再生混凝土力学性能的应变率敏感性数值模拟

发布时间：2018-01-22 07:01

本文关键词： 再生混凝土力学性能应变率敏感性数值模拟再生粗骨料取代率　出处：《东南大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：基于九骨料模型再生混凝土建立了有限元模型,研究了再生混凝土力学性能的应变率敏感性以及细观相材料应变率敏感性对其的影响,并讨论了再生粗骨料取代率和新、老砂浆强度对再生混凝土应变率敏感性的影响.结果表明,该有限元模型能较好地模拟再生混凝土力学性能的应变率敏感性;再生混凝土峰值应力和弹性模量随着应变率的增大近乎线性增大,且弹性模量呈现更加均匀的增长趋势;相比骨料和界面过渡区,砂浆的应变率敏感性对再生混凝土整体应变率敏感性起主导作用;再生粗骨料取代率增大或新、老砂浆强度降低时,再生混凝土的弹性模量应变率敏感性增大,但它们对再生混凝土峰值应力应变率敏感性的影响有所不同.
[Abstract]:The finite element model of recycled concrete based on Nine aggregate model was established. The strain rate sensitivity of recycled concrete mechanical properties and the effect of strain rate sensitivity of mesophase materials on the strain rate sensitivity of recycled concrete were studied. The effects of recycled coarse aggregate replacement rate and new and old mortar strength on the strain rate sensitivity of recycled concrete are discussed. The results show that the finite element model can well simulate the strain rate sensitivity of recycled concrete mechanical properties. The peak stress and elastic modulus of recycled concrete increase linearly with the increase of strain rate, and the elastic modulus increases more uniformly. Compared with aggregate and interfacial transition zone, the strain rate sensitivity of mortar plays a leading role in the overall strain rate sensitivity of recycled concrete. The elastic modulus and strain rate sensitivity of recycled concrete increases when the replacement rate of recycled coarse aggregate increases or when the strength of old mortar decreases, but their effects on the sensitivity of peak stress-strain rate of recycled concrete are different.
【作者单位】：同济大学土木工程学院;香港理工大学建设与环境学院;
【基金】：国家杰出青年科学基金资助项目(51325802)
【分类号】：TU528
【正文快照】： 再生混凝土技术被认为是解决废混凝土问题的最有效措施之一.近年来,国内外大量学者对其进行了研究.许多研究表明,再生混凝土的强度和弹性模量等力学性能指标要低于相同水灰比的普通混凝土[1-3].Xiao等[4]总结了过去15年国内学者对再生混凝土的研究工作,包括再生混凝土的细微观

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