Letteratura scientifica selezionata sul tema "Bio-Based concrete"
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Articoli di riviste sul tema "Bio-Based concrete":
1
., Harshali J. "BIO CONCRETE AND BACTERIA BASED SELF HEALING CONCRETE". International Journal of Research in Engineering and Technology 05, n. 05 (25 maggio 2016): 95–99. http://dx.doi.org/10.15623/ijret.2016.0505018.
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Ghorbel, Elhem, Mariem Limaiem e George Wardeh. "Mechanical Performance of Bio-Based FRP-Confined Recycled Aggregate Concrete under Uniaxial Compression". Materials 14, n. 7 (3 aprile 2021): 1778. http://dx.doi.org/10.3390/ma14071778.
Abstract (sommario):
This research investigates the effectiveness of bio-sourced flax fiber-reinforced polymer in comparison with a traditional system based on carbon fiber-reinforced epoxy polymer in order to confine recycled aggregate concretes. The experimental investigation was conducted on two series of concrete including three mixtures with 30%, 50%, and 100% of recycled aggregates and a reference concrete made with natural aggregates. The concrete mixtures were intended for a frost environment where an air-entraining agent was added to the mixture of the second series to achieve 4% air content. The first part of the present work is experimental and aimed to characterize the compressive performance of confined materials. The results indicated that bio-sourced composites are efficient in strengthening recycled aggregates concrete, especially the air-entrained one. It was also found that the compressive strength and the strain enhancement obtained from FRP confinement are little affected by the replacement ratio. The second part was dedicated to the analytical modeling of mechanical properties and stress–strain curves under compression. With the most adequate ultimate strength and strain prediction relationships, the full behavior of FRP-confined concrete can be predicted using the model developed by Ghorbel et al. to account for the presence of recycled aggregates in concrete mixtures.
3
Zhu, Yaguang, Quanquan Li, Peizhen Xu, Xiangrui Wang e Shicong Kou. "Properties of Concrete Prepared with Recycled Aggregates Treated by Bio-Deposition Adding Oxygen Release Compound". Materials 12, n. 13 (3 luglio 2019): 2147. http://dx.doi.org/10.3390/ma12132147.
Abstract (sommario):
Recycled aggregates have high water absorption and crushing index. In order to improve the properties of recycled aggregates in concrete production, various treatments were used to modify the aggregates. In recent years, bio-deposition as a new treatment method of recycled aggregates was environmentally friendly. An improved method of bio-deposition was implemented to modify the properties of recycled mortar aggregates (RMA). O-bio-deposition is based on aerobic bacteria induced CaCO3 precipitation by respiration by varying the distance between the RMA and the bottom of the container and by adding an oxygen release compound to the culture solution that contains bacteria to promote the induction of CaCO3. First, the physical properties, including water absorption, crushing value, and apparent density, of the coarse RMA under different treatment methods were determined, and an o-bio-deposition treatment method was obtained. The fine RMA was treated and compared with the untreated RMA. Concretes were then prepared from the treated coarse RMA, and compressive strength and slump were determined. In addition, the effect of the o-bio-deposition treatment on the RMA surface and the micro-cracks of concretes were observed by scanning electron microscopy (SEM). It was found that the water absorption and crushing index of the coarse RMA treated by o-bio-deposition were reduced by 40.38 and 19.76% compared with untreated RMA, respectively. Regarding the concrete, the slump and the compressive strength (28 d) of concrete were increased by 115% and 25.3%, respectively compared with the untreated concrete.
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Yane Putri, Prima, Isao Ujike e Keiyu Kawaai. "Application of bio-based material for concrete repair: case study leakage on parallel concrete slab". MATEC Web of Conferences 258 (2019): 01013. http://dx.doi.org/10.1051/matecconf/201925801013.
Abstract (sommario):
The applicability of bio-based materials for concrete repair has been studied. This technique employs yeast, glucose and calcium acetate mixed in Tris buffer solution. The microbial metabolic process leads to precipitation of calcium carbonate. First, this study investigated the applicability of bio-based repair materials to small-scale concrete specimens. On this research, water permeability test was carried out to evaluate the effectiveness of the selected mixtures for sealing cracks in the concrete specimens. As the result of permeability tests carried out using specimens with crack width of 0.6 mm, water leakage through crack was observed to be negligible after 216 hours by continuous pouring method using bio-based repair materials. Also, this study showed the initial flow rate for the specimens with the same crack width does not influence crack sealing time. Furthermore, the precipitation of the calcium carbonate from the bio-based materials was analyzed by Fourier-Transformed Infra-Red spectroscopy (FT-IR) and then examined by X-ray Diffraction (XRD) for mineral identification formed through the microbial metabolic process.
5
Yang, Keun-Hyeok, Hee-Seob Lim e Seung-Jun Kwon. "Effective Bio-Slime Coating Technique for Concrete Surfaces under Sulfate Attack". Materials 13, n. 7 (26 marzo 2020): 1512. http://dx.doi.org/10.3390/ma13071512.
Abstract (sommario):
The service life of concretes exposed to sulfate decreases as the concrete body expands due to the formation of gypsum and ettringite. Bacteria-based repair coating layers, which have been studied lately, are aerobic and very effective on the sulfate attack. In this study, bio-slime repair coating layers were fabricated using bacteria, and chloride diffusion experiments were performed. In addition, the service life of concrete under sulfate attack was evaluated using time-dependent diffusivity and a multi-layer technique. Chloride diffusivity was compared with sulfate diffusivity based on literature review, and the results were used to consider the reduction in the diffusion coefficient. In the analysis results, the service life of concrete was evaluated to be 38.5 years without bio-slime coating layer, but it was increased to 41.5–54.3 years using it. In addition, when the thickness of the bio-slime coating layer is 2.0 mm, the service life can be increased by 1.31–2.15 times if the sulfate diffusion coefficient of the layer is controlled at a level of 0.1 ~ 0.3 × 10−12 m2/s. Eco-friendly and aerobic bio-slime coating layers are expected to effectively resist sulfate under appropriate construction conditions.
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Loginova, Svetlana. "Assessment of biological aggressive environment effects on the strength properties and structural-phase composition of concrete". Smart composite in construction 4, n. 2 (23 giugno 2023): 55–63. http://dx.doi.org/10.52957/2782-1919-2024-4-2-55-63.
