摘要
为了探究水灰比、PAN纤维、硅灰和黏结剂等对透水混凝土孔隙率、透水系数与抗压强度等性能的影响,设计四因素三水平的正交试验,以极差、方差法对孔隙率、透水系数、抗压强度进行了分析,得到了各性能指标的影响因素顺序与最佳组合.试验结果表明:水灰比对透水混凝土性能的影响程度最大,且试件组孔隙率、透水系数普遍较大,最大值分别为27.41％、18.89 mm/s,抗压强度最大为22.2 MPa;试件组透水混凝土的最佳组合水灰比0.31、PAN纤维掺量0.6％、硅灰掺量8％、黏结剂掺量2％～3％.抗压强度和透水系数均可通过3种模型函数(Balshin、Ryshkewitch、Hasselman)与孔隙率建立关系,且拟合效果较好,随着孔隙率增大,抗压强度呈下降趋势,透水系数呈上升趋势.
Abstract
In order to explore the effects of water-ash ratio,PAN fiber,silicone ash and binder on the properties of permeable concrete,permeability coefficient and compressive strength,the four-factor three-level orthogonal test was designed,and the porosity,permeability coefficient and compressive strength were analyzed by the method of extreme difference and variance,and the order and optimal combina-tion of influencing factors of each performance index were obtained.The test results show that the water-ash ratio has the greatest influence on the performance of permeable concrete,and the porosity and permeability coefficient of the specimen group are generally large,the maximum values are 27.41％,18.89 mm/s,and the maximum compressive strength is 22.2 MPa.The best combination of permeable con-crete in the specimen group is:water-ash ratio 0.31,PAN fiber dosage 0.6％,silica ash dosage 8％,binder dosage 2％～3％.Compressive strength and permeability coefficient can be established by Balshin,Ryshkewitch,Hasselman three model functions and porosity,and the fitting effect is better,with the increase of porosity,the compressive strength shows a downward trend,and the permeability coefficient shows an upward trend.
维普
万方数据