Asphalt mortar low-temperature fracture performance test method based on semicircular bending test mode

An asphalt mortar, bending test technology, applied in the direction of using a stable bending force to test the strength of materials, can solve problems such as difficulty in implementation, and achieve the effects of reasonable control of test conditions, simplified sample preparation process, and simple and easy test methods.

Active Publication Date: 2022-03-25
江苏镇淮建设集团有限公司
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Problems solved by technology

However, considering the low-temperature fracture failure process under the condition of large strain, it is difficult to use the existing DSR test method to realize

Method used

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  • Asphalt mortar low-temperature fracture performance test method based on semicircular bending test mode
  • Asphalt mortar low-temperature fracture performance test method based on semicircular bending test mode
  • Asphalt mortar low-temperature fracture performance test method based on semicircular bending test mode

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Embodiment 1

[0030] Three commonly used asphalt mixtures AC-13, SMA-13 ​​and ECA-10 are selected for asphalt pavement, and their corresponding asphalt mortars are back-calculated, and the low-temperature semicircular bending test of asphalt mortars is carried out.

[0031] Such as figure 1 As shown, a method for testing the low-temperature fracture performance of asphalt mortar based on the semicircular bending test mode includes the following steps:

[0032] Step 1: According to the asphalt mixture design parameters, back calculate the corresponding asphalt mortar design parameters, the parameters include asphalt film thickness, asphalt content, maximum nominal particle size and gradation;

[0033] The mix ratio design parameters of the three asphalt mixtures include gradation and effective asphalt content P be ,As shown in Table 1.

[0034] Table 1 Asphalt mixture ratio parameter information

[0035]

[0036] In said step 1, the method for back-calculating the corresponding asphalt...

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Abstract

The invention discloses an asphalt mortar low-temperature fracture performance test method based on a semicircular bending test mode, which comprises the following steps of: 1, inversely calculating corresponding asphalt mortar mix proportion design parameters according to asphalt mixture mix proportion design parameters; 2, determining the semicircular bending loading temperature, the loading rate and the sample size according to the asphalt film thickness and the maximum nominal particle size information of the asphalt mortar obtained in the step 1; 3, according to the loading conditions of the semicircular bending test obtained in the step 2, carrying out a low-temperature fracture performance test on the asphalt mortar, and drawing a force-displacement curve of the asphalt mortar; 4, according to the force-displacement curve obtained in the step 3, the fracture energy index of the asphalt mortar under the low-temperature condition is calculated. According to the method, the stress characteristic that the asphalt mortar sample is easy to creep is fully considered, the loading mode and conditions are optimized, and the method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of road maintenance, and in particular relates to a method for testing the low-temperature fracture performance of asphalt mortar based on a semicircular bending test mode. Background technique [0002] Asphalt mortar is a scale between asphalt mixture and asphalt binder, and it is an indispensable and important scale in the multi-scale evaluation of asphalt pavement materials. Previous studies have shown that the performance of asphalt mortar plays a decisive role in the cohesive fracture of asphalt mixture under low temperature conditions. Therefore, it is necessary to propose a characterization and evaluation method that can directly evaluate the low temperature crack resistance of asphalt mortar materials. At present, there are many studies on the fracture performance of asphalt mixture and asphalt binder at home and abroad, and a variety of test methods and evaluation indicators for evaluating the low-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
CPCG01N3/20
Inventor 杨阳王晓秋马铭浩丁光辉赵晨昀胡睿蒋继望
Owner 江苏镇淮建设集团有限公司
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