基于CT和NMR技术的UHPC孔隙结构研究

doi:10.11896/cldb.24020073

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Abstract In order to study the effect of spraying process on the pore structure of ultra-high performance concrete (UHPC), the UHPC with two construction modes of spraying and molding was designed. The uniformity of the pore distribution, micrometer-level pore size distribution and fiber distribution in sprayed UHPC were analyzed through three-dimensional reconstruction and visualization analysis of images used computerized tomography (CT), and the pore network model and fiber distribution model constructed by means of the watershed algorithm and search-cone algorithm, respectively. Furthermore, nuclear magnetic resonance (NMR) technology was employed to study the pore size distribution of sprayed UHPC at a finer scale, and the T₂ spectrum was used to obtain the pore size distribution. The results show that both molding and spraying UHPC have a main distribution of non-connected pores. The uniformity of the pore distribution in sprayed UHPC decreases, and its pore size distribution tends to be small and dense. Spraying rebound causes different degrees of increase in the porosity of UHPC, among which about 1.5% are harmless pores and only about 0.2% are non-capillary harmful pores. The spraying process also affects the fiber distribution in UHPC, and the fibers in sprayed UHPC distribute more evenly along the Z-axis (the spraying direction), and tend to be parallel to the sprayed surface in a two-dimensional chaotic distribution.

Key words： sprayed UHPC CT nuclear magnetic resonance pore size distribution fiber distribution pore uniformity

Published: 10 March 2025 Online: 2025-03-18

CLC number:

TU528.53

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	Articles by authors
	WANG Zhangxiang
	JIN Lang
	CHEN Peixin
	CHEN Feixiang
	YAO Tianyu
	CHEN Xudong

Cite this article:

WANG Zhangxiang,JIN Lang,CHEN Peixin, et al. Study on Pore Structure of UHPC Based on CT and NMR Techniques[J]. Materials Reports, 2025, 39(5): 24020073-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24020073 OR https://www.mater-rep.com/EN/Y2025/V39/I5/24020073

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