ABSTRACT:

Soil stabilisation is a very useful technique for road construction. To utilise the full advantage of the technique the quality control must be adequate. In this study three main groups of test methods are tested and discussed. The first group deals with methods for determination of bearing capacity e.g. complete surface compaction control, static plate load test and light drop weight tester. The second group of method deals with workability and homogeneity tests e.g. moisture condition value (MCV), core sampler and pulverisation test. The third group deals with geophysical methods e.g. spectral analysis of surface waves (SASW) and resistivity.

INTRODUCTION

Shallow soil stabilisation has been used in Sweden since the late 50's but during the 80's it was only occasionally applied, due changed regulations. However the method has met a renaissance during the late 90's partly because of the environmental advantages of the method. During the construction of the new connecting road for the Öresund fixed link, soil stabilisation has been used to ensure sufficient bearing capacity and homogeneity. In the first phase 300,000 square metres of clay till have been stabilised with lime. At three different sites full-scale tests have been performed during the construction of the ring road. At all the sites both conventional testing and geophysics have been used for evaluation. The test methods that have been used are static plate load test (SPLT), light drop weight tester (LDWT), roller-mounted compaction meter, moister condition value (MCV), core sampler, pulverisation, spectral analysis of surface waves (SASW) and resistivity measurement.

BACKGROUND

In 1996 the construction of Yttre Ringvägen, a ring road around Malmö Sweden, was started, see Figure 1. The soil in the area consists of clay till and silty till. This type of soil is very sensitive to variation in water content.

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