Effect of lateral restraint and inclusion of polypropylene and steel fibers on spalling behavior, pore pressure, and thermal stress in ultra-high-performance concrete (UHPC) at elevated temperature

Li Ye; Zhang Dong

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Effect of lateral restraint and inclusion of polypropylene and steel fibers on spalling behavior, pore pressure, and thermal stress in ultra-high-performance concrete (UHPC) at elevated temperature

机译：横向约束和钢纤维在升高温度下对超高性能混凝土（UHPC）中剥落行为，孔隙压力和热应力的影响

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This paper investigates effects of lateral restraint and inclusion of polypropylene (PP) and steel fibers on pore pressure, thermal stress, and explosive spalling in ultra-high-performance concrete (UHPC) at high temperature. Temperature and pore pressure were measured simultaneously at different depths of six cylindrical UHPC specimens exposed to one-dimensional heating following ISO 834 heating curve. Numerical models were built to reveal thermal stress development and damage propagation of the UHPC specimens. The significance of pore pressures and thermally stresses for explosive spalling was discussed. The results found that addition of PP and steel fibers fully suppressed spalling. But the maximum pore pressures measured in the spalled specimens were well below the tensile strength of the concrete. The thermal gradient induces compressive stresses to the heated surface and tensile stress to the interior regions. The steel ring restraint increased the compressive stress as the lateral loading were superimposed upon the thermal stresses and thus induced more damage in the UHPC specimens. The thermally stress is considered to be the primary factor in initiating concrete cracking, while the pore pressures are the driving force for increasing kinetics of the spalled concrete pieces. (C) 2020 Elsevier Ltd. All rights reserved.

机译：本文研究了在高温下对超高性能混凝土（UHPC）的孔隙压力，热应力和爆炸性剥落的横向约束和包含聚丙烯（PP）和钢纤维的影响。在六个圆柱形UHPC样本的不同深度的不同深度下同时测量温度和孔隙压力，其暴露于ISO 834加热曲线之后的一维加热。建立了数值模型，以揭示uHPC标本的热应力开发和损伤传播。讨论了孔压力和热应力对爆炸性剥落的重要性。结果发现，添加PP和钢纤维完全抑制剥落。但是在芯片标本中测量的最大孔压力远低于混凝土的拉伸强度。热梯度将压缩应力引导到加热的表面和拉伸应力到内部区域。随着横向载荷叠加在热应力上，钢环约束增加了压缩应力，因此在UHPC标本中诱导了更多损伤。热应力被认为是启动混凝土裂缝中的主要因素，而孔压力是用于增加掺入混凝土件的动力学的驱动力。（c）2020 elestvier有限公司保留所有权利。

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来源
《Construction and Building Materials》 |2021年第15期|121879.1-121879.11|共11页
作者
Li Ye; Zhang Dong;
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作者单位

Harbin Inst Technol Sch Civil & Environm Engn Shenzhen 518055 Peoples R China;

Nanyang Technol Univ Sch Civil & Environm Engn Singapore 639798 Singapore;

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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
Explosive spalling; Ultra-high performance concrete; Lateral confinement; Polypropylene fiber, steel fiber;

机译：爆炸性剥落;超高性能混凝土;外侧限制;聚丙烯纤维;钢纤维;

Effect of lateral restraint and inclusion of polypropylene and steel fibers on spalling behavior, pore pressure, and thermal stress in ultra-high-performance concrete (UHPC) at elevated temperature

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