建筑垃圾再生砖混透水混凝土性能研究

Research on the Performance of Construction Waste Recycled Brick Mixed Pervious Concrete

建筑砖混垃圾的再利用有利于节约资源和保护环境,促进中国更快实现“双碳”目标。为研究水灰比和骨料粒径对再生砖混透水混凝土抗压强度和透水系数的影响,文章以水灰比(0.28~0.32)和骨料粒径(4.75~19 mm)作为变量,探究2个变量对抗压强度和透水系数的规律。研究结果表明:一方面,再生砖混透水混凝土的抗压强度在水灰比变化时,起初会有所增强,但之后会呈现下降趋势;而随着骨料粒径的增加,其抗压强度则逐渐减弱。另一方面,该混凝土的透水系数会随着骨料粒径的增大而增加。值得注意的是,不同骨料粒径下的水灰比对透水系数的影响并非一致,存在一定的差异,骨料粒径4.75~9.5 mm和9.5~16 mm下的透水系数随水灰比增大而呈先增大后减小的趋势,而骨料粒径16~19 mm下透水系数随水灰比的增大而减小。文章研究结果可为实际工程提供参考和借鉴。

The reuse of construction brick waste is conducive to saving resources and protecting the environ-ment,and promotes the faster realization of the"double-carbon"goal in China.In this paper,the water-cement ra-tio(0.28~0.32)and aggregate size(4.75~19mm)were used as variables to investigate the effects of these two vari-ables on the compressive strength and permeability coefficient of recycled brick-mixed pervious concrete.The re-sults show that,on the one hand,the compressive strength of recycled brick mixed pervious concrete increases at first,but the decreases when the water-cement ratio changes.With the increase of aggregate size,the compressive strength of aggregate decreases gradually.On the other hand,the permeability coefficient of recycled brick mixed pervious concrete increases with the increase of aggregate size.It is worth noting that there are some differences in the effect of water-cement ratio on the permeability coefficient under different aggregate sizes.The water permeability coeffi-cients of aggregate size 4.75~9.5mm and 9.5~16mm showed a tendency to increase and then decrease,while the wa-ter permeability coefficients of aggregate size 16~19mm decreased with the increase of water-cement ratio.The re-sults of this study provide references for actual projects.