Impact of thickness, void content, temperature and loading rate on tensile fracture toughness and work of fracture of asphalt mixtures- An experimental study using the SCB test

Q2 Materials Science

Engineering Solid Mechanics Pub Date : 2023-01-01 DOI:10.5267/j.esm.2022.12.004

Mohammadreza Malek, M. Keymanesh

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引用次数: 9

Abstract

Asphaltic concrete mixtures are among the most common construction materials for the pavement of roads. As a multi-phase composite mixture with randomly distributed aggregates inside the mastic part, the mechanical properties of such materials can be influenced by different factors. Cracking and induced fracture is among the common degradation and failure modes in these construction mixtures that often takes place in cold regions. In this research, the effects of some influencing parameters including temperature, air void percentage and loading rate are investigated experimentally on the fracture toughness (KIc) and work of fracture (WIc) of hot mix asphalt material. Edge notched semi-circular bend (SCB) specimen was employed to conduct mode I fracture experiments. The thickness of SCB samples were considered as variable and the HMA mixtures were tested with two SCB thicknesses of 30 and 60 mm. The experimental results showed that both fracture toughness and fracture work are increased by increasing the thickness. However, the effect of thickness on the fracture work was much more significant than the KIc value. Also, the fracture and cracking resistance parameters were increased by decreasing the temperature and air void content. Both KIc and WIc values were also increased by increasing the loading rate in the investigated range of 1 to 8 mm/min. The most influencing parameters on the change of fracture resistance parameters were the temperature, loading rate, air void content and thickness, respectively.

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厚度、孔隙含量、温度和加载速率对沥青混合料拉伸断裂韧性和断裂工作的影响——采用SCB试验的实验研究

沥青混凝土混合物是道路路面最常用的建筑材料之一。这种材料是一种多相复合材料，骨料内部是随机分布的，其力学性能会受到不同因素的影响。在寒冷地区，裂缝和诱发断裂是这些建筑混合物中常见的退化和破坏形式。实验研究了温度、孔隙率、加载率等影响参数对热拌沥青材料断裂韧性(KIc)和断裂功(WIc)的影响。采用边缘缺口半圆弯曲(SCB)试件进行I型断裂实验。以SCB试样的厚度为变量，分别以30和60 mm两种SCB厚度对HMA混合物进行了测试。实验结果表明，增加厚度可以提高断裂韧性和断裂功。然而，厚度对裂缝功的影响要比KIc值显著得多。同时，降低温度和孔隙率可以提高材料的抗断裂和抗开裂性能。在1 ~ 8 mm/min的加载速率范围内，KIc和WIc值也随着加载速率的增加而增加。对断裂抗力参数变化影响最大的参数分别是温度、加载速率、气孔含量和厚度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Solid Mechanics Materials Science-Metals and Alloys

CiteScore

3.00

自引率

0.00%

发文量

期刊介绍： Engineering Solid Mechanics (ESM) is an online international journal for publishing high quality peer reviewed papers in the field of theoretical and applied solid mechanics. The primary focus is to exchange ideas about investigating behavior and properties of engineering materials (such as metals, composites, ceramics, polymers, FGMs, rocks and concretes, asphalt mixtures, bio and nano materials) and their mechanical characterization (including strength and deformation behavior, fatigue and fracture, stress measurements, etc.) through experimental, theoretical and numerical research studies. Researchers and practitioners (from deferent areas such as mechanical and manufacturing, aerospace, railway, bio-mechanics, civil and mining, materials and metallurgy, oil, gas and petroleum industries, pipeline, marine and offshore sectors) are encouraged to submit their original, unpublished contributions.