Effect of coarse recycled aggregate with embedded fibres on the mechanical properties and microstructure of polypropylene fibre-reinforced concrete

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-11-22 DOI:10.1617/s11527-024-02527-3

Guanzhi Liu, Josep Claramunt, Martin Hunger, Nikola Tošić, Albert de la Fuente

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引用次数: 0

Abstract

Previous studies have shown the feasibility of using recycled aggregates in new concrete production. However, the recycling of fibre-reinforced concrete (FRC) introduces a novel challenge: the emergence of a new aggregate type that can be identified as recycled aggregate with embedded fibres. Therefore, in this study, in order to investigate the differences, the mechanical properties and microstructures of polypropylene fibre-reinforced concrete (PPFRC) made of natural coarse aggregate, coarse recycled aggregate and coarse recycled aggregate with embedded fibres were compared. Polypropylene fibre contents of 3 and 9 kg/m³ (0.33% and 1.0% by volume, respectively) were chosen for all concretes. The mechanical properties, including stress–strain behaviour in compression and flexural behavior, were tested. Scanning electron microscopy (SEM) was used to examine the microstructure and elucidate the effects of different aggregates on PPFRC properties. The results indicated that recycled aggregate with embedded fibres did not enhance compressive strength and elastic modulus compared to recycled aggregate without fibres. However, when the fibre content is low, its contribution to flexural behavior is significant, even surpassing that of PPFRC made with natural aggregate.

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嵌入纤维的粗再生骨料对聚丙烯纤维增强混凝土力学性能和微观结构的影响

以往的研究表明，在新混凝土生产中使用再生骨料是可行的。然而，纤维增强混凝土（FRC）的回收利用带来了新的挑战：出现了一种新的骨料类型，可将其确定为带有嵌入纤维的回收骨料。因此，在本研究中，为了探究其中的差异，比较了天然粗骨料、粗再生骨料和带嵌入纤维的粗再生骨料制成的聚丙烯纤维增强混凝土（PPFRC）的力学性能和微观结构。所有混凝土的聚丙烯纤维含量分别为 3 千克/立方米和 9 千克/立方米（体积比分别为 0.33% 和 1.0%）。测试了混凝土的机械性能，包括压缩和弯曲时的应力应变行为。扫描电子显微镜（SEM）用于检查微观结构，并阐明不同骨料对 PPFRC 性能的影响。结果表明，与不含纤维的再生骨料相比，含有嵌入纤维的再生骨料不会提高抗压强度和弹性模量。然而，当纤维含量较低时，它对抗弯行为的贡献非常显著，甚至超过了用天然骨料制成的 PPFRC。

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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.