Готові списки джерел за темами / Mortier – Additifs

Добірка наукової літератури з теми "Mortier – Additifs"

Автор: Grafiati

Опубліковано: 7 липня 2024

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Статті в журналах з теми "Mortier – Additifs":

Castillo, Percy, Julián Salas, M. Isabel Sánchez de Rojas, and Janer Veras. "Empleo de cenizas de cáscara de arroz como adiciones en morteros." Materiales de Construcción 36, no. 203 (September 30, 1986): 21–39. http://dx.doi.org/10.3989/mc.1986.v36.i203.888.

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ŞİMŞEK, Nimet, and İsmail KILIÇ. "POLİPROPİLEN ELYAF KATKILI HORASAN HARCININ ÖZELLİKLERİNİN ARAŞTIRILMAS." Euroasia Journal of Mathematics, Engineering, Natural & Medical Sciences 8, no. 19 (December 26, 2021): 72–82. http://dx.doi.org/10.38065/euroasiaorg.911.

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Bu çalışma, tarihi eserlerde sıkça kullanılan horasan harcı üzerinde yapılmıştır. Horasan harcı üretiminde katkı olarak polipropilen elyaf kullanılmıştır. Harç karışımı, doğal hidrolik kireç, tuğla kırığı, standart kum, polipropilen elyaf ve su ile oluşturulmuştur. Karışımlarda, 0-2mm ve 0-4mm olmak üzere iki farklı boyutta tuğla kırığı kullanılmıştır. Ayrıca, polipropilen elyaf harçlara %0,2, %0,4, %0,6, %0,8 ve %1 oranlarında katılmış ve değişen katkı oranlarının, harçların özellikleri üzerindeki etkisi araştırılmıştır. Harç kalıbı kullanılarak, 40mmx40mmx160mm boyutlarında prizmatik horasan harcı örnekleri üretilmiştir. Üretilen, taze horasan harçları üzerinde yayılma deneyi, 28 ve 90 günlük prizmatik harç örnekleri üzerinde ise birim hacim ağırlık, su emme, ultrases geçiş süresi, eğilme dayanımı ve basınç dayanımı deneyleri yapılmıştır. Elde edilen verilere göre en yüksek dayanım değerlerine, 0-4mm boyutunda tuğla kırığı ile birlikte, %0,6 oranında polipropilen elyaf kullanılmasıyla ulaşılmıştır. Horasan harcı karışımında, 0-2mm boyutunda tuğla kırığı kullanılması durumunda ise %0,8 oranında polipropilen elyaf kullanılması gerektiği belirlenmiştir.

Silva, Diogo FM, Ivo MF Bragança, Carlos MA Silva, Luis M. Alves, and Paulo AF Martins. "Joining by forming of additive manufactured ‘mortise-and-tenon’ joints." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 233, no. 1 (July 27, 2017): 166–73. http://dx.doi.org/10.1177/0954405417720954.

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This article is aimed at extending the ‘mortise-and-tenon’ joining concept commonly utilized in corner or tee joints to lap joints in which one sheet is partially placed over another without any change in their shape. The approach makes use of wire arc additive manufacturing to fabricate the tenons and allows various shapes and thicknesses to be made from a wide range of metallic materials. Upset compression of the tenons is utilized to mechanically lock the two sheets being joined. Experimental and finite element simulation works performed with monolithic (aluminium–aluminium) and hybrid (aluminium–polymer) ‘unit cells’ consisting of a single lap joint are utilized to investigate the deformation mechanics and the feasibility of the new proposed joining process. Tensile-shear loading tests were carried out to determine the maximum force that the new proposed joints are capable to withstand without failure. Pull-out forces of approximately 8 and 6 kN for the monolithic and hybrid joints allow concluding on the potential of additive manufactured ‘mortise-and-tenon’ lap joints to connect sheets made from similar and dissimilar materials.

Lawrence, Philippe, and Erick Ringot. "Prise en compte des additions minérales dans le calcul des résistances de mortiers." Revue Française de Génie Civil 4, no. 4 (January 2000): 525–42. http://dx.doi.org/10.1080/12795119.2000.9692285.

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LaMothe, Jeremy M., Josh R. Baxter, Sydney C. Karnovsky, Conor I. Murphy, Susannah Gilbert, and Mark C. Drakos. "Syndesmotic Injury Assessment With Lateral Imaging During Stress Testing in a Cadaveric Model." Foot & Ankle International 39, no. 4 (December 21, 2017): 479–84. http://dx.doi.org/10.1177/1071100717745660.

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Background: External rotation, lateral, and sagittal stress tests are commonly used to diagnose syndesmotic injuries, but their efficacy remains unclear. The purpose of this study was to characterize applied stresses with fibular motion throughout the syndesmotic injury spectrum. We hypothesized that sagittal fibular motion would have greater fidelity in detecting changes in syndesmotic status compared to mortise imaging. Methods: Syndesmotic instability was characterized using motion analysis during external rotation, lateral, and sagittal stress tests on cadaveric specimens (n = 9). A progressive syndesmotic injury was created by sectioning the tibiofibular and deltoid ligaments. Applied loads and fibular motion were synchronously measured using a force transducer and motion capture, respectively, while mortise and lateral radiographs were acquired to quantify clinical measurements. Fibular motion in response to these 3 stress tests was compared between the intact, complete lateral syndesmotic injury and lateral injury plus a completely sectioned deltoid condition. Results: Stress tests performed under lateral imaging detected syndesmotic injuries with greater sensitivity than the clinical-standard mortise view. Lateral imaging was twice as sensitive to applied loads as mortise view imaging. Specifically, half as much linear force generated 2 mm of detectable syndesmotic motion. In addition, fibular motion increased linearly in response to sagittal stresses (Pearson’s r [ρ] = 0.91 ± 0.1) but not lateral stresses (ρ = 0.29 ± 0.66). Conclusion: Stress tests using lateral imaging detected syndesmotic injuries with greater sensitivity than a typical mortise view. In addition to greater diagnostic sensitivity, reduced loads were required to detect injuries. Clinical Relevance: Syndesmotic injuries may be better diagnosed using stress tests that are assessed using lateral imaging than standard mortise view imaging.

