Friction parameter surface treated concrete with a remedy against dryness

Engineering and construction of roads, subways, airfields, bridges and transport tunnels

The article devoted to developing techniques for measuring the parameters of road friction and airfield pavements in order to study the influence of external factors on the slip resistance of concrete surfaces treated with care products, particularly based aqueous dispersions of polymers and waxes which are applied to prevent withdrawal of the air. In this paper we propose a scheme and technique of testing concrete friction. Test results obtained concrete surface before and after application of the protective film. A fundamental difference in the nature of friction for these surfaces. The protective film obtained by coating the surface of the cement coating means Emcor BFM reduces resistance to more than three times. Friction vs. normal load for cement surface is linear and obeys Coulomb. The coefficient of friction is constant and is 0.34. Friction vs. normal load for a surface covered with a protective film is nonlinear and therefore not subject to the law of Coulomb. The friction coefficient in this case decreases with an increase of the normal load. Values for this ratio obtained in the tests ranged from 0.092 to 0.029, that at times is less than 3,7-11,7 coefficient of friction on the surface of untreated cement.