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Review on CO2 curing of non-hydraulic calcium silicates cements: Mechanism, carbonation and performance
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2022-06-22 , DOI: 10.1016/j.cemconcomp.2022.104641
Xiaoli Wang , Ming-Zhi Guo , Tung-Chai Ling

The manufacture of cement is associated with a large amount of CO2 emissions. Mineral carbonation technology (MCT) has been identified as one of the viable solutions to reduce the high environmental impacts of cement and concrete production via a long-term storage of atmospheric CO2 as stable forms of carbonates in cement-based products. This article reviews the status quo of hydration and carbonation activities of all calcium silicates system, especially three main non-hydraulic calcium-silicate-based binders (e.g. γ-C2S, C3S2 and CS). The influence of mineral structure on the types of carbonation products is examined to fundamentally explain the evolution of carbonation products and provide a solid theoretical basis for a wider application of carbonation technology in the future. Finally, effective measures to improve the carbonation performance are comprehensively discussed from the aspects of CO2 concentration, relative humidity, carbonation temperature, W/C ratio, etc., to highlight the potential of non-hydraulic calcium-silicate-based binders in reducing the global cement-associated CO2 emissions.



中文翻译:

非水硬性硅酸钙水泥的二氧化碳固化综述:机理、碳化和性能

水泥的制造与大量的 CO 2排放有关。矿物碳化技术 (MCT) 已被确定为通过将大气中的 CO 2作为稳定形式的碳酸盐在水泥基产品中长期储存来减少水泥和混凝土生产对环境的高影响的可行解决方案之一。本文回顾了所有硅酸钙体系,尤其是三种主要的非水硬性硅酸钙基粘合剂(如γ-C 2 S、C 3 S 2和 CS)。研究矿物结构对碳化产物类型的影响,从根本上解释碳化产物的演变过程,为未来碳化技术的更广泛应用提供坚实的理论基础。最后从CO 2浓度、相对湿度、碳化温度、W/C比等方面综合探讨了提高碳化性能的有效措施,突出了非水硬性硅酸钙基粘结剂在降低碳化方面的潜力。全球与水泥相关的 CO 2排放量。

更新日期:2022-06-22
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