橡胶颗粒抑制蒸养混凝土热损伤机制  

Mechanism of rubber particles inhibit heat damage of steam-curing concrete

作　　者：安军林 于泳 金祖权[1] 张维东 AN Junlin;YU Yong;JIN Zuquan;ZHANG Weidong(Department of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266520

出　　处：《复合材料学报》2023年第5期2960-2971,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52178222);泰山学者工程专项经费(TS20190942)。

摘　　要：通过向蒸养混凝土中掺入橡胶颗粒制备蒸养橡胶混凝土来抑制蒸养过程中混凝土产生的热损伤。通过试验测试了蒸养橡胶混凝土的抗压强度;建立了考虑界面过渡区的橡胶混凝土随机骨料模型,基于ABAQUS,模拟研究了橡胶颗粒对降温阶段混凝土温度损伤应力的影响,从细观角度研究橡胶颗粒抑制蒸养混凝土中微裂纹发展规律,并将温度损伤应力作为初始缺陷,模拟了橡胶混凝土的抗压性能,验证了模拟结果的可靠性;通过压汞(Mercury intrusion porosimetry,MIP)测试研究了橡胶颗粒对蒸养混凝土孔结构的影响;通过超景深显微镜研究了橡胶与水泥石之间的结合情况。研究结果表明:橡胶颗粒掺入可以抑制蒸养混凝土的热损伤,减少强度损失。橡胶颗粒可以有效降低蒸养混凝土试件的总孔隙率,蒸养橡胶混凝土试件有害孔径较未掺加橡胶颗粒的普通蒸养混凝土下降了3.1%,同时改善了橡胶和水泥基体的粘结状况。The heat damage of steam-curing concrete was restrained by adding rubber particles into steam-curing concrete to prepare steam-curing rubber concrete.The compressive strength of steam-curing rubber concrete was tested through experiments.A random aggregate model of rubber concrete considering interface transition zone was established based on ABAQUS simulation.The influence of rubber particles on the temperature damage stress of concrete in the cooling stage was studied.The influence of rubber particles on the temperature damage stress of concrete at the cooling stage was studied.The development of microcracks in steam-curing concrete inhibited by rubber particles was studied from a microscopical point of view,and taking the temperature damage stress as the initial defect,the compressive property of rubber concrete was studied,and the reliability of the simulation results was verified.The effect of rubber particles on the pore structure of steam-curing concrete was studied by mercury intrusion porosimetry(MIP)test.The bond between rubber and cement was studied by an ultra-depth-of-field microscope.The results show that the addition of rubber particles can restrain heat damage and reduce the strength loss of steam-curing concrete.Rubber particles can effectively reduce the total porosity of steam-curing concrete specimens,and the harmful pore size of steam-curing rubber concrete decreases by 3.1%compared with that ordinary steam-curing concrete without adding rubber particles.Meanwhile,the bond between rubber and cement matrix is improved.

关 键 词：蒸养橡胶混凝土 数值模拟 热损伤 孔结构 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]