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Role of Polypropylene Fibres in Concrete Spalling Risk Mitigation in Fire and Test Methods of Fibres Effectiveness Evaluation

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

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The explosive behaviour of concrete in fire is observed in rapidly heated concrete. The main factors controlling the occurrence of spalling are related to the material’s low porosity and high density as well as the limited ability to transport gases and liquids. Thus, for high-strength, ultrahigh-strength, and reactive powder concrete, the risk of spalling is much higher than for normal-strength concrete. The paper presents the discussion on the leading hypothesis concerning the occurrence of concrete spalling. Moreover, the methods for spalling prevention, such as polypropylene fibre application, which has been found to be an effective technological solution for preventing the occurrence of spalling, are presented. Various tests and testing protocols are used to screen concrete mixes propensity toward spalling and to evaluate the polypropylene fibres’ effectiveness in spalling risk mitigation. The most effective testing methods were selected and their advantages were presented in the paper. The review was based mainly on the authors’ experiences regarding high performance concrete, reactive powder concrete testing, and observations on the effect of polypropylene fibres on material behaviour at high temperature.
机译：在快速加热的混凝土中观察到混凝土在火中的爆炸行为。控制剥落发生的主要因素与材料的低孔隙率和高密度以及有限的气体和液体传输能力有关。因此，对于高强度，超高强度和反应性粉末混凝土，剥落的风险要比普通强度混凝土高得多。本文介绍了有关混凝土剥落发生的主要假设的讨论。此外，提出了防止剥落的方法，例如聚丙烯纤维的应用，已发现该方法是防止剥落发生的有效技术方案。各种测试和测试规程用于筛选混凝土混合料的剥落倾向，并评估聚丙烯纤维在减轻剥落风险方面的有效性。本文选择了最有效的测试方法，并介绍了它们的优点。这篇综述主要基于作者在高性能混凝土，活性粉末混凝土测试方面的经验，以及对聚丙烯纤维对高温下材料性能的影响的观察。

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