多孔混凝土配合比设计方法初探

多孔混凝土是一种具有较大孔隙率和较高强度的生态型混凝土,但由于缺乏合适、统一的配合比设计方法,在一定程度阻碍其应用。根据多孔混凝土的结构特征和功能要求,确定了以孔隙率为主设计参数、通过改变胶结材料和骨料粒径来满足强度的配合比的设计思路。设计方法为首先根据设计要求确定选用的材料,再确定单位体积混凝土中骨料的用量,然后根据骨料的表观密度和设计要求的孔隙率确定胶结材料用量,最后根据成型工艺的要求确定水灰比,从而确定单位体积水泥用量和拌合水用量。试配结果表明该多孔混凝土配合比设计方法具有可靠性和可行性。

Preliminary Discussion on Mixing Design of Porous Concrete

Porous concrete is an eco-concrete with high porosity and high strength,whose application was restricted to some extent,because there is lack of appropriate and unitive mixing design method.According to the features of porous concrete,proportion design idea of porous concrete whose major design parameter was porosity and strength was satisfied by changing variety of cementing material and aggregate size.The design method of porous concrete was that the raw materials were selected according to design requirement at first,secondly,aggregate dosage per unit volume of porous concrete was calculated,thirdly,dosage of cementing material was calculated by apparent density of aggregate and porosity of design requirement,finally,cement dosage of the unit physical volume and water dosage were calculated by water cement ratio deter mined by requirement of forming process.The test result indicated that this mixing design method of porous concrete was reliable and feasible.