There is a fundamental inverse relationship between the water permeability coefficient and the mechanical function, that is, the increase in the compressive strength and flexural strength of the brick may cause a decrease in the water permeability coefficient unless special measures are adopted. The physical and mechanical functions of permeable concrete and permeable & # 8203; brick, where permeable concrete belongs to the front permeable single structure, and permeable brick belongs to the front permeable composite structure.
Note: ① Japanese materials;
② Our research results;
③ The data in Japanese materials are measured by the constant water level method, and our experimental results are measured by the variable water level method.
Under normal circumstances, the compressive strength above 20.0MaP can satisfy the paving requirements of the sidewalk, and the compressive strength is 30. MPa can satisfy the laying requirements of lightweight lanes. Therefore, permeable bricks can be widely used to produce and design according to different requirements.
There are many factors that affect the function of permeable bricks, including: particle gradation of aggregates, cooperation ratio, raw material functions, molding conditions, curing conditions, and so on.
The characteristics of permeable bricks are high permeability, but as a pavement product, it is necessary to satisfy the basic condition and strength. Therefore, water permeability coefficient and mechanical function are the two primary quality indicators.