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

机译：基于NMR的多尺度PFRC的冻胀机制

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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：为了探讨多尺寸聚丙烯 - 纤维增强混凝土（PFRC）的冻胀机理，基于快速冻融循环试验。进行核磁共振检测和扫描电子显微镜以研究PFRC的微孔结构。结果表明，多尺度PFRC具有优异的冰霜抗性。与普通混凝土相比，与粗细胞和细纤维混合的混凝土孔隙率的改善0.242-0.427％，半径孔的孔隙率小于100nm的孔隙率为75.68-84.00％。当总PP纤维含量保持恒定时，细纤维的量较大，纤维直径较小，混凝土微孔结构的改善和剥落抗性更明显。对于所研究的多级PFRC，发现三种纤维形成了更好的整体网络系统，因为纤维彼此支撑并互补。微孔结构和混凝土的冰霜抗性显着提高，而标本的开裂性和韧性是足够的。

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  • 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;纤维增强混凝土;韧性;

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