Zong, Guanggong, Jinjiang Zhou, Mengyan Zhang, Yanqiu Ma, Yang Zhao, Xiaoyan He, Jianxiu Hao, and Fangfang Wang. "Effect of Mortise and Tenon Structure on the Properties of Wood Flour Polyvinyl Chloride-Laminated Veneer Lumber Co-Extruded Composites." Polymers 15, no. 9 (April 30, 2023): 2151. http://dx.doi.org/10.3390/polym15092151.

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Core–shell composites with strong weather resistance, mechanical strength and creep resistance can be prepared using co-extrusion technology. Considering the weak bonding strength between core–shell interfaces, this study started from the concept of a mortise and tenon combination; three types of conical, rectangular and trapezoidal mortise and tenon joints were prepared, and their bending properties, long-term creep properties, interfacial bonding properties, and dimensional stability properties were tested. Results showed that the mortise and tenon structure could form a mechanical interlock between the outer-shell-layer polyvinyl chloride (PVC) wood–plastic composite (WPVC) and the inner-core-layer laminated veneer lumber (LVL), which could effectively improve the interface bonding property between the two layers. Among them, the trapezoidal mortise and tenon structure had the largest interface bonding force compared with the tapered and rectangular mortise and tenon structure, where the interface bonding strength reached 1.01 MPa. Excellent interface bonding can effectively transfer and disperse stress, so the trapezoidal mortise and tenon structure had the best bending properties and creep resistance, with a bending strength of 59.54 MPa and a bending modulus of 5.56 GPa. In the long-term creep test, the deformation was also the smallest at about 0.2%, and its bending properties, creep resistance and interface bonding performance were also the best. The bending strength was 59.54 MPa and the bending modulus was 5.56 GPa; in the long-term creep test, the strain curve was the lowest, about 0.2%. In addition, the mortise and tenon structure could disperse the stress of the inner shell LVL after water absorption and expansion, thus significantly improving the dimensional stability of the co-extruded composite after water absorption.

Belmahi, Samir, Mohammed Zidour, and Tayeb Bensatllah. "Mechanical behavior of mortars composed of a mixture of cement and lime stone filler." Lebanese Science Journal 19, no. 1 (April 27, 2018): 95–104. http://dx.doi.org/10.22453/lsj-019.1.095-104.

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This work consists in studying the mechanical behavior of mortars composed of a mixture of cement and fire-clay. The limestone filler is used as an additive in this mixture. The main idea wasto compare this mortar with an ordinary mortar,made with a normal sand, thus,to know the limit of their use in construction.The results showed and confirmed that fire-clay mortar, cannot give better resistances than a normal sand mortar. The second idea wasto introduce the limestone filler manufactured by ENG Tlemcen (Algeria) as an addition. Theproposed percentages varied from 5% to 30% of the cement mass. The resultsobtained showed that the substitution of a part of cement by the limestone filler helps to improve the mechanicals resistances of mortars and that the best fraction of limestone filler wasfixed at 10%.

Yang, Deshan, Ming Xu, and Zhongfan Chen. "Experimental study on the reinforcement methods and lateral resistance of mortise-tenon jointed traditional timber frames." BioResources 16, no. 2 (April 20, 2021): 4039–51. http://dx.doi.org/10.15376/biores.16.2.4039-4051.

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In order to study the lateral resistance of reinforced traditional Chinese timber frames with mortise-tenon connections, three cyclic tests were conducted on one-bay mortise-tenon jointed traditional timber frames. Three reinforcement methods, i.e., steel angle strengthening, wood brace, and Timu, were studied. Seismic performances were evaluated according to the experimental phenomena and the test results. The failure mode, hysteresis curves, skeleton curves, curves of stiffness degradation, and energy dissipation capacity of the three specimens were analyzed based on the tests. The test results showed that the wood frames had good deformability. The stiffness degradation of the timber frame was severe at the initial loading stage; however, the degradation rate tended to decrease after the initial stage. In addition, the energy dissipation increased as the lateral displacement increased. The wooden frames with mortise tenon joints strengthened by steel angle, wood brace, and Timu can achieve good aseismic results. The study can provide a theoretical basis for seismic design and reinforcing methods of traditional timber structures.

Bessa, Anissa, Jean-Philippe Bigas, and Jean-Louis Gallias. "Méthode d'évaluation de l'effet des additions minérales sur le besoin en eau et l'adjuvantation des mortiers." Revue Française de Génie Civil 8, no. 2-3 (February 2004): 181–201. http://dx.doi.org/10.1080/12795119.2004.9692602.

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Suh, Jae Wan, Sunghyun Kim, and Hyun-woo Park. "Clinical Significance of Lateral Ankle Radiograph after the Reduction of a Syndesmosis Injury." Foot & Ankle Orthopaedics 3, no. 3 (July 1, 2018): 2473011418S0047. http://dx.doi.org/10.1177/2473011418s00470.

