Research Status of Products Made from All-solid Waste Cementitious Materials with CO₂ Mineralization Curing

Abstract

Carbon dioxide capture, utilization and storage (CCUS) technology is regarded as the most effective method to control anthropogenic carbon emissions and mitigate climate change at present. And the CO₂ obtained by industrial carbon capture technology urgently needs subsequent utilization technologies with large scale and good economic benefits. The CO₂ mineralization curing building material technology can achieve carbon sequestration through the direct gas-solid reaction between the concrete material after early-stage molding and CO₂. It is expected to achieve large-scale greenhouse gas emission reduction and obtain low-carbon building materials products with high added value at the same time. In particular, using CO₂ to mineralize and cure concrete building materials and replacing the existing high-energy-consuming steam curing or natural curing process can shorten the curing time, reduce production energy consumption, and optimize the performance of building materials. At present, the mineralization curing technology is still in the stage of mechanism research and material development. There is a lack of optimized design of mineralization raw materials, and there is also a lack of comprehensive and in-depth research on the micro reaction mechanism. Aiming at the existing problems of the mineralization curing technology, this paper, starting from the perspective of the mineralization process, deeply explores the influencing factors and the shaping effect on the microstructure, and finally clarifies the correlation mechanism among the mineralization reaction process, the change of the microstructure, the optimization of the macroscopic service performance, and the environmental benefits.