A Study of Energy Dissipation of Polypropylene Fiber Reinforced Recycled Concrete Under Uniaxial Compression

IF 1.5 4区 材料科学 Q4 MATERIALS SCIENCE, COMPOSITES
Daowen Zhou, Xin Yang, Yutao Miao, Tingtao Chen, Zhixiong Yao
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Abstract

The energy dissipation and stress-strain characteristics, and characteristic stresses, namely the crack initiation σci , dilatancy σcd , and peak σf stresses, of polypropylene fiber-reinforced recycled concrete under uniaxial compression were studied. According to the research results, the crack initiation and peak stresses of the specimen with single-blend polypropylene coarse fiber (No. 3) and the specimens with mixed-blend coarse and fine polypropylene fibers (No. 4 and No. 5) are higher than those of the specimen with single-blend fine fiber and plain concrete. The analysis of the energy characteristics and failure mechanism of polypropylene fiber-reinforced recycled concrete during loading based on the principle of energy conservation showed that the total strain energy, elastic strain energy, and dissipation energy absorbed per unit volume increase with the blending of polypropylene fiber. The strain energy and elastic strain energy of coarse aggregates with a 5-10 to 10-20 mm coarse aggregate size ratios of 5:5 are higher than those of 4:6 and 6:4. It was found that the continuous blending of polypropylene fiber increases the elastic strain energy, causing the point at which the dissipation energy exceeds the elastic strain energy move further and further back. The position where the dissipation energy exceeds the elastic strain energy can be used to evaluate the blending effect of polypropylene fiber. The further back the position, the better the blending effect.

Abstract Image

聚丙烯纤维增强再生混凝土在单轴压缩下的能量耗散研究
研究了聚丙烯纤维增强再生混凝土在单轴压缩条件下的能量耗散和应力应变特性,以及特征应力,即裂缝起始应力σci、扩张应力σcd和峰值应力σf。研究结果表明,单混聚丙烯粗纤维试件(3 号)和粗细聚丙烯纤维混混试件(4 号和 5 号)的裂缝起始点和峰值应力均高于单混细纤维试件和素混凝土。根据能量守恒原理对聚丙烯纤维增强再生混凝土在加载过程中的能量特性和破坏机理进行的分析表明,单位体积吸收的总应变能、弹性应变能和耗散能随着聚丙烯纤维掺量的增加而增加。粗集料粒径比为 5:5 的 5-10 至 10-20 毫米粗集料的应变能和弹性应变能高于 4:6 和 6:4。研究发现,聚丙烯纤维的连续掺入会增加弹性应变能,导致耗散能超过弹性应变能的位置越来越靠后。耗散能超过弹性应变能的位置可用来评估聚丙烯纤维的混纺效果。位置越靠后,混合效果越好。
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来源期刊
Mechanics of Composite Materials
Mechanics of Composite Materials 工程技术-材料科学:复合
CiteScore
2.90
自引率
17.60%
发文量
73
审稿时长
12 months
期刊介绍: Mechanics of Composite Materials is a peer-reviewed international journal that encourages publication of original experimental and theoretical research on the mechanical properties of composite materials and their constituents including, but not limited to: damage, failure, fatigue, and long-term strength; methods of optimum design of materials and structures; prediction of long-term properties and aging problems; nondestructive testing; mechanical aspects of technology; mechanics of nanocomposites; mechanics of biocomposites; composites in aerospace and wind-power engineering; composites in civil engineering and infrastructure and other composites applications.
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