Mechanism Of Salt Freezing Damage And Prevention Of Concrete Pavement

With the rapid development of China's economic construction, the traffic in national development is also an increasingly important role. Wide range of sources of raw materials as concrete, easy pouring molding, adaptability, lower construction costs; they have been widely used in various fields. But concrete is not so durable as expected, many works did not meet length of service there have been many cases the damage should not occur. In cold areas, in order to de-icing of roads to ensure traffic safety and transport efficiency, it is extensive use of de-icing salt for deicing roads snow removal, although the short period of time to solve the security problem, but a lot of use of accelerated de-icing salt The destruction rate of pavement concrete, concrete pavement under the action of the deicing salt, freeze-thaw damage, damage faster than normal times or even ten times. This problem not only caused great economic losses, but also in the process of repair and reconstruction, has seriously affected the normal operation of urban transport system.Based on the failure characteristics of concrete pavement, mechanism analysis, the salt freezing of concrete erosion on domestic and international evaluation, summed up a rapid erosion of Concrete salt freezing method. Through extensive experiments, on the concrete strength, elastic modulus, the determination of the amount of peeling, peeling off the final OK to freeze the amount of salt as a measure of erosion damage to concrete evaluation parameters, while the road Scaling Resistance of Concrete air content and design of different age conditions for classification, namely, when the concrete air content is small (A<5%) or the design life of 20 years of concrete pavement, concrete as a measure to 1000g/m2 Scaling Resistance criteria; when the concrete air content in the larger (5 %