Experimental study on bond performance of recycled coarse aggregates concrete with circular steel tubes after freeze–thaw cycling

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Structural Concrete Pub Date : 2024-08-21 DOI:10.1002/suco.202400110

Dongxia Hu, Jin Wu, Zhe Feng, Liqiang Liu

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Abstract

Extrusion tests were conducted on recycled coarse aggregate concrete with circular steel tubes (RCCST, 100% replacement of recycled coarse aggregate) to investigate the impact of freeze–thaw cycles on bond properties. RCCST samples were subjected to 0, 25, 50, 75, 100, 125 and 150 freeze–thaw cycles and their bond properties were then compared with those of natural coarse aggregate concrete with circular steel tubes (NCCST) after 0, 100 and 150 freeze–thaw cycles. The experimental results indicate that freeze–thaw cycling damages the internal structure of RCCST, causing a significant decrease in interfacial bond strength with an increase in the number of freeze–thaw cycles. Freeze–thaw RCCST exhibits lower peak load and higher peak slip compared to NCCST, with increases of 25.2%, 73.2%, and 70.3% after 0, 100, and 150 freeze–thaw cycles, respectively. Regression analysis was used to derive an exponential equation that describes the relationship between longitudinal strain and strain gauge position. Additionally, a segmented fitting method was employed to obtain an expression for the bond slip of the freeze–thaw RCCST with a circular steel pipe.

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带圆形钢管的再生粗骨料混凝土冻融循环后的粘结性能实验研究

对带圆形钢管的再生粗骨料混凝土（RCCST，100% 替代再生粗骨料）进行了挤压试验，以研究冻融循环对粘结性能的影响。对 RCCST 样品进行了 0、25、50、75、100、125 和 150 次冻融循环，然后将其粘结性能与天然粗骨料圆形钢管混凝土（NCCST）在 0、100 和 150 次冻融循环后的粘结性能进行了比较。实验结果表明，冻融循环会破坏 RCCST 的内部结构，导致界面粘结强度随着冻融循环次数的增加而显著下降。与 NCCST 相比，冻融 RCCST 表现出更低的峰值载荷和更高的峰值滑移，在 0、100 和 150 次冻融循环后分别增加了 25.2%、73.2% 和 70.3%。通过回归分析得出了一个指数方程，用于描述纵向应变与应变片位置之间的关系。此外，还采用了分段拟合方法，得出了冻融 RCCST 与圆形钢管粘结滑移的表达式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.