Micro-mechanical performance study of the interfacial transition zone in ultra-high performance concrete containing coarse aggregates based on digital image correlation method

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-14 DOI:10.1016/j.conbuildmat.2024.139162

Ziqi Gao , Jintao He , Ruoxi Yang , Feipeng Zhu , Pengxiang Bai , Dong Lei

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Abstract

To measure the mechanical properties of the interfacial transition zone (ITZ) in ultra-high performance concrete with coarse aggregates (UHPC-CA) under direct load, a mesoscopic experimental analysis is performed using a combination of an electron microscope (EM) camera and digital image correlation (DIC) technology in this study. With such a methodology, the stress-strain curve of the ITZ under compression is measured directly. Furthermore, the distribution of the nominal compressive elastic modulus (E*) and Poisson's ratio (v) of the ITZ is obtained. Finally, the effects of granulated blast-furnace slag (GGBS) contents (0 %, 30 %, 40 %, and 50 %) on ITZ’s properties are investigated, and their relevance to microstructure is further explored by scanning electron microscope (SEM). The results indicate that the E * in the ITZ follows a 'U'-shaped distribution. In comparison to the reinforced matrix, a compaction process in ITZ is observed obviously, resulting in a smaller v in this region. Besides, as the GGBS content increases, the mesoscopic mechanical properties of the ITZ gradually decline.

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基于数字图像相关法的含粗集料超高性能混凝土界面过渡区微观力学性能研究

为了测量粗集料超高性能混凝土（UHPC-CA）界面过渡区（ITZ）在直接荷载作用下的力学性能，本研究结合使用了电子显微镜（EM）相机和数字图像相关（DIC）技术，进行了介观实验分析。通过这种方法，可以直接测量 ITZ 在压缩条件下的应力-应变曲线。此外，还获得了 ITZ 的名义压缩弹性模量（E*）和泊松比（v）的分布情况。最后，研究了粒化高炉矿渣（GGBS）含量（0%、30%、40% 和 50%）对 ITZ 性能的影响，并通过扫描电子显微镜（SEM）进一步探讨了它们与微观结构的相关性。结果表明，ITZ 中的 E * 呈 "U "型分布。与增强基体相比，ITZ 中的压实过程明显，导致该区域的 V 值较小。此外，随着 GGBS 含量的增加，ITZ 的中观力学性能逐渐下降。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.