Long-term performance of steel fiber reinforced recycled concrete: Creep calculation model based on recycled aggregate attached mortar and the interfacial transition zone of steel fiber

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Construction and Building Materials Pub Date : 2025-04-04 DOI:10.1016/j.conbuildmat.2025.141163

Hanquan Yuan , Lihua Zhu , Xiaopeng Wang

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Abstract

This study investigates the long-term mechanical properties of steel fiber-reinforced recycled concrete (SFRRC) with varying recycled concrete aggregate (RCA) replacement rates (0 %, 50 %, and 100 %) and steel fiber volume contents (0 % and 1 %) through shrinkage and creep tests. Additionally, the interfacial transition zones (ITZ) between RCAs and steel fibers were analyzed using nanoindentation technology to explore the underlying mechanisms driving changes in SFRRC’s long-term mechanical behavior. The results indicate that RCA significantly increases the shrinkage and creep deformation of SFRRC, while steel fibers exert a moderate inhibitory effect on shrinkage and a more pronounced inhibitory effect on creep. Furthermore, steel fibers have a notable impact on ITZ₂ (aggregate-new mortar), the interfacial transition zone in new mortar, but a lesser impact on ITZ₃ (aggregate-old mortar), the cross-sectional transition zone in old mortar. Based on the standard concrete creep calculation formula, this study introduces a modified creep model for SFRRC, incorporating the influence of RCA attached mortar and steel fibers in the ITZ. This model provides valuable experimental data and a theoretical foundation for the future application and promotion of SFRRC.

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钢纤维增强再生混凝土的长期性能：基于再生骨料粘结砂浆和钢纤维界面过渡区的徐变计算模型

通过收缩和徐变试验，研究了不同再生混凝土骨料（RCA）替代率（0 %、50 %和100 %）和钢纤维体积含量（0 %和1 %）下钢纤维增强再生混凝土（SFRRC）的长期力学性能。此外，利用纳米压痕技术分析了RCAs与钢纤维之间的界面过渡区（ITZ），以探索驱动SFRRC长期力学行为变化的潜在机制。结果表明，RCA显著增加了SFRRC的收缩和蠕变变形，而钢纤维对收缩的抑制作用中等，对蠕变的抑制作用更为明显。此外，钢纤维对新砂浆界面过渡区ITZ2（骨料-新砂浆）有显著影响，而对旧砂浆截面过渡区ITZ3（骨料-旧砂浆）影响较小。在标准混凝土徐变计算公式的基础上，引入了一种改进的钢筋混凝土徐变模型，该模型考虑了混凝土混凝土中RCA粘结砂浆和钢纤维的影响。该模型为今后SFRRC的应用和推广提供了有价值的实验数据和理论基础。

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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.