Tensile characteristics of ultra-high performance fiber reinforced concrete with and without longitudinal steel rebars

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-01-23 DOI:10.1680/jmacr.23.00181

Chandrashekhar Lakavath, S. S. Prakash, Srinivas Allena

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Abstract

This study presents an experimental evaluation of ultra-high-performance fiber-reinforced concrete specimens with and without longitudinal reinforcement under direct tensile loading. The study variables are (i) volume fraction of fibers (1.0% and 2.0%), (ii) type of steel fibers (straight and hooked end), and (iii) longitudinal steel reinforcement ratio of 0.0% and 1.2%. All the specimens are tested using a servo-controlled fatigue testing machine in a displacement control mode. The changes in displacement were monitored using a linear variable displacement transducer and a digital image correlation technique. The strain profile at different loading stages is presented to identify the crack evolution process. Test results show that the average localized strain ranges from 0.2% to 0.36%, with corresponding crack widths of 0.3 mm to 0.6 mm. A uniaxial tensile stress-strain model is proposed based on the test results and literature database. The longitudinal steel reinforced specimens show both stiffening and strengthening effects. Tension-stiffened specimens with 1.0% fibers failed at a higher strain due to the formation of multiple macro cracks. In the specimens with 2.0% fibers, the rebar fractured in a brittle manner due to crack localization. A higher longitudinal reinforcement ratio is needed to effectively utilize UHPFRC under tension-dominant loads.

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有纵向钢筋和无纵向钢筋的超高性能纤维增强混凝土的拉伸特性

本研究介绍了在直接拉伸荷载作用下，有纵向钢筋和无纵向钢筋的超高性能纤维增强混凝土试样的实验评估。研究变量包括：(i) 纤维体积分数（1.0% 和 2.0%）；(ii) 钢纤维类型（直端和钩端）；(iii) 0.0% 和 1.2% 的纵向钢筋比例。所有试样均使用伺服控制疲劳试验机以位移控制模式进行测试。使用线性可变位移传感器和数字图像相关技术监测位移变化。不同加载阶段的应变曲线被呈现出来，以确定裂纹的演变过程。测试结果表明，平均局部应变范围为 0.2% 至 0.36%，相应的裂纹宽度为 0.3 毫米至 0.6 毫米。根据试验结果和文献数据库，提出了单轴拉伸应力-应变模型。纵向钢筋试样同时显示出加固和增强效应。纤维含量为 1.0% 的拉伸加固试样由于形成了多条宏观裂缝而在较高应变下失效。在纤维含量为 2.0% 的试样中，由于裂缝局部化，钢筋以脆性方式断裂。在拉力主导荷载条件下，需要更高的纵向配筋率才能有效利用超高压纤维水泥混凝土。

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

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.