文献类型：期刊文献

英文题名：New perspectives on utilization of CO2 sequestration technologies in cement-based materials

作者：Liu, Baoju[1];Qin, Jiali[1];Shi, Jinyan[1];Jiang, Junyi[1];Wu, Xiang[1];He, Zhihai[2]

机构：[1]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China

年份：2021

卷号：272

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000610197700049)、、WOS

基金：This research work was financially supported by the National Key R&D Program of China (2017YFB1201204).

语种：英文

外文关键词：Cement-based materials; Sequestration technology; Construction and demolition waste; Carbonated recycled aggregate; Performance improvement

外文摘要：With the development of the construction industry, global CO2 emissions are closely related to the utilization of cement-based materials (CBM). The calcium-silicate-based cement, as well as construction and demolition waste is calcium-rich, and both of them are considered as the main sources of mineral carbonation to transform CO2 into thermochemically stable carbonates. Therefore, accelerated carbonation can be used in not only the early-age curing stage but also the reused stage of CBM, providing an approach for large-scale CO2 sequestration. This paper focuses on the carbonation mechanism, CO2 curing technology, as well as the effects of accelerated carbonation on the microstructure, mechanical properties and durability of CBM in detail. The results showed that early-age CO2 curing could densify the microstructure, thus enhancing the mechanical properties, impermeability and durability of CBM. In addition, CO2 sequestration could improve not only the physical properties of recycled aggregates (RA) and waste cement, but also the microstructure and performance of prepared recycled concretes, thus promoting the reutilization of RA and waste cement in CBM. It follows that the correct utilization of CO2 sequestration technologies in CBM can not only achieve environmental benefits, but provide a new perspective for the development of the construction industry. Finally, based on this review, limitations of the existing studies are identified and the prospects that might be helpful for potential further investigation are given on the utilization of CO2 sequestration technologies in CBM. (C) 2020 Elsevier Ltd. All rights reserved.