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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Effect of pore water saturation on the supercritical carbonation of cementitious materials
AU - Bao, Hao
AU - Wang, Ruyu
AU - Yang, Yahui
AU - Wang, Qing
AU - Xu, Gang
AU - Saafi, Mohamed
AU - Ye, Jianqiao
PY - 2025/8/5
Y1 - 2025/8/5
N2 - The optimization of pore water saturation is essential to improve the supercritical carbonation efficiency of cementitious materials. In this study, a control method was developed to adjust the pore water saturation of cementitious materials to predetermined target values, thereby achieving a uniform distribution of pore water within the specimens. Based on this approach, a systematic supercritical carbonation test was conducted, the effects of pore water saturation and water-cement ratio on carbonation efficiency was researched by measuring carbonation depth, which reaches its maximum at a pore water saturation of 0.50. The effect of pore water saturation on the supercritical carbonation depth was clarified. Additionally, a novel method was proposed to determine the Ca(OH)2 and C–S–H contents of cementitious materials before carbonation using inverse derivation from the differences in thermogravimetric analysis (TGA) results. Furthermore, microscopic techniques, including scanning electron microscopy (SEM), were employed to investigate the mechanisms of supercritical carbonation in cementitious materials under different pore water saturation levels. The influence of pore water saturation on the carbonation process was thereby elucidated.
AB - The optimization of pore water saturation is essential to improve the supercritical carbonation efficiency of cementitious materials. In this study, a control method was developed to adjust the pore water saturation of cementitious materials to predetermined target values, thereby achieving a uniform distribution of pore water within the specimens. Based on this approach, a systematic supercritical carbonation test was conducted, the effects of pore water saturation and water-cement ratio on carbonation efficiency was researched by measuring carbonation depth, which reaches its maximum at a pore water saturation of 0.50. The effect of pore water saturation on the supercritical carbonation depth was clarified. Additionally, a novel method was proposed to determine the Ca(OH)2 and C–S–H contents of cementitious materials before carbonation using inverse derivation from the differences in thermogravimetric analysis (TGA) results. Furthermore, microscopic techniques, including scanning electron microscopy (SEM), were employed to investigate the mechanisms of supercritical carbonation in cementitious materials under different pore water saturation levels. The influence of pore water saturation on the carbonation process was thereby elucidated.
KW - Carbonation depth
KW - Cementitious materials
KW - C–S–H carbonation
KW - Pore water saturation
KW - Supercritical carbonation
KW - Water to cement ratio
U2 - 10.1617/s11527-025-02740-8
DO - 10.1617/s11527-025-02740-8
M3 - Journal article
AN - SCOPUS:105012591643
VL - 58
JO - Materials and Structures/Materiaux et Constructions
JF - Materials and Structures/Materiaux et Constructions
SN - 1359-5997
IS - 6
M1 - 215
ER -