Effect of CO2 curing on the resistance of calcium sulfoaluminate cement paste to elevated temperature

被引：1
作者：
Wu, Xuanru [1 ]
Sharma, Raju [2 ]
Das, Kunal Krishna [1 ]
Ahn, Jiwhan [3 ]
Jang, Jeong Gook [1 ]
机构：
[1] Incheon Natl Univ, Urban Sci Inst, Div Architecture & Urban Design, 119 Acad Ro, Incheon 22012, South Korea
[2] Univ Sherbrooke, Dept Civil Engn, Cement & Concrete Grp, Sherbrooke, PQ, Canada
[3] Korea Inst Geosci & Mineral Resources, 124 Gwahak Ro, Daejeon 34132, South Korea
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2024年 / 456卷
基金：
新加坡国家研究基金会;
关键词：
CO; 2; curing; Calcium sulfoaluminate cement; Elevated temperature; Thermal stability; Physicochemical property; C-S-H; THERMAL-DECOMPOSITION; CARBONATION; HYDRATION; STRENGTH; ETTRINGITE; STABILITY; ALUMINUM; AL-27; COLOR;
D O I：
10.1016/j.conbuildmat.2024.139338
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This study investigates the effect of CO2 curing on the resistance to elevated temperatures of calcium sulfoaluminate (CSA) cement paste. Water and CO2-cured CSA cement paste specimens were exposed to elevated temperatures of 150 degrees C, 300 degrees C, 500 degrees C, and 800 degrees C to evaluate their physicochemical and mechanical properties. The results demonstrate that CO2 infiltration alters the hydration mechanism of CSA cement, consequently enhancing its physical properties and thermal stability. Exposure to elevated temperatures induces changes in color and the formation of cracks in cement paste samples, with water-cured samples exhibiting more prominent cracks compared to CO2-cured samples. CO2-cured samples demonstrate less of a reduction in the compressive strength at high temperatures compared to water-cured samples, an outcome attributed to the enhanced stability and uniform pore size distribution. In conclusion, the CO2 curing process transforms ettringite and monosulfate into thermally stable calcium carbonate, which significantly enhances the thermal stability of the cement paste.
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页数：10
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