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Influence of Elevated Temperatures on the Mechanical Behavior of Jute-Textile-Reinforced Geopolymers
A.C. Constâncio Trindade1, H.A. Alcamand2, P.H. Ribeiro Borges2, F. de Andrade Silva1
1 Department of Civil and Environmental Engineering, Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Brazil.
2 Department of Civil Engineering, Federal Center for Technological Education of Minas Gerais (CEFET-MG), Brazil.
received June 30, 2017, received in revised form July 28, 2017, accepted August 21, 2017
Vol. 8, No. 3, Pages 389-398 DOI: 10.4416/JCST2017-00045
Abstract
Geopolymers may present important structural and environmental advantages compared to Portland-cement-based materials. They can achieve high mechanical strength at early ages and exhibit much better thermal durability than Portland-cement-based materials. Geopolymers are brittle materials and an increasing number of studies have been conducted on the incorporation of fibrous reinforcement into these matrices in recent years. Natural fibers appear as a reinforcing group that imply environmental superiority, resulting in improved mechanical behavior. This study evaluates the mechanical behavior of metakaolin-based geopolymers reinforced with jute textile when these are exposed to elevated temperatures. The matrices were activated with a combination of sodium-hydroxide and sodium-silicate solutions. Distinctions in the mixtures were made with the incorporation of different aggregates, i.e. natural quartz sand and chamotte. Direct tensile and compression tests were performed to study the mechanical behavior of the geopolymers when these were exposed to elevated temperatures. In addition, direct tensile tests were conducted on the fibers in different temperature conditions. X-ray diffraction and scanning electron microscopy (SEM) were used to investigate the microstructural changes of the reinforcement. The results indicated superior behavior for the matrices and composites made with the refractory aggregate, indicating a fiber-matrix interaction suitable for this combination at elevated temperatures.
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Keywords
Geopolymers, composites, natural fibers, temperature
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