Thang Le was Laboratory Manager of Research Civil Engineering Laboratory, a central Vietnam laboratory specialising in research on civil and industrial construction for developing a sustainable infrastructure of this region. He has a Bachelor degree from University of Technology, Danang, Vietnam and Master of Science in Civil Engineering from Dong-A University, Busan, South Korea. Now he is following a PhD course at University of Technology, Sydney. He has extensive experience in soil testing in the field and laboratory, and his current professional interest is in expansive soil management in geotechnical respective and civil applications.
Le, TM, Dang, LC & Khabbaz, H 2019, 'Combined Effects of Bottom Ash and Lime on Behaviour of Expansive Soil', Recent Advancements on Expansive Soils, Springer International Publishing, pp. 28-44.View/Download from: UTS OPUS
This study illustrates the effectiveness of combining bottom ash and hydrated lime to enhance the engineering properties of expansive soil. The bottom ash was collected from Eraring Power Station in New South Wales, Australia, as a by-product of coal-fired power stations, and soil specimens were used as artificial soil including kaolinite, bentonite and fine sand in a reasonable ratio to stimulate soil samples with characteristics of expansive soil. The stabilised soil samples were prepared by altering the bottom ash content from 0% to 30% on a dry weight basis of expansive soil as well as with constant percentage of 5% in hydrated lime. Through conducting a series of experimental tests including linear shrinkage and unconfined compressive strength (UCS) in various curing time, the shrinkage and strength behaviour of treated soils were investigated and compared with untreated soil samples. The results revealed that the combination of bottom ash and hydrated lime significantly reduced the linear shrinkage, while it increased the strength of expansive soil. The use of bottom ash alone is not recommended due to a slight increase of linear shrinkage and a minor negative impact on the soil strength. The optimum content of combined bottom ash and hydrated lime to stabilise expansive soils is also presented.