The frost sensitivity of soil influences among other factors, the thickness of the frost proof superstructure of road surfaces. According to RStO: if a frost resistance has been proved in the qualification tests, the thickness of the frost-superstructure can be reduced to a maximum of 20 cm by soil stabilization with quicklime and hydrated lime. With soil improvements with lime and under certain conditions, a reduction of the frost sensitivity can be also reached. If a very frost sensitive soil (of the frost sensitivity class F3) is converted by the lime treatment in the frost sensitivity class F2, then the thickness of the frost proof superstructure is reduced up to 10 cm. A method and its related standards is developed to quantify the reactivity of the soil with the lime and the associated reduction of the frost sensitivity. In the course of the project, various samples are produced. Their strength, bearing capability, and frost sensitivity are determined by different methods.

Almut Lottmann
life:
01.09.2003 - 31.08.2005