细集料掺量对透水混凝土性能的影响

Effect of Fine Aggregate Content on Performance of Pervious Concrete

摘要: 为研究细集料掺量对透水混凝土性能的影响，制备透水混凝土混合料，选用I型普通硅酸盐水泥、级配类型为II的细集料和四种粒径的粗集料(即4.75 mm~9 mm、9 mm~12.5 mm、12.5 mm~16 mm、16 mm~19.5 mm)，采用水灰比为0.34，水泥掺量为400 kg/m³，集灰比为4.75:1。以质量范围为0%~50%的细集料代替粗集料，对混合料的各种力学性能(抗压强度、抗弯强度、劈裂抗拉强度)进行评价，基于试验数据建立棱角指数与集料强度、抗磨耗性、渗透性、间隙率的关系，通过探究透水混凝土的抗压强度与渗透性之间的平衡关系确定了最佳混合料：粗集料粒径分别为16.0~19.5 mm、13.5~16 mm，细集料掺量为30%的混合料，以及粗集料粒径分别为9.0~12.5 mm、4.75~9.0 mm，细集料掺量为20%的混合料。混合料具有更好的路用性能，为透水混凝土作为路面材料的适宜性提供科学依据。

Abstract: In order to study the effect of fine aggregate content on the performance of permeable concrete, the permeable concrete mixture was prepared, and type I ordinary Portland cement, fine aggregate with gradation type II and coarse aggregate with four particle sizes (i.e., 4.75 mm~9 mm, 9 mm~12.5 mm, 12.5 mm~16 mm, 16 mm~19.5 mm) were selected, and the water-cement ratio was 0.34, the cement content was 400 kg/m³, and the ash collection ratio was 4.75:1. The fine aggregate with a mass range of 0%~50% was used instead of coarse aggregate, and various mechanical properties (compressive strength, bending strength, splitting tensile strength) of the mixture were evaluated, and the relationship between the angular index and the aggregate strength, abrasion resistance, permeability and clearance rate was established based on the test data, and the optimal mixture was determined by exploring the balance relationship between the compressive strength and permeability of permeable concrete: the particle size of the coarse aggregate was 16.0~19.5 mm and 13.5~16 mm, and the fine aggregate content was 30%. The mixture, as well as the mixture with a coarse aggregate particle size of 9.0~12.5 mm, 4.75~9.0 mm, and a fine aggregate content of 20%. The mixture has better road performance, which provides a scientific basis for the suitability of permeable concrete as a pavement material.