Environmental acceptability Table nbsp Heavy metal concentrations in

6. Environmental acceptability
Table 16.
Heavy metal concentrations in TCLP leachates of cement formulation concomitant with fly ash and rice husk ash.Cement KU60019 (%)Concentration (mg/L) at 7 daysCement substitution (%)Concentration (mg/L) at 28 daysPbCrFeZnFly ash (Wang and Vipulanandan, 1996)Rice husk ash (Asavapisit and Ruengrit, 2005)0FA + 0.5%Pb0.550R + 20 PS0.51.33.60FA + 2.0%Pb2.520R + 20 PS0.52.23.20FA + 10.0%Pb3030R + 20 PS0.52.62.550FA + 0.5%Pb0.450R + 30 PS0.53.73.750FA + 2.0%Pb2.020R + 30 PS0.54.12.850FA + 10.0%Pb2530R + 30 PS0.54.42.2Remark: FA = fly ash, Pb = lead nitrate, R = rice husk ash, Cr = chromium hydroxide, Fe = ferric hydroxide, and Zn =  exothermic inc hydroxide, and PS = plating sludge.Full-size tableTable optionsView in workspaceDownload as CSV