Research On Performance Of Sponge City Permeable Cement Stabilized Macadam Base And Pavement Permeable Design

Urban waterlogging is serious urban problems in the urban development,Sponge cities permeable pavement can effectively solve this problem.Research about permeable design for permeable pavement were seldom studied interiorly,and there were few specifications too.Permeable cement stabilized macadam is the base material of permeable pavement,which has a wide application prospect in permeable pavement.At present,although some literatures have carried out some research on the performance of permeable cement stabilized macadam,there are still few literatures studied on the effects of basalt fiber on the mechanical properties and water permeability of it.In addition,the design method of it remains to be studied.Seven groups of different permeable cement stabilized macadam grading were designed by volumetric method.And the paper studied the influence of the maximum nominal particle size and the passage rate of 4.75 mm on the mechanical properties and water permeability of the material,in order to find the reasonable maximum engineering particle size and pass rate of 4.75 mm mesh.Different groups of material test,which used different cement content,basalt fiber length and dosage were carried out,studying the influence of cement dosage,basalt fiber length and dosage on compressive strength,splitting strength,void ratio and permeability coefficient of materials.And the result would provide the reasonable reference to that for permeable cement stabilized macadam.The paper proposed to apply fractal theory in its gradation design to extending design ways.And the feasibility of using fractal dimension to control its design strength and design void ratio were discussed and analyzed.Moreover,the relationship between the fractal dimension of gradation and the variation of void ratio,compressive strength of mixture was analyzed.The suitable range of fractal dimension of permeable cement stabilized macadam and its relationship with void ratio and compressive strength were obtained.1The previous permeable design was summarized and analyzed,and calculated the permeable thickness and permeability coefficient of the permeable cement stabilized macadam base.A reasonable arrangement scheme of combined drainage system for permeable pavement of cement stabilized macadam base was put forward.The paper carried out a series of material performance tests on permeable cement stabilized macadam.On this basis,the permeable design of permeable cement stabilized macadam base permeable pavement was carried out,which has guidance for the application of permeable cement stabilized macadam material and the construction of permeable pavement.significance.