The design principle and construction technology of stone contained sandfree prepakt concrete subposts are analyzed in the combination of engineering case.

Processing mechanism,methods and processing effects of post-processing technology with small non-sand prepacked stone concrete pile in the applications of widening engineering of expressway are researched and analyzed on the basis of analysis of key problems and common processing method.

An approach to ground of fine aggregate concrete without sand is introduced in respects of raw and processed materials, proportioning ratio, construction technology, and so on.

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.