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Category: Trauma Introduction/Purpose: To introduce reliable and newly developed radiographic measures based on a lateral ankle radiograph to assess a syndesmotic reduction after screw fixation and to compare with the radiographic measures based on the anteroposterior (AP) and mortise radiographs. Methods: The postoperative ankle radiographs of 34 ankle fracture cases after screw fixation for concurrent syndesmosis injury were reviewed. Two radiographic parameters were measured on each AP and mortise radiograph; tibiofibular clear space (TFCS) and tibiofibular overlap (TFO). Five radiographic parameters were measured on the true lateral radiographs; the anteroposterior tibiofibular (APTF) ratio, anterior tibiofibular ratio (ATFR), posterior tibiofibular ratio (PTFR), distances of intersection of the anterior fibular border and the tibial plafond to anterior cortex of the tibia (AA’), and the intersection of posterior fibular border and tibial plafond to the tip of the posterior malleolus (BB’). In addition, the distance (XP) between the fibular posterior margin (X) crossing tibial plafond or the posterior malleolus and posterior articular margin (P) of the tibial plafond was measured on the lateral view. Results: Using TFCS and TFO in the AP and mortise radiographs, malreductions of syndesmosis were estimated in 17 of 34 cases (50.0%). Using the introduced and developed radiographic measures in the lateral radiographs, syndesmotic malreductions were estimated in 16 out of 34 cases (47.1%). Seventeen cases (50.0%) showed no evidence of postoperative diastasis using the radiographic criteria on the AP and mortise view, 10 cases (58.8%) of whom showed evidence of a malreduction on the lateral radiograph. The newly developed measurements, XP, were measured 0 in 11 out of 34 cases (32.4%). Conclusion: The reduction of syndemosis after screw fixation can be accurately assessed intraoperatively with a combination of several reliable radiographic measurements of lateral radiograph and traditional radiographic measurements of AP and mortise radiograph. Using various radiographic parameters selectively, malreduction could be prevented even when some parameters are difficult to measure because of implants or when posterior malleolar fracture is accompanied.

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Дисертації з теми "Mortier – Additifs":

Messan, Adamah. "Contribution à l'étude du comportement au très jeune âge des structures minces en mortier." Montpellier 2, 2006. http://www.theses.fr/2006MON20159.

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Ce travail de recherche porte sur le retrait plastique et la fissuration induite pour les matériaux cimentaires présentant une grande surface libre par rapport au volume. Le mortier de référence considéré pour cette étude est une formulation par ailleurs exploitée dans le cadre des travaux initiés par le projet CEReM (Consortium pour l’Etude et la Recherche sur les Mortiers). Dans le cadre de cette thèse, un ensemble de moyens expérimentaux a été mis en place de façon à étudier le comportement du mortier au très jeune âge dans des conditions de retrait libre et de retrait empêché. La mesure sans contact du retrait surfacique est réalisée au moyen d’une instrumentation optique. Une nouvelle technique de retrait empêché a été également mise en place : elle se distingue des autres couramment rencontrées dans la littérature par sa simplicité et elle permet d’avoir directement l'évolution de la contrainte interne de traction dans le matériau au cours du retrait. L'ensemble de ces protocoles expérimentaux ont permis d’étudier l'influence des fibres (fibres de verre, fibres de polypropylène), de l'adjuvant anti-retrait (type Glycol), des poudres de polymère (éther de cellulose, le latex “EVA”) sur le comportement au très jeune âge du matériau cimentaire. Une partie de la thèse est consacrée à la modélisation numérique du comportement du matériau cimentaire au cours du retrait plastique (du gâchage jusqu'au seuil de durcissement). Dans cette partie, un modèle élastoplastique est proposé. La plasticité est décrite par le critère isotrope de Von Mises dans lequel nous avons introduit une évolution de la surface de charge en fonction de la maturation du matériau. L'implantation de ce modèle de comportement dans un code de calcul a conduit à la simulation numérique de l’essai de retrait empêché : une comparaison entre modèle et expérience est ensuite discutée

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

Baz, Bilal. "Influence of the fresh state properties of 3D printable concrete on the steel-concrete bonding and durability." Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2020. http://www.theses.fr/2020MTLD0003.

