Study on Pore Structure of UHPC Based on CT and NMR Techniques
WANG Zhangxiang1, JIN Lang2, CHEN Peixin3, CHEN Feixiang2, YAO Tianyu1, CHEN Xudong1,*
1 School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, China 2 CCCC Second Harbor Engineering Company Ltd., Wuhan 430040, China 3 China Railway 14th Bureau Group Corporation Limited, Jinan 250101, China
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.
王张翔, 金浪, 陈培鑫, 陈飞翔, 姚天豫, 陈徐东. 基于CT和NMR技术的UHPC孔隙结构研究[J]. 材料导报, 2025, 39(5): 24020073-6.
WANG Zhangxiang, JIN Lang, CHEN Peixin, CHEN Feixiang, YAO Tianyu, CHEN Xudong. Study on Pore Structure of UHPC Based on CT and NMR Techniques. Materials Reports, 2025, 39(5): 24020073-6.
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2025, Vol. 39 
