• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Magazine of Concrete Research >Frost-resistance mechanism of multi-scale PFRC based on NMR
【24h】

Frost-resistance mechanism of multi-scale PFRC based on NMR

机译：基于核磁共振的多尺度PFRC抗冻机理

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In order to explore the frost-resistance mechanism of multi-scale polypropylene-fibre-reinforced concrete (PFRC), the mass loss rate and relative dynamic elastic modulus variation curves of concretes made with different sizes of polypropylene (PP) fibre were analysed based on the fast freeze-thaw cycle test. Nuclear magnetic resonance testing and scanning electron microscopy were carried out to study the micropore structure of the PFRCs. The results showed that the multi-scale PFRC had excellent frost resistance. Compared with plain concrete, the concretes mixed with coarse and fine PP fibres showed a 0.242-0.427% improvement in porosity, with 75.68-84.00% of pores of radius less than 100 nm. When the total PP fibre content was held constant, but the amount of fine fibre was larger and the fibre diameter was smaller, the improvements in concrete micropore structure and spalling resistance were more obvious. For the multi-scale PFRCs studied, it was found that three sizes of fibres formed a better holistic network system as the fibres supported and complemented each other. The micropore structure and frost resistance of the concrete were improved significantly, while the cracking resistance and toughness of the specimens were adequate.
机译：为了探索多尺度聚丙烯纤维混凝土（PFRC）的抗冻机理，在此基础上，分析了不同尺寸聚丙烯纤维（PP）制成的混凝土的质量损失率和相对动态弹性模量变化曲线。快速冻融循环测试。进行了核磁共振测试和扫描电子显微镜研究了PFRCs的微孔结构。结果表明，多级PFRC具有优良的抗冻性。与普通混凝土相比，混有粗细PP纤维的混凝土的孔隙率提高0.242-0.427％，半径小于100 nm的孔隙的比例为75.68-84.00％。当PP纤维的总含量保持恒定，但细纤维的数量较大且纤维直径较小时，混凝土微孔结构和抗剥落性的改善更为明显。对于所研究的多尺度PFRC，发现三种尺寸的光纤形成了更好的整体网络系统，因为它们相互支撑和互补。混凝土的微孔结构和抗冻性得到显着改善，而试样的抗裂性和韧性则足够。

著录项

  • 来源
    《Magazine of Concrete Research》 |2019年第14期|710-718|共9页
  • 作者

    Liang Ninghui; Miao Qingxu; Liu Xinrong; Zhong Yang;

  • 作者单位

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China|Chongqing Univ, Natl Joint Engn Res Ctr Prevent & Control Environ, Chongqing, Peoples R China;

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China|Chongqing Univ, Natl Joint Engn Res Ctr Prevent & Control Environ, Chongqing, Peoples R China;

    Chongqing Univ, Sch Civil Engn, Chongqing, Peoples R China|Chongqing Univ, Natl Joint Engn Res Ctr Prevent & Control Environ, Chongqing, Peoples R China;

    Beijing Urban Construct Design & Dev Grp Co Ltd, Beijing, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    durability-related properties; fibre-reinforced concrete; toughness;

    机译：耐久性相关性能;纤维混凝土;韧性;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号