Abstract (sommario):
The article points out the lack of radically effective worldwide methods of anti-biocorrosion protection. The author considers the role of microorganisms on concrete corrosion, describes the mechanisms of biological effect and biofilm formation on concrete surface. The article focuses on the determination of causes and peculiarities of cement concrete biocorrosion in conditions of high humidity. According to the author, biocorrosive impact reduces strength characteristics of concrete and causes its fast destruction. The author has revealed changes in structural-phase composition of concrete during surface biofouling. Although there are available methods to increase the bio-resistance of cement-based concretes, it is problematic to guarantee their preservation because bio-destructors have the ability to adapt to the work environment. The paper attempts to assess and predict the resistance of a building material in a biologically aggressive environment properly
7
Bhanusuresh, H. S. "Study on bacteria based self-healing properties of bio-concrete - An overview". i-manager’s Journal on Civil Engineering 13, n. 1 (2023): 25. http://dx.doi.org/10.26634/jce.13.1.19319.
Abstract (sommario):
The use of bacteria-based self-healing concrete has gained attention in recent years due to its potential to improve the durability and sustainability of concrete structures. This paper provides an overview of the research conducted on the self-healing properties of bacteria-based bio-concrete. The paper discusses the mechanism of bacterial self-healing in concrete, the types of bacteria used in self-healing concrete, and the methods used to introduce bacteria into the concrete. The paper also reviews comparative studies that evaluate the mechanical properties and durability of selfhealing bacterial concrete compared to traditional concrete. The results of these studies demonstrate that the use of bacteria in concrete can improve the self-healing capacity of the material, leading to better mechanical properties and a higher resistance to cracking and freeze-thaw damage. Furthermore, the paper discusses the potential environmental and economic benefits of using self-healing bacterial concrete. The self-healing capacity of the concrete can reduce the need for costly repairs and maintenance of concrete structures, resulting in lower costs and a reduced environmental impact associated with concrete production. Additionally, the use of waste materials as nutrient sources for bacteria can promote the circular economy and contribute to sustainable development. Overall, this paper highlights the promising potential of self-healing bacterial concrete to improve the durability, sustainability, and economic viability of concrete structures.
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Kemper, Benjamin Norbert. "Bio-Formwork". Open Conference Proceedings 2 (15 dicembre 2022): 65–70. http://dx.doi.org/10.52825/ocp.v2i.130.
Abstract (sommario):
The following research synthesizes biopolymers with digital fabrication tools, such as robotic 3D printing, to complement existing research on reducing the amount of concrete used in buildings. It investigates bio-based and biodegradable polymers for concrete formworks. The climate crisis challenges architects and designers to explore alternative opportunities for sustainable fabrication processes. Biopolymers have emerged as a potential material to replace petroleum-based plastics used in the built environment. This research aims to rethink the materials used in the construction of buildings and suggests introducing bio-based and biodegradable materials in architecture.
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Putri, Prima Yane, Isao Ujike, Nevy Sandra, Fitra Rifwan e Totoh Andayono. "Calcium Carbonate in Bio-Based Material and Factor Affecting Its Precipitation Rate for Repairing Concrete". Crystals 10, n. 10 (29 settembre 2020): 883. http://dx.doi.org/10.3390/cryst10100883.
Abstract (sommario):
The use of bio-based material for repairing concrete is a relatively new method. Therefore, more results from simulated real-condition experiments are needed before being applied on a practical scale. In the recent past, several studies have been conducted on the improvement of bio-based repair materials. In this study, the bio-based material involving yeast, glucose, and calcium acetate mixed in a Tris buffer solution showed the potential to develop a microbial process leading to the precipitation of calcium carbonate. We investigated the factors affecting the precipitation rate of the calcium carbonate of bio-based materials for repairing leakage in the concrete specimens. Based on a series of experiments involving temperature, the type of dry yeast, and the concentration of the Tris buffer solution, the composition of bio-based materials with the highest precipitation rate of calcium carbonate was selected. The selected mixture could be applied to repair leakage of concrete until the cracks are sealed entirely.
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Zawad, Md Fahad Shahriar, Md Asifur Rahman e Sudipto Nath Priyom. "Bio-Engineered Concrete: A Critical Review on The Next Generation of Durable Concrete". Journal of the Civil Engineering Forum 7, n. 3 (31 agosto 2021): 335. http://dx.doi.org/10.22146/jcef.65317.
Abstract (sommario):
Concrete is a prerequisite material for infrastructural development, which is required to be sufficiently strong and durable. It consists of fine, coarse, and aggregate particles bonded with a fluid cement that hardens over time. However, micro cracks development in concrete is a significant threat to its durability. To overcome this issue, several treatments and maintenance methods are adopted after construction, to ensure the durability of the structure. These include the use of bio-engineered concrete, which involved the biochemical reaction of non-reacted limestone and a calcium-based nutrient with the help of bacteria. These bio-cultures (bacteria) act as spores, which have the ability to survive up to 200 years, as they are also found to start the mineralization process and the filling of cracks or pores when in contact with moisture. Previous research proved that bio-engineered concrete is a self-healing technology, which developed the mechanical strength properties of the composite materials. The mechanism and healing process of the concrete is also natural and eco-friendly. Therefore, this study aims to critically analyze bio-engineered concrete and its future potentials in the Structural Engineering field, through the use of literature review. The data analysis was conducted in order to provide gradual and informative ideas on the historical background, present situation, and main mechanism process of the materials. According to the literature review, bio-engineered concrete has a promising outcome in the case of strength increment and crack healing. However, the only disadvantage was its less application in the practical fields. The results concluded that bio-engineered concrete is a new method for ensuring sustainable infrastructural development. And also, it indicated that more practical outcome-based analysis with extensive application in various aspects should be conducted, in order to assess the overall durability.
Tesi sul tema "Bio-Based concrete":
1
Alazhari, Mohamed. "The effect of microbiological agents on the efficiency of bio-based repair systems for concrete". Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.720665.
