市政道路透水混凝土的配合比设计研究

摘要:

对于透水混凝土的配合比设计,传统方法的设计参数主要基于目标孔隙率和集料紧密堆积密度,存在强度设计缺乏依据、实际孔隙率偏离目标值较大、混凝土透水功能无法保证等缺陷。为此,引入参数浆体厚度与集料比表面积,提出一种新的配合比设计方法。该方法基于浆体均匀包裹模型与集料特性,浆体体积可借助集料的比表面积确定,继而得到配合比。研究表明：采用新方法设计的透水混凝土在不同的强度和集料特性要求下适应性较好,在透水性良好的同时满足力学性能的设计要求,

Abstract:

For the mix proportion design of permeable concrete, the design parameters of traditional methods are mainly based on the target porosity and aggregate compact packing density. There are some defects, such as lack of basis for strength design, large deviation of actual porosity from the target value, and inability to guarantee the permeable function of concrete. Therefore, a new mix proportion design method is proposed by introducing the parameters slurry thickness and aggregate specific surface area. This method is based on the slurry uniform wrapping model and aggregate characteristics. The slurry volume can be determined by the specific surface area of aggregate, and then the mix proportion can be obtained. The research shows that the permeable concrete designed by the new method has good adaptability under different strength and aggregate characteristics, and meets the design requirements of mechanical properties while having good water permeability.