EFFECTS OF QUARRY DUST ON THE ENGINEERING PROPERTIES OF LATERITIC SOILS

ABSTRACT

This research work involves the improvement of the engineering properties of lateritic soil by stabilization with quarry dust on fines. The laterite used for this research work was collected from Ibokun road Oke Baale in Osogbo. The sample was subjected to laboratory tests at the Civil Engineering Department Laboratory Futa, Akure and Osun State Ministry of Works and Transport, Osogbo. The tests were carried out on both the natural soil sample and the modified soil sample and they included: the moisture content, specific gravity, grain size distribution, Atterberg’s limits, compaction and California Bearing Ration (CBR). These tests were performed on the soil both before adding quarry dust and after adding varying percentages and proportions of quarry dust. The results indicated that the quarry dust could be used to alter and make up for the deficiencies in the particles sizes of the laterite thereby increasing the potential for its use as base material. The results of the moisture content that showed a decrease in the optimum moisture content for the laterite-cement mixture as the quarry dust content increased. This was because the laterite contained clayey particles, which required water for the bonding action is thereby reducing hardening. The consistency limits decreased in the consisting properties, quarry dust alter, the graduation of the laterite while cement is used to bind the mixture together, which in turn reduces the liquid limit, plastic limit, linear shrinkage of the resulting mixture. The (CBR) valued showed the clay fraction in the mixture is decreased due to increase in quarry which earlier on was done by the clay fraction at lower percentage of quarry dust on the laterite quarry dust mixtures. The granite in the quarry dust adds strength and rigidity to the mixtures the quantity of the quarry dust increases.