Abstract (sommario):
The induction of calcium precipitation via bacterial action has been studied increasingly in past years for self-(healing/sealing) concrete applications. Several of these studies have presented promising conclusions that microbiologically induced calcite precipitation might be a useful approach for remediation and rehabilitation of shallow cracks on existing structures. Such studies have noted the necessity to encapsulate the ingredients (bacteria, nutrients and organic precursors) separately for self-healing concrete using microbiologically induced calcite precipitation. However, during mixing there is a chance that capsules or other carriers of self-healing agents may release their cargoes and affect the properties of the concrete. Based on the above-mentioned information, the objective of this research was to evaluate whether or not shallow concrete cracks can be remediated using a bacteria-based system of repair. This research also aims to develop a new bacterial agent for use in the remediation of concrete cracks and to understand the effect of bacterial agents on the properties of cement-based mortar. The scope of this research is diverse; it requires an understanding of the factors that affect durability, water permeability, and cement properties such as initial and final setting time as well as the quality and quantity of the precipitated materials from the bacteria-based healing/sealing system. This research is broadly divided into four stages. In spite of a number of studies on the mechanism and efficiency of bacterial self-(healing/sealing) concrete, stage one investigates the effect of bacterial self-(healing/sealing) agents on the properties of fresh and hardened concrete. This information is critical for further research and implementation of this novel material. As with any additives, this may have a negative effect on the concrete’s final properties. This will be viewed with skepticism and limited uptake. This stage included the effects of the self-(healing/sealing) agents individually and as a combined medium on the mechanical properties of fresh concrete, the hydration kinetics, and early and final setting times, as well as strength and microstructure development over time. In addition, the effects of self-(healing/sealing) agents on hardened concrete were investigated to determine whether or not capsule rupture in response to a crack would have a detrimental effect on concrete properties in the area surrounding the crack. The results showed that self-(healing/sealing) agents such as sodium citrate greatly influenced hydration kinetics when the concentration exceeded 0.05% of the cement mass. Although the self-(healing/sealing) agents at 0.5% by binder mass retarded lightly of setting time, they had little negative effect on either 3- or 28-day strength. Calcium acetate, the dominant self-(healing/sealing) agent, acts as an accelerator while other components of the medium can have detrimental effects on the properties of fresh and hardened concrete. However, provided the quantity of self-healing/sealing agents released is below a certain threshold, it is unlikely that any detrimental effects will limit the application of bacterial self-healing/sealing concrete. Stage two included applying the main components of the self-sealing agents (calcium lactate and yeast extract) with the ingredients of the mortar mix and as a combined medium with mortar mix (two-stage bio-concrete/mortar) to investigate the ability of B. cohnii, B. halodurans and B. pseudofirmus to induce calcite precipitation through the cracks. The results showed that the sealing materials using each one of the three bacteria with the main components of self-sealing agents were very weak and were not distributed along the crack. Moreover, the primary components of self-sealing agents in 5% bio-cement mortar of the combined medium by binder mass distributed in entire samples were unable to seal cracks. Results showed that the samples dissolved in water, meaning that with more self-healing agent (SHA-1) ingredients added to the bio-mortar, the weaker and more ineffective it was with cement. Remediating cracks of hardening concrete with three different types of bacteria (B. cohnii, B. halodurans, and B. pseudofirmus) was performed during Stage three. Factors affecting the quantity and quality of healed materials included start and end healing time, the growth of each bacterium, and the viability of each bacterium in alkaline environment, all of which were also studied experimentally. Results showed that the three bacteria can produce calcium carbonate in a self-healing/sealing process, although B. pseudofirmus is the most suitable, efficient, and economical for remediating concrete cracks. The delivery of bacteria spores inside the concrete environment has always been the most challenging task. The main objective of stage four is to study the possibility of using successful previous delivery system used to remediate concrete cracks by using mineral agent to be used as delivery systems of bacteria spores. This study investigated three different encapsulate techniques within cement mortar namely calcium alginate beads (CAB), vascular tubes, and perlite. Results showed that CAB is very weak and very light due to low density, which cause decrease in their size, floating on the surface of mortar and poor distribution in mortar matrix. In spite of some passive mode effect variables such as tube length and diameter, the viscosity of bacteria solutions and their agents (SHA) and the ability of the glass tube to resist internal stresses were investigated. The results showed there was not enough data to demonstrate its ability to heal cracks. The mechanical and physical properties of uncoated and coated perlite, the ability of perlite to carry bacteria and its SHA, and the ability of bacteria and its SHA to form calcite out of perlite were investigated. The results demonstrated the ability of perlite to inoculate bacteria and its SHA, and the ability of this system to heal cracks. It is clear from the above perlite is the most suitable delivery system.
2
Wu, Dongxia. "Experimental and numerical study on passive building envelope integrated by PCM and bio-based concrete". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0104.
