Laboratory and Field Performance of stabilized soft subgrade

摘要

Usually the service life of pavement on weaker clayey subgrade is affected due to their high plasticity and compressibility behaviour. These soils possess low strength, CBR value and have high affinity to moisture. Hence seasonal changes affect properties of these soils adversely. Stabilization techniques using waste materials are listed in literature for improving properties of these types of soft subgrades. This paper discusses the performance of stabilized soft clayey soil for suitability as subgrade using two types of admixtures Robo sand and fly ash. Dynamic cone penetration test and CBR tests are carried out in lab and field on composite soil with varying admixture content and the results are presented. It is observed that there is a considerable improvement with admixture in both index & engineering properties. A reduction in plasticity and improvement in soaked CBR with admixture is observed. Results indicated a relatively high performance of robo sand admixture over fly ash