/m.K. Dans le cas du mortier de ciment contenant 5% d’agrégats de grignons d’olive à l’état sec et mélangés avec les margines, la conductivité thermique (λ) est passée de 1,1 W/m.K (éprouvette témoin) à 0,87 W/m.K.En conclusion, cette étude a révélé que les matériaux élaborés et testés dans les conditions de laboratoires répondent aux normes requises pour une utilisation générale dans le bâtiment
The management of agricultural waste and the promotion of sustainable building materials offer many considerable benefits. By integrating sustainable practices into the construction sector, we have the ability to reduce our ecological footprint by limiting the excessive exploitation of natural resources. The research conducted in this study aims to develop a lightweight structural concrete and cement mortar using organic olive pomace aggregates. Two types of aggregates were used, depending on whether they were mixed with or without olive mill wastewater. The main objective of this study is to experimentally evaluate the mechanical and thermal properties of lightened concrete and mortar specimens in comparison with ordinary concrete and mortar specimens. They were prepared using dry and saturated olive pomace aggregates, with a percentage substitution of natural sand ranging from 0% to 15%. The results showed that the optimal formulation for producing lightweight concrete consists of 5% dry olive pomace aggregates mixed with olive mill wastewater. This formulation offers better mechanical properties, including a compressive strength of 25 MPa, a tensile strength of 4.61 MPa, and a dynamic modulus of elasticity of 44.39 GPa. Additionally, the resulting material has a reduced dry bulk density, leading to a decrease of approximately 5.69% compared to the reference concrete. For cement mortar, the best results were obtained with a mixture containing 5% dry olive pomace aggregates mixed with olive mill wastewater. The results showed a marginal effect on compressive strength (Rc), reaching 33.50 MPa after 28 days of curing. However, for both concrete and mortar, microstructural analysis revealed weak adhesion between olive pomace aggregates and the cement matrix at the Interfacial Transition Zone. Experimental tests also showed that increasing the content of olive pomace aggregates reduces the ultrasound propagation velocity and the dynamic modulus of elasticity of lightweight concrete and mortar, as well as their workability, while increasing their porosity.As regards the thermal properties of the developed materials, the incorporation of olive pomace aggregates led to an improvement in thermal resistance. In the case of lightweight concrete with 5% of dry olive pomace aggregates mixed with olive mill wastewater, the thermal conductivity (λ) decreased from 1.3 W/m·K (for the control specimen) to 0.86 W/m·K. In the case of cement mortar containing 5% of dry olive pomace aggregates mixed with olive mill wastewater, the thermal conductivity (λ) decreased from 1.1 W/m·K (control specimen) to 0.87 W/m·K. In conclusion, this study revealed that the materials developed and tested under laboratory conditions meet the required standards for general use in construction

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Rougelot, Thomas. "Étude expérimentale multi-échelles des couplages hydriques, mécaniques et chimiques dans les matériaux cimentaires". Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10115/document.

