Effect of Compounding Calcium-Magnesium Expansive Agent with SAP on the Shrinkage Performance of UHPC
LIU Jianhui1,*, YANG Wuwei1, SU Weiwei1, TANG Zhongyi1, CHEN Zheng1, SHI Caijun2
1 School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2 College of Civil Engineering, Hunan University, Changsha 410082, China
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.
刘剑辉, 杨五卫, 苏炜炜, 汤中亿, 陈正, 史才军. 钙镁膨胀剂与SAP复掺对UHPC收缩特性的影响[J]. 材料导报, 2025, 39(19): 24080191-10.
LIU Jianhui, YANG Wuwei, SU Weiwei, TANG Zhongyi, CHEN Zheng, SHI Caijun. Effect of Compounding Calcium-Magnesium Expansive Agent with SAP on the Shrinkage Performance of UHPC. Materials Reports, 2025, 39(19): 24080191-10.
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