Shear Strength of Soft Soil Reinforced with Singular Bottom Ash Column

Abstract

Structures construct on soft clays are often affected by stability and settlement problems due to high compressibility, low shear strength and low permeability of soft clay which will lead to bearing capacity failure and excessive settlement. The soft clay samples had the dimensions of 50 mm diameter and 100 mm in height. The bottom ash column had two (2) different area replacement ratios which were 4% and 9% (10 mm and 15 mm diameters respectively) with the bottom ash column penetration ratio of 0.3, 0.7 and 1.0. The results of the unconfined compression test show that there is an improvement in shear strength of soft kaolin clay when reinforced with bottom ash column. For samples with area replacement ratio 4%, the results show the increment of 25%, 37.5% and 50% at height penetrating ratio of 0.3, 0.7 and 1.0, respectively in shear strength. Meanwhile, for samples of 9% area replacement ratio, the shear strength of the soft kaolin clay increased about 14.29, 28.57 and 57.14%, respectively. It can be concluded that by reinforcing the soft clay using singular bottom ash column, the shear strength of the soils increases and become more significant as the area replacement ratios and the column penetration ratios increase.

Experimental investigations on physico-mechanical properties of kaolinite clay soil stabilized at optimum silica fume content using clamshell ash and lime

“…Therefore, it can be concluded that utilizing CSA in SFSS can reduce the total cost of soil stabilization up to 10.06% (with 3% CSA utilization), 22.51% (with 6% CSA utilization), and 31.99% (with 9% of CSA utilization), while utilizing lime in SFSS can increase the total cost of stabilization up to 5.37% (with 3% lime utilization), 4.20% (with 6% lime utilization), and 3.30% (with 9% of lime utilization) compared to the utilization of cement as soil stabilizing agent. Nevertheless, due to the cost-effectiveness of CSA utilization in SFSS, this material is an ideal choice for stabilizing problematic and expansive soil [70][71][72] .…”