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Les couplages hydro-mécaniques et chimiques des matériaux cimentaires revêtent une grande importance pour la durabilité d'un ouvrage soumis à des sollicitations complexes, tel que le stockage souterrain de déchets nucléaires. Les travaux présentés se focalisent sur des mortiers et des pâtes de ciment à deux rapports eau sur ciment. Les couplages entre des sollicitations hydriques par séchage, des sollicitations hydro-chimiques par lixiviation, et le comportement mécanique du matériau notamment d'un point de vue de l'endommagement et des variations dimensionnelles, sont traités. En outre, l'approche expérimentale s'attache à caractériser les phénomènes physiques à plusieurs échelles. Microscopiquement, la caractérisation du réseau poreux des matériaux est réalisée par isothermes de désorption et d'intrusion mercure. Puis une étude 4D des liens entre lixiviation et fissuration est menée par microtomographie par rayons X (résolution: 5 µm). L'effet du retrait empêché par déformations différentielles entre granulats et matrice cimentaire est mis en évidence dans l'apparition de la fissuration. En outre, la présence d'une préfissuration accélère la dégradation. Macroscopiquement, le retrait lié au séchage lent de matériaux a été quantifié et modélisé par approche poromécanique. De plus, une microfissuration, répartie au sein du matériau, engendre plus de perturbations sur la désorption que quelques macrofissures localisées. Enfin, la résistance en traction par fendage est modifiée par le séchage, par une compétition entre le confinement de l'éprouvette, la fissuration induite et les granulats. Le comportement en traction directe a fait l'objet d'études préliminaires
To determine the hydro-mechanical and chemical behaviour in cementitious materials is a key point to predict the durability of a structure submitted to complex stresses, such as the radioactive waste underground disposaI. This work is performed on mortars and cement pastes, with two distinct water-to-cement ratios. Coupling between hydric stresses by drying, hydro-chemical effect of calcium leaching, and the mechanical behaviour of the material, with a focus put on damage and strains evolution, are studied. Moreover, the experimental approach tries to characterize the physical phenomenons with a multi-scale view. From microscopic aspects, the characterization of the porous network is obtained by means of desorption isotherms and mercury intrusion. The influence of the W/C ratio is highlighted. Then, in a 4D approach of coupling effects between calcium leaching and cracking is conducted with X-ray microtomography (resolution: 5 µm). The restrained shrinkage due to differential strains in aggregates and cementitious matrix is shown as the cause of microcracking. ln addition, a pre-cracking increases the chemical degradation of the material. From macroscopic aspects, the shrinkage due to a smooth drying is experimentally determined, and a poromechanical model is then proposed. The diffuse microcracking effects appear to have more importance on the desorption than several localized macrocracks. Finally, the decrease in the saturation of the material modifies the splitting tensile strength. This could be due to a competitive effect between shrinkage, stresses and the influence of the aggregates in the cracking energy. Some preliminary tests are also conducted in direct tension

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Ramoda, Salem. "Contribution a l'etude de l'influence de la composition des mortiers sur leur resistance a la propagation de fissures". Toulouse, INSA, 1987. http://www.theses.fr/1987ISAT0006.

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Etude de la propagation en mode 1 dans les mortiers a base de liant hydraulique, en analysant specialement le role de la liaison granulats-pate. Influence de la concentration en liant dans la matrice, des proportions matrice-granulats, de la nature du liant, de divers types d'ajouts et des conditions de cure

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Pham, Son Tung. "Etude des effets de la carbonatation sur les propriétés microstructurales et macroscopiques des mortiers de ciment Portland". Thesis, Rennes, INSA, 2014. http://www.theses.fr/2014ISAR0003.

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La carbonatation est l’un des processus initiateurs de la corrosion des armatures du béton armé. Sa cinétique est souvent utilisée pour modéliser la durabilité des ouvrages. La carbonatation résulte de la réaction en présence d’eau entre le dioxyde de carbone contenu dans l’air et les phases hydratées de la pâte de ciment. Elle donne du carbonate de calcium et provoque une baisse du pH qui induit la dépassivation des armatures et leur corrosion. La carbonatation des matériaux à base de ciment a été largement étudiée ces dernières années mais les données de la littérature sont extrêmement contradictoires sur la plupart des évolutions qu’elle engendre tant au niveau microstructural qu’à l’échelle macroscopique. Notre travail a eu pour objectif d’étudier les conséquences microscopiques et macroscopiques de la carbonatation sur deux mortiers standards simples à base de ciment CEM I et CEM II. Nous avons mené une étude expérimentale approfondie sur deux mortiers normalisés à base de ciment CEM I et CEM II pour comprendre les mécanismes physico-chimiques de la carbonatation. Nous avons utilisé les techniques suivantes pour examiner les conséquences de la carbonatation sur les caractéristiques microstructurales de la matrice cimentaire : analyse thermogravimétrique, diffraction de rayons X, pycnométrie à l’hélium, adsorption – désorption d’azote et de vapeur d’eau. Comme ces modifications observées au niveau de la microstructure induisent à leur tour des évolutions significatives au niveau des propriétés macroscopiques d’usage et des indicateurs de durabilité, nous avons examiné les conséquences de la carbonatation sur la perméabilité au gaz, la vitesse de propagation des ondes ultrasonores, la conductivité thermique et la résistivité électrique de surface. Notre étude a également porté sur la contribution de la carbonatation à la cicatrisation des mortiers endommagés thermiquement. Enfin, nos résultats expérimentaux ont été utilisés comme base de données pour élaborer un modèle sur la propagation de CO2 dans la matrice cimentaire
Carbonation is one of the most important factors that initiate the corrosion of steel bars in reinforced concrete. Its kinetics are often used to model the durability of structures. Under the action of carbon dioxide from the air and with the presence of water in the pores, several hydrated phases of the cement paste are carbonated and form calcium carbonate. This process causes a decrease in pH of the pore water, which subsequently induces the depassivation and corrosion of the rebars. Although the carbonation of cementitious materials has been extensively studied in recent years, results in literature about changes in both micro and macroscopic levels are extremely contradictory. The aim of this work is to study the micro and macroscopic effects of carbonation on two standard cement mortars CEM I and CEM II. A wide experimental campaign was conducted on two standard mortars CEM I and CEM II in order to apprehend the physicochemical mechanisms of the carbonation. The following techniques were used to examine the impacts of carbonation on the microstructural characteristics of the cementitious matrix : thermogravimetric analysis, X-ray diffraction, helium pycnometry, nitrogen and water vapor adsorption-desorption. As changes observed in the microstructure could consequently induce significant modifications in the macroscopic properties and the sustainability indicators, we examined the effects of carbonation on the gas permeability, the ultrasonic waves velocity, the thermal conductivity and electrical resistivity. Our work also studied the self-healing effect caused by carbonation of thermally damaged mortars. Finally, our experimental results were used as a database to elaborate a model of the propagation of CO2 in the cementitious matrix

