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 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: 2010-09-22
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

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 zero shear viscosity of high-viscosity modified asphalt at 60°C, a typical test is now combined.

[0034] (1) Molded test piece: Heat the asphalt to a flowing state, and pour at least 3 circular parallel test pieces with a diameter of about 25mm and a height of 1mm to 2mm. The asphalt test piece is placed at room temperature to cool, and the cooling time is not less than 30 minutes.

[0035] (2) Place the test piece: choose a 25mm diameter circular flat plate clamp, place the asphalt test piece between the clamps, adjust the distance between the upper and lower clamps to 1050μm, and adjust the clamp spacing to 1000μm after trimming the sample.

[0036] (3) Insulation: Immerse the trimmed asphalt specimens and fixtures in a 60℃ water bath for heat preservation. The heat preservation specimens shall not be less than 10 minutes.

[0037] (4) Carry out the shear rate scanning test: adopt the steady flow loading mode, and the she...

Embodiment 2

[0040] Utilizing the existing method for obtaining zero-shear viscosity, the reliability of the simplified method for measuring the zero-shear viscosity of high-viscosity modified asphalt of the present invention is verified. The specific process is:

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

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

[0043] (3) Analysis shear rate 1.0×10 -3 s -1 ~1.0s -1 For the 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 ∞ ) ( η - η ∞ ) = 1 ( 1 + ( KD ) 2 ) n / 2 - - ...

Embodiment 3

[0057] Using BISAR software to calculate the internal shear stress of the asphalt pavement structure, combined with the "four-element, five-parameter" model to calculate the internal shear rate of the pavement structure. The calculation process is:

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

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

[0060] See the "quaternary, five-parameter" creep model Image 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 calculated from the driving speed of 60km / h, and the model parameters ar...

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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 zero shear 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 special data 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 its application. 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 of lower shear rate is called the first Newtonian zone, and the viscosity tends to be extremely large Value, namely zero-shear viscosity; the range of higher shear rate is called the second Newtonian zone, and the viscosity tends to a minimum value, namely infinite shear rate viscosity. Such as figure 1 Shown. [0003] At present, the method of obtaining zero-shear viscosity is: use shear rate scanning test to obtain asphalt viscosity-shear rate flow curve; use Carreau model and other rheological models to fit the viscosity-shear rate flow curve to ob...

Claims

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Application Information

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IPC IPC(8): G01N11/00
Inventor 李立寒耿韩孙艳娜
Owner TONGJI UNIV
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