FIRE RESISTANCE OF HYBRID FIBER REINFORCED HIGH STRENGTH CONCRETE

机译：混杂纤维增强高强混凝土的耐火性

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High-strength concrete shows particular characteristic behavior at elevated temperatures, such as explosive spalling, that is rarely observed in normal-strength concrete. This behavior has been attributed to the very dense concrete matrix usually associated with high-strength concrete. Recently the addition of polypropylene fibers into high-strength concrete was reported to be very effective against the explosive spalling. As heating increases, the fibers in the cement matrix start to melt at about 170 ℃ and increase the total pore area. This melting effect mitigates the explosive spalling as it provides pore space in which moisture vapor can accumulate at lower vapor pressures. However, it is hopeless to maintain the fracture toughness when the fibers melt. Steel fiber reinforcement can help to maintain the fracture toughness after heated. In this paper, hybrid fiber reinforcement with the combination of polypropylene and steel fibers is proposed for improving the strength as well as the fracture characteristics after heating. Tests results of hybrid fiber reinforced concrete showed significant improvement on the residual strength and residual fracture energy after high temperature (200 and 400 ℃).

机译：高强度混凝土在高温下表现出特殊的特征行为，例如爆炸剥落，这在普通强度混凝土中很少观察到。这种行为归因于通常与高强度混凝土相关的非常致密的混凝土基体。最近，据报道在高强度混凝土中添加聚丙烯纤维对爆炸性剥落非常有效。随着热量的增加，水泥基质中的纤维在170℃左右开始熔化并增加了总孔面积。这种熔化效果减轻了爆炸性剥落，因为它提供了孔隙空间，在较低的蒸汽压力下，水蒸气可以在其中积聚。但是，当纤维熔化时，保持断裂韧性是没有希望的。钢纤维增强可以帮助保持加热后的断裂韧性。为了提高强度和加热后的断裂特性，提出了聚丙烯纤维和钢纤维混合的纤维增强材料。混杂纤维增强混凝土的试验结果表明，在高温（200和400℃）下，残余强度和残余断裂能都有显着改善。

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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.669-678|共10页
会议地点 Varenna(IT)
作者
T. Horiguchi; T. Sugawara; N. Saeki;
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Hokkaido University, Japan;

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正文语种 eng
中图分类钢筋混凝土结构;
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专利

1. HEAT-RESISTANT CORUNDUM CONCRETE REINFORCED WITH ALUMINUM OXIDE FIBERS SYNTHESIZED WITHIN A MATRIX DURING FIRING PART 2. THEORETICAL PREREQUISITES FOR IMPROVING REFRACTORY CONCRETE HEAT RESISTANCE REINFORCED WITH FINE FIBERS1 [J] . V. N. Sokov, V. V. Sokov Refractories and Industrial Ceramics . 2014,第3期

机译：耐火刚玉混凝土在烧结过程中在基体中合成，并用氧化铝纤维增强。第2部分。
2. High temperature properties of fiber reinforced polymers and fire insulation for fire resistance modeling of strengthened concrete structures [J] . Kodur V. K. R., Bhatt P. P., Naser M. Z. Composites . 2019,第OCTa15期

机译：纤维增强聚合物和防火隔热材料的高温特性，用于钢筋混凝土结构的耐火性建模
3. High temperature properties of fiber reinforced polymers and fire insulation for fire resistance modeling of strengthened concrete structures [J] . Kodur V. K. R., Bhatt P. P., Naser M. Z. Composites . 2019,第Octa15期

机译：纤维增强聚合物和防火隔热材料的高温特性，用于钢筋混凝土结构的耐火性建模
4. FIRE RESISTANCE OF HYBRID FIBER REINFORCED HIGH STRENGTH CONCRETE [C] . T. Horiguchi, T. Sugawara, N. Saeki, RILEM Symposium on Fibre-Reinforced Concretes . 2004

机译：混合纤维的耐火性高强度混凝土
5. Evaluation of post-fire strength of concrete flexural members reinforced with glass fiber reinforced polymer (GFRP) bars. [D] . Ellis, Devon S. 2009

机译：评估玻璃纤维增强聚合物（GFRP）钢筋增强的混凝土抗弯构件的后强度。
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。

FIRE RESISTANCE OF HYBRID FIBER REINFORCED HIGH STRENGTH CONCRETE

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