Abstract (sommario):
Les économies d'énergie et la réduction des émissions des gaz à effet de serre dans le secteur du bâtiments ainsi que le maintien d’un confort hygrométrique prennent une importance majeur ces dernières décennies. L'utilisation de matériaux à changement de phase (MCP) ou de matériaux hygroscopiques d'origine végétale pour l'enveloppe des bâtiments est une solution prometteuse. Les MCP conduit à améliorer le confort thermique intérieur et à réduire la consommation d'énergie, tandis que les matériaux hygroscopiques biosourcés sont des matériaux respectueux de l'environnement et permettent la régulation de l'humidité intérieure et assure une isolation thermique optimale. Cependant, seules quelques études ont exploré l'application l’intégration de ces deux types de matériaux et analysé de manière exhaustive les performances énergétiques et hygrothermiques. Cette thèse propose une solution d'enveloppe passive qui intègre le PCM et le béton de chanvre biosourcé pour améliorer simultanément les performances énergétiques, et hygrothermiques du bâtiment. Les principaux objectifs de cette étude sont d'examiner la faisabilité des enveloppes intégrées, d'étudier de manière exhaustive les performances hygrothermiques et énergétiques ainsi que les avantages et les inconvénients de différentes configurations avec le PCM placé à différents endroits du béton de chanvre.Tout d'abord, des expériences ont été menées en comparant les performances hygrothermiques d'une enveloppe de référence (béton de chanvre uniquement) et de trois enveloppes intégrées avec du MCP placé à différents endroits dans deux conditions limites typiques. Les résultats ont montré la faisabilité des enveloppes intégrées. La présence de PCM a augmenté les inerties thermique et hygrique de l'enveloppe. Par conséquent, le déphasage a été augmenté et l'amplitude de la température et de l'humidité relative a été réduite. Les différentes configurations présentaient des avantages et des inconvénients différents. La configuration dans laquelle le MCP est placé au milieu du béton de chanvre est intéressante car elle présente une faible fluctuation et un dephasage interessant à la fois pour les variations de la température et de l'humidité relative, et conduit ainsi à de grandes économies d'énergie.Ensuite, le modèle physique i, de transfert de la chaleur et de l’humidité, à l’échelle de l'enveloppe a été développé. Ce modèle intègre la dépendance de la température et de la caractéristique hygroscopique du béton de chanvre. La précision du modèle a été validée par comparaison avec les données expérimentales. Sur la base du modèle validé, les simulations ont été effectuées dans un climat méditerranéen afin d'étudier de manière exhaustive les performances hygrothermiques et énergétiques de l'enveloppe intégrée. Les résultats ont mis en évidence le rôle indispensable du transfert d'humidité dans la détermination de la charge hugrothermique, ainsi que l'effet précieux de l'enveloppe sur l'amélioration des performances énergétiques et hygrothermiques. En outre, l'enveloppe intégrée avec le PCM proche de (mais pas en contact avec) l'intérieur a montré un grand potentiel pour économiser de l'énergie et s'adapter aux variations d'humidité du climat tout en garantissant l'équilibre de l'humidité dans le béton de chanvre. Enfin, l'analyse paramétrique a été réalisée du point de vue des propriétés du MCP (épaisseur, chaleur latente et plage de transition de phase), et le risque d'application (condensation et développement de moisissures) a été évalué. Les résultats de l'analyse paramétrique ont montré que les performances de l'enveloppe pouvaient être améliorées en augmentant l'épaisseur et la chaleur latente de MCP et en identifiant la plage de transition de phase appropriée du MCP. Les résultats de l'évaluation des risques ont confirmé que l'enveloppe ne présentait aucun risque de condensation et de développement de moisissuresWith the development of society, the demand for energy saving and carbon emission reduction in buildings as well as the indoor thermal and humidity environment comfort is gradually increasing. Using Phase change materials (PCMs) or bio-based hygroscopic materials as building envelopes are promising solutions. PCMs can improve indoor thermal comfort and reduce energy consumption, while bio-based hygroscopic materials are environment-friendly materials that enable indoor humidity regulation and thermal insulation. However, only a few studies have explored the integrated application of the two types of materials and comprehensively analyzed the energy and hygrothermal performance. This dissertation proposed a passive envelope solution that integrates PCM and bio-based hemp concrete (HC) to simultaneously improve the energy, thermal, and hygric performances of buildings. The main objectives of this study are to investigate the feasibility of the integrated envelopes, to comprehensively study the hygrothermal and energy performance as well as the advantages and disadvantages of different configurations with PCM placed in different locations of the HC, and to conduct the parametric analysis and evaluate the application risks of the integrated envelope.First, experiments were conducted by comparing the hygrothermal performance of a reference envelope (HC only) and three integrated envelopes with PCM placed in different locations under two typical boundary conditions. The results demonstrated the feasibility of the integrated envelopes. The presence of PCM increased the thermal and hygric inertia of the envelope. As a result, the time delay was increased and the temperature/relative humidity amplitude was decreased. Different configurations had different advantages and disadvantages. The configurations with PCM placed in the middle of the HC was worth noting as it had small temperature/relative humidity fluctuation, long temperature time delay, and large energy savings.Then, the mathematical model of the integrated envelope that couples heat and moisture transfer and considers the temperature dependence of HC’s hygroscopic characteristic was developed. The accuracy of the model was validated by comparison with the experimental data. Based on the validated model, the simulations were performed in a Mediterranean climate to comprehensively investigate the hygrothermal and energy performance of the integrated envelope. The results highlighted the indispensable role moisture transfer plays in determining the indoor hygric environment and heat load, as well as the valuable effect of the integrated envelope on improving both energy and hygrothermal performance. Besides, the integrated envelope with PCM close to (but not in contact with) the interior showed great potential for saving energy and adapting to climate humidity variation while guaranteeing moisture equilibrium within the HC.Finally, the parametric analysis was performed from the perspective of PCM properties (thickness, latent heat, and phase transition range), and the application (condensation and mold growth) risk was evaluated. The results of the parametric analysis illustrated that the performance of the integrated envelope could be improved by increasing the thickness and latent heat and identifying the appropriate phase transition range of the PCM. The risk evaluation results confirmed that the integrated envelope was free from the risk of condensation and mold growth
3
Seng, Billy. "Etude expérimentale et numérique du comportement hygrothermique de blocs préfabriqués en béton de chanvre". Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30153.
