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Effect of high temperature on morphologies of fibers and mechanical properties of multi-scale fiber reinforced cement-based composites

机译：高温对多尺度纤维加固水泥复合材料的纤维形态的影响

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摘要

By experimental research on the steel- polyvinyl alcohol (PVA) fibers- calcium carbonate whisker (CW) multi scale fiber-reinforced cement-based composites (MSFRC) after exposure of temperatures up to 900 degrees C, the flexural, compressive strength, and microstructures of multi scale fibers were investigated in this paper. The incorporation of steel-PVA fibers-CW can effectively improve the flexural and compressive strength of mortar after elevated temperatures. Compared with normal concrete, hybrid fiber reactive powder concrete (RPC) and engineered cement-based composites (ECC), the MSFRC present better capacity of high temperature resistance. The flexural and compressive strength increase first and then decrease with the increasing temperature, and the critical temperatures are 200 degrees C and 400 degrees C respectively. Models for describing the relationship between strength, CW content and temperature are proposed. The good high temperature resistance of MSFRC relates to the hybrid effect of melt of PVA fiber, good heat conduction of steel, and the phase transformation from aragonite to calcite of CW. Comprehensive morphology observations by digital camera and optical microscope are simple and useful way to evaluate the changes of fibers and CW at high temperature. This research is very beneficial for the applications of MSFRC in construction project with fire risk. (C) 2020 Elsevier Ltd. All rights reserved.
机译：通过对钢聚乙烯醇（PVA）纤维的实验研究 - 碳酸钙晶须（CW）多尺度纤维增强水泥基复合材料（MSFRC）在暴露于900摄氏度的温度下，弯曲，抗压强度和微观结构在本文中研究了多尺度纤维。钢-PVA纤维-CW的掺入可以有效地提高砂浆在升高的温度后的弯曲和抗压强度。与正常混凝土，混合纤维反应性粉体混凝土（RPC）和工程化水泥基复合材料（ECC）相比，MSFRC呈现出更好的高耐温性容量。弯曲和抗压强度首先增加，然后随着温度的增加而降低，临界温度分别为200℃和400℃。提出了描述强度，CW含量和温度之间关系的模型。 MSFRC的良好高耐温性涉及PVA纤维熔体，钢的良好热传导的杂交效应，以及来自助力方解石的纤维素的相变。通过数码相机和光学显微镜的综合形态学观察是简单且有用的方式来评估高温下的纤维和CW的变化。该研究对MSFRC在施工项目中的应用方面非常有利于火灾风险。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2020年第20期|120487.1-120487.11|共11页
  • 作者

    Li Li; Gao Danying; Li Zongli; Cao Mingli; Gao Jiping; Zhang Zhe;

  • 作者单位

    Northwest A&F Univ Coll Water Resources & Architectural Engn Yangling 712100 Shaanxi Peoples R China|Northwest A&F Univ Key Lab Agr Soil & Water Engn Arid & Semiarid Are Minist Educ Yangling 712100 Shaanxi Peoples R China|Dalian Univ Technol Fac Infrastruct Engn Dalian 116024 Peoples R China;

    Zhengzhou Univ Sch Civil Engn Zhengzhou 450002 Peoples R China;

    Northwest A&F Univ Coll Water Resources & Architectural Engn Yangling 712100 Shaanxi Peoples R China|Northwest A&F Univ Key Lab Agr Soil & Water Engn Arid & Semiarid Are Minist Educ Yangling 712100 Shaanxi Peoples R China;

    Dalian Univ Technol Fac Infrastruct Engn Dalian 116024 Peoples R China;

    Henan Prov YLX Expressway Construct Co Ltd Luoyang 471000 Peoples R China;

    Zhengzhou Univ Sch Civil Engn Zhengzhou 450002 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

    Polyvinyl alcohol fiber; Steel fiber; Calcium carbonate whisker; Cement-based composites; High temperature; Flexural strength; Compressive strength; Morphologies;

    机译：聚乙烯醇纤维;钢纤维;碳酸钙晶须;基于水泥基复合材料;高温;弯曲强度;抗压强度;形态;形态;

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