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首页> 外文期刊>The international journal of pavement engineering >Experimental and numerical investigations of non-standardised semi-circular bending test for asphalt concrete mixtures
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Experimental and numerical investigations of non-standardised semi-circular bending test for asphalt concrete mixtures

机译：沥青混凝土混合物非标准化半圆形弯曲试验的实验性和数值研究

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摘要

Fracture due to mechanical loads is one of the main distresses of asphalt concrete (AC) pavement. Characterisation of fracture properties of AC is thus vital. The semi-circular bending (SCB) test is recognised as a simple but robust test to evaluate the fracture resistance of AC. Current SCB test standards adopt a fixed sample geometry of 150 mm diameter, while the 100 mm diameter sample has not standardised yet. However, in specifications for AC design and quality control purposes, such as indirect tensile test and resilient modulus, cylindrical samples with either 100 or 150 mm diameter obtained from existing pavements or fabricated in laboratories are used in parallel. This raises the question of whether the 100 mm diameter SCB sample is applicable. The literature review shows the limited investigation into the applicability of SCB test on 100 mm diameter. It also shows no clear justification for why standardised geometry is preferred compared to 100 mm one. For these reasons, this study attempts to investigate the applicability of the SCB test with a non-standardised 100 mm diameter samples using a combined experimental and numerical approach. The numerical approach is based on the discrete element method combining with an enriched cohesive damage-plasticity contact model suitable for AC. The predictive capability of the numerical model is first assessed against the experimental data. Subsequently, the validated numerical model is applied to investigate the effects of notch length and sample thickness on the fracture properties of AC. The study demonstrated that the proposed non-standardised sample geometry of SCB test can provide reliable results with high repeatability. Furthermore, with an appropriate notch length and sample thickness, the non-standardised test can produce a similar value of fracture toughness as the standardised test. These results suggest that the non-standardised test can be used to characterise the fracture properties of AC mixes.
机译：由于机械负荷导致的骨折是沥青混凝土（AC）路面的主要困难之一。因此，AC的断裂性能表征是至关重要的。半圆形弯曲（SCB）测试被认为是一种简单但稳健的测试，以评估AC的裂缝抗性。当前的SCB测试标准采用直径为150毫米的固定样品几何形状，而100毫米直径的样品尚未标准化。然而，在AC设计和质量控制目的的规范中，例如间接拉伸试验和弹性模量，并联从现有路面中获得的100或150mm直径的圆柱形样品，并并联使用。这提出了100 mm直径的SCB样品是适用的问题。文献综述表明，对SCB测试的适用性对100 mm直径的适用性进行了有限的调查。它还没有针对100 mm相比，标准化几何形状优选的原因没有明确的理由。出于这些原因，本研究试图使用组合的实验和数值方法来研究SCB测试与非标准化100mm直径样品的适用性。数值方法是基于与AC适用于AC的富集的内聚损伤可塑性接触模型的离散元件方法。首先根据实验数据评估数值模型的预测能力。随后，应用验证的数值模型来研究Notch长度和样品厚度对Ac的裂缝性能的影响。该研究表明，所提出的SCB测试的非标准化样品几何形状可以提供具有高可重复性的可靠结果。此外，通过适当的凹口长度和样品厚度，非标准化试验可以产生与标准化测试相似的断裂韧性值。这些结果表明，非标准化试验可用于表征AC混合物的断裂性质。

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