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Test method of doping quantity of modifier in SBS modified asphalt

A technology of modified asphalt and testing method, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of hundreds of thousands or even millions, unreliable, Not suitable for construction site promotion and application, etc.

Inactive Publication Date: 2011-01-19
CHANGAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0005] However, at present, there is no test method for quickly and accurately determining the amount of modifier in SBS modified asphalt, and it is difficult to guarantee the service life of the product
Although it is also possible to estimate the amount of modifier SBS in modified asphalt by measuring the softening point, penetration, ductility and other indicators, but because these indicators are affected by many uncertain factors, this indirect The method is not reliable; in addition, although the SBS content in the modified asphalt can be analyzed relatively simply and accurately by instruments such as infrared spectroscopy and nuclear magnetic resonance, these instruments and equipment are all expensive, usually in the hundreds of thousands or even millions. It is not suitable for popularization and application at the construction site. That is to say, there is no effective test method that can quickly and accurately detect the amount of SBS modifier in modified asphalt. Therefore, in order to implement effective quality management and monitoring, It is imminent to study a method to quickly and accurately test the content of SBS in modified asphalt

Method used

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  • Test method of doping quantity of modifier in SBS modified asphalt

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Sampling of SBS modified asphalt on a highway.

[0063] The unsaturation values ​​of SBS modified asphalt with SBS content of 1%, 2%, 3%, 4%, 5%, and 6% were measured, and they were 29.61, 31.75, 33.96, 35.57, 38.08, and 41.00 respectively; Using the same test procedure, the unsaturation value of the SBS modified asphalt sample to be tested is 36.83.

[0064] like figure 1 As shown, the known modifier content in the SBS modified asphalt samples of the above-mentioned measured content of each standard modifier is taken as the abscissa, and the degree of unsaturation corresponding to the modifier content is taken as the ordinate, and the Perform linear fitting to obtain the linear regression equation Y=A+BX, where Y is the degree of unsaturation (gI 2 / 100g), X is the modifier content (%) in SBS modified asphalt, where A=27.24, B=2.21571, correlation coefficient R 2 = 0.99657.

[0065] From the regression equation obtained above, it is calculated that the SBS conten...

Embodiment 2

[0067] Sampling at the construction site of the second SBS modified asphalt of a highway.

[0068] The unsaturation values ​​of SBS modified asphalt with SBS content of 1%, 2%, 3%, 4%, 5%, and 6% were measured, and they were 23.75, 25.33, 26.86, 28.58, 29.73, and 31.12 respectively; The unsaturation value of the SBS modified asphalt sample to be tested is 29.02.

[0069] like figure 2 As shown, the unsaturation corresponding to the samples with different SBS content measured above is taken as the ordinate, and the known SBS content is plotted as the abscissa, and a linear fit is performed to obtain the linear regression equation Y=A+BX , Y is the degree of unsaturation (gI 2 / 100g), X is the content of SBS (%), where A= 22.38467, B= 1.47914, correlation coefficient R 2 = 0.99851.

[0070] From the regression equation obtained above, it can be calculated that the SBS content in the asphalt sample to be tested is 4.49%, and the actual engineering requires that the SBS cont...

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Abstract

The invention belongs to the road engineering application field, and discloses a test method of doping quantity of a modifier in an SBS modified asphalt. The test method comprises the following steps: weighing SBS modified asphalt samples with the doping quantity of various standard modifiers, determining degree of unsaturation of the samples respectively, performing linear fit by the doping quantity of the modifiers of the SBS modified asphalt samples with the doping quantity of various standard modifiers and the determined degree of unsaturation, and establishing a mathematical model; and sampling at a construction site, and calculating the doping quantity of the modifier in the SBS modified asphalt to be tested according to the determined degree of unsaturation of the SBS modified asphalt to be tested. The test method of the invention is applicable to content detection of various SBS asphalt modifiers in the construction site environment, and plays a positive role of controlling quality of the SBS modified asphalt, ensuring pavement durability, preventing improper profit-making of a supplier, promoting market standardization and creating good social and economic benefits.

Description

technical field [0001] The invention belongs to the field of road engineering applications, and in particular relates to a method for testing the amount of modifier in SBS modified asphalt. The method of the invention can be used to detect the amount of modifier in SBS modified asphalt at the construction site. Background technique [0002] Asphalt pavement is widely used all over the world due to its advantages of low noise, good flatness and easy maintenance. In my country's high-grade highways, the proportion of asphalt pavement is about 80%, and with the continuous improvement and development of asphalt pavement technology, the proportion will become larger and larger. However, in actual engineering, asphalt pavement also has some shortcomings, the most prominent of which is high temperature sensitivity, flowing at high temperature and brittle at low temperature. In order to overcome the above-mentioned deficiencies of asphalt, modified asphalt has received widespread a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79
Inventor 宋家乐李炜光张榆张冬青戴征辛强孙己龙郜进良
Owner CHANGAN UNIV
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