Confinement effects on bond strength of deformed reinforcement in early-age concrete

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

Construction and Building Materials Pub Date : 2024-11-26 DOI:10.1016/j.conbuildmat.2024.139310

Wenming Li , Zhimin Wu , Jianzhuang Xiao

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引用次数: 0

Abstract

The stress state in concrete around deformed reinforcements has a significant influence on the coordinated performance between the deformed reinforcement and concrete. Although the bond strength of deformed reinforcements embedded in mature concrete has been well studied, there is still a lack of research on the bond strength of deformed reinforcement in early-age concrete under lateral pressures. In this paper, 180 pullout specimens were designed to reveal the effect of age and lateral pressure on bond strength, and a theoretical analysis model for predicting bond strength was also presented. Test results showed that the bond failure modes were closely related to the lateral pressures, relative cover thickness of concrete, and early-age concrete strength. The bond strength increased following the curing age but was negatively (positively) influenced by the unilateral (bilateral) pressures. Based on the test results, a regression model for predicting the bond strength of the deformed reinforcement in early-age concrete under lateral pressures was proposed. Furthermore, an analysis model based on the partly cracked theory was extended for predicting the bond strength of the deformed reinforcement in early-age concrete considering the lateral pressures and fitted the experimental results quite well.

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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.