Frost resistance of flexible pavements

Abstract

The article shows that the algorithm used in the road design standard and national prestandard for calculating the frost resistance of flexible pavements has errors. The analysis is carried in terms of the probability theory. Using the moments method, the problem of frost resistance of flexible pavements is solved. The general calculation allows evaluating particular options. It is proven that the algorithm proposed by the road design standard gives a result with a 0.5 probability, which cannot be acceptable. The proposed algorithm is presented in the form of equation of the frost resistance. From this equation, with an allowable value of heaving and 0.95 probability, the soil heaving is determined, which is always less than the allowable value. The known soil heaving allows to determine the thickness of the anti-frost heavy course, which is much greater than the thickness determined by algorithms proposed by the road design standard and national prestandard. Technically, the material is overspent, but the comparison is made with the error-containing algorithm. Therefore, this comparison cannot be correct. It is recommended to replace algorithms proposed by the road design standard and national prestandard with the algorithm proposed in this article.