超细粉体和减水剂对超高性能混凝土新拌性能的影响

doi:10.11896/cldb.24030270

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Abstract By establishing a method for determining and testing the pulping time, the impact of ultra-fine powder and superplasticizer on the mixing process of ultra-high performance concrete (UHPC) was investigated. The adsorption amount of superplasticizer, particle packing density and water film thickness were tested to reveal the mechanism of pulping time based on particle packing behavior. The results show that UHPC during the mixing process undergoes a wet particle formation period, a wet particle growth period, and a critical state of coacervate (pulping state), and then quickly forms agglomerates and transforms into a paste. The criteria for the pulping state and the pulping time test methods are proposed. Compared with ultra-fine powder, the superplasticizer has less impact on pulping time of UHPC. The pulping time of micron particle system is significantly shorter than that of nanoparticle system, and the pulping time of spherical particle system is significantly shorter than that of irregular particle system. The particle packing density and the water film thickness are the keys to controlling the pulping time, among these, the water film thickness determines the base and range of the pulping time, and the particle packing density and the water film thickness determine the variation pattern of the pulping time.

Key words： ultra-high performance concrete ultra-fine powder superplasticizer fresh performance particle packing density water film thickness

Published: 25 May 2025 Online: 2025-05-13

CLC number:

TU528

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	Articles by authors
	YU Xuejuan
	ZHENG Xiaobo
	LIU Jianzhong
	HAN Fangyu
	SHA Jianfang
	FANG Ruoquan

Cite this article:

YU Xuejuan,ZHENG Xiaobo,LIU Jianzhong, et al. Effect of Ultra-fine Powder and Superplasticizer on Fresh Performance of Ultra-high Performance Concrete[J]. Materials Reports, 2025, 39(10): 24030270-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24030270 OR https://www.mater-rep.com/EN/Y2025/V39/I10/24030270

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