温度、应变率对地质聚合物混凝土抗压强度的影响

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (17) : 197-202.

论文

温度、应变率对地质聚合物混凝土抗压强度的影响

王志坤1，许金余1，2，范建设3，苗华东3，刘远飞1

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The effects of temperature and strain rate on the compressive strength of geopolymeric concrete

Wang Zhikun1, Xu Jinyu1,2, Fan Jianshe3, Miao Huadong3, Liu Yuanfei1

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摘要

本文采用自主研制的高温SHPB试验系统，对高温条件下地质聚合物混凝土的动态抗压强度进行了试验研究。结果表明：200℃时地质聚合物混凝土的动态抗压强度较常温时有所增长，800℃时强度则急剧下降；应变率随弹速近似线性增长；同一弹速水平下，200-600℃时的应变率与常温接近，800℃时较常温提高明显；高温条件下，由侧向约束引起的附加应力可以忽略不计，试验所测得的动态强度增长因子（DIF）的应变率增强效应反应了材料的本质属性；在30-130 s-1应变率范围内，高温下地质聚合物混凝土的DIF与应变率的对数呈线性关系，且温度越高，应变率效应越明显。

Abstract

The dynamic compressive strength of geopolymeric concrete at elevated temperatures was investigated using a self-designed high temperature SHPB system. The results show that the dynamic compressive strength of geopolymeric concrete at 200℃ is higher than that at room temperature, but it decreases dramatically at 800℃. The strain rate increases approximately linearly with increasing projectile velocity. At a given projectile velocity, the strain rate changes slightly at 200-600℃ and increases evidently at 800℃ compared with that at room temperature. At elevated temperatures, the additional stress of geopolymeric concrete specimen caused by lateral confinement could be ignored, thus the strain rate effect on dynamic increase factor (DIF) obtained from test data can reflect the inherent nature of geopolymeric concrete. DIF increases with the logarithm of strain rate by linear approximation over the strain rate range of 30-130 s-1, and the strain rate effect is more obvious at high temperature.

导出引用

王志坤;许金余;范建设;苗华东;刘远飞. 温度、应变率对地质聚合物混凝土抗压强度的影响[J]. 振动与冲击, 2014, 33(17): 197-202

Wang Zhikun;Xu Jinyu;Fan Jianshe;Miao Huadong;Liu Yuanfei. The effects of temperature and strain rate on the compressive strength of geopolymeric concrete[J]. Journal of Vibration and Shock, 2014, 33(17): 197-202