Macropore Cement Stabilized Gravel Mixture And Application

Through the investigation of draining status and drainage system setting of some freeway in the region of Hunan and Hubei province, it has be found that the structure of freeway can not be avoided to come forth many kinds of diseases as long as it is used for some time. Among those diseases water damage for the structure of freeway can not be passed away, and water is one of important causations that quicken the structure of freeway to be damaged.The existing highway design criterion only takes setting pavement longitudinal grade, side ditch and drainage ditch into account in order to eliminate surface water. Notwithstanding highway design criterion sets forth the importance of drainage, it does not bring forward the measurable index of drainage quality for pavement structure design. Through setting interior drainage system, water saved in the pavement structure can be eliminated from subgrade and pavement structure, and it does good to improve the pavement performance and prolong the service life of pavement.Through much analysis of laboratory experiments, this paper reach the conclusion that aggregate gradation, degree of compaction, water cement ratio and magnitude of cement are the main factors that influence the coefficient of permeability and the compressive resilience modulus of high air void cement-stabilized crushed stone mixture. By controlling the range of the dry density, magnitude of cement and water cement ratio of mixture, the requirement of drainage property and structure strength can be fulfilled. The paper has put forward and testified four utilizable aggregate gradation. Because the method of preparing samples has certain effect on material property parameter of mixture, the paper recommend static preparing method be adopted.Through structural analysis of traditional semi-rigid base course asphalt pavement which appears water damage, the paper reach the conclusion that water has an effect on material design parameter and pumping leading to the change of contact condition are the main factors. The effective adhesion of permeable base and asphalt pavement, good residence of scouring property of mixture and good drainable property are benefit for undersurface of pavement and permeable base course to keep good successive contact condition. By structural analysis and calculation for original highway structure without permeable layer, the critical modulus of base have been obtained which makes asphalt pavement fill different allowable stress criterion. By structural analysis and calculation for different highway structure with permeable layer, critical modulus of permeable base course are obtained to make asphalt pavement fill different allowable stress criterion. The paper also presents the tendency of structure response of different highway structure with drainable layers mainly depends on the thickness of asphalt pavement, the thickness and the critical modulus of permeable base.The flow process diagram for new construction highway considering the factor of water effect is presented in the paper. In allusion to test roadway in the Zhang-luo second class highway and Lin-Chang freeway, through hydrologic analysis, hydraulic calculation and with the analysis of highway structure, the blue print of setting drainagesystem, construction technique and back-check experiment are presented.