Abstract: A new method for preparing reactive powder concrete (RPC) was proposed based on the orthogonal theory and current preparing experience experiments. The method contains two steps, first the best matrix of PRC material should be selected by the orthogonal design theory, then the dosage of steel fiber is optimized through experiments. On basis of the method, RPC material was prepared with cement P.O 42.5R, fly ash, silica fume, river sand, super-plasticizer and steel fiber, and its flexural strength can reach 38.6 MPa.

Key words: reactive powder concrete;mix proportion;orthogonal design;strength;toughness