The Effect of Fly Ash and Bottom Ash Pile in Problematic Soil Due to Liquefaction

Abstract

Generally, a construction structure is located on a by soil preferably a good and sound soil properties. However due to limited location of a good and sound soil properties, engineers were challenge by constructing a structure on a problematic soil condition. Mostly, the engineer will be facing building a structure on a loose sandy soil and worst it has a higher chance of liquefaction. This sandy soil can cause the problem to the structure of the building especially if the bearing capacity of the soil is not adequate. For example, the settlement, cracking will happen due to the earthquakes phenomena and worst-case scenario the building will have to undergo a liquefaction attack aftershock. Thus, to overcome this serious problem, the soil properties must be improved by a suitable method such as soil stabilization. The objective of this research is to assess the effectiveness of using fly ash and bottom ash on soil stabilization in liquefaction condition. In this research, piling was used to increase the density of the soil. This will help to reduce the number of settlement during liquefaction process. The amount of cement (5% of soil weight) and fly ash with bottom ash is used with different percentages (10, 20, 30, 40%). The sand will be mixed with the bottom ash and fly ash in different percentages. After conducting a series of tests, it is concluded that 30% of bottom and fly ash give a better result in reducing the settlement value than other mixture.