MICRO ANALYTICAL INVESTIGATIONS ON THE EFFECT OF POLYPROPYLENE FIBRES IN FIRE EXPOSED HIGH-PERFORMANCE CONCRETE (HPC)

机译：聚丙烯纤维在火暴露高性能混凝土（HPC）中的微观分析研究

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The development of cement based materials has reached a permanent upside trend within the former decades. From the point of time, the last step in this development row is high-performance concrete (HPC). The concrete recipes have to be developed according to the application case, if the high efficiency and the costs shall be considered together. One aspect which is not sufficiently cleared for such cementitious materials is their spalling behaviour and the fire resistance. One passable way to reduce the spalling on a tolerable mass is the use of plastic fibres, e.g. polypropylene fibres. However, up to know only phenomenological characterizations exist which back up the positive effects of such fibres with regard to fire-exposed HPC. The paper will give a general survey on the spalling mechanisms due to fire exposure as well as an overview on tests which are focused on micro analytical investigations on the effect of polypropylene fibres in fire-exposed HPC. Therefore, several micro analytical test methods were used, such as DTG, DTA, REM, stereo microscopy and XRD to make it possible to describe the mechanisms of permeability increase within the dense matrix, the pores structure and the interfacial transition zone between matrix, aggregates and fibres.

机译：在过去的几十年中，水泥基材料的发展已达到永久的上升趋势。从时间上看，此开发行中的最后一步是高性能混凝土（HPC）。如果要兼顾高效率和高成本，则必须根据应用案例制定具体的配方。对于这种胶凝材料，尚未充分清除的一个方面是它们的剥落行为和耐火性。减少可承受质量上的剥落的一种可行方法是使用塑料纤维，例如塑料纤维。聚丙烯纤维。然而，据了解，仅存在现象学特征支持这种纤维对着火的HPC的积极作用。本文将对因火灾引起的剥落机制进行一般性调查，并对测试进行概述，这些测试的重点是对聚丙烯纤维在受火HPC中的影响进行微观分析研究。因此，使用了几种微观分析测试方法，例如DTG，DTA，REM，体视显微镜和XRD，以描述致密基质内渗透率增加的机理，孔结构以及基质，骨料之间的界面过渡区。和纤维。

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来源
《RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.1; 20040920-22; Varenna(IT)》|2004年|P.659-668|共10页
会议地点 Varenna(IT)
作者
Frank Dehn; Kay Wille;
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Leipzig University, Germany;

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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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1. Mechanical properties and microstructure of high strength concrete containing polypropylene fibres exposed to temperatures up to 200 deg C [J] . A. Noumowe Cement and Concrete Research . 2005,第11期

机译：包含聚丙烯纤维的高强度混凝土的机械性能和微观结构暴露于200摄氏度以下
2. Microstructural investigation of calcium aluminate cement-based ultra-high performance concrete (UHPC) exposed to high temperatures [J] . N.K. Lee, K.T. Koh, S.H. Park, Cement and Concrete Research . 2017,第期

机译：高温暴露于高温的铝酸钙基础超高性能混凝土（UHPC）的微观结构调查
3. Effects of polypropylene fibres in concrete: Microstructure after fire testing and chloride migration [J] . J.A. Larbi, R.B. Polder Heron . 2007,第4期

机译：聚丙烯纤维在混凝土中的作用：耐火试验和氯化物迁移后的微观结构
4. MICRO ANALYTICAL INVESTIGATIONS ON THE EFFECT OF POLYPROPYLENE FIBRES IN FIRE EXPOSED HIGH-PERFORMANCE CONCRETE (HPC) [C] . Frank Dehn, Kay Wille, International Union of Testing amp, RILEM Symposium on Fibre-Reinforced Concretes . 2004

机译：微观分析研究对灭火中聚丙烯纤维的影响高性能混凝土（HPC）
5. Development and construction of low-cracking high-performance concrete (LC-HPC) bridge decks: Free shrinkage, mixture optimization, and concrete production [D] . Lindquist, Will David 2008

机译：低裂缝高性能混凝土（LC-HPC）桥面的开发和建设：自由收缩，优化混合料和混凝土生产
6. Role of Polypropylene Fibres in Concrete Spalling Risk Mitigation in Fire and Test Methods of Fibres Effectiveness Evaluation [O] . Izabela Hager, Katarzyna Mróz 2019

机译：聚丙烯纤维在减轻火灾中混凝土剥落风险中的作用及纤维有效性评估的测试方法
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。

MICRO ANALYTICAL INVESTIGATIONS ON THE EFFECT OF POLYPROPYLENE FIBRES IN FIRE EXPOSED HIGH-PERFORMANCE CONCRETE (HPC)

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