EFFECT OF CHLORIDE AND SULPHATE ON COMPRESSIVE STRENGTH OF BANGKOK CLAY ADMIXED CEMENT
Keywords:Sodium chloride, Sodium sulphate, Bangkok clay, Diffusion double layer
The paper presents the results of an experimental investigation on the influence of salt content on
the unconfined compressive strength of Bangkok clay admixed with cement. The soil sample was added with
sodium chloride (NaCl) and sodium sulphate (NaSO4) at varying salt content of 3%, 5%, 10% and 15% by weight
of soil. Based on the results of the study, it was found out that as the salinity increases, the diffusion double layer
decreases. Hence, resulting to a decrease on the liquid limit (LL), plastic limit (PL), and plasticity index (PI).
Moreover, at a certain moisture content, cement content, and curing time, the unconfined compressive strength of
saline (sodium chloride and sodium sulphate) Bangkok clay admixed cement decreases with the increase of salt
content. It was observed that the compressive strength of Bangkok clay admixed cement mixed with sodium
sulphate (NaSO4) exhibited higher compressive strength than the one mixed with sodium chloride (NaCl) for all
curing times and mixing ratios. Moreover, it was noted that it has compressive strength than the natural clay
admixed with cement.