Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres
Experimental study on engineering properties of concrete reinforced with hybrid recycled tyre steel and polypropylene fibres
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DOI：
10.1016/j.jclepro.2020.120914
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发表时间：
2020-06
影响因子：
11.1
通讯作者：
Hui Zhong;Mingzhong Zhang
中科院分区：
文献类型：
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作者：
Hui Zhong;Mingzhong Zhang
再生轮胎钢纤维（RTSF）被认为是一种潜在的、可持续的人造钢纤维（MSF）替代品，但与MSF相比，RTSF的能量吸收能力较低，混凝土的腐蚀问题更严重。本文介绍了掺0.5%~ 0.9%Vf的RTSF和掺0.1%~ 0.5%Vf的聚丙烯纤维（PPF）混凝土工程性能的试验研究。结果表明，RTSF与PPF复合处理可以弥补RTSF对混凝土工作性的严重损失，工作性提高38.9%~ 66.7%。当PPF掺量超过0.3%Vfin（总掺量为1.0%Vf）时，复合材料的抗压强度、劈拉强度和弯曲强度均显著降低。数字图像相关图像中所示的应变场表明，混合RTSF和PPF可以产生协同效应，在抑制裂缝的扩展和混凝土的开裂后的行为，特别是韧性，增强与PPF的存在。RTSF比PPF更能有效地抑制混凝土的收缩。随着混杂纤维中PPF掺量的增加，混凝土的氯离子迁移系数比单掺RTSF的混凝土降低了4.9%~ 6.8%。
Recycled tyre steel fibre (RTSF) is considered as a potential and sustainable alternative to manufactured steel fibre (MSF), while RTSF resulted in lower energy absorption capacity and more serious corrosion problem in concrete compared to MSF. This paper presents an experimental study on engineering properties of concrete reinforced with hybrid RTSF (0.5%–0.9% Vf) and polypropylene fibre (PPF, 0.1%–0.5% Vf). Results show that combining RTSF with PPF could compensate the serious workability loss caused by RTSF and the workability was improved by 38.9%–66.7%. However, the compressive, splitting tensile and flexural strengths were weakened significantly when PPF was over 0.3% Vfin hybrid fibre reinforcement (total content of 1.0% Vf). The strain field shown in digital image correlation images suggests that hybrid RTSF and PPF can create a synergistic effect in restraining the crack growth and the post-cracking behaviour of concrete especially toughness that was enhanced with the presence of PPF. RTSF was more effective in restraining shrinkage of concrete than PPF. With the increase of PPF content in hybrid fibre reinforcement, the chloride migration coefficient of concrete was reduced by 4.9%–6.8% as compared with the mixture reinforced with only RTSF.