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La fabrication additive ou impression 3D est la technique la plus récente introduite dans le secteur de la construction. De nombreuses questions restent posées, notamment la maîtrise des propriétés à l'état frais et durci du matériau utilisé, et la stratégie de renforcement pour fournir la ductilité et les capacités structurelles des éléments.Cette thèse traite de l’effet des propriétés à l’état frais du matériau sur l’état durci et sur la réponse mécanique des éléments imprimés. Le travail a commencé par la formulation et la caractérisation rhéologique de nouveaux mélanges imprimables. La thixotropie des mortiers, c’est à dire de la variation du seuil de cisaillement au cours du temps, a été particulièrement étudiée et permet une meilleure compréhension de l'effet de certains adjuvants chimiques et minéraux sur la vitesse de structuration du mélange. Ensuite, la relation entre la rhéologie du matériau et la liaison développée avec les armatures a été explorée, en tenant compte de la direction des couches par rapport à la barre sur la qualité de la liaison. Enfin, cette recherche comprend une caractérisation microstructurale des matériaux imprimés, ainsi qu'une évaluation de la durabilité des éléments imprimés lorsqu'ils sont soumis à des attaques d'acide sulfurique.Plus précisément, l'évolution du seuil de cisaillement a été mesurée pour différents mélanges imprimables sur une certaine période de temps à l'aide du pénétromètre à chute libre, et l'effet de certains additifs chimiques et minéraux a été examiné. Ici, il a été constaté que les paramètres de formulation influencent le taux de structuration du mélange, mais dans des amplitudes différentes. En particulier, l'ajout de superplastifiant, de filler calcaire et l’augmentation du dosage en eau diminuent le taux de structuration du matériau, alors que l’agent de viscosité l'augmente. Ensuite, l'effet de la rhéologie du matériau, de la méthode d'impression et de la direction des couches par rapport à la barre, sur la qualité de la liaison acier/béton imprimé a été étudié à travers des tests d'arrachement sur des éléments imprimés réalisés manuellement ou à l'aide d'une imprimante automatisée. Ici, différents mélanges avec des ouvrabilités et des comportements thixotropes différents ont été utilisés. Des couches parallèles et perpendiculaires à la barre ont été imprimées. Les résultats ont montré que les échantillons imprimés étaient capables de développer une contrainte d’adhérence acceptable par rapport aux échantillons moulés. Ces résultats indiquent également que l'impression manuelle peut être considérée comme une méthode d'essai préliminaire pour simuler le travail d'une imprimante, et que la rhéologie du matériau n’a pas eu d’effet majeur sur la liaison avec les barres. De plus des couches imprimées parallèlement à la barre présentent une meilleure liaison par rapport à celle obtenue pour les échantillons ayant des couches imprimées perpendiculairement. Concernant l'évaluation de la microstructure et de la durabilité des échantillons imprimés, différents mélanges ont été utilisés pour couvrir une large gamme de propriétés des matériaux. Ici, des échantillons imprimés ont été exposés à différentes concentrations d'acide sulfurique et la microstructure des échantillons dégradés et non dégradés a été évaluée. Les résultats ont montré que les échantillons qu'ils soient imprimés ou non, ont les mêmes performances contre une attaque acide. En particulier, les échantillons imprimés n'ont montré aucun signe de faiblesse entre les couches, ni à une échelle micro ni à une échelle macro. La différence majeure entre un échantillon imprimé et un échantillon coulé est que les échantillons imprimés ont une distribution et une morphologie de la taille des pores plus étalées, ce qui est causé par les paramètres d'impression utilisés
Currently, the latest technique being introduced to the construction field is known as Additive Manufacturing or 3D printing. Many challenges encounter this technique, notably the fresh and hardened state properties of the cementitious material used for 3D printing; and the reinforcement strategy to provide ductility and tensile capacity for structural elements.This thesis deals with the effect of the material’s fresh state properties on the hardened state and mechanical response of 3D printed elements. Initially, the work has started by formulating new printable mixes and testing their rheological properties; in particular their thixotropic behavior, depending on the material’s yield stress variation over a certain period of time. After then, the results were linked to the mechanical and hardened state performance of 3D printed elements. Thus, a better understanding of the effect of certain chemical and mineral admixtures on the thixotropic behavior of the mix was carried out. Then, the relation between the material’s rheology and thixotropic behavior with the bond developed between printed layers and reinforcing bars has been exposed, and the effect of the layers direction with respect to the steel bar on the quality of the bond was further assessed. At last, this research includes a microstructural characterization of 3D printed materials, as well as a durability assessment of the printed elements performance when subjected to sulfuric acid attacks.More precisely, the yield stress evolution so-called thixitropic behavior was measured for different printable mixes over a certain period of time using the fall-cone penetrometer; and the effect of some chemical and mineral additives was considered. Herein, it was found that the material variables influence the structuration rate of the mix, but in different magnitudes. In particular, the addition of HRWR, Limestone filler and water content decrease the structuration rate of the material, whereas VMA increases it. Afterwards, the effect of the material’s rheology, printing method and layers direction with respect to steel bar, on the developed link have been studied through a series of pull-out tests done over printed elements made either manually using a laboratory device or using an automated printer. Herein, different mixes with different workabilities and thixotropic behaviors were used. Alongside, concrete layers were printed either parallel or perpendicular to the steel bar. The overall results showed that printed samples were able to develop an acceptable bond strength in comparison with the mold casted specimens. Implicitly, these results indicated first that the manual printing can be considered as a preliminary testing method to simulate the work of an actual printer; second, the material’s rheology did not majorly affect the bond with steel bars; third, parallel printed layers to the steel bar can still provide better bonding with it in comparison to that attained by the samples having perpendicular printed layers. As for the microstructural and durability assessment of 3D printed samples, different mixes were used to cover a wider range of material properties. Here, 3D printed samples were exposed to different concentrations of sulfuric acid, and the microstructure of the degraded and non-degraded samples was assessed. The results showed that concrete samples whether printed or not have the same performance when subjected to acid attack. In particular, printed samples did not show any sign of inter-layer weaknesses, neither at a micro nor macro scales. However, the only difference between a printed specimen and a non-printed one is that printed samples have a more spread pore size distribution and morphology, which is caused by printing parameters used

Kara-Ali, Ramdane. "Influence des additions minérales sur le besoin en eau et les résistances mécaniques des mélanges cimentaires." Cergy-Pontoise, 2002. http://www.theses.fr/2002CERG0252.

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Fattahi, Salma. "Étude de l'autocicatrisation de mortiers contenant des additions réactives." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/7588.

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Les objectifs de cette thèse sont de mieux comprendre le phénomène d’autocicatrisation naturelle et d’initier une démarche en vue de proposer des approches technologiques pratiques, fiables et peu couteuses qui permettront d’optimiser et de favoriser le potentiel d’autocicatrisation des bétons et des matériaux cimentaires en général. Les approches proposées consistent à introduire, dans les formulations des matériaux cimentaires, des réactifs internes latents qui permettront d’augmenter le potentiel d’autocicatrisation par différents mécanismes. Trois types de réactifs sont étudiés; des ajouts cimentaires riches en chaux libre, des ajouts granulés riches en ciment anhydre et/ou en chaux libre et des micro-granulats de verre riches en silice amorphe. L’ajout des ajouts cimentaire et des granulés visent à augmenter le potentiel d’autocicatrisation par carbonatation. L’ajout des micro-granulats de verre a pour objectif de créer, dans les fissures un gel silico-calcaire alcalin expansif. Il en ressort que l’augmentation de la teneur en portlandite de la matrice en ajoutant de réactifs riches en chaux libre augmente considérablement le potentiel d’autocicatrisation de fissures larges (>200 µm). L’ajout de granulés faiblement hydratés à base de ciment ou de ciment avec agent expansif à base de chaux libre confère aux mortiers une capacité de cicatrisation accrue. La formation de gel expansif dans les fissures suite à l’activation de la réaction alcali-silice des micro-granulats de verre ne confère pas à la matrice cimentaire un fort potentiel d’autocicatrisation entre 0 et 12 mois.