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Cappelin, Isabelle. "Synthèse de liants pouzzolaniques : application au traitement des sols fins argileux". Toulouse 3, 1992. http://www.theses.fr/1992TOU30280.

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Notre travail a porte sur l'etude de la stabilisation d'un sol fin argileux a l'aide de liants hydrauliques a base d'argile et de chaux. Nous avons selectionne quatre materiaux: deux argiles quasi monominerales: une kaolinite et une montmorillonite et deux produits tout-venant: une laterite de madagascar riche en kaolinite et une molasse du sud-ouest de la france composee de smectite associee a de faibles quantites d'illite, de kaolinite et de chlorite. La premiere partie est consacree a l'etude de l'hydratation en presence de chaux des materiaux calcines en lit fixe dans un domaine de temperature compris entre 600 et 900c. Les techniques physico-chimiques nous ont aide a preciser l'etat des materiaux avant et apres calcination. Les essais mecaniques realises sur des microeprouvettes nous ont permis: - d'optimiser la temperature de calcination des produits et la quantite d'activateur chimique des melanges; - de determiner l'influence de la duree de calcination, de la teneur en eau de gachage et du mode de conservation des eprouvettes. Dans la deuxieme partie, les quatre liants optimises ont ete testes en traitement des sols fins. Nous avons compare, en faisant varier certains parametres, les resistances mecaniques a celles obtenues avec un traitement au ciment ou a la chaux generalement utilise pour la stabilisation des sols argileux. Les resultats obtenus avec la kaolinite sont du meme ordre de grandeur que ceux induits par un traitement au ciment

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Chouicha, Kaddour. "Evolution microstructurale des micro-betons soumis a des chargements cycliques de faible frequence". Toulouse, INSA, 1986. http://www.theses.fr/1986ISAT0026.

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L'etude de l'evolution de la structure de micro-betons soumis a des changements cycliques de faible frequence permet de souligner qu'a des taux de chargements inferieurs a 50 % de la charge de rupture, l'evolution microstructurale se traduit par un deplacement d'eau lie a un retrecissement des pores couple eventuellement a quelques micro-ruptures dans les interfaces pate de ciment-granulat. Pour des taux de chargement plus eleves, il y a simultanement ecrasement des pores et croissance des microfissures aux interfaces, croissance qui conduirait a la rupture pour un grand nombre de cyclos.

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Carpio, Pérez Juan-José. "Étude de la dépassivation et de la repassivation des armatures métalliques dans les bétons". Compiègne, 1991. http://www.theses.fr/1991COMPA339.

