Urgent problems of using needle fiber for fine-grained concrete disperse reinforcement are considered in the article. The fine cement and binder agent with low water requirements were used as an astringent. The main filling material of a fiber concrete mix was granite siftings. It is established that application of the composite binder agent and high-density packaging of filling grains increases strength properties a lot. Optimal selection of filling material allowed to receive steel fiber concrete with ultimate compressive strength 118,8 MPa, and ultimate bending strength 14,1 MPa for heavily loaded floors of industrial buildings. It is established, that application of composite binder agent and high-density packaging of filling grains of concrete matrix can be effective in social, ecological and economic spheres. Incidentally, the economic effect of using new building materials will consist in consumption decrease of astringent for account of optimal conditions of steel fiber concrete structure formation.