Combined effect of sodium sulphate and superplasticizer on the hydration of fly ash blended Portland® cement

Abstract

Combined effect of polycarboxylate type superplasticizer and sodium sulphate on the hydration of fly ash blended Portland ® cement has been studied by using different techniques. Water consistency, setting times, non-evaporable water contents, water percolation, air contents, compressive strengths and expansion in corrosive atmosphere were determined. Hydration products were examined with the help of DTA and X-ray diffraction techniques. It is found that the superplasticizer reduces the pore size and its adsorption on cement surfaces is decreased in the presence of sodium sulphate. Mechanism of hydration is discussed.

Investigation of Waste Paper Cellulosic Fibers Utilization into Cement Based Building Materials

“…However, pore size is one of the most important factors controlling compressive strength. Superplasticizer reduces the pore size or the number of pores and, as a result, the compressive strength is increased [49].…”

Characterization of novel shape‐stabilized phase change material mortar: Portland cement containing Na 2 SO 4 ·10H 2 O and fly ash for energy‐efficient building

“…The formation of gypsum enhanced the early hydration reaction of cement, while the consumption of SO 4 2− reduced the heat storage capacity of PCMs . Kumar et al studied the effect of sulphate on the hydration reaction of the ordinary Portland cement and concluded that sodium sulfate had significant influence on the initial setting time and compressive strength. In addition, fly ash (FA) is a common industrial solid waste, great quantity of stockpiling not only occupied ground but also polluted environment.…”