Vitry, Solweig. "Additifs colloïdaux organiques de ciments alumineux auto-nivelants : synthèse, ineractions, contribution aux propriétés finales." Lyon 1, 2004. http://www.theses.fr/2004LYO10274.

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Les adjuvants polymère peuvent apporter de signifcatives améliorations à diverses propriétés de mortiers et de bétons. Cependant, même si de nombreux produits commerciaux sont actuellement sur le marché, il est impossible à ce jour d'établir un lien formel entre les caractéristiques physico-chimiques de l'adjuvant et son impact sur différentes propriétés du matériau auquel il est ajouté. L'objectif de cette étude est donc la synthèse d'adjuvants modèles afin d'étudier les impacts respectifs de deux aspects des latex : les propriétés liées à la nature chimique du polymère (hydrophilie et Tg), ainsi que celles liées à la nature de la surface des particules (tensioactifs et colloïdes protecteurs de différentes natures, charges greffées). Il sera alors possible d'associer chaque modification des proprités du mortier à la caractéristique du latex qui en est à l'origine. Nous étudierons ensuite la stabilité de l'adjuvant, son adsorption éventuelle sur les phases minérales ainsi que sa localisation dans la microstructure du mortier. Enfin, nous montrerons que la présence d'un adjuvant polymère modifie le processus d'hydratation du ciment et influence directement le nombre ainsi que la taille des hydrates formés

Badreddine-Bessa, Anissa. "Etude de la contribution des additions minérales aux propriétés physiques, mécaniques et de durabilité des mortiers." Cergy-Pontoise, 2004. http://biblioweb.u-cergy.fr/theses/04CERG0305.pdf.

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Ce travail propose de quantifier par une méthodologie expérimentale rigoureuse l'effet des additions minérales sur la variation du besoin en eau et du besoin en adjuvant des mortiers, leur contribution au remplissage de la porosité et à l'amélioration des résistances mécaniques ainsi que leur action aux propriétés de transfert et à la résistance chimique en milieu agressif sévère. Les principales variables de formulation sont la nature minéralogique, la finesse et la quantité de l'addition, le type de ciment et son dosage. Les résultats obtenus montrent que les additions, indépendamment de leur nature et jusqu'à une certaine quantité, contribuent à maintenir les propriétés de transfert des mortiers sans former un volume important de nouveaux produits hydratés capables de réduire la porosité ouverte. En revanche, la nature et la finesse des additions sont déterminantes pour leur contribution au développement des résistances mécaniques et dans un moindre degré à la résistance chimique
This work proposes to quantify by a rigorous experimental methodology the effect of mineral additions on the water requirement and the superplasticizer requirement variation of mortars, their contribution to filling the porosity and to improving the mechanical strength, and their action to the transfer properties and to the chemical resistance in hard aggressive medium. The principal mixture proportion variables are the mineralogical nature, fineness and quantity of the addition, the cement type and proportioning. The obtained results show that the additions, independently of their nature and until a certain quantity, contribute to maintain the mortars transfer properties without forming a high volume of new hydrated products able to reduce open porosity. On the other hand, the additions nature and fineness are determining for their contribution to the mechanical strength development and in a lesser extent to the chemical resistance

Badreddine-Bessa, Anissa Gallias Jean-Louis. "Etude de la contribution des additions minérales aux propriétés physiques, mécaniques et de durabilité des mortiers." [S.l.] : [s.n.], 2008. http://biblioweb.u-cergy.fr/theses/04CERG0305.pdf.

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Engelaère, Charlotte. "Etude de valorisation des coproduits marins coquilliers sous forme d'additions et de granulats dans les matériaux cimentaires." Caen, 2012. http://www.theses.fr/2012CAEN2053.

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Dans le but de gérer les déchets coquilliers générés par la pêche et l’aquaculture, une valorisation dans les matériaux cimentaires est envisagée. Trois types de coquilles présentes localement sont utilisés : huître, coquille Saint-Jacques et crépidule. Chacun d’eux est trié, nettoyé, concassé, tamisé pour obtenir les fractions granulométriques : 0/0,063 mm, 0,063/2 mm, 2/4 mm, 4/6,3 mm, 6,3/10 mm et 10/14 mm. Les caractéristiques des coquilles sont déterminées pour définir leurs potentiels et appréhender leur comportement dans les matériaux cimentaires. Les conclusions confortent ce choix de valorisation et l’intégration des coquilles est étudiée dans les mortiers et les bétons, en tant qu’additions, granulats et fillers. Les résultats sur mortiers montrent que l’huître et la coquille Saint-Jacques sont performantes sous forme d’additions ; les crépidules sont plus appropriées en tant que granulats. Globalement, l’ajout de coquilles en remplacement de granulats entraîne une perte d’ouvrabilité et de résistance du matériau cimentaire. La comparaison des mortiers et bétons est faite à consistance similaire : un ajout d’eau est donc nécessaire pour conserver l’ouvrabilité et peut expliquer les baisses de résistances. Un superplastifiant est alors ajouté à certaines formulations de béton. Leurs résistances sont 1,1 à 1,9 fois plus importantes que celles des bétons témoins. Les analyses microstructurales ne révèlent pas la présence d’un nouveau matériau formé : les coquilles auraient donc un rôle de remplissage dans la matrice cimentaire. Ce travail de recherche témoigne de la possible et bénéfique intégration des coquilles dans les matériaux cimentaires
This research work was born from a desire to manage waste shells produced by fishing and shellfish farming activities. In this purpose, a study of waste shells reusing in cementitious materials is envisaged. Three types of local shells are used: oyster, scallop and slipper limpet. Each of them is sorted, cleaned, crushed, sieved to obtain the grading fractions: 0/0,063 mm, 0,063/2 mm, 2/4 mm, 4/6,3 mm, 6,3/10 mm and 10/14 mm. Shells properties are determined to define their best potentialities and to comprehend their behavior in cementitious materials. The conclusions consolidate this reuse idea, and shells integration is studied in mortar and concrete, as additions, aggregates and fillers. The mortars results show that oyster and scallop shells are successful as additions, slipper limpet shells are better as aggregates. From a global point of view, the aggregates substitution by shells decreases workability and resistance of cementitious materials. Mortar and concrete were made with the same workability; an addition of water is thus necessary to maintain the workability and can explain the resistance decrease. A superplasticizer is then added to some concrete. Their resistances are 1. 1 to 1. 9 times more important than control concrete specimens. The microstructural analysis survey reveals that no new material seems to be formed; shells would thus have a role of filling in cement matrix. This research work confirms the possible and beneficial integration of shells as addition, fillers or aggregates into cementitious materials