Abstract (sommario):
Le béton de chanvre est un matériau de construction biosourcé pouvant répondre aux problématiques environnementales actuelles. Utilisé comme matériau de remplissage avec une bonne capacité isolante, il possède également la capacité de réguler l'humidité relative intérieure. Son comportement hygrothermique complexe résulte notamment de performances thermiques et hydriques interdépendantes. La prédiction de ces effets est réalisée à l'aide de modélisation et simulation de transferts hygrothermiques. Toutefois, l'utilisation de données d'entrée les plus représentatives possibles de la réalité est nécessaire. Les méthodes de caractérisation courantes ont souvent été développées pour des matériaux conventionnels et peuvent montrer des limites dans le cas de matériaux biosourcés. L'objectif principal de ces travaux est de déterminer les propriétés hygrothermiques d'un bloc de béton de chanvre préfabriqués à l'échelle industrielle, de mieux appréhender cette caractérisation et de décrire son comportement hygrothermique via des simulations numériques. Le matériau étudié est formulé à partir d'un liant pouzzolanique et de granulats de chènevotte. Une partie de ce travail de thèse a donc porté sur la caractérisation des propriétés physiques, thermiques et hydriques du béton de chanvre étudié ainsi que sur les méthodes de mesure. Pour chaque paramètre hygrothermique étudié, plusieurs méthodes ont été confrontées afin d'en évaluer l'impact. Dans la mesure du possible, l'influence de la température et de l'humidité sur les différents paramètres a également été estimée. Un modèle de transferts hygrothermiques est proposé avec une évaluation d'ordre de grandeur dans le cas du béton de chanvre à partir des propriétés de la littérature. Ce modèle est appliqué à une étude expérimentale à l'échelle de la paroi, dans une enceinte bi-climatique, mettant en avant l'impact de la sorption et du changement de phase sur les transferts de chaleur. En ce qui concerne les propriétés thermiques, l'étude expérimentale à l'échelle du matériau met en évidence l'impact significatif du protocole expérimental sur le résultat de mesure, en particulier pour la chaleur massique. Pour les propriétés hydriques, les essais mettent en avant l'intérêt de réaliser une étude paramétrique de type round-robin sur les matériaux biosourcés. [...]Hemp concrete is a bio-based construction material able to meet current sustainable issues. Used as filling and insulating material, it has the capacity to regulate the indoor relative humidity. Its complex hygrothermal behavior results on interdependent thermal and hydric performances. The prediction of the hygrothermal effect is performed through heat and moisture transfer modeling and simulation. However, the use of representative inputs is necessary. Standard characterization methods have often been developed for usual building material and can show some limitations in the case of bio-based material. The main objective of these works is to determine the hygrothermal properties of a precast hemp concrete produced at industrial scale, have a better understanding of this characterization and describe its hygrothermal behavior through numerical simulations. The studied material is based on pozzolanic binder and hemp aggregates. One part of this work deals with the characterization of the physical, thermal and hydric properties of the studied material and with the measurement methods. For each hygrothermal properties, several methods have been confronted. If possible, the temperature and humidity influences have been appraised. A heat and moisture transfer model is proposed with a scale analysis based on hemp concrete properties from the literature. This model has been applied to wall scale experiments highlighting the impact of sorption and phase change phenomena on the heat transfers. With regards to the thermal properties, the experimental study at material scale highlights the significant impact of the experimental protocol on the result of the measure, particularly for the specific heat capacity. For hydric properties, the studies put forward the interest of performing a parametric round-robin test dedicated to bio-based materials. An air permeability measurement protocol designed for regular concrete has been adapted in order to evaluate the performance of a very permeable material such as the hemp concrete. The numerical model is validated on a test from a standard and a test from the literature. It manages to describe test with usual ambient solicitations performed in the bi-climatic chamber
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Bouchikhi, Aurélie. "Contribution à la formulation d’un béton végétal structurel à base cimentaire incorporant des co-produits / déchets de bois". Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2019. http://www.theses.fr/2019MTLD0009.
Abstract (sommario):
Le bâtiment est un secteur particulièrement émissif en gaz à effet de serre. Pour tenter de réduire l’impact des matériaux sur l’environnement, de nombreuses recherches visent à étudier différentes alternatives pour limiter l’épuisement des ressources, la consommation d’énergie et le rejet de composés polluants. Dans ce contexte, les bétons biosourcés se positionnent comme une alternative sérieuse au béton traditionnel, avec une empreinte carbone plus faible.Cette thèse industrielle, portée par l’entreprise ALKERN, leader en France et en Belgique de produits préfabriqués en béton, a pour objectif de contribuer à la formulation d’un béton végétal incorporant des co-produits / déchets de bois structurel à impact environnemental plus faible que le Naturbloc®, un bloc actuellement sur le marché. Ce dernier produit est constitué de granulats de bois minéralisé puis introduit dans une matrice cimentaire.Ce travail s’articule en trois volets. Les bois témoin (non traité) et de référence (minéralisé) ont d’abord été caractérisés. Dans un second temps, des traitements alternatifs à la minéralisation du bois ont été testés et caractérisés, notamment au regard de leur reprise en eau et leur aptitude à relarguer ou contenir les extractibles présents dans les végétaux. Leur compatibilité avec une matrice cimentaire a également été évaluée. Il a ainsi pu être mis en évidence que la nature du substrat influence les résultats et l’interaction des granulats avec la pâte cimentaire.Enfin, le bois traité a été introduit dans la matrice cimentaire témoin et dans une matrice alternative à plus faible impact environnemental. Cette dernière a été obtenue soit par un changement de liant, soit par une adjuvantation spécifique du béton. L’ensemble des résultats montrent qu’il existe un lien direct entre les propriétés physico-chimiques des granulats et les performances mécaniques obtenues pour le bétonThe construction industry produces a high amount of greenhouse gases. In order to reduce the impact of materials on the environment, a lot of researches are focused on the study of different alternatives to limit the exhaustion of resources, the energy consumption and the rejection of polluting compounds. In this context, bio-based concrete seem to be a serious alternative to traditional concrete, with a lower carbon footprint.The aim of this industrial thesis, supported by the company ALKERN, leader in France and in Belgium for precast concrete products, is to contribute to the formulation of structural green concrete incorporating co-products / wood waste with an environmental impact lower than the Naturbloc®, a block already available on the market. This last product is made of wood aggregates mineralized and then introduced in a cementitious matrix.This work is divided into three parts. Firstly, the control wood (untreated) and reference wood (mineralized) were characterized. Then, alternative treatments to replace cement coating of wood were tested and characterized, especially in terms of water uptake and ability to leach or hold the extractives present in vegetables back. Their compatibility with a cementitious matrix was also evaluated. The study highlights the fact that the nature of the substrate has an influence on the results and on the interaction between aggregates and cementitious paste.Finally, treated wood was introduced into a cementitious matrix and in an alternative matrix with a lower environmental impact. The latter was obtained either by change of the binder or by use of additives in bio-based concrete. All the results show the existence of a direct link between physico-chemical properties of aggregates and mechanical performances of concrete
Libri sul tema "Bio-Based concrete":
1
Arnaud, Laurent, e S. Amziane. Bio-Aggregate-Based Building Materials: Applications to Hemp Concretes. Wiley & Sons, Incorporated, John, 2013.
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Arnaud, Laurent, e Sofiane Amziane. Bio-Aggregate-based Building Materials: Applications to Hemp Concretes. Wiley & Sons, Incorporated, John, 2013.
3
Arnaud, Laurent, e Sofiane Amziane. Bio-Aggregate-based Building Materials: Applications to Hemp Concretes. Wiley & Sons, Limited, John, 2013.
