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超高性能混凝土圆环约束收缩试验研究

李聪 陈宝春 黄卿维

李聪, 陈宝春, 黄卿维. 超高性能混凝土圆环约束收缩试验研究[J]. 工程力学, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552
引用本文: 李聪, 陈宝春, 黄卿维. 超高性能混凝土圆环约束收缩试验研究[J]. 工程力学, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552
LI Cong, CHEN Bao-chun, HUANG Qing-wei. EXPERIMENTAL RESEARCH ON SHRINKAGE OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER RESTRAINED RINGS[J]. Engineering Mechanics, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552
Citation: LI Cong, CHEN Bao-chun, HUANG Qing-wei. EXPERIMENTAL RESEARCH ON SHRINKAGE OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER RESTRAINED RINGS[J]. Engineering Mechanics, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552

超高性能混凝土圆环约束收缩试验研究

doi: 10.6052/j.issn.1000-4750.2018.10.0552
基金项目: 国家重点研发计划项目(2018YFC0705400);国家自然科学基金面上项目(51578156)
详细信息
    作者简介:

    李聪(1990-),男,河南汝南人,博士生,主要从事钢与超高性能混凝土组合结构研究(E-mail:conglic@foxmail.com);黄卿维(1982-),男,福建惠安人,副研究员,博士,主要从事超高性能混凝土与组合结构研究(E-mail:huangqingwei@fzu.edu.cn).

    通讯作者: 陈宝春(1958-),男,福建罗源人,教授,博士,博导,主要从事桥梁与结构工程研究(E-mail:baochunchen@fzu.edu.cn).
  • 中图分类号: TU528.572

EXPERIMENTAL RESEARCH ON SHRINKAGE OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER RESTRAINED RINGS

  • 摘要: 以约束水平、环境条件(密闭或干燥)和钢纤维等为参数,开展了超高性能混凝土(UHPC)圆环约束收缩试验。研究了钢环应变随龄期的发展规律;分析了各参数对圆环约束下的残余应力与各关键龄期的力学性能的影响;采用了拉应力水平和应力松弛率来评价UHPC的开裂性能。为配合圆环收缩试验,开展了自由收缩与基本力学性能试验。试验表明,未掺钢纤维的UHPC早期开裂风险大,在14 d前均发生开裂,裂缝平均宽度大于0.25 mm,含钢纤维试件均未开裂。不同约束程度对拉应力水平与应力松弛率的影响均显著,降低约束程度能有效降低开裂风险。与自由收缩测试结果不同,圆环约束UHPC在密闭条件下后期的开裂风险会高于环向干燥条件。建议以密闭条件下14 d的抗裂性能作为控制指标评价圆环约束下UHPC的开裂性能。
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    [31] Hannawi K, Bian H, Prince-Agbodjan W, et al. Effect of different types of fibers on the microstructure and the mechanical behavior of ultra-high performance fiber-reinforced concretes[J]. Composites Part B:Engineering, 2016, 86:214-220.
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出版历程
  • 收稿日期:  2018-10-18
  • 修回日期:  2018-12-24
  • 刊出日期:  2019-08-25

超高性能混凝土圆环约束收缩试验研究

doi: 10.6052/j.issn.1000-4750.2018.10.0552
    基金项目:  国家重点研发计划项目(2018YFC0705400);国家自然科学基金面上项目(51578156)
    作者简介:

    李聪(1990-),男,河南汝南人,博士生,主要从事钢与超高性能混凝土组合结构研究(E-mail:conglic@foxmail.com);黄卿维(1982-),男,福建惠安人,副研究员,博士,主要从事超高性能混凝土与组合结构研究(E-mail:huangqingwei@fzu.edu.cn).

    通讯作者: 陈宝春(1958-),男,福建罗源人,教授,博士,博导,主要从事桥梁与结构工程研究(E-mail:baochunchen@fzu.edu.cn).
  • 中图分类号: TU528.572

摘要: 以约束水平、环境条件(密闭或干燥)和钢纤维等为参数,开展了超高性能混凝土(UHPC)圆环约束收缩试验。研究了钢环应变随龄期的发展规律;分析了各参数对圆环约束下的残余应力与各关键龄期的力学性能的影响;采用了拉应力水平和应力松弛率来评价UHPC的开裂性能。为配合圆环收缩试验,开展了自由收缩与基本力学性能试验。试验表明,未掺钢纤维的UHPC早期开裂风险大,在14 d前均发生开裂,裂缝平均宽度大于0.25 mm,含钢纤维试件均未开裂。不同约束程度对拉应力水平与应力松弛率的影响均显著,降低约束程度能有效降低开裂风险。与自由收缩测试结果不同,圆环约束UHPC在密闭条件下后期的开裂风险会高于环向干燥条件。建议以密闭条件下14 d的抗裂性能作为控制指标评价圆环约束下UHPC的开裂性能。

English Abstract

李聪, 陈宝春, 黄卿维. 超高性能混凝土圆环约束收缩试验研究[J]. 工程力学, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552
引用本文: 李聪, 陈宝春, 黄卿维. 超高性能混凝土圆环约束收缩试验研究[J]. 工程力学, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552
LI Cong, CHEN Bao-chun, HUANG Qing-wei. EXPERIMENTAL RESEARCH ON SHRINKAGE OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER RESTRAINED RINGS[J]. Engineering Mechanics, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552
Citation: LI Cong, CHEN Bao-chun, HUANG Qing-wei. EXPERIMENTAL RESEARCH ON SHRINKAGE OF ULTRA-HIGH PERFORMANCE CONCRETE UNDER RESTRAINED RINGS[J]. Engineering Mechanics, 2019, 36(8): 49-58. doi: 10.6052/j.issn.1000-4750.2018.10.0552
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