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La première partie de l'étude concerne la dépassivation des armatures en acier dans des mortiers. La dépassivation est due au dioxyde de carbone et aux chlorures venant du milieu environnant et traversant l'enrobage de béton. Les résultats ont montré que le processus de pénétration des chlorures peut être décrit par la loi de diffusion de Fick. Il est influencé par la teneur en dioxyde de carbone dans le mortier d'enrobage. La dépassivation (amorçage de la corrosion) se produit quand la teneur en chlorure (CL) dans l'enrobage au contact de l'acier, est égale à la teneur en hydroxyle (OH) ou à 0,6 OH (la dispersion de cette teneur critique (CL) est en accord avec celle des mesures de pH). La deuxième partie de cette étude concerne la repassivation des armatures enrobées de mortier, obtenue par polarisation cathodique. Le comportement de l'interface de l'acier est étudié par essais électrochimiques qui sont la spectrométrie d'impédance électrochimique, la mesure de résistance de polarisation et un nouvel essai appelé « saut de courant » (SDC). Les paramètres déterminés par l'essai SDC sont des résistances et des capacités qui sont très semblables à ceux qui sont obtenus par les essais électrochimiques classiques.

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Mais fontes

Livros sobre o assunto "Mortier – Analyse"

Pecchioni, Elena. Atlante delle malte antiche in sezione sottile al microscopio ottico: Atlas of the ancient mortars in thin section under optical microscope. Firenze: Nardini editore, 2014.

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Pecchioni, Elena. Le malte antiche e moderne: Tra tradizione ed innovazione. Bologna: Pàtron, 2008.

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International RILEM Workshop on Historic Mortars: Characteristics and Tests (1999 Paisley, Scotland). International RILEM Workshop on Historic Mortars, Characteristics and Tests: Paisley, Scotland, 12th-14th May 1999. Cachan, France: RILEM Publications, 2000.

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Theryo, Teddy S. Guidelines for sampling, assessing, and restoring defective grout in prestressed concrete bridge post-tensioning ducts. McLean, VA: U.S. Department of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner-Fairbank Highway Research Center, 2013.

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Paternoster, Giovanni. Malte e tecniche edilizie del rione Terra di Pozzuoli: L'età romana. [Napoli]: Giannini, 2007.

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Guido, Biscontin, ed. Compatible materials for the protection of European cultural heritage. [Strasbourg: Council of Europe, 1998.

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Lowe, Judith A. Mortimer-Filkins, blood alcohol content, and self-report. 1989.

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McClune, Kate. ‘He was but a Yong Man’. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787525.003.0006.

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This chapter analyses the presentation of the figure of King Arthur in a selection of Scots chronicles and romances. It considers Scots ambivalence towards the figure of Arthur, and examines this against the perennial Scots concern with the problem of youthful kingship. In doing so, it highlights a hitherto neglected aspect in the equivocal Scottish treatments of Arthur: the issue of age. It argues that the varied nature of Arthur’s characterization is related to the extreme youth of the true heir (in Scots tradition at least), Modred, and a corresponding anxiety about minority rule which reflects contemporary Scots concerns. It concludes with an analysis of Malory’s Morte Darthur and points to hitherto unnoticed parallels in the English tradition.

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Urquízar-Herrera, Antonio. The Foundations of an Antiquarian Literature for Islamic Architecture. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198797456.003.0006.

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Chapter 5 explores the codification of antiquarian writing in Spain in its original form as expressed by Ambrosio de Morales in Las Antigüedades de las ciudades de España (1575), and particularly it considers the consequences of the inclusion of Córdoba Mosque and Madinat al-Zahra in this commentary. The terms of the description and Morales’ use of antiquarian tools are analyzed. In addition, the chapter deals with the interesting methodological debate Morales’ writings gave rise (Pedro Díaz de Ribas, Gregorio López Madera, Alonso Morgado, among others) to around the use of antiquarian tools in formal historical research of Islamic monuments: literary sources, epigraphy, and archaeological analyses of the materials and building techniques (stones, bricks, and mortar). Finally, the chapter deals with the conflictive relationship between the narratives on the Islamic antiquities of Spain, the antiquarian vocabulary and the classical canon.

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López Quiroga, Jorge, e Luis Ríos Frutos, eds. Bioarchaeology of Injuries and Violence in Early Medieval Europe. BAR Publishing, 2022. http://dx.doi.org/10.30861/9781407359939.

