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Evaluation method for temperature sensitivity based on asphalt cement

An evaluation method and technology of asphalt glue, applied in the directions of flow characteristics, analysis materials, measurement devices, etc., can solve the problem that the temperature change of the viscoelastic state of the asphalt binder cannot be effectively reflected, and the viscoelastic characteristics of the asphalt binder cannot be effectively reflected with temperature. It can not fully reflect the temperature sensitivity of asphalt binder and other problems, so as to achieve the effect of high accuracy, high precision and wide temperature range.

Inactive Publication Date: 2014-03-05
HOHAI UNIV
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Problems solved by technology

The complex modulus index (GTS) method uses the G* structure temperature sensitivity index GTS that reflects the physical and mechanical indicators of the material. This method broadens the temperature range and overcomes the lack of test accuracy and extension error of the penetration index (PI) method. , but because this method only uses a single index to evaluate the temperature sensitivity of asphalt binder, it cannot effectively reflect the change of the viscoelastic properties of asphalt binder with temperature, let alone fully reflect the temperature sensitivity of asphalt binder
How to overcome the deficiencies of the existing temperature-sensitivity indexes for evaluating various asphalt binders including the complex modulus index (GTS) method, and cannot effectively reflect the change of the viscoelastic state of asphalt binders with temperature has become an important issue. One of the key problems to be solved urgently in the technical field of road engineering pavement materials

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  • Evaluation method for temperature sensitivity based on asphalt cement
  • Evaluation method for temperature sensitivity based on asphalt cement
  • Evaluation method for temperature sensitivity based on asphalt cement

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specific Embodiment

[0029] Specific examples of evaluating and comparing the temperature sensitivity of asphalt binders between the present invention and the Penetration Index (PI) method, the Penetration Viscosity (PVN) method, and the Complex Modulus Index (GTS) method are as follows:

[0030] The specific conditions for implementation are: the asphalt used is 70 # For road petroleum asphalt, I-DSBS modified asphalt and rubber asphalt, the particle size of rubber powder is 40 mesh, and the mass of rubber powder accounts for 70 # 20% of the quality of road petroleum asphalt. When preparing rubber asphalt, it is heated by a stirring oil bath. The temperature of the stirring oil bath is automatically controlled by an electronic temperature controller. The temperature control temperature is 180±5°C, the stirring speed is 1000 rpm, and the mixing time for 45min.

[0031] Penetration index (PI) method: Use 5 temperatures of 10, 15, 20, 25, and 30°C to carry out the penetration test, and take the pen...

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Abstract

The invention relates to an evaluation method for temperature sensitivity based on asphalt cement. The evaluation method is characterized in that, the concrete steps comprise: first, asphalt cement raw materials are prepared; second, asphalt cement finished products are tested: by utilization of a temperature scanning test method in a DSR dynamic shear rheometer, the storage modulus (G') and loss modulus (G") of the asphalt cement are measured; third, the temperature sensibility of the asphalt cement is determined: the measuring parameters G', G" and T are subjected to double logarithm regression, linear regression lines are obtained, and the absolute values of the slopes of the linear regression lines are taken as a storage modulus temperature sensitivity index and a loss modulus temperature sensitivity index respectively. The evaluation method can evaluate and determine temperature sensitivity of asphalt cement well, and provides reasonable guidance during usage of pavements of road petroleum asphalt, modified asphalt of SBS and the like or rubber asphalt.

Description

technical field [0001] The invention belongs to the technical field of road engineering pavement materials, in particular to an evaluation method based on temperature sensitivity of asphalt cement. Background technique [0002] Compared with other engineering materials, asphalt material has its particularity. Under the condition of high temperature or low speed load, it behaves as a flowing liquid, and under the condition of low temperature or high speed load, it behaves as an elastic solid. Asphalt materials have viscoelastic properties under service conditions, and their viscous and elastic components will change with temperature. The temperature sensitivity of asphalt materials is an important index to determine the workability of asphalt and the serviceability of asphalt applied to pavement. The existing methods for evaluating the temperature sensitivity index of asphalt mainly include the penetration index (PI) method, the penetration viscosity (PVN) method, the viscos...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 于新王英尹龙
Owner HOHAI UNIV
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