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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,等.超高性能混凝土收缩综述[J].交通运输工程学报,2018,18(01):13-28.
引用本文: 陈宝春,李聪,黄伟,等.超高性能混凝土收缩综述[J].交通运输工程学报,2018,18(01):13-28.
CHEN Bao-chun,LI Cong,HUANG Wei,et al.Review of ultra-high performance concrete shrinkage[J].Journal of Traffic and Transportation Engineering,2018,18(01):13-28.
Citation: CHEN Bao-chun,LI Cong,HUANG Wei,et al.Review of ultra-high performance concrete shrinkage[J].Journal of Traffic and Transportation Engineering,2018,18(01):13-28.

超高性能混凝土收缩综述

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

  • 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。

     

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