Performance of refractory aluminosilicate particle/fiber-reinforced geopolymer composites
Performance of refractory aluminosilicate particle/fiber-reinforced geopolymer composites
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DOI：
10.1016/j.compositesb.2012.02.027
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发表时间：
2012-06-01
影响因子：
13.1
通讯作者：
Rodriguez, Erich D.
中科院分区：
文献类型：
--
作者：
Bernal, Susan A.;Bejarano, Julian;Rodriguez, Erich D.
本研究评估了暴露于高温后，用耐火铝硅酸盐颗粒和纤维增强的偏高岭土基地质聚合物的机械性能。抗压强度，收缩率和弯曲强度数据表明，包括耐火材料颗粒，无论有和没有额外的耐火纤维，促进改善暴露后的压缩和弯曲强度相比，没有增强的样品。暴露于600摄氏度和1000摄氏度之间的温度下的样品表现出减少的收缩，包括更高含量的颗粒和纤维，同时保持良好的机械强度。这种行为归因于在这些材料中实现的开裂控制，这有助于通过增强颗粒和基质之间的强相互作用的组合效应来增强它们的体积稳定性，从而导致裂纹偏转，以及在增加的暴露温度下基质-纤维界面的潜在致密化，从而提高最终复合材料的刚度。这些结果表明，偏高岭土基地质聚合物复合材料，如果设计与基质和填料特性之间的正确的兼容性，可以作为一种廉价的可浇注复合耐火材料。(C)2012爱思唯尔有限公司保留所有权利。
This study assesses the mechanical performance of metakaolin-based geopolymers reinforced with refractory aluminosilicate particles and fibers, after exposure to elevated temperatures. Compressive strength, shrinkage and flexural strength data reveal that the inclusion of refractory particles, both with and without additional refractory fibers, promotes improved post-exposure compressive and flexural strengths compared with samples without reinforcement. Specimens exposed to temperatures between 600 degrees C and 1000 degrees C exhibited reduced shrinkage with the inclusion of higher contents of particles and fibers, while retaining good mechanical strength. This behavior is attributed to the cracking control achieved in these materials, which contributes to the enhancement of their volumetric stability through the combined effect of a strong interaction between reinforcing particles and the matrix leading to crack deflection, and the potential densification of the matrix-fiber interface at increased exposure temperatures, rising the stiffness of the final composite. These results indicate that metakaolin-based geopolymer composites, if designed with the correct compatibility between matrix and filler characteristics, can act as an inexpensive castable composite refractory. (C) 2012 Elsevier Ltd. All rights reserved.