L9(34) Orthogonal test was used to optimize the reaction temperature,reagent formula,and reaction time with the degree of sulfate group and carbohydrate content as index.

In the paper,the experiments were designed to optimize agents according to the orthoplan design,and the physical and chemical conditions were discussed.

The Application of Proportioning Test in the Process for Casting-Boronising of Gray Iron;

This paper aims for the construction of South Xizang Road Tunnel in Shanghai with shield tunneling method, a series of grouting material proportioning tests were carried out.

The mix proportion test carried out before construction and quality inspection conducted after construction are introduced,which can assure the engineering quality of piles made cement-soil material.