Experimental study and mechanism analysis on static and dynamic mechanical properties of BFLAC at low temperatures

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-09-24 DOI:10.1016/j.coldregions.2024.104333

Wenxuan Yu , Zhihao Luo , Meiyu Fan , Liu Jin , Xiuli Du

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引用次数: 0

Abstract

This paper conducted comprehensive axial compressive and splitting-tensile tests to investigate the static and dynamic mechanical properties of basalt fibre reinforced lightweight-aggregate concrete (BFLAC) with fibre volume fractions

V_{f}

of 0.0∼0.3% at the temperatures ranging from 20 °C to −90 °C, with a special focus on the microscopic mechanism analysis and quantitative discussion of low-temperature enhancement effect, strain rate effect and fibre reinforcement effect. Test results show that the splitting-tensile strength, compressive strength, and elastic modulus of lightweight-aggregate concrete (LAC) perform an apparent low-temperature enhancement effect and this enhancement effect can be strengthened by the addition of basalt fibres. More basalt fibres reach the tensile failure strength and undergo rupture failure (Mode-2), resulting in the strain rate effect of BFLAC is slightly more significant than that of LAC; but the influence of low temperature on strain rate effect is mild. The incorporation of 0.3%

V_{f}

basalt fibres in LAC can bring at least a 20% increase in nominal strengths, showing an significant fibre reinforcement effect which can be enhanced (with maximum increase of 45.6%) as the temperature drops. Based on test results, the relationships between compressive and splitting-tensile strengths were discussed, and the empirical prediction formulas for predicting the static and dynamic mechanical properties of BFLAC at low temperatures were proposed. Research results of this paper can provide reference for mechanical performance calculation and engineering applications of BFLAC in the low-temperature environment.

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低温下 BFLAC 静态和动态力学性能的实验研究与机理分析

本文对纤维体积分数 Vf 为 0.0 ∼ 0.3% 的玄武岩纤维增强轻集料混凝土（BFLAC）在 20 °C 至 -90 °C 温度范围内的静态和动态力学性能进行了全面的轴向抗压和劈裂拉伸试验研究，重点对低温增强效应、应变速率效应和纤维增强效应进行了微观机理分析和定量讨论。试验结果表明，轻质骨料混凝土（LAC）的劈裂拉伸强度、抗压强度和弹性模量具有明显的低温增强效应，而且这种增强效应可以通过添加玄武岩纤维得到加强。更多的玄武岩纤维达到拉伸破坏强度并发生断裂破坏（模式-2），导致 BFLAC 的应变率效应比 LAC 稍为显著；但低温对应变率效应的影响较小。在 LAC 中加入 0.3%Vf 的玄武岩纤维可使标称强度提高至少 20%，这表明纤维增强效果显著，而且随着温度的降低，纤维增强效果会增强（最大增幅为 45.6%）。根据试验结果，讨论了压缩强度和劈裂拉伸强度之间的关系，并提出了预测 BFLAC 在低温下的静态和动态力学性能的经验预测公式。本文的研究成果可为 BFLAC 在低温环境下的力学性能计算和工程应用提供参考。

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

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.