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Bioarchaeology of Injuries and Violence in Early Medieval Europe presents evidence and documents forms of violence and injuries in skeletal remains. Its contributions address this topic for the first time in a chronologically specific arc (Late Antiquity and Early Middle Ages) and a wide geographical area (Greece, England, Germany, France, Italy and Spain). The diversity of examples of interpersonal violence, collective violence (mass graves), punishments, and ante-mortem and post-mortem injuries provides an important data set concerning the degree and dimension of violence and injuries in post-Roman Europe. Osteoarchaeological and bioarchaeological analysis of human remains, together with exhaustive studies of corpses, from the time of burial to exhumation, makes it possible to identify burials as ‘non-normative', ‘anomalous’ or ‘deviant’ burials that may be the result of violence, including evidence of punishments and executions.

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Capítulos de livros sobre o assunto "Mortier – Analyse"

Andresen, Judith. "Post-Mortem-Analyse". In Retrospektiven in agilen Projekten, 69–76. München: Carl Hanser Verlag GmbH & Co. KG, 2013. http://dx.doi.org/10.3139/9783446439320.006.

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Andresen, Judith. "Post-Mortem-Analyse". In Retrospektiven in agilen Projekten, 83–91. München: Carl Hanser Verlag GmbH & Co. KG, 2017. http://dx.doi.org/10.3139/9783446452626.006.

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Irfan, Mohammed. "AI in Post-Mortem Analysis". In Artificial Intelligence in Forensic Science, 65–78. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.4324/9781003287810-5.

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Andresen, Judith. "Retrospektiven und Post-Mortem-Analysen moderieren". In Retrospektiven in agilen Projekten, 61–81. München: Carl Hanser Verlag GmbH & Co. KG, 2017. http://dx.doi.org/10.3139/9783446452626.005.

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Cattaneo, Cristina, Annalisa Cappella e Eugenia Cunha. "Post Mortem Anthropology and Trauma Analysis". In P5 Medicine and Justice, 166–79. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67092-8_11.

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Gong, Xu, Hongfa Yu e Chengyou Wu. "Study on Deterioration Rule of Water-Binder Ratio on Mechanical Properties and Frost Resistance of Concrete". In Lecture Notes in Civil Engineering, 462–73. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_42.

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AbstractBased on the rapid freeze-thaw (F-T) cycle test, the changes of relevant indexes (mass, relative dynamic elastic modulus, mechanical properties and thickness of concrete F-T damage layer) of concrete and mortar specimens with three water-binder ratios under F-T cycle was systematically studied. The results show that the quality, relative dynamic elastic modulus and mechanical properties of concrete and mortar decrease with the increase of F-T cycles, the thickness of F-T damaged layer of concrete increases in different degrees. The degree of F-T damage of mortar specimen is obviously lower than that of concrete specimen. Through regression analysis, it is find that the relative dynamic elastic modulus of concrete were significantly related to the relative dynamic elastic modulus of mortar, the thickness of concrete damage layer and the relative dynamic elastic modulus of concrete, it shows that one of the factors causing the F-T damage of concrete is the damage of mortar.

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Hesch, Christian, Ustim Khristenko, Rolf Krause, Alexander Popp, Alexander Seitz, Wolfgang Wall e Barbara Wohlmuth. "Frontiers in Mortar Methods for Isogeometric Analysis". In Non-standard Discretisation Methods in Solid Mechanics, 405–47. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92672-4_15.

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Dzincic, Igor. "A FEM Analysis of Mortise and Tenon Joint Within Chairs". In Current Problems in Experimental and Computational Engineering, 1–17. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86009-7_1.

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Hamilton, Stuart J., e Michael A. Green. "Gross Post-Mortem Changes in the Human Body". In Taphonomy of Human Remains: Forensic Analysis of the Dead and the Depositional Environment, 9–25. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118953358.ch1.

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Simmons, Tal. "Post-Mortem Interval Estimation: an Overview of Techniques". In Taphonomy of Human Remains: Forensic Analysis of the Dead and the Depositional Environment, 134–42. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118953358.ch10.

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Trabalhos de conferências sobre o assunto "Mortier – Analyse"

Yu, Yue, Lifang Qiu, Decheng Wang e Jing Zou. "Design and Analysis of Flexible Continuum Robot Based on Origami and Mortise-Tenon Structure (FCRBOM)". In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-68169.

