高延性地聚合物复合材料亚高温后力学性能研究  

Mechanical Properties of High-ductility Geopolymer Composite AfterSub-high Temperature

作　　者：杨彦东 卢博 田浩 卜剑冲 YANG Yandong;LU Bo;TIAN Hao;PU Jianchong(Technological Research Institute,Ningxia Electric Power Co.,Ltd.,Yinchuan 750004,China)

机构地区：[1]国网宁夏电力有限公司经济技术研究院,银川750004

出　　处：《材料导报》2024年第S01期185-190,共6页Materials Reports

摘　　要：高温是服役结构可能面临的荷载形式,无机纤维由于具有高温熔化特性,会影响高延性复合材料的高温力学性能。为了促进高延性地聚合物复合材料的实际应用,本工作通过开展单轴拉伸和压缩试验研究了其在经历20~200℃亚高温环境后的力学性能变化,并利用扫描电子显微镜分析了不同温度的微观结构,阐释了其力学性能变化机理。结果表明,当温度不超过100℃时,由于高温对地聚合物反应的促进作用,高延性地聚合物复合材料的拉伸强度、延性以及抗压强度随温度的升高逐渐增加。随温度的进一步升高,由于纤维的熔化效应,拉伸强度和延性逐渐降低;同时,高温蒸汽压的积累引起了更多微裂纹的生成,从而导致了抗压强度逐渐减小。高温有利于降低高延性地聚合物复合材料的拉伸裂缝宽度。High temperature is one loading type that the structures in service may suffer.The melting nature of inorganic fibers at high temperature will affect the mechanical properties of high-ductility composite after undergoing high temperature.To promote the practical application of high-ductility geopolymer composite,the mechanical properties after undergoing sub-high temperature environment of 20—200℃were studied by carrying out uniaxial tensile and compressive tests,and the microstructures at different temperatures were analyzed by scanning electron microscope to elucidate the variation mechanism of mechanical properties.The results show that due to the promotion of geopolymerization reaction by high temperature,the tensile strength,tensile ductility,and compressive strength gradually increased with the temperature increasing when the temperature was no more than 100℃.With the further increase in the temperature,the tensile strength and tensile ductility gradually decreased due to the melting effect of the fiber.Meanwhile,the accumulation of high temperature vapor pressure caused the formation of more micro-cracks,leading to a reduction in the compressive strength.High temperature favored the decrease in the width of the tensile crack.

关 键 词：亚高温 地聚合物 高延性 力学性能 微观机理 

分 类 号：TU528[建筑科学—建筑技术科学]