ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 68, (3) 389 - 399 (2024)

Shen Yan 1, Wang Peifang 2, Lin Xueshan 1, Li Jiang 1
1 College of Building and Materials, Chongqing College of Electronic Engineering, Chongqing 401331, China
2 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China

Keywords: Ternesite-ye'elimite cement, Ternesite, Gypsum, Mechanical strength, Hydration

A new type of ternesite-ye'elimite (TCSA) cement was prepared with different amounts of ternesite. The effect of the ternesite content on the mechanical properties and hydration products of cement pastes was studied. The influence of the added gypsum content on the performance of TCSA cement was also discussed. The results showed that increasing the contents of ternesite prolonged the setting times of the TCSA clinkers. Increasing the ternesite content promoted the strength development. The increase in the ternesite content caused the lower expansion of the TCSA clinkers. The formation of ettringite, strätlingite and monosulfate was observed in the hydrated clinker pastes. The amount of strätlingite and monosulfate decreased at 28 days, while the formation of ettringite continued to increase due to the hydration of ternesite. The higher added gypsum content increased the compressive strength between 1 and 28 d. However, 15% gypsum was not conducive to the strength development at later ages. In the presence of gypsum, the formation of strätlingite was not observed. A higher gypsum content favoured ettringite precipitation at 1 d, but excess gypsum hindered the ternesite hydration.

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doi: 10.13168/cs.2024.0038
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