再生黏土砖骨料含量对透水混凝土性能的影响

发布时间：2018-11-18 07:28

【摘要】：为了探讨再生黏土砖骨料在透水混凝土中的应用问题,按总骨料中再生黏土砖骨料体积百分比不同配制了6组再生骨料,先对6组再生骨料的基本性能进行测试,再对6组再生骨料透水混凝土进行坍落度、密度、抗压强度、抗弯强度、弹性模量、孔隙率、渗透系数、抗冻性试验。分析试验数据得出:随着总骨料中再生黏土砖骨料体积百分比增加,透水混凝土的坍落度和密度逐渐减小;当总骨料中再生黏土砖骨料体积百分比超过40%,透水混凝土的力学性能出现不同幅度的下降;透水混凝土的渗透系数和孔隙率与总骨料中再生黏土砖骨料体积百分比基本上没有相关性;透水混凝土的强度损失率和质量损失率都随着总骨料中再生黏土砖骨料体积百分比增加而增大,而且当再生黏土砖骨料体积百分比大于40%时呈现出加速增大的趋势。结果表明:在天然骨料中掺加适量再生黏土砖骨料配制透水混凝土是可行的,其透水性基本保持不变,但是,当总骨料中再生黏土砖骨料体积百分比超过40%时,透水混凝土的力学性能和耐久性受到很大的影响。
[Abstract]:In order to discuss the application of recycled clay brick aggregate in permeable concrete, six groups of recycled aggregate were prepared according to the volume percentage of recycled clay brick aggregate in total aggregate. Then the slump, density, compressive strength, flexural strength, elastic modulus, porosity, permeability coefficient and frost resistance of 6 groups of recycled aggregate permeable concrete were tested. The experimental data show that the slump and density of permeable concrete decrease gradually with the increase of volume percentage of recycled clay brick aggregate in total aggregate. When the volume percentage of recycled clay brick aggregate in total aggregate exceeds 40, the mechanical properties of permeable concrete decrease by different extent. There is no correlation between permeability coefficient and porosity of permeable concrete and the volume percentage of recycled clay brick aggregate in total aggregate. The strength loss rate and mass loss rate of permeable concrete increase with the increase of aggregate volume percentage of recycled clay brick aggregate in total aggregate, and when the volume percentage of recycled clay brick aggregate is greater than 40, it shows a tendency of accelerating increase. The results show that it is feasible to add appropriate amount of recycled clay brick aggregate into natural aggregate to prepare permeable concrete, and its permeability remains basically unchanged. However, when the volume percentage of recycled clay brick aggregate in total aggregate exceeds 40%, The mechanical properties and durability of permeable concrete are greatly affected.
【作者单位】：长安大学建筑工程学院;
【基金】：国家自然科学基金项目(51579013)
【分类号】：TU528

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