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Loxiong viscosity behavior measuring method of high-viscosity modified asphalt and application thereof

A technology of modified asphalt and measurement method, applied in the directions of flow characteristics, measuring devices, instruments, etc., can solve the problems of inability to determine the viscosity characteristics of capillary tube viscosity, inability to determine the shear rate of capillary tube viscosity, cumbersome test process, etc.

Inactive Publication Date: 2010-07-21
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main problem in evaluating the viscosity of asphalt with the vacuum decompression capillary method is that the high-viscosity modified asphalt material is a non-Newtonian fluid at 60°C, and the viscosity is different at different shear rates, and the vacuum decompression capillary method cannot determine the shear value corresponding to the capillary viscosity Therefore, it is impossible to determine whether the capillary viscosity really reflects the viscosity characteristics of high-viscosity modified asphalt in the pavement structure, and there is no practical significance for comparing the capillary viscosity under different shear rates.
In addition, the use of vacuum decompression capillary for viscosity measurement has disadvantages such as cumbersome test process, large dispersion of measurement results, and difficult cleaning of the capillary after the test.

Method used

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  • Loxiong viscosity behavior measuring method of high-viscosity modified asphalt and application thereof
  • Loxiong viscosity behavior measuring method of high-viscosity modified asphalt and application thereof
  • Loxiong viscosity behavior measuring method of high-viscosity modified asphalt and application thereof

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Embodiment Construction

[0049] In order to clarify the 60°C zero-shear viscosity test method of high-viscosity modified asphalt, a typical test is now used to describe it.

[0050](1) Forming test piece: heat the asphalt to a flowing state, pour at least 3 circular parallel test pieces with a diameter of about 25 mm and a height of 1 mm to 2 mm, and place the asphalt test pieces at room temperature to cool for no less than 30 minutes.

[0051] (2) Place the test piece: choose a circular plate fixture with a diameter of 25 mm, place the asphalt test piece between the fixtures, adjust the distance between the upper and lower fixtures to 1050 μm, and adjust the distance between the fixtures to 1000 μm after trimming the sample.

[0052] (3) Heat preservation: immerse the trimmed asphalt specimen and fixtures in a 60°C water bath for heat preservation, and the heat preservation of the specimen should not be less than 10 minutes.

[0053] (4) Carry out the shear rate scanning test: the steady flow loading...

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Abstract

The invention relates to a loxiong viscosity behavior measuring method of a high-viscosity modified asphalt and an application thereof, which comprises the following steps: A. using the shearing rate scan test to obtain the viscosity-shearing rate flow curve of the high-viscosity modified asphalt at 60 DEG C; and B. fitting the curve obtained in the step A to obtain the 60 DEG C zero shear viscosity. The 60 DEG C zero shear viscosity obtained by using the method can be used for evaluating the viscosity behavior of the high-viscosity modified asphalt in a pavement structure. The invention is based on following references: the high-viscosity modified asphalt presents the characteristic of pseudo-plastic fluid at the shearing rate of 1.25*10<-5>s<-1>-1250s<-1>, the viscosity tends to be the zero shear viscosity in a first Newtonian region, and the common range in the first Newtonian region is completely matched with the shearing rate range in the pavement structure in the aspect of magnitude order, so the 60 DEG C zero shear viscosity can effectively reflect the viscosity characteristic of the high-viscosity modified asphalt in the pavement structure.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to a method for measuring the viscosity performance of high-viscosity modified asphalt roads and an application thereof. Background technique [0002] Viscosity is an important technical indicator for evaluating the bonding properties of road asphalt materials, and it is also a conditional indicator, and its size depends on the test method and test conditions. At present, the 60°C capillary viscosity of high-viscosity modified asphalt is mainly measured by vacuum decompression capillary method to reflect the road viscosity characteristics of asphalt. [0003] The main problem in evaluating the viscosity of asphalt with the vacuum decompression capillary method is that the high-viscosity modified asphalt material is a non-Newtonian fluid at 60°C, and the viscosity is different at different shear rates, and the vacuum decompression capillary method cannot determine the shear value corres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00
Inventor 李立寒耿韩孙艳娜
Owner TONGJI UNIV
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