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针对多孔混凝土材料在级配设计中与普通混凝土存在较大差异的问题,根据最大密度曲线理论,以减少细集料含量的方法设计了3种集料级配。通过设计正交试验,采用极差分析方法分析了集料级配、灰集比、水灰比对多孔混凝土材料力学强度和空隙率的影响。结果表明:级配方式、灰集比对多孔混凝土材料力学强度和空隙率影响较大。同时,正交试验的方差分析表明灰集比是影响力学强度的显著性因素,而级配方式和灰集比是影响空隙率的显著性因素。此外,通过回归分析发现多孔混凝土空隙率与强度之间具有良好的线性相关关系,二者此消彼长。
Aiming at the problem that porous concrete has big difference from ordinary concrete in grading design, according to the theory of maximum density curve, three kinds of aggregate gradation are designed to reduce the content of fine aggregate. Through the design of orthogonal experiment, the effect of aggregate gradation, ash-collecting ratio and water-cement ratio on the mechanical strength and porosity of porous concrete were analyzed by using range analysis method. The results show that the gradation method and ash set ratio have great influence on the mechanical strength and porosity of porous concrete. At the same time, the analysis of variance of orthogonal experiment shows that the ash concentration ratio is a significant factor affecting the mechanical strength, while the gradation method and ash ratio are the significant factors affecting the porosity. In addition, regression analysis showed that porosity and strength of porous concrete had a good linear correlation between the two shift.