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Abstract The continuum robot is a soft robot with infinite degrees of freedom. Origami has a high capacity for spatial deployment. This paper proposes a flexible continuum robot based on origami and mortise-tenon structure (FCRBOM). The robot consists of some flexible hinges based on origami and mortise-tenon structure (FHBOM). The design process of the FCRBOM is given. The compliance of the FCRBOM is analyzed by the compliance matrix method. The Finite element analysis (FEA) is used to simulate and analyze the FCRBOM, and the correctness of the theoretical analysis is verified. Then a spatial FCRBOM (SFCRBOM) is designed. The impact of key dimensional parameters on the flexibility of SFCRBOM is discussed. Finally, an SFCRBOM with higher flexibility is presented.

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Yi Zhang e S. P. Iyer. "Error Report Driven Post-Mortem Analysis". In 15th IEEE International Conference on Program Comprehension (ICPC '07). IEEE, 2007. http://dx.doi.org/10.1109/icpc.2007.43.

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Huang, Hsing-Hui, Hong-Sen Yan e Yi-Ming Lin. "The Design of New Type Multipoint Mortise Locks". In ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/detc2008-49337.

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Locks are important safety devices in our daily lives. The purpose of this study is to design new mechanisms of multipoint mortise locks based on a systematic approach. Firstly, the classification and advantages of mechanical locks are introduced, and the definitions and the development of mortise locks are described. Then, the multipoint mortise locks are decomposed into four sub-parts by the different functions, including the latch bolt lock, the dead bolt lock, the dead-latch bolt lock, and the connecting mechanism. The four sub-parts are further analyzed to conclude their structural characteristics as well as design requirements and constraints. Based on Yan’s creative mechanism design methodology, the concepts and the atlas of designs are synthesized systematically. One feasible mechanism is further chosen for detail design. Finally, a computer program for simulation is developed and prototypes are built for verifying the design results. The results of this study provide a valuable reference for designing multipoint mortise locks and for the analysis of mechanism characteristics of mortise locks.

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Ševčík, Radek, Irena Adámková, Michal Vopálenský e Alberto Viani. "The visualization of microcracks in aged cement mortar using tomography". In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS: ICNAAM2022. AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0210372.

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Alzamora, Pedro Loures, Marcelo Sartori Locatelli, Marcelo Ganem, Thiago Henrique Moreira Santos, Daniel Victor Ferreira, Tereza Bernardes, Ramon A. S. Franco et al. "A COVID-19 no Twitter: correlacionando vocabulário com agravamento e atenuação da pandemia no Brasil". In Brazilian Workshop on Social Network Analysis and Mining. Sociedade Brasileira de Computação - SBC, 2022. http://dx.doi.org/10.5753/brasnam.2022.223330.

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O presente estudo busca caracterizar o primeiro ano da pandemia de COVID-19 no Brasil como um fenômeno social por meio da análise da correlação entre o agravamento/atenuação da pandemia e o vocabulário utilizado no Twitter nas semanas que precedem essas variações. Entre outros resultados, observou-se que termos politicamente motivados e com teor negativo são mais prevalentes nas semanas que precedem o aumento do número de casos/mortes, ao passo que o uso de termos relacionados a conteúdos midiáticos (internet, música, televisão) é intensificado nas semanas que antecedem a queda da quantidade de casos/mortes. Tais resultados sugerem a possibilidade de utilização do método aqui introduzido para a análise de fenômenos sociais a partir de dados computacionalmente leves e totalmente anonimizados provenientes de redes sociais online.

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Erdogmus, E., M. Turan, J. Freedland, A. Gaggioli e M. Hoff. "Characterization of Historic Mortar Samples and Period Analysis: A Case Study". In 12th International Conference on Structural Analysis of Historical Constructions. CIMNE, 2021. http://dx.doi.org/10.23967/sahc.2021.046.

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Gattesco, N., e I. Boem. "Cyclic Tests on Thin Masonry Vaults Strengthened Through Composite Reinforced Mortar". In 12th International Conference on Structural Analysis of Historical Constructions. CIMNE, 2021. http://dx.doi.org/10.23967/sahc.2021.066.

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Scali, Mauro, Paul Scheiner, Wilkins Aquino, Rasko Ojdrovic e Mehdi Zarghamee. "Analysis and Performance of PCCP Mortar Coating". In Pipeline Engineering and Construction International Conference 2003. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40690(2003)115.

