摘   要：水泥基材料是工程结构中至关重要的基础材料之一，其碳化反应是导致结构耐久性能退化的主要机制，而现有相关研究多依托宏观性能指标开展，难以精准表征碳化过程中的三维应变演化规律与细观损伤特征。为此，本文联合X射线微断层成像（X-ray microtomography，X-μCT）与数字体图像相关法（Digital volume correlation，DVC）技术，开展了碳化过程中砂浆试件内部应变分布与裂纹演化的三维定量表征研究，揭示了界面过渡区的应变集中与碳化诱导裂纹张开机制。结果表明：试件在碳化过程中整体表现出持续收缩的特征，而裂缝、孔隙等缺陷区域会出现局部膨胀效应；收缩主要集中于水泥浆体区域，尤其在细骨料与浆体的界面过渡区更为明显，但整体分布未呈现显著方向性规律；碳化会诱导试件出现裂缝张开现象，表明碳化反应不仅导致基体收缩，还可诱发裂纹扩展。研究成果揭示了碳化过程中水泥基材料微观结构与应变场的演化规律，可为理解碳化对材料耐久性能退化的机制提供试验依据，也可为工程结构的寿命预测与耐久性能设计提供参考。Abstract: Cementitious materials are among the most important basic materials in engineering structures, and their carbonation reaction constitutes a primary mechanism leading to structural durability degradation. However, most existing studies are conducted based on macroscopic performance indicators, which makes it difficult to accurately characterize the three-dimensional strain evolution and mesoscopic damage characteristics during carbonation. To address this issue, this study combines X-ray micro-computed tomography (X-μCT) and digital volume correlation (DVC) techniques to conduct three-dimensional quantitative characterization of the internal strain distribution and crack evolution in mortar specimens during carbonation, revealing strain concentration in the interfacial transition zone and the mechanism of carbonation-induced crack opening. The results show that the specimens exhibit continuous overall shrinkage during carbonation, while local expansion effects occur in defective regions such as cracks and pores. Shrinkage is mainly concentrated in the cement paste matrix, particularly in the interfacial transition zone between fine aggregates and the paste, without an obvious directional pattern in the overall distribution. Carbonation can induce crack opening in specimens, indicating that the carbonation reaction not only causes matrix shrinkage, but also promotes crack propagation. The findings reveal the evolution laws of the microstructure and strain field of cementitious materials during carbonation, which can provide 

张冬梅,左晓宝.基于X-μCT与DVC技术的水泥基材料碳化应变定量表征[J].混凝土与水泥制品,2026,53(5):94-99. ZHANG D M,ZUO X B.Quantitative characterization of carbonation-induced strain in cementitious materials using X-μCT and DVC techniques[J].China Concrete and Cement Products,2026,53(5):94-99 (in Chinese).

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