Study on the effect of sewage on the performance of concrete

Abstract

In this paper, the sewage produced in the production process of concrete mixing plant is used as mixing water, and the effect of sewage pH value, sediment chemical composition, water demand, strength activity index, and different mixing amounts of sewage on various properties of C30 concrete is studied in detail. Studies have shown that the produced sewage has a concentration of 14% and a pH of 12.4, which is a strong alkaline solution with a sediment strength activity index of 55%; under the same unilateral water consumption and moderate sewage mixing conditions, the performance of concrete is better than the benchmark. Continue to increase the content of concrete, the fluidity of the concrete will become worse, the workability will be reduced, and the strength will gradually increase; in the case of the “saturated water consumption”, the volume of sewage will increase, the concrete wrapping and fluidity will become better, and the slump retention will become worse. The setting time becomes shorter.