With the project of the Xilin River Bridge as a practical example, the mix proportion of the non-sand-and-big-hole concrete is designed, with its density, intensity and dank capability related to its road use performance experimentally studied, and the effective construction approaches put forward, and the integrative benefit of the non-sand-and-big-hole concrete in road bed backfill analyzed.

In older to resolve the problem of the great amount of cement and the high cost of non-sand cement grounting pile at parent, after testing studies, it is demonstrated that if fly ash is mixed into non-sand concrete by 15%￣ 20% amount of cement, and water cement ratio equal or less than 0.

Mix design of the no-fines concrete grouting pile;

This article adopts orthogonal experiment method to carry out research on resistance press and percolation of no-fines concrete, and mensurates porosity and effective porosity of no-finesconcrete and discusses the formula of calculating percolation co-efficient and analyses the factors that have effect on intensity and percolation of no-fines concrete, the mix proportion for practice is raised.

On construction technology of lean concrete porous base course;

The application of small concrete pile without sand in expressway composite foundation;

The background disposal for roadbed and fillings of narrow special and certain section,using the complex groundsill technique of small concrete pile without sand,can reduce roadbed settlement,control the settlement difference and release jump car of the background.