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Harbaugh, Sam, e Greg Saunders. "GKS/Ada post mortem, a cost analysis". In the 1987 annual ACM SIGAda international conference. New York, New York, USA: ACM Press, 1987. http://dx.doi.org/10.1145/317500.317502.

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Volskis, Héctor, Bruna Loiola, Francesco Scofano Neto e Rodrigo Guedes. "NUMERICAL THERMAL ANALYSIS OF AN 81MM MORTAR". In 19th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2022. http://dx.doi.org/10.26678/abcm.encit2022.cit22-0399.

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Relatórios de organizações sobre o assunto "Mortier – Analyse"

Condon, John A., e Michael S. Hollis. Dynamic Analyses of the Mortar Dragster Tab Mechanism. Fort Belvoir, VA: Defense Technical Information Center, abril de 1998. http://dx.doi.org/10.21236/ada345815.

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Jablonski, J., J. A. Cordes, M. Hespos, D. Geissler e M. Carlini. Critical Flaw Estimate and Flaw Analysis of 81-mm M821A1 Mortar Projectile. Fort Belvoir, VA: Defense Technical Information Center, junho de 2010. http://dx.doi.org/10.21236/ada526509.

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Contreras, Jorge, Bronwyn Hall e Christian Helmers. Green Technology Diffusion: A Post-Mortem Analysis of the Eco-Patent Commons. Cambridge, MA: National Bureau of Economic Research, novembro de 2018. http://dx.doi.org/10.3386/w25271.

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Lau, D. L., e L. C. Ng. Analysis of total least squares in estimating the parameters of a mortar trajectory. Office of Scientific and Technical Information (OSTI), dezembro de 1994. http://dx.doi.org/10.2172/96640.

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Bigl, Matthew, Samuel Beal e Charles Ramsey. Determination of residual low-order detonation particle characteristics from IMX-104 mortar rounds. Engineer Research and Development Center (U.S.), setembro de 2021. http://dx.doi.org/10.21079/11681/42163.

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The environmental fate and transport of energetic compounds on military training ranges are largely controlled by the particle characteristics of low-order detonations. This study demonstrated a method of command detonation, field sampling, laboratory processing, and analysis techniques for characterizing low-order detonation particles from 60 mm and 81 mm mortar rounds containing the insensitive munition formulation IMX-104. Particles deposited from three rounds of each caliber were comprehensively sampled and characterized for particle size, energetic purity, and morphology. The 60 mm rounds were command-detonated low order consistently (seven low-order detonations of seven tested rounds), with con-sumption efficiencies of 62%–80% (n = 3). The 81 mm rounds detonated low order inconsistently (three low-order detonations of ten tested rounds), possibly because the rounds were sourced from manufacturing test runs. These rounds had lower consumption efficiencies of 39%–64% (n = 3). Particle-size distributions showed significant variability between munition calibers, between rounds of the same caliber, and with distance from the detonation point. The study reviewed command-detonation configurations, particle transfer losses during sampling and particle-size analysis, and variations in the energetic purity of recovered particles. Overall, this study demonstrated the successful characterization of IMX-104 low-order detonation particles from command detonation to analysis.

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Clausen, Jay, Samuel Beal, Thomas Georgian, Kevin Gardner, Thomas Douglas e Ashley Mossell. Effects of milling on the metals analysis of soil samples containing metallic residues. Engineer Research and Development Center (U.S.), julho de 2021. http://dx.doi.org/10.21079/11681/41241.

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Metallic residues are distributed heterogeneously onto small-arms range soils from projectile fragmentation upon impact with a target or berm backstop. Incremental Sampling Methodology (ISM) can address the spatially heterogeneous contamination of surface soils on small-arms ranges, but representative kilogram-sized ISM subsamples are affected by the range of metallic residue particle sizes in the sample. This study compares the precision and concentrations of metals in a small-arms range soil sample processed by a puck mill, ring and puck mill, ball mill, and mortar and pestle prior to analysis. The ball mill, puck mill, and puck and ring mill produced acceptable relative standard deviations of less than 15% for the anthropogenic metals of interest (Lead (Pb), Antimony (Sb), Copper (Cu), and Zinc (Zn)), with the ball mill exhibiting the greatest precision for Pb, Cu, and Zn. Precision by mortar and pestle, without milling, was considerably higher (40% to >100%) for anthropogenic metals. Media anthropogenic metal concentrations varied by more than 40% between milling methods, with the greatest concentrations produced by the puck mill, followed by the puck and ring mill and then the ball mill. Metal concentrations were also dependent on milling time, with concentrations stabilizing for the puck mill by 300 s but still increasing for the ball mill over 20 h. Differences in metal concentrations were not directly related to the surface area of the milled sample. Overall, the tested milling methods were successful in producing reproducible data for soils containing metallic residues. However, the effects of milling type and time on concentrations require consideration in environmental investigations.