Fogaça, Fabíola Helena dos Santos [UNESP]. "Efeito do tocoferol no desempenho e na estabilidade lipidica da tilápia nilotica (Oreochromis niloticus)." Universidade Estadual Paulista (UNESP), 2006. http://hdl.handle.net/11449/86711.

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Made available in DSpace on 2014-06-11T19:22:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-01-27Bitstream added on 2014-06-13T19:48:40Z : No. of bitstreams: 1 fogaca_fhs_me_jabo.pdf: 596326 bytes, checksum: 558f30e4e45f55982f56059d2fab70b4 (MD5)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Universidade Estadual Paulista (UNESP)
A vitamina E é usada nas dietas com a finalidade de melhorar o crescimento, a resistência ao estresse e a doenças, assim como a sobrevivência de peixes. Também pode ser eficiente na conservação do pescado durante o processamento e estocagem, inibindo a degradação dos lipídios pela oxidação. O presente trabalho avaliou os efeitos antioxidantes da vitamina E in vivo e in vitro na qualidade final dos hambúrgueres produzidos com filés de tilápias congelados durante 0, 30, 60 e 90 dias. Foi utilizado um delineamento inteiramente casualizado, com seis tratamentos, em esquema fatorial 3x2, caracterizado pela suplementação de dois níveis de vitamina E nas dietas (100 e 200 mg / kg de ração) e o grupo controle (zero mg/kg de ração) e adição ou não de 100 ppm de vitamina E aos hambúrgueres, com quatro repetições. Os peixes, com peso médio inicial de 184,23 + 1,68g foram alimentados com as dietas experimentais durante 63 dias. Após esse período, foram abatidos e os filés processados em hambúrgueres. Foram avaliados os parâmetros de desempenho, composição centesimal e a oxidação lipídica, determinada pelas substâncias reativas ao ácido tiobarbitúrico (SRATB). Os resultados mostraram que não houve diferença significativa para as variáveis de ganho de peso, conversão alimentar e crescimento específico entre os tratamentos. A composição química variou dentro dos valores encontrados para pescados. O aumento do nível de vitamina E promoveu redução nos valores de SRATB das amostras em todos os intervalos de tempo, e que a adição in vivo da vitamina E protegeu os hambúrgueres da oxidação lipídica de forma mais eficiente do que a adição in vitro, sendo que a interação entre ambas resultou em maior redução nas taxas de oxidação.
Vitamin E is used in diets with the aim of enhancing growth, resistance to stress and pathology, and also fish survival. It can be efficient in fish conservation during processing and frozen storage, inhibiting lipid degradation from oxidation. The present work evaluated the antioxidant effects of vitamin E utilization in vivo and in vitro in the final quality of hamburgers made from tilapia filets during frozen storage over 3 months. A randomized design, in a 3x2 factorial scheme was utilized, which correspond to the two levels of diet vitamin E (100 and 200 mg / kg diet) and the control group (zero mg/kg diet) and addition or not of 100 ppm of vitamin E to the hamburgers, with four repetitions. The fishes, with initial weight 184.23 + 1.68 g, were fed the experimental diets for 63 days, after which they were killed and processed into hamburgers. The performance parameters analyzed were centesimal composition and lipid oxidation, determined by the thiobarbituric acid reactive substances (TBARS). The results showed no significant difference between treatments for weight gain, food conversion or specific growth. The chemical composition varied within the values found for fish. Increased vitamin E levels promoted reduction of TBARS values over all time intervals. This means values suggested that the addition in vivo of tocopherol protected the hamburgers from lipid oxidation more efficiently when compared to in vitro addition, but the interaction between both resulted in higher reduction in rate of oxidation.

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Книги з теми "Mortier – Additifs":

Vázquez, Fernando Triviño. Oclusión de poros por tratamiento químico. Madrid: Instituto de Ciencias de la Construcción Eduardo Torroja, 1992.

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V, Ramakrishnan. Latex-modified concretes and mortars. Washington, DC: Transportation Research Board, National Research Council, 1992.

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Bean, Dennis L. Latex admixtures for Portland cement concrete and mortar. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1986.

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Bean, Dennis L. Latex admixtures for Portland cement concrete and mortar. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1986.

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Bean, Dennis L. Latex admixtures for portland cement concrete and mortar. Washington, D.C: U.S. Army Corps of Engineers. Dept. of the Army, 1986.

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Dvorkin, Leonid, Vadim Zhitkovsky, Mohammed Sonebi, Vitality Marchuk, and Yuri Stepasiuk. Improving Concrete and Mortar Using Modified Ash and Slag Cements. Taylor & Francis Group, 2020.

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Dvorkin, Leonid, Vadim Zhitkovsky, Mohammed Sonebi, Vitality Marchuk, and Yuri Stepasiuk. Improving Concrete and Mortar Using Modified Ash and Slag Cements. Taylor & Francis Group, 2020.

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Dvorkin, Leonid, Vadim Zhitkovsky, Mohammed Sonebi, Vitality Marchuk, and Yuri Stepasiuk. Improving Concrete and Mortar Using Modified Ash and Slag Cements. Taylor & Francis Group, 2020.

