Simplified method for determining zero shear viscosity of high-viscosity modified asphalt and application thereof

A technology of zero-shear viscosity and modified asphalt, which is applied in the direction of flow characteristics, measuring devices, instruments, etc., can solve problems affecting the application and promotion of zero-shear viscosity, achieve the effect of small shear rate range and save test time

Inactive Publication Date: 2011-06-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing method needs to use the special data analysis software "Rheology Advantage", most brands and models of rheometers are not equipped with this software, which affects the application and promotion of zero-shear viscosity in engineering

Method used

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  • Simplified method for determining zero shear viscosity of high-viscosity modified asphalt and application thereof
  • Simplified method for determining zero shear viscosity of high-viscosity modified asphalt and application thereof
  • Simplified method for determining zero shear viscosity of high-viscosity modified asphalt and application thereof

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Experimental program
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Effect test

Embodiment 1

[0033] In order to clarify the simplified test method for the 60°C zero-shear viscosity of high-viscosity modified asphalt, a typical test is now described.

[0034] (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.

[0035] (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.

[0036] (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.

[0037] (4) Carry out the shear rate scanning test: adopt the ste...

Embodiment 2

[0040] Utilize the acquisition method of existing zero-shear viscosity, the reliability of the simplified method of measuring the zero-shear viscosity of high-viscosity modified asphalt of the present invention is verified, and the specific process is:

[0041] (1) Carry out shear rate scanning test, obtain the viscosity-shear rate flow curve of high viscosity modified asphalt;

[0042] (2) Use the Carreau model to fit the viscosity-shear rate measured curve to obtain the zero-shear viscosity fitting value η 0 , the Carreau model is shown in formula (1);

[0043] (3) Analytical shear rate 1.0×10 -3 the s -1 ~1.0s -1The characteristics of the measured viscosity within the range, compare the measured viscosity value with the fitted viscosity value, determine the characteristic shear rate corresponding to the zero shear viscosity, and simplify the test method.

[0044] ( η - η ∞ ...

Embodiment 3

[0057] The internal shear stress of the asphalt pavement structure is calculated by using BISAR software, and the internal shear rate of the pavement structure is calculated by combining the "quaternary and five parameter" model. The calculation process is:

[0058] ①Using BISAR software to calculate the shear stress at different depths and positions of the upper layer of the drainage pavement, the calculation result is 3.58×10 2 Pa~2.28×10 5 Pa, pavement structure and load parameters see Figure 5 .

[0059] ②Using the "four-element, five-parameter" model to calculate the shear rate of the upper layer of the drainage pavement, the range of the shear rate is 1.38×10 -3 the s -1 ~4.64s -1 .

[0060] "Quaternary, five-parameter" creep model see Figure 6 , the calculation formula is shown in formula (2) and formula (3), and the calculation parameters and results are shown in Table 2. The loading time in Table 2 is converted from the driving speed of 60km / h, and the model...

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Abstract

The invention relates to a simplified method for determining zero shear viscosity of high-viscosity modified asphalt and application thereof. The method includes the following steps: A, testing the viscosity and shear rate of the high-viscosity modified asphalt under 60 DEG C through a shear rate scanning test; and B, taking the actual viscosity measured when the shear rate is 10-2s-1 as the zeroshear viscosity under 60 DEG C. The actual viscosity measured when the shear rate is 10-2s-1 is taken as the viscosity behavior eigenvalue of the high-viscosity modified asphalt for paving roads, which reflects the true viscosity characteristic of the high-viscosity modified asphalt on the road surfaces. The test method saves test time, and the data processing is simple, without requiring specialdata processing software, so the method is good for the application and popularization of zero shear viscosity. The characteristic shear rate at zero shear viscosity is 10-2s-1, so viscidities of different high-viscosity modified asphalt at the same shear rate can be compared and the evaluation index is more scientific and more credible.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to a simplified method for measuring the zero-shear viscosity of high-viscosity modified asphalt and an application thereof. Background technique [0002] Asphalt material exhibits pseudo-plastic fluid characteristics under working conditions. When the shear rate is extremely small or extremely large, the viscosity tends to a constant value: the range with a lower shear rate is called the first Newton zone, and the viscosity tends to be maximum. Value, that is, the zero shear viscosity; the range with a higher shear rate is called the second Newton zone, and the viscosity tends to the minimum value, that is, the infinite shear rate viscosity. Such as figure 1 shown. [0003] At present, the method for obtaining zero-shear viscosity is as follows: use the shear rate scanning test to obtain the viscosity-shear rate flow curve of asphalt; use Carreau model and other rheological models t...

Claims

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Application Information

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