Calculation method and device for predicting shear fatigue life of modified asphalt with large mixing amount of rubber powder

A technology of modified asphalt and fatigue life, which is applied in the direction of testing material strength by applying stable shear force, complex mathematical operations, and testing material strength by applying repeated force/pulsation force

Pending Publication Date: 2022-07-01
河北雄安京德高速公路有限公司 +1
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Problems solved by technology

Although rubber powder-modified asphalt is gradually being applied to asphalt pavement (the rubber powder content is generally about 20%), there is still a lack of fatigue protection for large-volume rubber powder modified asphalt (the content reaches 30% and above). Life Prediction Methods

Method used

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  • Calculation method and device for predicting shear fatigue life of modified asphalt with large mixing amount of rubber powder
  • Calculation method and device for predicting shear fatigue life of modified asphalt with large mixing amount of rubber powder
  • Calculation method and device for predicting shear fatigue life of modified asphalt with large mixing amount of rubber powder

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Embodiment Construction

[0042]The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

[0043] In this embodiment, frequency sweep data, linear amplitude sweep data, and time sweep data of parallel-plate asphalt samples at different temperatures, at different sweep times, and time need to be collected. In this embodiment, the specific method for obtaining the above data is as follows:

[0044] The dynamic shear rheometer was used to complete the frequency sweep test on the parallel-plate asphalt samples at 10°C, 20°C, 30°C, 40°C, 50°C, 60°C, and 70°C in turn to obtain frequency sweep data. The frequency sweep range was 0.1-100 rad / s and the strain level was 1%. Among them, the frequency sweep tests at 10°C, 20°C, and 30°C used parallel plates with a diameter of 8 m...

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Abstract

The invention provides a calculation method for predicting the shear fatigue life of high-volume rubber powder modified asphalt. The method comprises the following steps: establishing a fatigue failure criterion of the parallel plate asphalt sample based on linear amplitude scanning data and time scanning data of different scanning durations, and obtaining failure criterion parameters of the fatigue failure criterion based on the fatigue failure criterion; according to the linear viscoelastic characteristic parameters, the damage characteristic parameters and the failure criterion parameters, a fatigue life prediction model is established on the basis of the constitutive relation of the parallel plate asphalt sample, and the fatigue life prediction model is used for predicting the fatigue life of the large-dosage rubber powder modified asphalt under different strain levels. According to the calculation method for predicting the shear fatigue life of the high-mixing-amount rubber powder modified asphalt, provided by the invention, the fatigue performance of the high-mixing-amount rubber powder modified asphalt can be quantitatively analyzed and judged.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a calculation method and a device for predicting the shear fatigue life of modified asphalt with a large amount of rubber powder. Background technique [0002] Under the repeated action of vehicle load, fatigue cracking of asphalt pavement will inevitably occur, and the existence of fatigue cracks seriously affects and restricts the service performance of the pavement. The fatigue resistance of asphalt plays an important role in the anti-fatigue crack cracking ability of asphalt pavement. Therefore, it is necessary to evaluate and judge the fatigue properties of different asphalt materials. The use of waste rubber powder in asphalt modification technology greatly reduces the cost of road maintenance, improves the harmless utilization rate of waste tires, and brings significant economic and social benefits. Although rubber powder-modified asphalt is gradually being app...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/32G06F17/11
CPCG01N3/24G01N3/32G06F17/11G01N2203/0073
Inventor 王国清曹东伟王志斌黄士周邱文利孙彦广许忠印夏磊权恒友马明晓张少波李荣旭冯雷曹佳斌陈攀李倩倩王艳丽罗立红石磊张莹李海冬高新文张博
Owner 河北雄安京德高速公路有限公司
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