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Arnaud, Laurent, e Sofiane Amziane. Bio-Aggregate-based Building Materials: Applications to Hemp Concretes. Wiley & Sons, Incorporated, John, 2013.
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Arnaud, Laurent, e Sofiane Amziane. Bio-Aggregate-based Building Materials: Applications to Hemp Concretes. Wiley & Sons, Incorporated, John, 2013.
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Collet, Florence, e Sofiane Amziane. Bio-aggregates Based Building Materials: State-of-the-Art Report of the RILEM Technical Committee 236-BBM. Springer, 2018.
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Collet, Florence, e Sofiane Amziane. Bio-aggregates Based Building Materials: State-of-the-Art Report of the RILEM Technical Committee 236-BBM. Ingramcontent, 2017.
Capitoli di libri sul tema "Bio-Based concrete":
1
Partschefeld, Stephan, e Andrea Osburg. "Bio-Based Superplasticizers for Cement-Based Materials". In International Congress on Polymers in Concrete (ICPIC 2018), 77–82. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78175-4_7.
2
Bardouh, Rafik, Omayma Homoro e Sofiane Amziane. "Reinforced Bio-Based Concrete by Natural FRCM". In RILEM Bookseries, 601–12. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33465-8_46.
3
Tziviloglou, Eirini, Kim Van Tittelboom, Damian Palin, Jianyun Wang, M. Guadalupe Sierra-Beltrán, Yusuf Çagatay Erşan, Renée Mors et al. "Bio-Based Self-Healing Concrete: From Research to Field Application". In Self-healing Materials, 345–85. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/12_2015_332.
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Obeid, Maya Hajj, Omar Douzane, Lorena Freitas Dutra, Geoffrey Promis, Boubker Laidoudi e Thierry Langlet. "Mechanical and Thermal Properties of an Innovative Bio Based Concrete". In RILEM Bookseries, 63–69. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33465-8_6.
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Chaudhari, Ojas, Giedrius Zirgulis, Isra Taha e Dag Tryggö. "Evaluation of Eco-friendly Concrete Release Agents Based on Bio-Waxes". In International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures, 570–80. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33211-1_51.
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Shamas, Youssef, H. C. Nithin, Vivek Sharma, S. D. Jeevan, Sachin Patil, Saber Imanzadeh, Armelle Jarno e Said Taibi. "Toughness and Ultimate Compressive Strength of Bio-Based Raw Earth Concrete". In RILEM Bookseries, 310–23. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-33465-8_25.
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Raman, Sudharshan N., H. M. Chandima C. Somarathna, Azrul A. Mutalib, Khairiah H. Badri e Mohd Raihan Taha. "Bio-Based Polyurethane Elastomer for Strengthening Application of Concrete Structures Under Dynamic Loadings". In International Congress on Polymers in Concrete (ICPIC 2018), 751–57. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78175-4_96.
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Betts, Dillon, Pedram Sadeghian e Amir Fam. "Experimental Behaviour of Concrete Confined with Unidirectional Flax Fiber-Reinforced Bio-Based Polymers". In 8th International Conference on Advanced Composite Materials in Bridges and Structures, 147–54. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09632-7_17.
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Santos, Marina, João P. Firmo, João R. Correia, Mário Garrido, Mateus Hofmann, Ana Lopez, João Tonnies, João C. Bordado, Filipe Dourado e Inês C. Rosa. "Bio-Based Carbon Fibre Reinforced Polymer Laminates for Strengthening of Concrete Structures: Material Characterization, Bond to Concrete and Structural Tests". In Lecture Notes in Civil Engineering, 1200–1209. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-32519-9_121.
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Glé, Philippe, Emmanuel Gourdon e Laurent Arnaud. "Acoustical Properties of Hemp Concretes". In Bio-aggregate-based Building Materials, 243–66. Hoboken, NJ 07030 USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118576809.ch7.
Atti di convegni sul tema "Bio-Based concrete":
1
Mohamad, Abdelrahman, Fouzia Khadraoui, Nassim Sebaibi, Mohamed Boutouil e Daniel Chateigner. "Water Sensitivity of Hemp-Foam Concrete". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.135.
Abstract (sommario):
The necessity to build energy-efficient and low environmental impact buildings favors the development of biobased light-weight materials as hemp-foam concretes. In this context, experimental protocols were developed to study the effects of hemp shiv and the production methods on the water sensitivity of bio-based foamed concrete (BBFC). Foam concrete incorporates several materials and compounds: cement, protein-based foaming agent, ground granulated blast–furnace slag, metakaolin as a binder, and hemp shiv as bio-based aggregates. The study investigated first the effect of the incorporation of hemp shiv (from 0 to 15 vol%) and then the elaboration method, comparing direct method versus preformed method on the resulting physical properties, the isotherms sorption-desorption and the capillary water absorption of hemp-foam concretes. We observe an increasing porosity of the concrete with hemp shives content. Additionally, hemp shives increase the adsorption and the capillary absorption of water. Moreover, the preformed method produces concretes more sensitive to water than the direct methods since it increases its porosities.
2
Caldas, Lucas Rosse, Carolina Goulart Bezerra, Francesco Pittau, Arthur Araujo, Mariana Franco, Nicole Hasparyk e Romildo Dias Toledo Filho. "Development of GHG Emissions Curves for Bio-Concretes Specification: Case Study for Bamboo, Rice Husk, and Wood Shavings Considering the Context of Different Countries". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.428.
Abstract (sommario):
Bio-concretes are receiving special attention in recent research as an alternative for climate change mitigation due to their low carbon footprints. Different bio-based materials can be used, e.g., wood shavings, bamboo, rice husk, and coconut. However, various methodological parameters can influence the carbon footprint of bio-based materials, especially bio-concretes, like biogenic carbon, amount of carbon in dry matter, rotation period of bio-aggregates, and type of cementitious materials. It is important to have easier ways of estimating the carbon footprint of bio-concretes, using parameters and data easily available. This research aims to evaluate the (1) carbon footprint of different mixtures of three bio-concretes (wood bio-concrete - WBC, bamboo bio-concrete - BBC and rice husk bio-concrete - RBC), and the (2) development of GHG emissions curves for bio-concretes specification based on easily available data (such as density, biomass content, and compressive strength). Based on experimental data, the carbon footprint was performed using the Life Cycle Assessment (LCA) methodology. In order to extend the findings of this study, the context of the following four countries was evaluated: Brazil, South Africa, India, and China. In addition, the replacement of Portland cement for Supplementary Cementitious Materials (SCMs) are evaluated hypothetically. The results show that the increase of biomass content in bio-concretes and the replacement of Portland cement by SCMs leads to a radical decrease in life cycle GHG emissions. The percentage of carbon in biomass is a critical factor for reducing the carbon footprint. The WBC was the biomass that performed better for this parameter. The presented GHG emissions curves can be a useful way to estimate the carbon footprint of bio-concretes and can be adapted to other kinds of bio-concretes and countries.
