硫铝酸盐水泥对硅酸盐水泥早期水化和力学性能的影响

摘要/Abstract

摘要： 装配式建筑推动了建筑行业的快速转型,实现构件的快速脱模是实现装配式行业快速发展的基础。本文研究了硫铝酸盐水泥(CSA)在低取代率(水泥质量的2.5%~7.5%)下对硅酸盐水泥早期水化性能和力学性能的影响规律,通过凝结时间、抗压强度、水化热、XRD、TG、SEM等测试手段揭示其作用机理,为实现装配式构件快速脱模提供解决思路。结果表明,CSA的掺入可以缩短硅酸盐水泥的凝结时间,促进水泥的早期水化,提高早期力学性能。当CSA从2.5%增加到7.5%时,水泥初凝时间分别降低了30%、43%和49%,终凝时间分别降低了24%、40%和46%;5%CSA掺量可使水泥样品12 h抗压强度从5.2 MPa提高到12.8 MPa,提高了169%;此外,CSA的掺入对水泥样品后期力学性能也有一定提升作用。

关键词: 硫铝酸盐水泥, 硅酸盐水泥, 早期水化, 装配式建筑, 力学性能, 凝结时间

Abstract: The prefabricated construction has rapidly transformed the building industry, and achieveing the swift demolding of component is fundamental for the rapid development of prefabricated industry. The effects of sulphoaluminate cement (CSA) at low replacement rate (from 2.5% to 7.5% of cement mass) on the early hydration and mechanical properties of Portland cement were studied. Setting time, compressive strength, hydration heat, XRD, TG, and SEM were used to expose to the behind mechanism, providing solutions for the rapid demolding of prefabricated component. The result show that the incorporation of CSA can shorten the setting time of Portland cement, enhance early hydration, and improve early mechanical properties. With the increase of the CSA mass fraction from 2.5% to 7.5%, the initial setting time reduces by 30%, 43% and 49% respectively, and the final setting time by 24%, 40% and 46%, respectively. 5% mass fraction of CSA increases the 12 h compressive strength from 5.2 MPa to 12.8 MPa, an increase of 169%. Additionally, CSA also improves the later-stage mechanical properties of the system.

Key words: sulphoaluminate cement, Portland cement, early hydration, prefabricated construction, mechanical property, setting time

中图分类号:

TU377.1

张琰, 黄业胜, 刘佳龙, 曹昊煜, 李伟, 刘颖, 肖群安, 张小颖, 谢丰蔚. 硫铝酸盐水泥对硅酸盐水泥早期水化和力学性能的影响[J]. 硅酸盐通报, 2024, 43(10): 3552-3560.

ZHANG Yan, HUANG Yesheng, LIU Jialong, CAO Haoyu, LI Wei, LIU Ying, XIAO Qunan, ZHANG Xiaoying, XIE Fengwei. Effect of Sulphoaluminate Cement on Early Hydration and Mechanical Properties of Portland Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(10): 3552-3560.

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