钙镁膨胀剂与SAP复掺对UHPC收缩特性的影响

doi:10.11896/cldb.24080191

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Abstract Excessive autogenous shrinkage of ultra-high performance concrete (UHPC) has always been a key problem restricting its utilization. In this work, the influence of high activity CaO-based expansive agent, low activity MgO-based expansive agent and super absorbent polymer (SAP) on the shrinkage characteristics of UHPC was investigated through the simplex-centroid mixture design method, and the synergistic mec-hanism of calcium-magnesium expansive agent and SAP was revealed with the help of X-ray diffraction analysis (XRD), heat of hydration analysis, thermogravimetric analysis (TG-DTG) and scanning electron microscopy (SEM). The results show that the compound doping of calcium-magnesium expansive agent has a synergistic effect, under the dual effect of hydration promotion of CaO and hydration inhibition of MgO, the UHPC shrinkage compensation is large, the compensation period is significantly prolonged, and the impact on the development of strength is relatively small, and the autogenous shrinkage of the compound system was reduced by 45.3% at 7 d, and by 50.41% at 60 d. The water in the internal curing agent SAP is able to be gradually released to promote the hydration of the expansive agent during this process, resulting in the ge-neration of more expansion products. When CaO, MgO and SAP are mixed together, even in a low dosage, it can still produce a good inhibition effect on the autogenous shrinkage of the UHPC and further prolong the expansion period.

Key words： ultra-high performance concrete calcium-magnesium expansive agent internal curing agent simplex-centroid mixture design method autogenous shrinkage

Published: Online: 2025-09-24

CLC number:

TU528

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	Articles by authors
	LIU Jianhui
	YANG Wuwei
	SU Weiwei
	TANG Zhongyi
	CHEN Zheng
	SHI Caijun

Cite this article:

LIU Jianhui,YANG Wuwei,SU Weiwei, et al. Effect of Compounding Calcium-Magnesium Expansive Agent with SAP on the Shrinkage Performance of UHPC[J]. Materials Reports, 2025, 39(19): 24080191-10.

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https://www.mater-rep.com/EN/10.11896/cldb.24080191 OR https://www.mater-rep.com/EN/Y2025/V39/I19/24080191

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