透水混凝土配合比优化设计试验研究

Experimental Study on Optimal Design of Permeable Concrete Mix Ratio

以开发一种具有较高强度的新型透水混凝土为目标,试验尝试了各种配合比设计,并研究了各种配合比设计对透水混凝土抗压强度和透水性能的影响,提出了透水混凝土的最佳骨料和配合比优化设计方案。研究表明:在透水混凝土中,高效减水剂在辅助硅灰分散方面效果显著;采用机制砂可提高透水混凝土的抗压强度;添加细骨料和外加剂后,最佳水灰比为0.32,28 d抗压强度有所提高,透水率大于2 mm/s;当透水混凝土路面对结构强度要求不高或在较长使用时间内特别担心路面堵塞隐患时,可采用较高的水灰比0.36。

This experiment aimed to develop a new type of permeable concrete with high strength,with various mix ratio designs tried.In addition,the effects of various mix ratio designs on the compressive strength and permeability performance of permeable concrete were studied,and the optimization design scheme of the optimal aggregate and mix ratio of permeable concrete was proposed.The study shows that in permeable concrete,the high-efficiency water-reducing agent is effective in assisting silica fume dispersion;the use of mechanism sand can improve the compressive strength of permeable concrete;after adding fine aggregate and admixture,the optimal water-cement ratio is 0.32;the compressive strength after 28 d is improved,and the permeability is greater than 2 mm/s;when the structural strength requirement of permeable concrete pavement is not high,or when there is special concern about pavement clogging in a longer period of use,a higher water-cement ratio of 0.36 can be used.