THE EFFECTS OF DELAYED COMPACTION UPON LIME-STABILISED SOIL

RESEARCH CONDUCTED TO EVALUATE THE EFFECTS RESULTING FROM ADDING VARIOUS CONTENTS OF DIFFERENT TYPES OF LIME TO A CLAY LOAM SOIL IS REPORTED. THE LIMES STUDIED, ALL HYDRATED, WERE A HIGH-CALCIUM LIME, A DOLOMITIC LIME, AND A CALCITIC SEMI- HYDRAULIC LIME. FOR COMPARISON PURPOSES A PORTLAND CEMENT WAS UTILIZED. FACTORS EVALUATED WERE PLASTICITY, DENSITY AND STRENGTH. STRENGTH SPECIMENS WERE TESTED IN UNCONFINED COMPRESSION AFTER 7 AND 28 DAYS MOIST CURING. IT WAS FOUND THAT ELAPSED TIME BETWEEN MIXING AND COMPACTING CAUSED CONSIDERABLE DECREASES IN BOTH THE DENSITIES AND STRENGTHS OF CEMENT-SOIL MIXTURES WHEREAS THE STRENGTHS AND DENSITIES OF LIME-SOIL MIXTURES WERE RELATIVELY UNAFFECTED. MOST PROMISING RESULTS WERE OBTAINED WITH THE SEMI-HYDRAULIC LIME . LIME ADDITION TO THE CLAY LOAM SOIL RESULTED IN SIGNIFICANT IMPROVEMENTS IN WORKABILITY, AS REFLECTED BY PLASTICITY MEASUREMENTS, WHEREAS THE ADDITION OF CEMENT HAD THE CONTRARY EFFECT. WITH CERTAIN SOILS, LIME IS A MORE EFFECTIVE STABILIZER THAN CEMENT.