再生粗骨料混凝土硫酸盐侵蚀的损伤模型研究  

Study on sulfate damage model of recycled coarse aggregate concrete

作　　者：顾彦 耿欧 李大贺 GU Yan;GENG Ou;LI Dahe(Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering,School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221000,China)

机构地区：[1]中国矿业大学力学与土木工程学院江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221000

出　　处：《混凝土》2022年第2期34-37,共4页Concrete

基　　金：国家自然科学基金项目(51972337)。

摘　　要：据再生粗骨料混凝土超声声速和相对动弹性模量的关系,研究了在不同浓度硫酸钠(2%、5%、10%)和氯化钠-硫酸钠混合溶液(0、2%、5%、10%氯化钠+5%硫酸钠)浸泡环境中,不同粗骨料取代率水平(0、30%、50%、70%、100%)下的再生粗骨料混凝土硫酸盐侵蚀损伤的规律;利用复合函数拟合得到了不同硫酸盐溶液浸泡下再生粗骨料混凝土的损伤演化方程,分析了取代率、硫酸钠浓度和氯化钠浓度等因素对再生粗骨料混凝土损伤劣化的影响规律。Based on the relationship between ultrasonic velocity and relative dynamic modulus of elasticity of recycled coarse aggregate concrete,The rules of sulfate erosion damage of recycled coarse aggregate concrete were studied under different levels of coarse aggregate replacement rate(0,30%,50%,70%,100%)in soaking environment with different concentration of sodium sulfate(2%,5%,10%)and mixed solution of sodium chloride and sodium sulfate(0,2%,5%,10%sodium chloride+5%sodium sulfate).The damage evolution equation of recycled coarse aggregate concrete under different sulfate solution immersion was obtained by using composite function fitting,and the influence of factors such as coarse aggregate replacement rate,sodium sulfate concentration and sodium chloride concentration on the damage degradation of recycled coarse aggregate concrete was analyzed.

关 键 词：再生粗骨料混凝土 超声声速 相对动弹性模量 取代率 损伤演化方程 

分 类 号：TU528.01[建筑科学—建筑技术科学]