Quantitative characterization of pore properties of concrete under on-site curing pressure

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-10-12 DOI:10.1617/s11527-025-02812-9

Bei Tang, Wei Cui, Bao-zeng Zhang, Zhi-an Jiang

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Abstract

Concrete cured within curing pressure is a universal phenomenon for underground concrete structures. Most researches mainly focused on the effect of pressure total porosity and simple surface morphology of the pores in concrete. However, there is a lack of full understanding regarding the pore characteristics of concrete under ultra-deep formation condition (over 100 m). This study aims to investigate the impact of on-site curing pressure on the internal pore structure of concrete. This study analyzed the pore spatial distribution, the pore size-based characteristics, the pore shape-based characteristics and the pore tortuosity properties of concrete sample under varying curing pressure. The result shows that internal pore structure of concrete sample exhibited remarkable uniformity and well-dispersed network under high curing pressure. With curing pressure increased from 0 to 2 MPa, it could be observed that there was a more homogeneous pore spatial distribution, high small-sized pores fraction and uniform equivalent pore diameter in concrete. The curing pressure also could inhibit the development of flattened and elongated pores in the concrete system. The pressurized sample exhibited a more tortuous path on the horizontal direction and vertical direction. This suggests that the concrete samples cured in high curing pressure would present a better structural integrity and durability.

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现场养护压力下混凝土孔隙特性的定量表征

混凝土在养护压力下养护是地下混凝土结构普遍存在的现象。大多数研究主要集中在压力、总孔隙率和简单表面形貌对混凝土孔隙的影响上。然而，对于超深地层条件下（超过100 m）混凝土的孔隙特征，目前还缺乏充分的认识。本研究旨在探讨现场养护压力对混凝土内部孔隙结构的影响。研究分析了不同养护压力下混凝土试样的孔隙空间分布、孔隙尺寸特征、孔隙形状特征及孔隙扭曲特性。结果表明：在高养护压力下，混凝土试样内部孔隙结构表现出显著的均匀性和分散良好的网状结构；当养护压力从0增大到2 MPa时，混凝土孔隙空间分布更加均匀，小孔隙比例增大，等效孔径更加均匀。养护压力还可以抑制混凝土体系中扁平和细长孔隙的发展。受压试样在水平方向和垂直方向上均表现出更为曲折的路径。这说明在高养护压力下养护的混凝土试件具有较好的结构完整性和耐久性。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.