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Foley, John Miles. Getting Started: How to Surf the Pathways Project. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252037184.003.0003.

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This chapter presents further terminologies unique to the Pathways Project book and website, and furthermore discusses options for how the contents of both media can be read. For both modes of presentation, the chapter introduces an extended version of web-speak to describe words, pathways, and other phenomena across the three agoras. Thus oral words will be oWords, electronic pathways will be ePathways, textual agoraphobia will be tAgoraphobia, and so forth. In addition, this chapter provides overviews of the Pathways Project wiki and homepage, as well as that of the succeeding chapters of this book. Finally, it discusses the limitations of the book—the “brick-and-mortar” aspect of the Pathways Project—as well as a few additional reminders for proper navigation of the tAgora.

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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Частини книг з теми "Mortier – Additifs":

Dryja, Maksymilian. "Additive Schwarz Methods for Elliptic Mortar Finite Element Problems." In Modelling and Optimization of Distributed Parameter Systems Applications to engineering, 31–50. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-0-387-34922-0_3.

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El Abbaoui, Khalid, Issam Al Korachi, Md Tusher Mollah, and Jon Spangenberg. "CFD Modelling of Mortar Extrusion and Path Planning Strategy at the Corner for 3D Concrete Printing." In Springer Tracts in Additive Manufacturing, 173–83. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-32927-2_16.

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Ghosal, Mainak, and Arun Kumar Chakraborty. "Mechanical and Microstructural Characterization of Cement Mortar with Nanosilica Additions." In Advanced Microscopy, 219–46. New York: Apple Academic Press, 2022. http://dx.doi.org/10.1201/9781003282044-11.

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Pungercar, Vesna, Martino Hutz, and Florian Musso. "3D Print with Salt." In 3D Printing for Construction with Alternative Materials, 91–125. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-09319-7_5.

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AbstractSustainable materials and additive manufacturing have the potential to increase material efficiency and minimize waste in the building process. One of the most promising materials is salt (sodium chloride). It is highly available as a residue of desalination and potash production processes and attracts attention due to its material properties (storage of humidity and heat). This research presents an investigation and evaluation of using salt as an alternative material in additive manufacturing. Thus, the focus of the study was on small-scale 3D printing with paste extrusion. Experimental studies of different salt mixtures with different binders, printing properties and other parameters were analyzed in three stages. In the first phase (P1) the mixing ratio of salt and potential binders (clay, gypsum, cement and starch) was defined; in the phase two (P2) the most promising mixture was selected, modified by additives and investigated by 3D image scan measurements; and in the last third phase (P3) the potential applications of salt in additive manufacturing were presented. As the research shows, the salt in material extrusion processes can substitute the main material by up to 70%, is successfully manipulated with different additives (to improve the workability of the printing mortar) and is highly dependent on the printer`s settings. For future full-scale 3D printing with salt many steps still have to be taken. However, incorporating salt in additive manufacturing showed a potential of saving material resources, addressing environmental issues and initiating new construction processes.

Pradhan, Shashwati Soumya, and Sunita Sahu. "Strength Improvement of Cement Mortar by the Addition of Ureolytic Microorganism." In Lecture Notes in Civil Engineering, 887–95. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3317-0_79.

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Santos, Rodrigo Felipe, Rita de Cássia Silva Sant’ana Alvarenga, Beatryz Mendes, José Maria Carvalho, Leonardo Pedroti, and Afonso Azevedo. "Addition of Dregs in Mixed Mortar: Evaluation of Physical and Mechanical Properties." In The Minerals, Metals & Materials Series, 419–27. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72484-3_44.

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Azevedo, A. R. G., D. L. Rocha, T. E. S. Lima, M. T. Marvila, E. B. Zanelato, J. Alexandre, S. N. Monteiro, and H. Colorado. "Characterization of Mortar in Fresh State with the Addition of Açai Fiber." In Characterization of Minerals, Metals, and Materials 2022, 247–55. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92373-0_23.

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Diwan, Anushree, Shiv Singh Patel, Ankit Pal, Ashutosh Dwivedi, J. P. Shukla, S. K. Panthi, and Ramakant Agrawal. "Flow Characteristics of Cement Mortar with Varied Silica Fume for Additive Construction." In Lecture Notes in Civil Engineering, 191–201. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2676-3_16.

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Ayed, Rabeb, Emiliano Borri, Gabriel Zsembinszki, Salwa Bouadila, Luisa F. Cabeza, and Mariem Lazaar. "Use of Textile Fiber Waste to Improve the Thermal and Mechanical Performance of Cement-Based Mortar." In Lecture Notes in Civil Engineering, 273–81. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57800-7_25.

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AbstractImproving the thermal properties of materials used in buildings is crucial to reducing energy demand and consumption. This study investigated the use of textile fiber waste in cement-based composites for construction applications. Mechanical and thermal characterizations were carried out to assess the behavior of cement mortars with different percentages of two types of textile fibers after 7 and 28 days of water hardening. The results show that the incorporation of fibers can significantly improve the thermal insulation capacity of buildings by reducing the thermal conductivity of cement mortar by up to 52%. In addition, the use of textile fibers can improve the mechanical strength of the cement mortar, especially with a high fiber content and a longer curing time.

Verian, Kho P., Jarron Ashcroft, Jim Ziemlaski, Tim Brodesser, Jonathan Ladouceur, Matthew D. Carli, Randall P. Bright, and Eerik Maandi. "The Assessment of the Buildability and Interlayer Adhesion Strength of 3D-Printed Mortar." In Standards Development for Cement and Concrete for Use in Additive Construction, 99–116. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2021. http://dx.doi.org/10.1520/stp163620200085.