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Bigl, Matthew, Samuel Beal e Charles Ramsey. Determination of residual low-order detonation particle characteristics from Composition B mortar rounds. Engineer Research and Development Center (U.S.), agosto de 2022. http://dx.doi.org/10.21079/11681/45260.

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Empirical measurements of the spatial distribution, particle-size distribution, mass, morphology, and energetic composition of particles from low-order (LO) detonations are critical to accurately characterizing environ-mental impacts on military training ranges. This study demonstrated a method of generating and characterizing LO-detonation particles, previously applied to insensitive munitions, to 81 mm mortar rounds containing the conventional explosive formulation Composition B. The three sampled rounds had estimated detonation efficiencies ranging from 64% to 82% as measured by sampled residual energetic material. For all sampled rounds, energetic deposition rates were highest closer to the point of detonation; however, the mass per radial meter varied. The majority of particles (>60%), by mass, were <2 mm in size. However, the spatial distribution of the <2 mm particles from the point of detonation varied be-tween the three sampled rounds. In addition to the particle-size-distribution results, several method performance observations were made, including command-detonation configurations, sampling quality control, particle-shape influence on laser-diffraction particle-size analysis (LD-PSA), and energetic purity trends. Overall, this study demonstrated the successful characterization of Composition B LO-detonation particles from command detonation through combined analysis by LD-PSA and sieving.

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Bauer, Andrew. In situ and time. Engineer Research and Development Center (U.S.), dezembro de 2022. http://dx.doi.org/10.21079/11681/46162.

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Large-scale HPC simulations with their inherent I/O bottleneck have made in situ visualization an essential approach for data analysis, although the idea of in situ visualization dates back to the era of coprocessing in the 1990s. In situ coupling of analysis and visualization to a live simulation circumvents writing raw data to disk for post-mortem analysis -- an approach that is already inefficient for today's very large simulation codes. Instead, with in situ visualization, data abstracts are generated that provide a much higher level of expressiveness per byte. Therefore, more details can be computed and stored for later analysis, providing more insight than traditional methods. This workshop encouraged talks on methods and workflows that have been used for large-scale parallel visualization, with a particular focus on the in situ case.

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Ucak-Astarlioglu, Mine, Jedadiah Burroughs, Charles Weiss, Kyle Klaus, Stephen Murrell, Samuel Craig, Jameson Shannon, Robert Moser, Kevin Wyss e James Tour. Graphene in cementitious materials. Engineer Research and Development Center (U.S.), dezembro de 2023. http://dx.doi.org/10.21079/11681/48033.

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This project aims to determine the influence of laboratory-generated graphene (LGG) and commercial-grade graphene (CGG) on the chemical structure and compressive strength of graphene-cement mixtures. Determining the graphene-cement structure/processing/property relationships provides the most useful information for attaining the highest compressive strength. Graphene dose and particle size, speed of mixing, and dispersant agent were found to have important roles in graphene dispersion by affecting the adhesion forces between calcium silicate hydrate (CSH) gels and graphene surfaces that result in the enhanced strength of cement-graphene mixtures. X-ray diffraction (XRD), Raman, and scanning electron microscope (SEM) analyses were used to determine chemical microstructure, and compression testing for mechanical properties characterization, respectively. Based on observed results both LGG and CGG graphene cement mixtures showed an increase in the compressive strength over 7-, 14-, and 28-day age curing periods. Preliminary dispersion studies were performed to determine the most effective surfactant for graphene dispersion. Future studies will continue to research graphene—cement mortar and graphene—concrete composites using the most feasible graphene materials. These studies will prove invaluable for military programs, warfighter support, climate change, and civil works.

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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li e Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.

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