再生骨料透水混凝土力学性能和耐久性研究  

Study on Mechanical Properties and Durability Performance of Pervious Concrete Containing Recycled Aggregate

作　　者：张超[1,2] 任鹏鹏 邓鹏 诸子青[1] 高翔 郭帅成[1,2,3] ZHANG Chao;REN Pengpeng;DENG Peng;ZHU Ziqing;GAO Xiang;GUO Shuaicheng(College of Civil Engineering,Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education(Hunan University),Changsha 410082,China;Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province,Changsha 410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]建筑安全与节能教育部重点实验室(湖南大学),湖南长沙410082 [3]绿色先进土木工程材料及应用技术湖南省重点实验室,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2023年第3期185-194,共10页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划项目(2019YFC1904704);湖南大学大学生创新训练(SIT)计划项目(S202110532097,S202110532307)。

摘　　要：从优化水泥基体角度出发,搭配使用不同掺量的再生细骨料,旨在全面提升再生骨料透水混凝土力学性能、渗透性和耐久性.首先,采用单纯形重心设计法对水泥(C)、粉煤灰(FA)和硅灰(SF)组成的三元胶凝体系进行优化设计,获得高性能水泥基体.然后,分析了高性能水泥基体和再生骨料质量分数(0%、30%和50%)对透水混凝土力学性能和耐久性的影响.试验发现,使用高性能胶凝材料,可以显著提升再生骨料透水混凝土的抗压强度和冻融耐久性,且可满足渗透性要求.当再生骨料质量分数为0%、30%和50%时,28 d抗压强度分别提升72.4%、100%和44.2%;50次冻融循环质量损失分别为1.5%、2.2%和2.5%.此外,研究发现再生骨料透水混凝土的破坏模式与胶凝材料性能和再生骨料质量分数相关,可为再生骨料透水混凝土设计和应用提供参考.This study aims to comprehensively improve the mechanical properties,permeability and durability of the pervious concrete with recycled aggregate through optimization of cementitious matrix and adding recycled fine aggregate with different content.Firstly,the simplex-centroid design method was used to optimize the ternary cement⁃ing system composed of cement(C),fly ash(FA)and silica fume(SF),and the high-performance cementitious ma⁃trix is obtained.Then,the effects of high-performance cementitious matrix and recycled aggregate content(0%,30%and 50%)on mechanical properties and durability of pervious concrete were analyzed.The experimental results show that the compressive strength and freeze-thaw durability of pervious concrete with recycled aggregate can be sig⁃nificantly improved by using high-performance cementitious materials,and it can also meet the permeability require⁃ments.When the recycled aggregate content is 0%,30%and 50%,the 28 d compressive strength is increased by 72.4%,100%and 44.2%,respectively;the mass loss of 50 freeze-thaw cycles was 1.5%,2.2%and 2.5%,respec⁃tively.In addition,it is found that the failure mode of pervious concrete with recycled aggregate is related to the per⁃formance of cementitious material and the content of recycled aggregate,which can provide a reference for the design and application of pervious concrete with recycled aggregate.

关 键 词：高性能透水混凝土 再生骨料 力学性能 耐久性 渗透性 

分 类 号：TU411[建筑科学—岩土工程]