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超高性能混凝土收缩综述

陈宝春 李聪 黄伟 安明喆 韩松 丁庆军

陈宝春, 李聪, 黄伟, 安明喆, 韩松, 丁庆军. 超高性能混凝土收缩综述[J]. 交通运输工程学报, 2018, 18(1): 13-28. doi: 10.19818/j.cnki.1671-1637.2018.01.002
引用本文: 陈宝春, 李聪, 黄伟, 安明喆, 韩松, 丁庆军. 超高性能混凝土收缩综述[J]. 交通运输工程学报, 2018, 18(1): 13-28. doi: 10.19818/j.cnki.1671-1637.2018.01.002
CHEN Bao-chun, LI Cong, HUANG Wei, AN Ming-zhe, HAN Song, DING Qing-jun. Review of ultra-high performance concrete shrinkage[J]. Journal of Traffic and Transportation Engineering, 2018, 18(1): 13-28. doi: 10.19818/j.cnki.1671-1637.2018.01.002
Citation: CHEN Bao-chun, LI Cong, HUANG Wei, AN Ming-zhe, HAN Song, DING Qing-jun. Review of ultra-high performance concrete shrinkage[J]. Journal of Traffic and Transportation Engineering, 2018, 18(1): 13-28. doi: 10.19818/j.cnki.1671-1637.2018.01.002

超高性能混凝土收缩综述

doi: 10.19818/j.cnki.1671-1637.2018.01.002
基金项目: 

国家自然科学基金项目 U1305245

详细信息
    作者简介:

    陈宝春(1958-), 男, 福建罗源人, 福州大学教授, 工学博士, 从事桥梁工程研究

  • 中图分类号: U416.2

Review of ultra-high performance concrete shrinkage

More Information
  • 摘要: 分析了超高性能混凝土(UHPC)的收缩特性及其随时间发展的一般规律, 总结了材料组成、养护制度与内部温湿度场对UHPC收缩的影响。研究结果表明: UHPC收缩早期(0~7 d)发展快, 占总收缩的61.3%~86.5%, 中期(7~28 d)发展缓慢, 占总收缩的13.5%~27.9%, 后期(28 d后)趋于稳定; UHPC以自收缩为主, 占总收缩的78.6%~90.0%, 是早期开裂的主要诱因; 收缩测试起始时间可取试件成型后1 d(24 h), 终止时间可取90 d或120 d; 在结构设计时, 可参考各国规范取收缩为500~800 με, 热养护后可不考虑残余收缩; 对于收缩预测模型, 各国规范尚未统一, 多借鉴现有的收缩模型, 应完善与修正收缩预测模型; 对于材料组成, 目前集中于纤维、矿物掺合料的种类和掺量对收缩的定量影响, 且各组分对收缩的影响不同, 评价指标较为单一, 应结合结构用途、制备工艺与施工过程等进行综合评价; 对于内部温度与湿度场, 研究对象主要集中于28 d后的普通混凝土与高强高性能混凝土, 应深入研究胶凝材料含量大、组分差异性明显、活性矿物掺合料掺量高的UHPC早期内部温度与湿度场; 为了降低收缩, 基本采用内养护, 添加膨胀剂、减缩剂与粗骨料等措施。可见: 为了减小UHPC收缩的同时又不降低其力学性能, 应该优化UHPC配比, 合理使用外加剂, 采取适当养护制度等措施。

     

  • 图  1  收缩统计

    Figure  1.  Shrinkages statistics

    图  2  收缩随龄期的发展曲线

    Figure  2.  Developing curves of shrinkage with age

    图  3  7d和90d的收缩

    Figure  3.  Shrinkages at 7dand 90d

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  • 收稿日期:  2017-09-14
  • 刊出日期:  2018-02-25

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