The estimation of long-term changes in the properties of steel fiber reinforced concretes with expanding producing agents

This article is about the results of two-year studies of influence of expanding producing agents on the deformations, strength and operational properties of the steel fiber reinforced concrete. It is found that the effect from introducing expanding producing agents is significantly reduced over time and final values of shrinkage of steel fiber reinforced concretes are 0,102–0,451 mm/m, and shrinkage of the control compositions without expanding additives are within 0,732–0,764 mm/m. Also found the compositions of steel fiber reinforced concretes in which the deformations after two years are stayed positive with value 0,036–0,092 mm/m. Measured values of the elastic modulus and Poisson’s ratio of two-year steel fiber concretes which are 29800–38600 MPa and 0,15–0,22 respectively. The maximal elastic modulus values registered in compositions with positive strains at two-years old, that confirms the hypothesis about the formation of prestressed fiber carcass in the matrix of composite material in specific conditions.

M.S. YELSUFYEVA, Еngineer
V.G. SOLOVYEV, Candidate of Sciences (Engineering)
A.F. BURYANOV, Doctor of Sciences (Engineering)
M.R.NURTDINOV, Еngineer
V.A.KAKUASHA, Еngineer

Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

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