Modified Pervious Concrete In Non Self Weight Collapsible Loess Area Study On Road Research

In the non weight collapsible loess area,urban flood and waterlogging disasters occur and some of them are relatively deficient in water resources.The pervious concrete pavement can effectively alleviate the above two problems.Therefore,the non self weight collapsible loess area also needs urgent demand for pavement and pervious concrete.However,the climate factors of the non weight collapsible loess area and the collapsible characteristics of the subgrade Subgrade of the non gravity collapsible loess restrict the pavement of the pervious concrete road.Therefore,it is an urgent problem that how to modify the surface layer of the pervious concrete road and adopt reasonable drainage measures.According to the climatic and geological characteristics of the non self weight collapsible loess area,the collaborative working conditions of the pervious concrete surface structure and the non self weight collapsible loess roadbed are analyzed.The pervious concrete was modified by basalt fiber and slag powder.The physical and mechanical properties,such as compressive strength,flexural strength and permeability,were studied,and the percolation performance of pervious concrete was analyzed.The main contents are as follows:(1)The related physical and mechanical properties of water pervious concrete and non gravity collapsible loess subgrade are obtained through investigation and analysis.(2)The critical porosity of pervious concrete with aggregate size of 3-5mm and 5-10 mm are tested to meet the compressive strength of C20,and on the basis of critical porosity,the modified experiment is carried out by using slag powder and basalt fiber to the pervious concrete.The experimental results show that the best content of slag powder is 7.5% while the best fiber ratio of basalt fiber is 0.2%.(3)The permeability coefficient is converted into viscous drag coefficient according to Darcy's law,and the effectiveness of the porous medium model to analyze the drainage capacity of the permeable concrete pavement is verified by the connector model.(4)According to the optimal basalt fiberuration drainage research of the single layer and double layer,the performance for more rain,rainfall intensity and rainfall intensity and less rainfall in smaller areas relatively excellent surface layer structure is obtained.The conception of rationality of the surface layer structure also is analyzed.