The strength prediction of pervious concrete is hard to implement for the mix design due to the porous structure. This work studied the influence of the water-to-cement ratio on the fluidity, viscosity, and mechanical properties of cement paste. Then, the porosity, permeability, and compressive strength of the pervious concrete with various porosities were investigated, and the test results were fitted and analyzed. The result indicates that as the water-to-cement ratio increases, the viscosity of the cement paste reduces and the fluidity increases. The water-to-cement ratio has a negative linear relationship with net slurry strength. The porosity and permeability of pervious concrete fluctuate in accordance with the same rule as the water-to-cement ratio changes. The compressive strength of pervious concrete with varying design porosities increases initially, then declines as the water-to-cement ratio rises. According to the linear fitting analysis, when the water-to-cement ratio is constant, the permeability and compressive strength of pervious concrete have a positive and negative linear relationship with the design porosity, respectively. By analyzing the fitting results and combining the volume method of pervious concrete, a calculation method for mix proportion design is proposed to predict the strength of pervious concrete.

中文翻译：

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基于设计孔隙率和水灰比的透水混凝土强度预测研究

由于透水混凝土的多孔结构，其强度预测很难在配合比设计中实现。【摘要】：研究了水灰比对水泥浆体流动性、粘度和力学性能的影响。然后对不同孔隙率透水混凝土的孔隙率、渗透率和抗压强度进行了研究，并对试验结果进行了拟合和分析。结果表明，随着水灰比的增加，水泥净浆的粘度降低，流动性增加。水灰比与净浆体强度呈负线性关系。透水混凝土的孔隙率和渗透率随着水灰比的变化而波动。不同设计孔隙率的透水混凝土的抗压强度首先增加，然后随着水灰比的增加而下降。根据线性拟合分析，当水灰比一定时，透水混凝土的渗透率和抗压强度分别与设计孔隙率呈正、负线性关系。通过分析拟合结果，结合透水混凝土的体积法，提出了一种配合比设计的计算方法来预测透水混凝土的强度。