云南玉溪海绵城市白水泥透水混凝土配比优化研究

Research on Mix Proportions of the White Cement Pervious Concrete in the Yuxi Sponge City of Yunnan Province

针对云南玉溪海绵城市建设过程中白水泥透水混凝土存在的问题,本研究选择白水泥作为胶凝材料,研究考察水胶比、减水剂掺量、设计孔隙率三个不同因素对白水泥透水混凝土抗压强度和透水性的影响,深入分析三个因素的作用机理,以优化配合比参数,改善白水泥透水混凝土综合性能,并提出施工改进措施。研究结果显示,白水泥透水混凝土抗压强度与透水性之间存在对立关系,且当水胶比为0. 32,减水剂掺量为1. 5%,设计孔隙率为15%时,试块的综合性能最佳。

For the problems of white cement pervious concrete in the construction of sponge city in Yuxi,Yunnan Province,white cement was selected as cementing material in this research.The effect of water-binder ratio,water reducer dosage and design porosity on the compressive strength and water permeability of white cement pervious concrete was studied and the mechanism of its action was deeply analyzed,to optimize mix proportion,improve comprehensive performance of white cement pervious concrete and propose construction improvement measures.The research results show that there is an opposite relation between the compressive strength and water permeability of white cement pervious concrete.Moreover,when water-binder ratio is 0.32,dosage of water reducer is 1.5%and design porosity is 15%,the comprehensive performance of the test block is the best.