Local bond properties of steel rebar embedded in poured earth concrete: effect of recycled fine aggregate and rebar diameter

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2024-10-10 DOI:10.1617/s11527-024-02470-3

Ali Dheyaa, Seyed Sina Mousavi, Mehdi Dehestani

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Abstract

The use of poured earth concrete (PEC) as a sustainable alternative to traditional concrete has been gaining popularity. However, there are challenges with the interfacial properties between rebar and concrete, and no research is dedicated to addressing this issue. Accordingly, an experimental program is conducted in the present study to measure the bond properties in PEC. Various rebar diameters of 14 mm, 18 mm, and 25 mm are considered. Different fine aggregate replacement percentages by recycled aggregate (RA) are also selected to improve PEC’s sustainability, including 30%, 50%, and 100%. A constant effective water-to-binder ratio of 0.50 is chosen. Various local bond characteristics are measured from the bond-slip envelope curves, including average bond stress, bond strength, residual bond stress, and bond energy. Results show that despite the low strength, appropriate bond properties along with pull-out failure mode can be obtained for PEC samples. Increasing rebar diameter considerably reduces the bond properties of PEC specimens and causes splitting failure mode. Higher contents of RA result in a reduction in bond properties, so that 30% fine aggregate replacement is the optimum content of RA. A new bond-predicting model is also proposed in the present study for PEC samples containing RA.

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浇筑土方混凝土中预埋钢筋的局部粘结性能：再生细骨料和钢筋直径的影响

使用浇筑土混凝土（PEC）作为传统混凝土的可持续替代品已越来越受欢迎。然而，钢筋与混凝土之间的界面性能存在挑战，目前还没有专门针对这一问题的研究。因此，本研究开展了一项实验计划，以测量 PEC 的粘结性能。实验中考虑了 14 毫米、18 毫米和 25 毫米的各种钢筋直径。为提高 PEC 的可持续性，还选择了不同的再生骨料（RA）替代细骨料的比例，包括 30%、50% 和 100%。选择的有效水与粘合剂比率恒定为 0.50。通过粘结-滑动包络曲线测量了各种局部粘结特性，包括平均粘结应力、粘结强度、残余粘结应力和粘结能。结果表明，尽管 PEC 样品的强度较低，但仍能获得适当的粘结特性和拉拔失效模式。增加钢筋直径会大大降低 PEC 试样的粘结性能，并导致劈裂破坏模式。较高的 RA 含量会降低粘结性能，因此 30% 的细集料替代率是最佳的 RA 含量。本研究还针对含有 RA 的 PEC 试样提出了一种新的粘结预测模型。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.