2021 Volume 75 Issue 1 Pages 380-387
Countermeasures against sludge water containing cement have become an urgent issue at ready-mixed concrete manufacturing plants. In this study, we conducted a demonstration test at three ready-mixed concrete manufacturing plants with different environmental temperatures regarding the high utilization of sludge water, which uses a solid in sludge water whose hydration reaction is suppressed by a condensation-delaying component as a binder. As a result, the concrete produced by substituting 6％ of the unit cement amount with the solid in the flange water in which the hydration reaction was suppressed showed the same physical characteristics as the concrete with the standard composition and the influence of environmental temperatures was not observed. Furthermore, as a result of estimating the amount of CO2 reduction, it was shown that the power consumption of the equipment for manufacturing ready-mixed concrete and the amount of CO2 generated from the fuel consumed by the truck agitator may be offset by the high utilization of sludge water.
