Evaluation indices of freezing-thawing destruction for airfield runway concrete

In order to research the evaluation indices of freezing-thawing destruction for airfield runway concrete in north cold area of China, three concrete examples with anti-freezing capability were made, and their freezing-thawing devastating experiment was done by rapid freezing experimental machine. Their dynamic moduli of elasticity were measured by DT-10W, and the changing rules of relative dynamic moduli of elasticity, flexural strength losses, concrete mass losses and surface scale-offs under different freezing-thawing cycles were analyzed. The critical value of freezing-thawing destruction was presented for airfield runway concrete. Experimental result indicates that as freezing-thawing cycles accumulate, the compressive and flexural strengthes decline at different rates for the samples, of which the flexural strengthes lose more faster. The surface scaling areas and depthes of concretes become serious and mass losses have severe influence on the surface smoothnesses of the samples. According to the rules, the evaluation indices are put forward after 300 freezing-thawing cycles, which is that relative dynamic modulus of elasticity is less than 75% (flexural strength loss ratio is not more than 46%) and mass loss ratio is less than 1.0% (moderate surface scale-off).