3
Vrzáň, Jakub. "Concrete with Bio-Based Aggregates". In Juniorstav 2024. Brno: Brno University of Technology, Faculty of Civil Engineering, 2024. http://dx.doi.org/10.13164/juniorstav.2024.24072.
4
Aguiar, Amanda Lorena Dantas, M’hamed Yassin Rajiv da Gloria e Romildo Dias Toledo Filho. "Influence of High Temperatures on the Mechanical Properties of Wood Bio-Concretes". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.61.
Abstract (sommario):
The use of wood wastes in the production of bio-concrete shows high potential for the development of sustainable civil construction, since this material, in addition to having low density, increases the energy efficiency of buildings in terms of thermal insulation. However, a concern arising from the production of bio-concretes with high amounts of plant biomass is how this material behaves when subjected to high temperatures. Therefore, this work aims to evaluate the influence of high temperatures on the mechanical properties of wood bio-concretes. The mixtures were produced with wood shavings volumetric fractions of 40, 50 and 60% and cementitious matrix composed of a combination of cement, fly ash and metakaolin. Uniaxial compression tests and scanning electron microscopy (SEM) were performed, with bio-concrete at age of 28 days, at room temperature (reference) and after exposure to temperatures of 100, 150, 200 and 250 °C. The density and compressive strength of the bio-concrete gradually decreased with increasing biomass content. Up to 200 °C, reductions in strength and densities less than 19% and 13%, respectively, were observed. At 250 °C, reductions of compressive strength reached 87%. Analysis performed by SEM showed an increase in the number of cracks in the wood-cementitious matrix interface and wood degradation by increasing the temperature.
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El Moussi, Youssef, Laurent Clerc e Jean-Charles Benezet. "Study of the Impact of Rice Straw Particle Size on the Mechanical and Thermal Properties of Straw Lime Concretes". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.361.
Abstract (sommario):
The use of bio-based concretes performed with lignocellulosic aggregates constitute an interesting solution for reducing the energy consumption, greenhouse gas emissions and CO2 generated by the building sector. Indeed, bio-based materials could be used as an alternative of traditional materials such as expended polystyrene and mineral resources (e.g. glass and rock wools) for insulation. Furthermore, these bio-based concretes are known for their interesting insulation properties, indeed they allow to enhance thermal properties of buildings and enables moisture management which lead to design efficient building materials. For this purpose, bio-based concrete using rice straw as aggregate are studied in this present work. The impact of the characteristics of rice straw particle (particle size distribution, bulk density, and water absorption capacity, etc.) on both the mechanical and thermal properties of the bio-based concrete are investigated. Five formulations of rice straw concrete are examined, compared and then classified in terms of insulation properties and mechanical properties. The assessments are based on the measurement of density and thermal conductivity. The variation of compressive strength in function of the characteristics (mean particle length) of rice straw particle are assessed and discussed. The investigation covers also the porosity and density. Tests are also carried out on agricultural by-products with a view to highlight their chemical, physical and structural proprieties. The results show that the use of large particles with low water absorption capacity induce lighter concretes with the density between 339 and 505 kg/m3 and lead to a high compressive strength with a high mechanical deformability. Furthermore, it appears that an increase in the average length of rice straw particle lead to decrease of thermal conductivity of bio-based concretes. It varies from 0.062 to 0.085 W/(m.K).
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Audouin, Marie, Nicolas Philippe, Fabien Bernardeau, Mariann Chaussy, Sergio Pons Ribera, Patricia Bredy Tuffe, Antoine Gasparutto, Florian Chalencon, Laetitia Bessette e Pierre Bono. "Substitution of Synthetic Fibers by Bio-Based Fibers in a Structural Mortar". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.472.
Abstract (sommario):
The use of bio-based material is now widespread in insulation concrete, for example hemp concrete. The bio-based materials in concrete provide many advantages: lightness, sound and thermal insulation, hydrothermal regulation while contributing to a reduction in the environmental impact due to the carbon capture during the plant growth. The development of materials incorporating plant is therefore an important objective for the construction. The next step will be to introduce bio-based materials in structural mortars and concretes. The project FIBRABETON proposes to substitute synthetic or metallic fibers by natural fibers in screed and slab. After a selection of biomass on the resources availability, separation and fractionation are the key step in processing to obtain technical natural fibers. Bulk fiber shaping and packaging methods for easy handling and transportation are tested. Then, functionalization of technical natural fibers by physical & chemical treatments to improve the durability with cement paste is carried out. The second step concerns the introduction of treated or not treated fibers in mortar and concrete formulations. The variation of the nature of the biomass, fibers shape and dosage in concrete are studied. The workability, the compressive strength and withdrawal resistance are measured in order to obtain the best formulation parameters. The evolution of properties over time is also evaluated. The project FIBRABETON is carried out with ESTP, FRD and Vicat and is subsidized by ADEME, Grand Est region and FEDER.
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Bikoko, Theodore Gautier, Jean Claude Tchamba, Valentine Yato Katte e Divine Kum Deh. "Effects of 0-30% Wood Ashes as a Substitute of Cement on the Strength of Concretes". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.51.
