In-situ 4D CT scanning and digital volume correlation for 3D kinematic field analysis in high-toughness recycled aggregate concrete

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2024-11-12 DOI:10.1016/j.conbuildmat.2024.139075

Changqing Wang , Zhicheng Du , Zhiyu Zhang , Youchao Zhang , Zhiming Ma

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Abstract

In the field of green building materials, the development of high-toughness recycled aggregate concrete (HTRAC) is crucial for sustainable construction. This study employs in-situ 4D CT technology to observe the meso-structural changes in HTRAC under uniaxial loading, with a focus on the spatial distribution of pores and fibers, as well as the formation and evolution of cracks. Additionally, digital volume correlation (DVC) is utilized to visually analyze the internal strain environment. The results demonstrate the material's heterogeneity and its localized effects on stress/strain distribution, revealing significant differences in crack morphology and strain distribution between recycled coarse aggregate (RCA) interfaces and fiber regions. The inclusion of microsteel fibers enhances crack resistance and toughness, resulting in an increase of the toughness index by 114 %, effectively dispersing stress and impeding crack propagation, thereby improving the material's overall structural performance. A damage evolution model, derived from strain statistical analysis during the HTRAC failure process, offers theoretical and technical support for the design and application of HTRAC in construction.

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用于高韧性再生骨料混凝土三维运动场分析的原位四维 CT 扫描和数字体积相关技术

在绿色建材领域，开发高韧性再生骨料混凝土（HTRAC）对可持续建筑至关重要。本研究采用原位四维 CT 技术观察 HTRAC 在单轴荷载作用下的中观结构变化，重点关注孔隙和纤维的空间分布以及裂缝的形成和演变。此外，还利用数字体积相关（DVC）对内部应变环境进行了直观分析。结果表明了材料的异质性及其对应力/应变分布的局部影响，揭示了再生粗集料（RCA）界面和纤维区域之间在裂缝形态和应变分布上的显著差异。微钢纤维的加入增强了抗裂性和韧性，使韧性指数提高了 114%，有效分散了应力，阻碍了裂纹扩展，从而改善了材料的整体结构性能。根据 HTRAC 失效过程中的应变统计分析得出的损伤演变模型，为 HTRAC 在建筑中的设计和应用提供了理论和技术支持。

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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.