Bond performance of steel rebar embedded in high-strength engineered cementitious composites (HS-ECC): Experimental study and reliability design

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-05-14 DOI:10.1016/j.conbuildmat.2025.141681

Yu-Qiang Zhang , Ling-Zhi Li , Bo-Yu Deng , Iftikhor Kalandarbekov , Ke-Quan Yu , Zi-Ming Tang , Zi-Wei Cai

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Abstract

High-strength engineered cementitious composites (HS-ECC) exhibits exceptional tensile strength, ductility, and durability, making it a superior alternative to ordinary concrete and normal-strength ECC (NS-ECC) subjected to complex loading conditions and severe service environments. The bond performance between HS-ECC and steel rebar is critical for the analysis and design of reinforced HS-ECC structures. A total of 56 specimens were fabricated to systematically investigate the bond behavior between HS-ECC and steel rebar. The test parameters included fiber volume content, ECC strength grade, steel rebar diameter, embedded length, and cover thickness. Experimental results revealed that the primary failure modes in HS-ECC pullout specimens were pullout failure and splitting-pullout failure, both demonstrating significantly greater ductility compared to the splitting failure observed in HS-ECC matrix specimens. The bond strength and stiffness between HS-ECC and steel rebar were notably higher than those of NS-ECC. Furthermore, the ultimate bond strength increased with higher fiber volume content and cover thickness, while it decreased as the steel rebar diameter and embedded length increased. Empirical models were developed to calculate the splitting bond strength and pullout bond strength. The critical anchorage length of steel rebar embedded in HS-ECC, smaller than that in NS-ECC, was determined from the pullout bond strength model. Design suggestions for the anchorage lengths were proposed based on reliability analysis, providing a valuable reference for the design of reinforced ECC from normal strength to high strength.

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钢筋嵌入高强工程胶凝复合材料（HS-ECC）粘结性能：试验研究与可靠性设计

高强度工程胶凝复合材料（HS-ECC）表现出卓越的抗拉强度、延展性和耐久性，使其成为普通混凝土和普通强度ECC （NS-ECC）在复杂加载条件和恶劣使用环境下的优越替代品。HS-ECC与钢筋的粘结性能是钢筋HS-ECC结构分析和设计的关键。为了系统地研究HS-ECC与钢筋的粘结行为，共制作了56个试件。试验参数包括纤维体积含量、ECC强度等级、钢筋直径、预埋长度、覆盖厚度。试验结果表明，HS-ECC试件的主要破坏模式为拉拔破坏和劈裂-拉拔破坏，两者的延性均显著高于HS-ECC基体试件的劈裂破坏。HS-ECC与钢筋的粘结强度和刚度均显著高于NS-ECC。随着纤维体积含量和覆盖厚度的增加，粘结强度增大，随着钢筋直径和埋置长度的增加，粘结强度减小。建立了劈裂粘结强度和拉出粘结强度的经验模型。根据拉拔粘结强度模型，确定了HS-ECC中钢筋的临界锚固长度小于NS-ECC中钢筋的临界锚固长度。在可靠度分析的基础上，提出了锚固长度的设计建议，为增强ECC由普通强度向高强度设计提供了有价值的参考。

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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.