Effect of Various Moisture Contents, Variety and Dosage of Fibers on Explosive Spalling and Residual Compressive Strength of High Performance Concrete Subjected to High Temperatures

Song-Hua Bian; Gai-Fei Peng; Zhang-Li Zhao; Quan-Xin YI

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Effect of Various Moisture Contents, Variety and Dosage of Fibers on Explosive Spalling and Residual Compressive Strength of High Performance Concrete Subjected to High Temperatures

机译：纤维的各种水分含量，种类和用量对高温下高性能混凝土的爆炸剥落和残余抗压强度的影响

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This paper presents an experimental investigation on the effect of moisture content and hybrid fiber (polypropylene fiber plus steel fiber) on both explosive spalling and residual compressive strength of high performance concrete after exposure to high temperatures. The experimental results indicate that, concrete at 0.26 water/binder ratio may encounter explosive spalling under temperature from 320℃ to 440℃, and the higher moisture content, the greater the frequency of explosive spalling occurrence and damage degree. Explosive spalling can be prevented by incorporating polypropylene (PP) fiber at a dosage as low as 0.1 volume percent. The addition of hybrid fiber (polypropylene fiber plus steel fiber), not only avoids occurrence of explosive spalling, but also enhances residual compressive strength of specimens. Among a series of ratios of polypropylene fiber quantity to steel fiber quantity in volume, a specific ratio was identified to be the optimum for the effect of hybrid fiber on high temperature behavior of concrete.

机译：本文对含水量和混合纤维（聚丙烯纤维加钢纤维）对高性能混凝土爆炸后剥落和残余抗压强度的影响进行了实验研究。试验结果表明，水灰比为0.26的混凝土在320℃至440℃的温度下可能会发生爆炸剥落，含水量越高，爆炸剥落的发生频率和破坏程度就越大。通过掺入低至0.1体积％的聚丙烯（PP）纤维可以防止爆炸性剥落。混合纤维（聚丙烯纤维加钢纤维）的加入，不仅避免了爆炸剥落的发生，而且还提高了样品的残余抗压强度。在一系列聚丙烯纤维数量与钢纤维数量的比率中，确定一个特定比率是最合适的，以确保混合纤维对混凝土高温性能的影响。

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来源
《Key Engineering Materials》 |2006年第2006期|p.618-623|共6页
作者
Song-Hua Bian; Gai-Fei Peng; Zhang-Li Zhao; Quan-Xin YI;
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作者单位

Faculty of Civil Engineering and Architecture, Beijing JiaoTong University, Beijing 100044, China;

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原文格式 PDF
正文语种 eng
中图分类工程基础科学;
关键词
moisture content; hybrid fiber; high temperature; explosive spalling; residual compressive strength; high performance concrete;

机译：水分;混合纤维;高温;爆炸剥落;残余抗压强度;高性能混凝土;

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专利

1. Explosive spalling and residual mechanical properties of fiber-toughened high-performance concrete subjected to high temperatures [J] . G.-F. Peng, W.-W. Yang, J. Zhao Cement and Concrete Research . 2006,第4期

机译：高温下纤维增韧高性能混凝土的爆炸剥落和残余力学性能
2. Residual Mechanical Properties and Explosive Spalling Behavior of Ultra-High-Strength Concrete Exposed to High Temperature [J] . Gaifei Peng, Juan Yang 哈尔滨工业大学学报（英文版） . 2017,第004期

机译：高温下超高强度混凝土的残余力学性能和爆炸剥落行为
3. Synergistic effects of hybrid polypropylene and steel fibers on explosive spalling prevention of ultra-high performance concrete at elevated temperature [J] . Li Ye, Tan Kang Hai, Yang En-Hua Cement & concrete composites . 2019,第期

机译：杂交聚丙烯和钢纤维在升高温度下超高性能混凝土爆炸剥落预防杂交聚丙烯和钢纤维的协同作用
4. Effect of Various Moisture Contents, Variety and Dosage of Fibers on Explosive Spalling and Residual Compressive Strength of High Performance Concrete Subjected to High Temperatures [C] . Song-Hua Bian, Gai-Fei Peng, Zhang-Li Zhao, International Symposium on Environmental Ecology and Technology of Concrete . 2005

机译：各种水分含量，纤维品种和剂量对高温混凝土爆炸剥落和剩余抗压强度的影响
5. Characterizing Temperature Induced Strength Degradation and Explosive Spalling in Ultra High Performance Concrete. [D] . Sarwar, Mahmood A. 2017

机译：表征超高性能混凝土中温度引起的强度降低和爆炸剥落。
6. Spalling Resistance of Fiber-Reinforced Ultra-High-Strength Concrete Subjected to the ISO-834 Standard Fire Curve: Effects of Thermal Strain and Water Vapor Pressure [O] . Taegyu Lee, Gyuyong Kim, Gyeongcheol Choe, 2020

机译：纤维增强超高强度混凝土的剥落电阻对ISO-834标准火灾曲线进行：热应变和水蒸气压力的影响
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. High-Strength Self-Consolidating Concrete Girders Subjected to Elevated Compressive Fiber Stresses [R] . Myers, J. J., Myers, J. J., Brewe, J. E. 2009

机译：高强度自密实混凝土梁承受高强压缩纤维应力

Effect of Various Moisture Contents, Variety and Dosage of Fibers on Explosive Spalling and Residual Compressive Strength of High Performance Concrete Subjected to High Temperatures

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