Immobilization of Arsenate (As~(5+)) Ions in Ordinary Portland Cement: Influence on the Setting Time and Compressive Strength of Cement

摘要

In this study, the resuhs of the studies exhibiting the effect of addition of varying concentrations of arsenic (V) on the initial and final setting time and compressive strength of 43 grade ordinary Portland cement have been presented. Efforts have been made to establish a quantitative correlation between the concentrations of As (V) used and the intensity of any change in above properties of the cement. Arsenic is present in ground water in a wide area of West Bengal (India) in lower concentrationsand we have tried these concentrations also for this study. Sodium hydrogen arsenate (Na_2HAs0_4.7H_20) has been taken in the concentration range 0.1-500 ppm and the results of these investigations are reported in this study. The results show that As (V) is bearable up to 500 pm concentration, without any considerable change in any characteristics of the cement.