In the context of a research assignment of the Federal Ministry of Transport, the performance of traffic routes, with calcareous improved or stabilized base course is examined.  On the basis of field researches during executed road building measures and in the laboratory is examined how the strength and the frost sensitivity of the lime improved layer developed, under the influence of climate and traffic, after several years of exposure.

The bearing capability measurements on the lime-treated base course (CBR-tests and plate load test) showed that the strengths vary widely. Influencing factors of the strength development are e.g. the soil type, calcareous admixture, the water content and the compaction during the installation. From the strength test (laboratory examinations) of the frost-thaw-circle load results that lime treated soils have a higher strength than the untreated original soil.

In compliance with some conditions, lime treatment can reduce the frost sensitivity of a soil which leads to cost savings in the frost thickness measurement of a road.

Almut Lottmann
life: 01.05.2000 - 31.10.2002