A study on the influences of a hygrothermal environment on the compressive strength and failure criteria of asphalt mixtures based on true triaxial tests

Wang, Pan; Elchalakani, Mohamed; Zhou, Yiming; Yan, Shi-tao; Li, Shuang-bei

doi:10.1016/j.heliyon.2022.e10060

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…The octahedral shear stress strength theory takes into account the three-way principal stresses, σ 1 , σ 2 , and σ 3 , in the specimen and is often used to describe the damage of materials under complex stress states, such as asphalt mixtures and concrete. The relationship between the relative normal stress and the relative shear stress of the octahedron of asphalt mixtures can be determined as follows by analyzing the test data points in order to fit the damage meridian equation in the form of a functional equation for the damage criterion of asphalt mixtures [20]:…”

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confidence: 99%

Improvement of the Cracking Moment-Based Asphalt Mixture Splitting Test Method and Splitting Strength Research

Guan,

Pan,

Yang

et al. 2024

Buildings

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The asphalt mixture splitting test is one of the most important methods for measuring asphalt’s tensile properties. To characterize the limitations of the traditional splitting test and the influence of the specimen size and loading conditions on the accuracy of the test, the factors affecting the strength of the splitting test were analyzed to reveal the splitting failure state and establish a unified representation model between the splitting and direct tensile tests. Initially, the moment of specimen cracking was taken as a key indicator, combined with image processing technology, to establish a set of criteria to judge the splitting test. Subsequently, standardized splitting tests were conducted and compared to tests of different specimen sizes and loading methods. Based on the octahedral strength theory, the stress points before and after the improved test were compared to the existing failure criteria. Direct tensile and splitting tests were conducted at different rates, and a unified strength–rate function model was established, realizing the unified representation of direct tensile and splitting tests. The research results indicate that the standardized splitting test is prone to the phenomenon wherein the specimen end face cracks before the center, affecting the accuracy of the test and potentially leading to redundant material strength evaluations. Using a loading method with a “35 mm specimen thickness” and a “0.3 mm rubber gasket + 12.7 mm arc-shaped batten” can essentially achieve the test hypothesis of “cracking at the center first”, resulting in less discrete outcomes and closer alignment to the three-dimensional stress failure state. The tensile and splitting strengths are both power function relationships with the rate as the independent variable, establishing a unified function model of the tensile and failure strengths. The research provides a more reliable testing method and calculation model for asphalt pavement structure design, and it also provides an effective basis for the improvement of splitting tests on materials such as concrete and rock.

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confidence: 99%