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首页> 外文期刊>Construction and Building Materials >Flexural strength and impact resistance study of fibre reinforced concrete in simulated aggressive environment
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Flexural strength and impact resistance study of fibre reinforced concrete in simulated aggressive environment

机译：模拟侵蚀环境下纤维混凝土的抗弯强度和抗冲击性研究

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摘要

In addition to being exposed to chloride and sulphate attacks, marine structures are subject to seismic and impact loads resulting from waves, impact with solid objects, and water transports. Therefore, the flexural behaviour and impact resistance of Fibre-Reinforced Concrete (FRC) in marine environment must be elucidated. However, such information is scarcely reported. Therefore, this study aims to explore the effects of simulated aggressive environments on flexural strength and impact resistance of FRC and to identify the relationship between the two parameters. Three types of fibres, namely, coconut fibre, Bar-chip fibre (BF), and alkali-resistant glass fibre, were used in this study. The fibre dosage ranged from 0.6% to 2.4% of the binder volume. All mixes have constant water/binder ratio of 0.37 and their compressive strengths were all exceeding 60 MPa. The specimens were prepared and exposed to three different aggressive exposure environments, namely, tropical climate, cyclic air and seawater conditions, and sea-water environment for up to 180 days. Results indicate that flexural strength and impact resistance of FRC have a direct relationship with fibre content. Nonetheless, change in fibre type is more significant than increasing fibre dosage in enhancing flexural strength but alteration in both matters would significantly impact the impact resistance. Tensile strength of an individual BF (640 MPa) is much higher than the flexural strength of the BFRC composite. Thus, failure of concrete matrix was observed to occur prior to the rupture of the fibre which in turn resulted in fibre pull out from the concrete matrix. Among the various FRC examined, FRC containing the highest BF content (2.4%) demonstrated the best flexural strength performance. The flexural strength of the Barchip FRC was observed to be increased by 11-13% in all exposure environments after 180 days. The pre-crack energy absorptions, which were determined through impact load test were found to increase by 60-63% as compared to the control concrete, which exhibited no post-crack energy absorption. Meanwhile, the post-crack energy absorptions of the 2.4BF were found to range between 3.67 J and 3.71 J for various environmental exposure conditions. Analysis of variance (ANOVA) results showed that flexural strengths were significantly increased after six months of exposure to the various aggressive environment conditions, especially in seawater. This could be due to formation of salt crystals which contributed towards enhancing the fibre/matrix frictional bond. However, the exposure environments have no significant effect on impact resistance performance. A logarithmic relationship was found between flexural strength and total impact energy absorption.
机译：除了暴露于氯化物和硫酸盐的侵蚀之外，海洋结构还受到波浪，固体物体撞击和水运输所产生的地震和冲击载荷。因此，必须阐明纤维增强混凝土（FRC）在海洋环境中的抗弯性能和抗冲击性。但是，很少报道这种信息。因此，本研究旨在探讨模拟侵略环境对FRC弯曲强度和抗冲击性的影响，并确定这两个参数之间的关系。这项研究使用了三种类型的纤维，即椰子纤维，条状碎片纤维（BF）和耐碱玻璃纤维。纤维用量为粘合剂体积的0.6％至2.4％。所有混合物的水/粘结剂比恒定为0.37，抗压强度均超过60 MPa。制备标本，并将其暴露于三种不同的侵蚀性暴露环境下，即热带气候，循环空气和海水条件以及海水环境长达180天。结果表明，FRC的弯曲强度和抗冲击性与纤维含量有直接关系。尽管如此，纤维类型的改变在增加挠曲强度方面比增加纤维用量更为重要，但是两种情况的改变都会显着影响耐冲击性。单个BF的拉伸强度（640 MPa）远高于BFRC复合材料的抗弯强度。因此，观察到混凝土基质的破坏发生在纤维断裂之前，这继而导致纤维从混凝土基质中拉出。在所检查的各种FRC中，BF含量最高（2.4％）的FRC表现出最佳的抗弯强度性能。在180天后的所有暴露环境中，Barchip FRC的弯曲强度均提高了11-13％。发现通过冲击载荷试验确定的裂纹前能量吸收与对照混凝土相比没有显示裂纹后能量吸收，而该增加了60-63％。同时，发现在各种环境暴露条件下，2.4BF的裂纹后能量吸收范围在3.67 J和3.71 J之间。方差分析（ANOVA）结果表明，在各种侵略性环境条件下（尤其是在海水中）暴露六个月后，抗弯强度显着提高。这可能是由于形成了盐晶体，该盐晶体有助于增强纤维/基体的摩擦键。但是，暴露环境对抗冲击性能没有显着影响。在抗弯强度和总冲击能量吸收之间发现了对数关系。

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