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首页> 外文期刊>Engineering Fracture Mechanics >The influence of natural and synthetic fibers on low temperature mixed mode I plus II fracture behavior of warm mix asphalt (WMA) materials
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The influence of natural and synthetic fibers on low temperature mixed mode I plus II fracture behavior of warm mix asphalt (WMA) materials

机译：天然合成纤维对低温混合模式I加II加热混合沥青（WMA）材料的影响

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摘要

In this contribution, low temperature crack growth resistance of Warm Mix Asphalt (WMA) mixtures reinforced with two types of fiber, namely natural Jute fiber and synthetic Polyolefin-Aramid (FORTA) fiber is investigated experimentally. Using semi-circular bend (SCB) specimen, the influence of different fiber weight percentages (0.3%, 0.5% and 0.7%) and test temperatures (0 degrees, -10 degrees and -20 degrees C) on mixed mode I + II fracture toughness values (i.e. K-Ic and K-IIc) are studied. It was shown that both fibers can increase in general the fracture resistance of WMA concrete relative to the control mixture. Mdeover, modes I and II fracture toughness and effective fracture toughness (K-eff) values are increased by decreasing the test temperature or increasing the fiber content. The FORTA fiber provided better crack growth resistance characteristics than the Jute fiber for the WMA mixtures. The effects of both natural and synthetic fibers on enhancing the performance of the tested WMA mixtures was more pronounced for dominantly pure mode I loading case. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在实验上研究了用两种纤维增强的温热沥青（WMA）混合物的低温裂纹生长抗性，即天然黄麻纤维和合成聚烯烃 - 芳酰胺（FORTA）纤维。使用半圆形弯曲（SCB）样本，不同纤维重量百分比的影响（0.3％，0.5％和0.7％）和测试温度（0℃，-10度和-20℃）的混合模式I + II裂缝研究了韧性值（即K-IC和K-IIC）。结果表明，两种纤维都可以普遍增加WMA混凝土相对于对照混合物的裂缝性。通过降低测试温度或增加纤维含量，增加MDEOVER，模式I和II断裂韧性和有效的断裂韧性（K-EFF）值。 FORGA纤维提供比WMA混合物的黄麻纤维更好的裂纹生长抗性特性。天然和合成纤维对增强测试的WMA混合物的性能的影响更加明显，用于纯纯模式I装载案例。 （c）2017 Elsevier Ltd.保留所有权利。

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