SPALLING AND STRESS-STRAIN BEHAVIOUR OF POLYPROPYLENE FIBRE REINFORCED HPC AFTER EXPOSURE TO HIGH TEMPERATURES

机译：高温暴露后聚丙烯纤维增强的HPC的剥落和应力应变行为

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It is well known that physical and mechanical properties of high performance concrete (HPC) are affected by thermal exposure. Its dense microstructure can provide durability and high strength but may lead to a brittle behaviour when submitted to high temperatures. This work describes the stress-strain behaviour of polypropylene fibre reinforced high performance concrete exposed to ambient temperature (27℃) and to temperatures of 400, 650 and 900℃. The compressive strength and elastic modulus were determined after allowing the samples to cool down to room temperature. A change in the water porosity of the concrete with heating was measured by water absorption tests. The role of polypropylene fibre to control the spalling of HPC was also investigated. The results indicated that the spalling observed in the matrices is significantly reduced with the fibre addition.

机译：众所周知，高性能混凝土（HPC）的物理和机械性能会受到热暴露的影响。其致密的微观结构可提供耐用性和高强度，但在高温下会导致脆性。这项工作描述了聚丙烯纤维增强高性能混凝土在环境温度（27℃）以及400、650和900℃的温度下的应力应变行为。在使样品冷却至室温之后，测定抗压强度和弹性模量。通过吸水试验来测量加热时混凝土的水孔隙率的变化。还研究了聚丙烯纤维在控制HPC剥落中的作用。结果表明，随着纤维的添加，在基质中观察到的剥落显着减少。

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《RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.1; 20040920-22; Varenna(IT)》|2004年|P.699-708|共10页
会议地点 Varenna(IT)
作者
R.V. Velasco; R.D. Toledo Filho; E.M.R. Fairbairn; P.R.L. Lima; R. Neumann;
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Department of Civil Engineering, COPPE, Universidade Federal do Rio de Janeiro, Brazil;

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原文格式 PDF
正文语种 eng
中图分类钢筋混凝土结构;
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专利

1. High-temperature behaviour of HPC with polypropylene fibres From spalling to microstructure [J] . Pierre Kalifa, Gregoire Chene, Christophe Ga1le Cement and Concrete Research . 2001,第10期

机译：聚丙烯纤维对HPC的高温行为从剥落到微观结构
2. Spalling behavior and residual resistance of fibre reinforced Ultra-High performance concrete after exposure to high temperatures [J] . Ming-Xiang Xiong, J. Y. Richard Liew Materiales de Construccion . 2015,第320期

机译：纤维增强超高性能混凝土在高温下的剥落性能和残余电阻
3. Influence of steel and/or polypropylene fibres on the behaviour of concrete at high temperature: Spalling, transfer and mechanical properties [J] . Yermak N., Pliya P., Beaucour A. -L., Construction and Building Materials . 2017,第FEBa1期

机译：钢和/或聚丙烯纤维对高温下混凝土性能的影响：剥落，转移和机械性能
4. SPALLING AND STRESS-STRAIN BEHAVIOUR OF POLYPROPYLENE FIBRE REINFORCED HPC AFTER EXPOSURE TO HIGH TEMPERATURES [C] . R.V. Velasco, R.D. Toledo Filho, E.M.R. Fairbairn, RILEM Symposium on Fibre-Reinforced Concretes . 2004

机译：聚丙烯纤维增强HPC暴露于高温后的剥落和应力 - 应变行为
5. Flexural behaviour of fibre reinforced polymer strengthened reinforced concrete beams at elevated temperatures. [D] . Shier, Greg. 2013

机译：纤维增强聚合物增强的钢筋混凝土梁在高温下的抗弯性能。
6. Effect of Chemical Treatments on Flax Fibre Reinforced Polypropylene Composites on Tensile and Dome Forming Behaviour [O] . Wentian Wang, Adrian Lowe, Shankar Kalyanasundaram 2015

机译：化学处理对亚麻纤维增强聚丙烯复合材料的拉伸和圆顶形成行为的影响
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。

SPALLING AND STRESS-STRAIN BEHAVIOUR OF POLYPROPYLENE FIBRE REINFORCED HPC AFTER EXPOSURE TO HIGH TEMPERATURES

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