硫酸盐侵蚀与干湿循环下混凝土本构关系研究

发布时间：2018-01-10 07:05

本文关键词：硫酸盐侵蚀与干湿循环下混凝土本构关系研究　出处：《中国矿业大学学报》2017年01期 　论文类型：期刊论文

【摘要】：为了研究硫酸盐环境下混凝土单轴受压应力-应变关系,对质量分数为10%的Na_2SO_4,10%的MgSO_4溶液中干湿循环作用下的混凝土进行单轴受压试验,分析了硫酸盐溶液种类对混凝土峰值应力、峰值应变、弹性模量及应力-应变全曲线的影响,并对损伤层混凝土的力学性能进行分析.结果表明:混凝土应力-应变曲线随侵蚀时间增加呈现扁平,整体右移,硫酸镁溶液中侵蚀300d后损伤层应力-应变曲线上升段轻微上扬,并出现下凹现象.峰值应力在侵蚀前期下降缓慢,在侵蚀240d后快速下降;弹性模量呈现先增大,后降低趋势;峰值应变在侵蚀240d后快速增加,硫酸镁溶液中峰值应变增长较快.通过回归分析,建立了硫酸盐侵蚀与干湿循环作用下混凝土单轴受压应力-应变全曲线方程,并得到了损伤层混凝土应力-应变方程的确定方法.
[Abstract]:In order to study the concrete sulfate environment under uniaxial compressive stress-strain relationship, the uniaxial compression tests for wet and dry cycle MgSO_4 mass fraction of 10% Na_2SO_4,10% in the concrete, analyzes the types of concrete sulfate solution stress peak, peak strain, elastic modulus and stress strain curves, and the mechanical properties of damaged layer concrete is analyzed. The results show that the concrete stress-strain curve is flat, with erosion time increase the overall shift, after Magnesium Sulfate 300D solution erosion damage stress-strain curve segment increased slightly up, and the emergence of concave phenomenon. The peak stress decreased slowly in the erosion stage the rapid decline in erosion after 240d; the elastic modulus increased first, then decreased; the peak strain increases rapidly in the erosion of 240d, Magnesium Sulfate solution in the peak strain growthfaster. Through the back Based on regression analysis, the equation of stress-strain curve of concrete under the action of sulfate attack and dry wet cycling is established, and the method of determining stress-strain equation of damaged concrete is obtained.

【作者单位】：安阳师范学院建筑工程学院;西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金项目(51278403) 教育部创新团队发展计划(IRT13089)
【分类号】：TU528
【正文快照】： 我国地域宽广,硫酸盐分布广泛,在沿海地区和西部盐湖地区及其周边土壤、地下水中含有大量硫酸盐[1].硫酸盐环境中的侵蚀性离子进入混凝土内部,与水泥石中一些组分发生化学反应,生成膨胀性产物,并分解水泥石中的重要组分,造成混凝土开裂、剥落及强度下降,由表及里形成损伤层,最

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