Retained properties of concrete exposed to high temperatures: Size effect

Omer Arioz

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Retained properties of concrete exposed to high temperatures: Size effect

机译：高温下混凝土的保留特性：尺寸效应

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Concrete as a construction material is likely exposed to high temperatures during fire. The retained properties of concrete after such exposures are still of great importance in terms of the serviceability of structures. This paper presents the effects of high temperatures on the physical, mechanical, and microstructural properties of concrete. Specimens with different sizes were exposed to high temperatures ranging from 200 to 1200℃. The compressive strength, splitting tensile strength, ultrasonic pulse velocity, and rebound numbers of the specimens were determined. The microstructures of the specimens were examined by scanning electron microscope (SEM) analyses. The test results indicated that the retained compressive strength of concrete considerably decreased with increase in temperature. The effect of specimen size on the retained compressive strength was not pronounced. The retained splitting tensile strength of concrete remarkably reduced as the temperature was increased. The specimen size played an important role on the retained splitting tensile strength of concrete up to 400℃. The test results revealed that ultrasonic pulse velocity (UPV) test can be successfully used in order to check the uniformity of fire-damaged structures. The rebound numbers decreased with increase in exposure temperature. SEM studies on specimens exposed to 800℃ revealed significant changes in the microstructure of the concrete.

机译：作为建筑材料的混凝土在火灾中可能会暴露在高温下。就结构的可使用性而言，在这种暴露之后，混凝土的保留性质仍然非常重要。本文介绍了高温对混凝土的物理，机械和微观结构特性的影响。不同尺寸的样品要经受200至1200℃的高温。测定样品的抗压强度，劈裂抗拉强度，超声脉冲速度和回弹数。通过扫描电子显微镜（SEM）分析来检查样品的微观结构。试验结果表明，随着温度的升高，混凝土的保留抗压强度大大降低。样品尺寸对保留抗压强度的影响并不明显。随着温度的升高，混凝土的保留劈裂抗拉强度显着降低。试件尺寸对400℃以下混凝土的劈裂抗拉强度具有重要作用。测试结果表明，超声脉冲速度（UPV）测试可成功用于检查火灾后结构的均匀性。回弹数随暴露温度的升高而降低。 SEM对暴露于800℃的试样的研究表明，混凝土的微观结构发生了显着变化。

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《Fire and materials》 |2009年第5期|211-222|共12页
作者
Omer Arioz;
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作者单位

Faculty of Engineering and Architecture, Department of Civil Engineering, Anadolu University,Iki Eylul Campus, 26555 Eskisehir, Turkey　Omer Arioz, faculty ot bngineenng and Architecture, Department of Civil bngineenng, Anadolu University, Iki Eylul Campus, 26555 Eskisehir, Turkey;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
concrete; fire; high temperatures; strength; UPV; rebound number; SEM;

机译：具体;火;高温;强度;UPV;回弹数;扫描电镜;

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1. An experimental investigation into the influence of specimen size, in-situ pore pressures and temperatures on the spalling of difference size concrete panels when exposed to a hydrocarbon fire [J] . M. Guerrieri, S. Fragomeni MATEC Web of Conferences . 2013,第3期

机译：对暴露于碳氢化合物火中的试样尺寸，原位孔隙压力和温度对不同尺寸混凝土板剥落的影响进行实验研究
2. Effect of waste marble powder and rice husk ash on the microstructural, physico-mechanical and transport properties of foam concretes exposed to high temperatures and freeze-thaw cycles [J] . Gencel Osman, Benli Ahmet, Bayraktar Oguzhan Yavuz, Construction and Building Materials . 2021,第Jula12期

机译：废物大理石粉和稻壳对高温暴露于高温泡沫混凝土的微观结构，物理 - 机械和运输性能的影响
3. A review of residual strength properties of normal and high strength concrete exposed to elevated temperatures: Impact of materials modification on behaviour of concrete composite [J] . Babalola O. E., Awoyera Paul O., Le D. -H., Construction and Building Materials . 2021,第Auga16期

机译：升高温度下的正常和高强度混凝土残余强度特性评析：材料改性对混凝土复合材料行为的影响
4. THE IMPACT OF THE ADDITION OF POLYPROPYLENE FIBRES ON THE MECHANICAL PROPERTIES OF HIGH PERFORMANCE CONCRETES EXPOSED TO HIGH TEMPERATURES [C] . Izabela HAGER, Pierre PIMIENTA RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.1; 20040920-22; Varenna(IT) . 2004

机译：聚丙烯纤维的添加对高温下高性能混凝土力学性能的影响
5. Damage mechanisms and repairability of high strength concrete exposed to elevated temperatures. [D] . Kerr, Elizabeth Ann. 2008

机译：暴露于高温下的高强度混凝土的破坏机理和可修复性。
6. Properties of Ambient-Cured Normal and Heavyweight Geopolymer Concrete Exposed to High Temperatures [O] . Farhad Aslani, Zohaib Asif 2019

机译：常温常压和重质地质聚合物混凝土的高温特性
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. Moisture Measurement in Concrete Constructions Exposed to Temperature andMoisture Variations. Nordic Mini-Seminar of the Nordic Concrete Federation. Held in Espoo, Finland on August 22, 1997 [R] . Kukko, H., Paroll, H. 1997

机译：混凝土结构暴露于温度和湿度变化的水分测量。北欧混凝土联合会北欧迷你研讨会。 1997年8月22日在芬兰埃斯波举行

Retained properties of concrete exposed to high temperatures: Size effect

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