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作者:

Yu, Wenxuan (Yu, Wenxuan.) | Luo, Zhihao (Luo, Zhihao.) | Fan, Meiyu (Fan, Meiyu.) | Jin, Liu (Jin, Liu.) (学者:金浏) | Du, Xiuli (Du, Xiuli.)

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摘要:

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 Vf of 0.0 similar to 0.3% at the temperatures ranging from 20 degrees C to -90 degrees 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%Vf 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.

关键词:

Basalt fibre reinforced lightweight aggregate concrete Strain rate effect Fibre reinforcement effect Low temperature Fibre volume fraction

作者机构:

  • [ 1 ] [Yu, Wenxuan]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 2 ] [Luo, Zhihao]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 3 ] [Fan, Meiyu]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 4 ] [Jin, Liu]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 5 ] [Du, Xiuli]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 6 ] [Yu, Wenxuan]Tsinghua Univ, Dept Hydraul Engn, Beijing 100084, Peoples R China

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来源 :

COLD REGIONS SCIENCE AND TECHNOLOGY

ISSN: 0165-232X

年份: 2024

卷: 228

4 . 1 0 0

JCR@2022

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