干寒大温差环境下混凝土的抗裂性能、力学性能及气孔结构分析

发布时间：2018-01-28 04:38

本文关键词： 干寒大温差混凝土抗裂性抗压强度孔径分布　出处：《硅酸盐通报》2017年09期 　论文类型：期刊论文

【摘要】：试验研究了干寒大温差环境养护下的混凝土开裂过程、抗压强度及28 d龄期的孔径分布情况,分析了混凝土的初始开裂面积、气孔结构与抗压强度之间的关系,并与标准养护下的试验结果进行了对比分析。结果表明:在干寒大温差的养护条件下,混凝土的抗裂性能和力学性能更差,具体表现为初裂时间更短、初裂长度、初裂宽度更大、裂缝总条数更多;混凝土同龄期的抗压强度也较标准养护下要小,并与混凝土的初始开裂面积存在一定的相关性;孔径分布较标准养护下有一定的差异,主要表现为小孔径的孔更少,大孔径的孔更多,孔径分布朝着大孔径的方向移动;除此之外,水胶比也对混凝土的抗裂性、抗压强度和孔径分布有影响。
[Abstract]:Experimental study on dry concrete cracking process of cold curing under large temperature difference, pore size distribution and compressive strength of 28 d by the age of initial crack area of concrete, the relationship between pore structure and compressive strength test, and standard curing condition were analysed. The results showed that: in the dry curing conditions in a large temperature difference, crack resistance and mechanical properties of concrete is poor, the specific performance of the initial cracking time is shorter, initial crack length, the crack width is larger, the total number of more concrete cracks; age compressive strength is the standard maintenance period is smaller, and there is a certain correlation with the initial cracking area concrete; pore distribution is under standard curing have some differences, mainly for hole less small aperture, large pore size distribution more towards the large aperture direction; in addition, the coagulation water binder ratio The crack resistance, compressive strength and pore size distribution of soil are affected.

【作者单位】：兰州交通大学甘肃省道路桥梁与地下工程重点实验室;兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室;
【基金】：国家自然科学基金(51268032) 长江学者和创新团队发展计划滚动资助(IRT_15R29) 甘肃省基础研究创新群体(145RJIA332) 青年人才托举工程(2015QNRC001)
【分类号】：TU528
【正文快照】： 1引言混凝土是一种以胶凝材料、颗粒状集料等为原材料,按比例配料、拌合、成型,经硬化而形成的具有堆聚结构的人造石材[1]。作为目前最主要的建筑材料,其具有高强耐久,原材料丰富等优点,故被广泛应用了一个多世纪。然而,混凝土的各种性能却受到诸多因素的制约,不同条件下混凝

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