In order to reduce the quantity of the unused steel-slag and take full advantage of their useful values in pile foundation

the research is conducted on the confecting method of steel-slag concrete. Through comparison of the physical and mechanical properties between steel-slag concrete and plain concrete

we can analyze the advantages of using steel-slag concrete. Based on the test

an empirical formula is developed

which provides some bases for practical projects. The mechanical properties of steel-slag concrete prevail over that of the plain concrete; also the quantities of cement and gravel are reduced

consequently reducing the capital cost of the project materials; so this method is economically and safely to use and it can solve the environmental problems of unused steel-slag.