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Low temperature performance analysis method for rock asphalt-modified asphalt

A technology of modified asphalt and low temperature performance, applied in the preparation of test samples, material inspection products, etc., can solve the problems of ambiguous evaluation indicators, inability to truly analyze the low temperature performance of modified asphalt, etc., to facilitate drying and heating The effect of melting, preventing uneven heating, and simple method

Inactive Publication Date: 2019-06-28
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

[0004] From the above research results, it can be seen that the low-temperature performance tests of modified asphalt binder are mainly penetration test, ductility test and low-temperature bending beam rheological test, and the evaluation index of low-temperature performance of modified asphalt is still based on the results of the above three tests It is calculated, but the evaluation index is ambiguous, and it cannot truly analyze the low temperature performance of modified asphalt

Method used

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  • Low temperature performance analysis method for rock asphalt-modified asphalt
  • Low temperature performance analysis method for rock asphalt-modified asphalt
  • Low temperature performance analysis method for rock asphalt-modified asphalt

Examples

Experimental program
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Effect test

Embodiment 1～6

[0082] Embodiments 1 to 6 of the present invention disclose a method for preparing rock asphalt modified asphalt:

[0083] (a) Sieve the Buton Rock Asphalt (BRA) with a 0.15 mm square hole sieve to obtain 100 mesh Buton Rock Asphalt particles, which are then placed in an oven at 100 ° C for drying;

[0084] (b) Put the AH-70 base asphalt in an oven at 150°C for 1 hour; then put it on an electric furnace for heating at 150°C, and use glass rods to stir during the heating process to prevent uneven heating of the asphalt. At the same time, insert a mercury thermometer to strictly control the temperature during the heating process to prevent the asphalt from aging due to excessive temperature;

[0085] (c) According to the dosage disclosed in Table 1, add the above-mentioned AH-70 matrix asphalt to the high-speed shearer, and shear at a temperature of 160-170°C. After adding the base asphalt, gradually adjust the rotation speed to 3000rpm so that the Buton rock asphalt is evenly ...

Embodiment 7

[0090] Calculate the equivalent brittle point of the asphalt-modified asphalt prepared in the above-mentioned Examples 1-6, and the results are shown in Table 2 below:

[0091] (A) measure the penetration P of the rock asphalt modified asphalt prepared in Examples 1 to 6 at different temperatures;

[0092] (B) Calculate lgP from the P obtained from the above measurements, and then perform linear fitting on lgP at different temperatures to obtain the regression equation lgP=K+A×T;

[0093] (C) Substitute P=0.12mm into the above regression equation to get Calculate the modified brittle point T 1,2 , which is the equivalent brittle point;

[0094] (D) According to the regression parameter A of the regression equation, according to the formula Calculate the asphalt penetration index PI;

[0095] (E) Analysis of the low-temperature performance of asphalt-modified bitumen based on equivalent brittle point and bitumen penetration index.

[0096] The degree of fit is obtained b...

Embodiment 8

[0102] Calculate the work-to-break and tensile compliance of the asphalt-modified asphalt prepared in Examples 1-6 above, and the results are shown in Table 3 below:

[0103] A, the rock bituminous modified asphalt that embodiment 1~6 prepares is carried out measuring force ductility test, can obtain the tensile force and ductility relation curve of rock bituminous modified asphalt, as figure 1 shown;

[0104] B. Calculate the area enclosed by the relationship curve and the X-axis, which is the breaking work;

[0105] C. According to the relationship curve, calculate the ratio of the tensile force at the peak of the curve to the fracture ductility, which is the tensile compliance.

[0106] table 3

[0107]

[0108]

[0109] Depend on figure 2 From the results in , it can be clearly known that the 10°C ductility of BRA modified asphalt decreases gradually with the increase of BRA content. After adding 5% and 10% BRA, the BRA modified asphalt has the same change law a...

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Abstract

The invention discloses a low temperature performance analysis method for rock asphalt-modified asphalt. The low temperature performance analysis method for the rock asphalt-modified asphalt specifically comprises the following steps: preparing the rock asphalt-modified asphalt; measuring the needle penetration of the prepared rock asphalt-modified asphalt, calculating an equivalent brittle point,and analyzing the low temperature performance of the rock asphalt-modified asphalt according to the equivalent brittle point; performing a ductility test on the rock asphalt-modified asphalt, calculating the breaking work and the compliance in extension according to a test result, and analyzing the low temperature performance of the rock asphalt-modified asphalt according to the breaking work andthe compliance in extension; performing a low temperature bending beam test to obtain the flexural creep stiffness of the rock asphalt-modified asphalt, calculating a comprehensive index according tothe flexural creep stiffness, and analyzing the low temperature performance of the rock asphalt-modified asphalt according to the flexural creep stiffness. By adopting the low temperature performanceanalysis method disclosed by the invention, the low temperature performance of the rock asphalt-modified asphalt can be reflected more scientifically, accurately and comprehensively; moreover, the method is simple and is wide in application range.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a low-temperature performance analysis method of rock asphalt. Background technique [0002] Rock asphalt is formed by geological movement, long-term oxidation and bacteria. It is stable in nature and has good compatibility with petroleum asphalt, including North American rock asphalt, Buton rock asphalt, Xinjiang rock asphalt, Qingchuan rock asphalt, etc. With the development and progress of technology, it has been widely used in road engineering. Rock asphalt can improve the fatigue resistance, high temperature performance and anti-aging performance of asphalt and its mixture, but the incorporation of rock asphalt will also have an adverse effect on the low temperature performance of matrix asphalt. In order to study the influence of the incorporation of rock asphalt on the low-temperature performance of matrix asphalt, researchers at home and abroad have studied a la...

Claims

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Application Information

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IPC IPC(8): G01N33/42G01N1/28
Inventor 吕松涛樊喜雁夏诚东王双双贺芳伟郭彤
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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