Effect of sulfates on cement and fly ash mortar made with treated domestic wastewater

Abstract

Investigative studies were carried out, to evaluate the effects of sulfates on cement and fly ash mortar made with treated domestic wastewater in the laboratory. Treated domestic wastewater (TDWW) from a treatment plant which is in Vishnu Educational Society, Bhimavaram, A.P, India, was used in the present research work. A combination of (70% Portland cement + 30% fly ash) was arrived based on number of trials where the best compressive strength was obtained. This combination was used throughout the research work. 90 days age of reference specimens, cast and cured in Potable water (PW), and 90 days age of test specimens cast and cured in treated domestic wastewater (TDWW) were immersed in sodium sulfate (Na2SO4) and magnesium sulfate (MgSO4) solutions. When compered test specimens with reference specimens, Loss of compression strength in test specimens was almost same as that of reference specimens. But MgSO4 was more vulnerable than the Na2SO4.