Properties of Mekong Delta clay stabilised by cement and fly ash for whole block mixing method

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The waste products of electricity by thermal power plants have released a large amount of fly ash into the environment which could create pollution. This paper presents the experimental results and parametric study to determine the unconfined compressive strength (UCS) of Mekong clay stabilisation by cement and fly ash (MCCF). In Case 1, Mekong clay (CL) was mixed with cement (C) at a rate of (10-30%) by dry weight; while in Case 2, CL clay was mixed with cement (C) (10-30%) and fly ash (F) (10-30%). Approximately 336 stabilised soil samples were made by wet mixing method with a water/binder ratio from 0.6 to 0.8. Bayesian Model Averaging (BMA) method was used to analyse the influence of parameters on the UCS, and the Principle Component Analysis (PCA) method was applied to analyse the results and determine the linear regression equation. The results show that with the low cement content (10%), the effect of fly ash is remarkable and UCS strength increased up to 30%. However, at the higher cement content (20% and 30%), the effect of fly ash on the UCS is not significant. Both models show high correlation coefficient R²; hence, the proposed regression equations are reliable and could be use to determine the strength of the stabilised soil material. The research findings could help the engineer in using cement and fly ash to treat soft clay in the Mekong Delta area and reduce fly ash waste in the environment.

9th International Congress on Environmental Geotechnics (ICEG2023)

Advances in Testing and Material Characterization