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Article

Exploring the Influence Factors of Early Hydration of Ultrafine Cement

Metals & Chemistry Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China
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Academic Editor: Andrea Petrella
Materials 2021, 14(19), 5677; https://doi.org/10.3390/ma14195677
Received: 2 September 2021 / Revised: 24 September 2021 / Accepted: 25 September 2021 / Published: 29 September 2021
This work intends to contribute to the understanding of the influence factors of early hydration of ultrafine cement by focusing on the different fineness, different kinds of hardening accelerators, and different curing temperatures. Isothermal calorimetry, thermogravimetry, and X-ray diffraction (XRD) were performed to compare the hydration and chemical evolution of pastes containing accelerators with different fineness and curing temperatures; meanwhile, mechanical properties and water absorption were tested. The results showed that the cement fineness had a significant effect on the early hydration process; the smaller the cement particle size, the higher the early compressive strength. The 24 h compressive strength of ultrafine cement with a particle diameter of 6.8μm could reach 55.94 MPa, which was 118% higher than the reference cement. Water absorption test results indicated that adding 1% Ca(HCOO)2 to ultrafine cement can effectively reduce the water absorption, and it was only 1.93% at 28 d, which was 46% lower than the reference cement. An increase in curing temperature accelerated the activation of ultrafine cement in terms of the strength development rate, and the content of Ca(OH)2 in the ultrafine cement paste could reach 13.09% after being mixed with water for 24 h, which was 22% higher than that of the reference cement. View Full-Text
Keywords: ultrafine cement; hardening accelerators; curing condition ultrafine cement; hardening accelerators; curing condition
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MDPI and ACS Style

Shi, Y.; Wang, T.; Li, H.; Wu, S. Exploring the Influence Factors of Early Hydration of Ultrafine Cement. Materials 2021, 14, 5677. https://doi.org/10.3390/ma14195677

AMA Style

Shi Y, Wang T, Li H, Wu S. Exploring the Influence Factors of Early Hydration of Ultrafine Cement. Materials. 2021; 14(19):5677. https://doi.org/10.3390/ma14195677

Chicago/Turabian Style

Shi, Yi, Tao Wang, Haiyan Li, and Shaoliang Wu. 2021. "Exploring the Influence Factors of Early Hydration of Ultrafine Cement" Materials 14, no. 19: 5677. https://doi.org/10.3390/ma14195677

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