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Тези доповідей конференцій з теми "Mortier – Additifs":

Strömberg, N. "Multi-Scale Topology Optimization of Bodies with TPMS-based Lattice Structures and Mortar Contact Interfaces." In IVth International Conference on Simulation for Additive Manufacturing. CIMNE, 2023. http://dx.doi.org/10.23967/c.simam.2023.005.

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Lai, Guangxing, Jianli Yin, Yuanqiang Guo, and Tianxing Lin. "Influence of clay composition in machine-made sand on the performance of mortar and concrete." In Second International Conference on Medical Imaging and Additive Manufacturing (ICMIAM 2022), edited by Yusri Yusof. SPIE, 2022. http://dx.doi.org/10.1117/12.2636649.

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Jumate, E., D. Moldovan, R. Fechete, and D. Manea. "NMR relaxometry study of plaster mortar with polymer additives." In PROCESSES IN ISOTOPES AND MOLECULES (PIM 2013). AIP, 2013. http://dx.doi.org/10.1063/1.4833708.

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Yahya, Zarina, Rafiza Abd Razak, Mohd Mustafa Al Bakri Abdullah, Mohd Azrin Adzhar Rahim, and Armia Nasri. "Rice husk (RH) as additive in fly ash based geopolymer mortar." In 3RD ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2017 (EGM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5002415.

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Abramenkova, G., A. Abramenkovs, and M. Klavins. "Optimization of Radioactive Waste Cementation for Decommissioning of Salaspils Research Reactor." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59066.

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This paper deals with information on the radioactive waste cementation technology for decommissioning of Salaspils Research Reactor (SRR). Dismantled and segmented radioactive materials were cemented in concrete containers using tritiated water-cement mixture. The viscosity of water-cement mortar, mechanical tests of solidified mortar’s samples, change of temperature of the samples during solidification time and long time leakage of 137Cs, 14C, 60Co and 3T radionuclides was studied for different water-cement compositions with additives. The pH and electro conductivity of the solutions during leakage tests were controlled. It was shown, that water/cement ratio significantly influences on water-cement mortar’s viscosity and solidified samples mechanical stability. The role of additives — fly ash and Penetron admix in reduction of solidification temperature is discussed. It was found, that addition of fly ash to the cement-water mortar can reduce the solidification temperature from 81°C up to 62°C. The optimal interval of water ratio in cement mortar is discussed. Radionuclides leakage tests show that the release curves has a complicate structure. The possible radionuclides release mechanisms are discussed. Experimental results indicated that additives can significantly influence on the radionuclides release processes from cemented samples. The optimization of cementation of radioactive wastes in concrete containers was performed using mechanical stability, solidification temperature, radionuclide releases and viscosity of mortar.

Logbi, A., A. Kriker, and Z. Snisna. "Effects of mineral additions on durability and physico-mechanical properties of mortar." In TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES16-Cnam. Author(s), 2017. http://dx.doi.org/10.1063/1.4976251.

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Hamada, Ruqaya F., and Awham M. Hameed. "Effect the addition of foam agent on some properties of cement mortar." In 2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000261.

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Ramdani, Muhammad Adzin Rifqi, M. Mirza Abdillah Pratama, and Cynthia Permata Dewi. "Physical properties of fresh thin bed mortar using polyvinyl acetate-based additives." In PROCEEDINGS OF THE 4TH INTERNATIONAL CONFERENCE ON GREEN CIVIL AND ENVIRONMENTAL ENGINEERING (GCEE 2023). AIP Publishing, 2024. http://dx.doi.org/10.1063/5.0204756.

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Kotb, M., M. Assas, and H. Abd-Elrahman. "Effect of grounded bone powder addition on the mechanical properties of cement mortar." In DESIGN AND NATURE 2010. Southampton, UK: WIT Press, 2010. http://dx.doi.org/10.2495/dn100181.

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Mokhtari, A., A. Kriker, H. Ouaggad, and N. Merad. "Formulation and characterization of date palm fibers mortar by addition of silica fume." In TECHNOLOGIES AND MATERIALS FOR RENEWABLE ENERGY, ENVIRONMENT AND SUSTAINABILITY: TMREES18. Author(s), 2018. http://dx.doi.org/10.1063/1.5039265.

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Звіти організацій з теми "Mortier – Additifs":

Bigl, Matthew, Samuel Beal, and Charles Ramsey. Determination of residual low-order detonation particle characteristics from Composition B mortar rounds. Engineer Research and Development Center (U.S.), August 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.

NONLINEAR FINITE ELEMENT ANALYSIS OF ALL-STEEL BUCKLING RESTRAINED BRACES. The Hong Kong Institute of Steel Construction, September 2023. http://dx.doi.org/10.18057/ijasc.2023.19.3.5.

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Buckling restrained braces are gaining popularity in earthquake-resistant designs these days. These braces give stable hysteretic behaviour with a non-buckling steel core encased in a steel tube, that is filled with concrete or mortar. However, in the last few years, researchers have observed that these braces do not need any filler material and can be all-steel. This study aims to carry out a parametric study on All-Steel Buckling Restrained Braces (ASBRBs) by varying the restraining mechanism, the amount of gap between the core and the restrainer, and loading protocols. This paper presents a parametric study conducted on 12 proposed ASBRBs through non-linear finite element analysis. The proposed models have identical inner steel core cross-sections, but the restraining mechanism differs in each case. This paper also includes an experimental study on two small-scale ASBRB specimens. In addition, a finite element study on the effect of variation in stiffness of the transition portion of the core on different performance parameters is carried out. The parameters investigated include hysteretic response, energy dissipation, compression adjustment factor, and strain hardening adjustment factor. The results indicated that the global buckling behaviour of ASBRBs is significantly influenced by the restraining mechanism. In addition, this study also revealed that the global buckling behaviour does not significantly depend on the spacing of the restrainers. It was also observed that BRBs with unstiffened cores show stable hysteretic behaviour up to 2% strain, which deteriorates with further increase in the strain.