改善混凝土中近表面安装的带肋钢筋和经过处理的钢筋的粘结性能

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Sabry Fayed, Emrah Madenci, Yasin Onuralp Özkiliç, Mohamed H. Zakaria
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引用次数: 0

摘要

本研究介绍了对近表面安装(NSM)中使用的螺纹/带肋钢棒的粘结效率进行的二十次拉出试验的实验结果。在尺寸为 250 × 250 × 200 毫米的混凝土块的一个侧面开槽(20 × 20 毫米),进行了拉出实验。主要因素包括槽填充材料(基底混凝土和环氧树脂浆)、粘结长度(等于 5、7、10 和 15 倍杆直径)、表面图案条件(常规带肋钢筋和螺纹螺栓)、在粘结长度的自由端焊接螺母或圆环,以及沿粘结长度焊接直丝或螺旋丝。记录并评估了测试试样的极限粘接强度、滑移、粘接应力-滑移响应、破坏模式、刚度和延展性。结果表明,与浸没在基材中的带肋杆相比,用环氧树脂粘结的带肋杆的极限粘结强度和相应的滑移分别高出 11.11% 和 199%。与对照组相比,所有环氧树脂 NSM 罗纹杆都表现出更高的延展性。随着粘结长度的增加,NSM 棒的极限粘结强度下降了 12-32%。随着粘合长度的增加,刚度也随之降低。另一方面,NSM 环氧杆的延展性随着粘结长度的增加而增加。与对照组相比,所有应用方案(如螺母、环、纵向杆和螺旋杆)都显著提高了 NSM 螺纹杆的极限粘接强度(最大值 = 25.93%)和相应的滑移(最大值 = 166.67%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Improving Bond Performance of Near-Surface Mounted Steel Ribbed and Threated Rods in the Concrete

Improving Bond Performance of Near-Surface Mounted Steel Ribbed and Threated Rods in the Concrete

In this study, the experimental findings of twenty pull-out tests on the bond efficiency of threaded/ribbed steel rods used in near-surface mounting (NSM) are presented. On a groove (20 × 20 mm) that was slotted in one of the sides of a concrete block measuring 250 × 250 × 200 mm, a pull-out experiment was performed. The primary factors are the slot-filling materials (substrate concrete and epoxy paste), bonded length (equal to 5, 7, 10, and 15 times the rod diameter), surface pattern conditions (conventional ribbed reinforcing rebar and threaded bolt), use of nuts or rings welded at the free end of the bonded length, and use of straight or spiral wire welded along the length of the bonded length. The tested specimens' ultimate bond strength, slip, bond stress–slip response, failure patterns, stiffness, and ductility are recorded and assessed. The results showed that the ultimate bond strength and corresponding slip of ribbed rods cemented with epoxy were higher by 11.11% and 199%, respectively, than those of ribbed rods submerged in the substrate. Over the controls, all NSM epoxy-rods exhibited a greater ductility. As the bonded length increased, the ultimate bond strength of NSM rods fell by 12–32%. As the bonded length increased, the stiffness decreased. On the other hand, the ductility of NSM epoxy-rods increased as the bonded length increased. All applied schemes such as nuts, rings, longitudinal bars, and spiral bars significantly improved the ultimate bond strength (maximum = 25.93%) and corresponding slip (maximum = 166.67%) of NSM threaded rods as compared to the control ones.

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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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