Investigation of mode I fracture resistance of hot mix asphalt using three testing protocols under the low temperature

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-03-18 DOI:10.1016/j.tafmec.2025.104937

Weimin Song, Wenlong Yan, Hao Wu, Zhicai Cui

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引用次数: 0

Abstract

A variety of testing methodologies are currently employed to assess the fracture behaviors of asphalt mixtures. However, there is a notable variability in fracture parameters, such as the stress intensity factor (SIF) and fracture energy, when derived from different testing approaches. This study investigated the variations in fracture parameters, including the SIF, fracture energy, tensile stiffness index (TSI), and modified tensile stiffness index (MTSI), obtained from three distinct testing methods: the semi-circular bending (SCB) test, the three-point bending (TPB) test, and the semi-circular tension (SCT) test, all conducted under low-temperature conditions. The maximum tangential strain (MTS) criterion was utilized to elucidate the origins of the observed differences among the various fracture assessment methods. Results revealed that the load–displacement curves from the SCB and TPB tests were similar, characterized by a linear escalation in load up to the peak point, followed by a precipitous decline with minimal deformation post-peak load. In contrast, the SCT test exhibited a divergent behavior, with a gradual decrease in load post-peak and noticeable displacements. The TPB tests generated the highest fracture parameters in terms of SIF, fracture energy, and TSI. The SCB tests provided superior results for the SIF and fracture energy compared to the SCT tests. The AC10 mixture demonstrated enhanced fracture resistance relative to the AC16 mixture across all these parameters, which was mainly ascribed to the lower porosity of AC10. The introduction of a modified tensile stiffness index (MTSI) resulted in a lower coefficient of variance (COV) when compared to the traditional TSI, indicating less dispersion was induced among different test methods. Upon employing the MTS criterion in the analysis of fracture, it is determined that the inherent stress intensity factors (K_IC) for both AC10 and AC16 asphalt mixtures exceeded the apparent stress intensity factors (K_If). Furthermore, the consideration of T-stress in the analysis effectively diminished the variability in K_If values observed across the different testing methodologies.

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目前有多种测试方法可用于评估沥青混合料的断裂行为。然而，不同测试方法得出的应力强度因子（SIF）和断裂能等断裂参数存在明显差异。本研究调查了断裂参数的变化，包括 SIF、断裂能、拉伸刚度指数（TSI）和修正拉伸刚度指数（MTSI），这些参数来自三种不同的测试方法：半圆弯曲（SCB）测试、三点弯曲（TPB）测试和半圆拉伸（SCT）测试，均在低温条件下进行。利用最大切向应变（MTS）标准来阐明各种断裂评估方法之间存在差异的原因。结果表明，SCB 和 TPB 试验的载荷-位移曲线相似，都是载荷线性上升至峰值，然后急剧下降，峰值载荷后变形极小。相比之下，SCT 试验表现出不同的行为，峰值后载荷逐渐减小，位移明显。就 SIF、断裂能和 TSI 而言，TPB 试验产生的断裂参数最高。与 SCT 试验相比，SCB 试验的 SIF 和断裂能结果更好。与 AC16 混合物相比，AC10 混合物在所有这些参数上都表现出更强的抗断裂性，这主要归因于 AC10 混合物的孔隙率较低。与传统的拉伸刚度指数（TSI）相比，改良拉伸刚度指数（MTSI）的引入降低了方差系数（COV），这表明不同测试方法之间的离散性较小。在断裂分析中采用 MTS 标准后，可以确定 AC10 和 AC16 沥青混合料的固有应力强度因子 (KIC) 都超过了表观应力强度因子 (KIf)。此外，在分析中考虑 T 应力可有效减少在不同测试方法中观察到的 KIf 值的变化。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.