Topic
Mortar
About: Mortar is a research topic. Over the lifetime, 25024 publications have been published within this topic receiving 218739 citations.
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TL;DR: A comparative study of the microstructure of both new and in-use aged blast-furnace slag cement coir reinforced composite was performed in this article, where both internal and external walls of a 12-y...
Abstract: A comparative study of the microstructure of both new and in-use aged blast-furnace slag cement coir reinforced composite was performed. Aged samples came from internal and external walls of a 12-y ...
122 citations
TL;DR: In this article, the analysis of the bond between a cement-based fiber reinforced strengthening material and the concrete substrate is presented and discussed, and a comparison between experimental results and theoretical predictions of bond-slip law PBO-FRCM-to-concrete is made and discussed.
Abstract: The paper is devoted to the analysis, both experimental and theoretically, of the bond between a cement based fiber reinforced strengthening material and the concrete substrate. Results of tests on concrete specimens strengthened with the PBO-FRCM system, made by PBO (short of Polypara-phenilene-benzo-bisthiazole) fiber meshes embedded into a cementitious mortar (FRCM, Fabric Reinforced Cementitious Mortar), are presented and discussed. Tests were carried out varying both the bond length, the amount of the strengthening system and the service temperature. Obtained results furnish useful information (i) to determine the loss of bond between the PBO-FRCM system and the concrete, (ii) to define the failure modes and (iii) to evaluate both the influence of environmental conditions (service temperature) and mechanical and geometrical parameters on the loss of bond PBO-FRCM-to-concrete. Test results were, then, utilized to calibrate a local bond-slip relation. A comparison between experimental results and theoretical predictions of the bond-slip law PBO-FRCM-to-concrete is, finally, presented and discussed.
121 citations
TL;DR: In this paper, a double-layer model is proposed to explain the volume change behavior of mortar bars containing a reactive aggregate, and the expansion of the reaction-product gels is attributed to swelling caused by electrical double layer repulsive forces.
Abstract: An understanding of the expansion mechanisms resulting from alkali-silica reaction is necessary to assess the susceptibility of a concrete structure to deterioration by these processes and to the planning and implementation of preventive measures. As a result of the alkali-silica reaction between certain reactive aggregates and the highly alkaline pore fluids in a cement paste, a reaction-product gel develops that, in the presence of water, expands and may cause cracking of mortar or concrete. To explain the volume change behavior of mortar bars containing a reactive aggregate, a theoretical model is proposed in this paper. The expansion of the alkali-silica reaction-product gels is attributed to swelling caused by electrical double-layer repulsive forces. For a given colloidal system, double-layer theory indicates that the larger the valence of the counterions in the double layer, or the larger the concentration of these ions, the smaller the double-layer thickness and the repulsive forces that may be generated in the presence of water. Results of experiments from the literature support the double-layer model. According to these results, the expansion of mortar bars in the American Society for Testing and Materials (ASTM) C 1260 test is related to the composition of the reaction product gels. The reaction-product gels containing larger amounts of equivalent sodium oxide (Na2Oe) and smaller CaO/Na2Oe cause larger expansions in the mortar bars.
121 citations
TL;DR: In this article, the authors analyzed the maximum feasible replacement ratio of natural sand by recycled sand from masonry waste for mortar production and found that 50% can be achieved in mortar for indoor use, although specific studies to increase the workable life and decrease the shrinkage should be carried out before use.
121 citations
TL;DR: In this paper, the authors analyzed the influence of recycled aggregate on the failure shape of the recycled aggregate after loading and the internal properties of the aggregate that influence the strength of the concrete.
121 citations