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A platform for research: civil engineering, architecture and urbanism
Study on hydration mechanism of Ternesite-Ye’elimite binary system
https://orcid.org/0000-0002-3555-5992
Abstract Calcium sulfoaluminate (CSA) cement attracts attention for its low carbon emissions, but the reaction mechanism of ternesite (C5S2$) and ye’elimite (C4A3$) remains unclear. In this work, the hydration process of C5S2$, C4A3$, and the C5S2$-C4A3$ (TY) binary system were studied. The cumulative heat release of the TY binary system depends on the content of C4A3$, the highest cumulative heat in the system is TY-F about 250 J/g. The pore solution analysis reveals that C5S2$ dissolves slowly in contact with water, releasing Ca2+, SO4 2- and OH- at the initial hydration. The C5S2$ is activated by C4A3$, the degree of C5S2$ in TY system is approximately 40%. In the hydration of the TY binary system, the dissolution of C5S2$ produces gypsum at an early age, while the other hydration products (strätlingite, C-S-H) are slowly form after 28d of hydration. The presence of C5S2$ reduces the crystallinity of monosulfate(AFm) and aluminum hydroxide(AH3), resulting in an amorphous content of up to 40–50% in the TY system after 90 days of hydration. Based on the experimental data, when the mass ratio of C4A3$/C5S2$ is lower than 1, C2ASH8 was detected by XRD, the content of C2ASH8 was 17.50% in the TY-A system after 90 d of hydration.
Highlights The hydration process of the C5S2$-C4A3$ system was studied. The hydration degree of C5S2$ in the system could reach over 40%. The presence of C5S2$ affects the crystallinity of AFm and AH3. The C4A3$/C5S2$ (≤1) favors the stabilization of the AFt and the formation of strätlingite.
Study on hydration mechanism of Ternesite-Ye’elimite binary system
https://orcid.org/0000-0002-3555-5992
Abstract Calcium sulfoaluminate (CSA) cement attracts attention for its low carbon emissions, but the reaction mechanism of ternesite (C5S2$) and ye’elimite (C4A3$) remains unclear. In this work, the hydration process of C5S2$, C4A3$, and the C5S2$-C4A3$ (TY) binary system were studied. The cumulative heat release of the TY binary system depends on the content of C4A3$, the highest cumulative heat in the system is TY-F about 250 J/g. The pore solution analysis reveals that C5S2$ dissolves slowly in contact with water, releasing Ca2+, SO4 2- and OH- at the initial hydration. The C5S2$ is activated by C4A3$, the degree of C5S2$ in TY system is approximately 40%. In the hydration of the TY binary system, the dissolution of C5S2$ produces gypsum at an early age, while the other hydration products (strätlingite, C-S-H) are slowly form after 28d of hydration. The presence of C5S2$ reduces the crystallinity of monosulfate(AFm) and aluminum hydroxide(AH3), resulting in an amorphous content of up to 40–50% in the TY system after 90 days of hydration. Based on the experimental data, when the mass ratio of C4A3$/C5S2$ is lower than 1, C2ASH8 was detected by XRD, the content of C2ASH8 was 17.50% in the TY-A system after 90 d of hydration.
Highlights The hydration process of the C5S2$-C4A3$ system was studied. The hydration degree of C5S2$ in the system could reach over 40%. The presence of C5S2$ affects the crystallinity of AFm and AH3. The C4A3$/C5S2$ (≤1) favors the stabilization of the AFt and the formation of strätlingite.
Study on hydration mechanism of Ternesite-Ye’elimite binary system
https://orcid.org/0000-0002-3555-5992
Abstract Calcium sulfoaluminate (CSA) cement attracts attention for its low carbon emissions, but the reaction mechanism of ternesite (C5S2$) and ye’elimite (C4A3$) remains unclear. In this work, the hydration process of C5S2$, C4A3$, and the C5S2$-C4A3$ (TY) binary system were studied. The cumulative heat release of the TY binary system depends on the content of C4A3$, the highest cumulative heat in the system is TY-F about 250 J/g. The pore solution analysis reveals that C5S2$ dissolves slowly in contact with water, releasing Ca2+, SO4 2- and OH- at the initial hydration. The C5S2$ is activated by C4A3$, the degree of C5S2$ in TY system is approximately 40%. In the hydration of the TY binary system, the dissolution of C5S2$ produces gypsum at an early age, while the other hydration products (strätlingite, C-S-H) are slowly form after 28d of hydration. The presence of C5S2$ reduces the crystallinity of monosulfate(AFm) and aluminum hydroxide(AH3), resulting in an amorphous content of up to 40–50% in the TY system after 90 days of hydration. Based on the experimental data, when the mass ratio of C4A3$/C5S2$ is lower than 1, C2ASH8 was detected by XRD, the content of C2ASH8 was 17.50% in the TY-A system after 90 d of hydration.
Highlights The hydration process of the C5S2$-C4A3$ system was studied. The hydration degree of C5S2$ in the system could reach over 40%. The presence of C5S2$ affects the crystallinity of AFm and AH3. The C4A3$/C5S2$ (≤1) favors the stabilization of the AFt and the formation of strätlingite.
Study on hydration mechanism of Ternesite-Ye’elimite binary system
Wu, Yufeng (author) / Li, Pengcheng (author) / Huang, Xiaofei (author) / Li, Weifeng (author) / Sun, Jinfeng (author) / Ma, Suhua (author)
2024-03-02
Article (Journal)
Electronic Resource
English
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