66 / 2023-12-29 11:55:55

Shrinkage and Durability of Green Low Carbon Concrete Prepared by Collaborative Production of Multiple Industrial Solid Wastes

Industrial solid waste; Green low carbon concrete; Autogenous shrin-kage; Drying shrinkage; Durability

Abstract: In order to realize the resource utilization of industrial solid wastes, the shrinkage and durability of green low carbon concrete incorporating various solid waste materials, including limestone powder, fly ash, and slag were investigated in this study. Concrete mixes with different water to binder (w/b) ratios and containing various solid waste materials as partial replacement of Portland cement by ratios of 50% were prepared. Using a combination of experimental and theoretical analyses, the shrinkage properties, resistance to chloride diffusion, freeze-thaw resistance, and carbonation resistance of this concrete were assessed. The results show that compared with ordinary concrete, the incorporation of industrial solid waste has a good inhibitory effect on the shrinkage (autogenous shrinkage, drying shrinkage) of concrete, and improves the shrinkage resistance of concrete. The chloride ion diffusion resistance and freeze-thaw resistance of concrete are improved. However, the substitution of industrial solid waste for cement results in a decrease in the internal alkalinity of concrete, a decrease in the ability to absorb CO₂, and a decrease in the carbonation resistance of concrete.