Compression behaviour of self-compacting concrete under high strain rate loadings at different ages

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

Magazine of Concrete Research Pub Date : 2024-05-15 DOI:10.1680/jmacr.24.00012

S. Ranjithkumar, M. Muthuraja, S. N. Khaderi, S. Suriya Prakash

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Abstract

Self-compacting concrete (SCC) is widely used in reinforced concrete (RC) buildings due to its ability to consolidate by weight and its lack of requirement for external vibration. RC buildings can be subjected to high strain rate loadings during the early days of construction or in their service life. Thus, it is critical to understand the behaviour of concrete under high strain rate loadings at different ages. Previous research shows that minimal studies have focused on the early-age behaviour of concrete under a high strain rate. This study tries to fill this knowledge gap. It focuses on the behaviour of M40 grade SCC under three levels of strain rate loading at the age of one, three, seven, 14 and 28 days. The Split-Hopkinson Pressure Bar (SHPB) setup is used to test the SCC specimens with a diameter of 100 mm and thickness of 50 mm under high strain rates. Forty-five specimens were tested at strain rates ranging from 30 s−1 to 110 s−1 at the age of one to 28 days. The compressive strength, peak strain and elastic modulus results from the SHPB experiment are compared with the quasi-static test results of SCC specimens. The dynamic increase factor (DIF) of the SCC specimens from the SHPB experiment is compared with the CEB – fib code model. The results indicate that the DIF reduces as the concrete's strength and age increase.

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自密实混凝土在不同龄期高应变率荷载下的压缩行为

自密实混凝土（SCC）因其重量固结能力强且无需外部振动，被广泛应用于钢筋混凝土（RC）建筑中。RC 建筑在建造初期或使用年限内可能会承受高应变率荷载。因此，了解不同龄期混凝土在高应变率荷载下的行为至关重要。以往的研究表明，对混凝土在高应变率作用下早期龄期行为的研究很少。本研究试图填补这一知识空白。它重点研究了 M40 级 SCC 在 1 天、3 天、7 天、14 天和 28 天等三个龄期的应变率加载下的行为。在高应变速率下，使用分体式霍普金森压力棒（SHPB）装置测试直径为 100 毫米、厚度为 50 毫米的 SCC 试样。在 1 到 28 天的龄期内，以 30 s-1 到 110 s-1 不等的应变率对 45 个试样进行了测试。将 SHPB 实验得出的抗压强度、峰值应变和弹性模量结果与 SCC 试样的准静态测试结果进行了比较。还将 SHPB 实验得出的 SCC 试件动态增大系数 (DIF) 与 CEB - fib 法规模型进行了比较。结果表明，DIF 会随着混凝土强度和龄期的增加而降低。

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.