Abstract (sommario):
To fight against the high cost and the increasing scarcity of cement and at the same time to reduce the CO2 greenhouse gases emission associated with the production of Portland cement, two types of wood ashes as a substitute of cement in the production of concretes were investigated. In this paper, we substituted cement by two types of species of wood ashes namely, avocado and eucalyptus ashes following the proportions ranging from 0% to 30 % on one hand, and on the other hand, we added these two types of species of wood ashes namely, avocado and eucalyptus ashes following the proportions ranging from 0% to 10 % by weight of cement in the concrete samples. After 7, 14 and 28 days of curing, compressive strength tests were conducted on these concrete samples. The findings revealed that using wood ashes as additives/admixtures or as a substitute of cement in the production/manufacturing of concrete decreased the compressive strength of concrete. Hence, it can be said that wood ash has a negative influence on the strength of concrete. At three percent (3%) and ten percent (10%) of addition, the wood ash from eucalyptus specie offers better resistance compared to the wood ash from avocado specie, whereas at five percent (5%) of addition, the wood ash from avocado specie offers better resistance compared to the wood ash from eucalyptus specie. At thirty percent (30%) of substitution, the wood ash from eucalyptus specie offers better resistance compared to the wood ash from avocado specie. The compressive strengths increase with the increase of curing age.
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Dvorkin, Leonid I., Vadim Zhitkovsky, Nataliya Lushnikova e Mohammed Sonebi. "Comparative Study of Metakaolin and Zeolite Tuff Influence on Properties of High-Strength Concrete". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.179.
Abstract (sommario):
Composite admixtures which include active pozzolanic components and high-range water reducers, allows to obtain high-strength, particularly dense and durable concrete to achieve a reduction in resources and energy consumption of manufacturing.Zeolite, containing a significant amount of active silica, can serve as one of the alternative substances to resources and energy consuming mineral admixtures like metakaolin and silica fume. The deposits of zeolites are developed in Transcarpathia (Ukraine), USA, Japan, New Zealand, Iceland and other countries. It is known that zeolite tuffs exhibit pozzolanic properties and are capable to substitution reactions with calcium hydroxide.However, the high dispersion of zeolite rocks leads to a significant increase in the water consumption of concrete. Simultaneous introduction of zeolite tuffs with superplasticizers, which significantly reduce the water content, creates the preconditions for their effective use in high-strength concrete.Along with dehydrated (calcined) zeolite, natural (non-calcined) zeolite expresses itself as an effective mineral admixture of concrete. When using non-calcined zeolite, the effect of increasing in compressive strength at the age of 3 and 7 days is close to the effect obtained when using dehydrated zeolite: 8-10% and 10- 12%, respectively, and 28 days the strength growth is 13-22%. The use of non-calcined zeolite has a significant economic feasibility, so it certainly deserves attention. There were compared the effect of zeolite to metakaolinThe results of the research indicate that the use of composite admixtures, consisted of calcined (non-calcined) zeolite tuff of high dispersity and superplasticizer of naphthalene formaldehyde type, allows to obtain concretes classes C50…C65.
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Ratsimbazafy, Herinjaka Haga, Aurélie Laborel-Préneron, Camille Magniont e Philippe Evon. "Comprehensive Characterization of Agricultural By-Products for Bio-Aggregate Based Concrete". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.77.
Abstract (sommario):
The valorization of available agricultural by-products is important for the development of bio-aggregate based concretes as eco-friendly solutions for building materials. However, their diversity requires to assess their potential of use in vegetal concretes. This study aims to propose simple and relevant multi-physical characterization methods for plant aggregates. Basic and complementary characterizations were carried out on hemp shiv as a reference plant aggregate, and nine by-products available in the South-West part of France, i.e., oleaginous flax shiv, sunflower pith and bark, coriander straw, wheat straw, wheat chaff, corn shuck, miscanthus stem and vine shoot. The basic characterizations performed were those recommended by the TC-RILEM 236 BBM, i.e., particle size distribution, bulk density, water absorption and thermal conductivity. Complementary characterizations have also been proposed, taking into account the possible environment of the binder and the vegetal concrete manufacturing method. The additional tests developed or adapted from previous research assess the following properties: the content of water-soluble compounds at pH 7 and 12, the dry density of plant aggregates compacted in wet state, the real water absorption after compaction and the compression behavior of these compacted aggregates. This complete characterization highlights the distinct behavior of the different agroresources and allows to correlate these characteristics to the use properties of hardened composites.
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Khatib, J., Ali Hussein Jahami, Mohammed Sonebi e Adel Elkordi. "Shear Behavior of Bamboo Reinforced Concrete Beams". In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.730.
Abstract (sommario):
This research work aimed to study the usage of Bamboo strips as shear reinforcement in reinforced concrete (RC) beams. Four beams were considered in this study. The flexural reinforcement for all beams was the same. As for shear reinforcement, one beam was reinforced with conventional shear reinforcement with spacing (s=180 mm), while the other three beams were reinforced with bamboo strips with three different spacings (s=180 mm, s= 90 mm, and s=60 mm). The beams were subjected to a four-point bending test to plot the load-deflection curve for each beam. Results showed that the beam reinforced with bamboo strips spaced at 180 mm has 30% higher shear capacity than the beam with conventional shear reinforcement at the same spacing. Also, as the spacing of bamboo strips decreased, the shear capacity of beams increased nonlinearly.
Rapporti di organizzazioni sul tema "Bio-Based concrete":
1
Patel, Reena. Complex network analysis for early detection of failure mechanisms in resilient bio-structures. Engineer Research and Development Center (U.S.), giugno 2021. http://dx.doi.org/10.21079/11681/41042.
Abstract (sommario):
Bio-structures owe their remarkable mechanical properties to their hierarchical geometrical arrangement as well as heterogeneous material properties. This dissertation presents an integrated, interdisciplinary approach that employs computational mechanics combined with flow network analysis to gain fundamental insights into the failure mechanisms of high performance, light-weight, structured composites by examining the stress flow patterns formed in the nascent stages of loading for the rostrum of the paddlefish. The data required for the flow network analysis was generated from the finite element analysis of the rostrum. The flow network was weighted based on the parameter of interest, which is stress in the current study. The changing kinematics of the structural system was provided as input to the algorithm that computes the minimum-cut of the flow network. The proposed approach was verified using two classical problems three- and four-point bending of a simply-supported concrete beam. The current study also addresses the methodology used to prepare data in an appropriate format for a seamless transition from finite element binary database files to the abstract mathematical domain needed for the network flow analysis. A robust, platform-independent procedure was developed that efficiently handles the large datasets produced by the finite element simulations. Results from computational mechanics using Abaqus and complex network analysis are presented.