Determination method of sbs content in sbs modified asphalt

A technology of modified asphalt and determination method, which is applied in the direction of removing a certain component and weighing, etc., can solve the problems of deviation, unsuitability for popularization, insufficient identification, etc., and achieves the effect of low cost and fast and convenient detection scheme.

Inactive Publication Date: 2019-09-03
XIAN HIGHWAY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing methods not only have deficiencies in the accuracy or the recognition degree at the end of the test, but also have different matrix asphalt components, different SBS structures, and different blending mechanisms of SBS and matrix asphalt. There is a large deviation in the determination of SBS content in permanent asphalt, and the equipment is expensive, so it is not suitable for popularization and use on the construction site

Method used

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  • Determination method of sbs content in sbs modified asphalt

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preparation example Construction

[0060] The preparation method of the above-mentioned special separation solvent is as follows: stir the asphalt dissolved component and the balance component evenly, then add additives, and finally add the SBS protection component, and stir the mixture evenly.

[0061] In the present invention, the preparation method of the SBS modified asphalt sample sheet is as follows: heat and melt the SBS modified asphalt and pour it on a clean silicone rubber plate, and use a hot scraper to smear the modified asphalt when the modified asphalt has fluidity Form a film; after the modified asphalt is completely cooled, the modified asphalt film is peeled off from the silicone rubber plate and cut into rectangular sheets with scissors.

Embodiment 1

[0062] Embodiment 1: Determining the content of SBS modifier at a certain expressway construction site in Qinghai Province.

[0063] (1) Take 90# matrix asphalt and modifier SBS at the project site respectively, and prepare SBS with SBS content of 1%, 2%, 3%, 4%, and 5% according to the SBS modified asphalt configuration method of the expressway Modified asphalt samples;

[0064] (2) Calibrate the content of the SBS protective component in the special separating agent according to the following steps.

[0065] ①Heat the modified asphalt with 5% SBS content to 180°C, then pour the modified asphalt on the silicone rubber plate, apply the modified asphalt into a film with a hot scraper, and lift it off with tweezers after the modified asphalt is cooled , and then cut the modified asphalt film into 2cm×1cm slices with scissors;

[0066] ② Weigh 55 parts of kerosene and 3 parts of methyl acetate and stir evenly, add 10 parts of ethanol and 1 part of modified branched chain alcoho...

Embodiment 2

[0074] Embodiment 2: Determining the content of SBS modifier on a highway construction site in Shaanxi Province.

[0075] (1) Take 70# matrix asphalt and modifier SBS from the project site respectively, and prepare SBS with SBS content of 1%, 2%, 3%, 4%, and 5% according to the SBS modified asphalt configuration method of the expressway Modified asphalt samples;

[0076] (2) Calibrate the content of the SBS protective component in the special separating agent according to the following steps.

[0077] ①Heat the modified asphalt with 4% SBS content to 180°C, then pour the modified asphalt on the silicone rubber plate, apply the modified asphalt into a film with a hot scraper, and lift it off with tweezers after the modified asphalt is cooled , and then cut the modified asphalt film into 2cm×1cm slices with scissors;

[0078] ② Weigh 60 parts of toluene and 5 parts of ethyl acetate and stir evenly, add 15 parts of isopropanol and 1 part of fatty alcohol polyoxyethylene ether s...

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Abstract

The invention relates to a method for measuring the content of SBS in SBS modified asphalt. The method comprises the following steps: preparing a series of standard SBS content modified asphalts with different dosages of SBS series; using the standard SBS content modified asphalts to determine the content of SBS protection components in a special separating agent; preparing SBS modified asphalt sample sheets; placing SBS modified asphalt sheets to be tested in a special separation solvent for ultrasonic oscillation and dissolution at room temperature; filtering a sample solution with quantitative filter paper; drying and cooling a conical flask and then weighing; placing the filter paper and residues into an asphaltene extractor; using the SBS protection components for reflux extraction; drying and cooling the filter paper and the residues and then weighing; and calculating the content of SBS in the sample. The method provided by the invention hast the advantages of separating SBS and the asphalt by means of difference in solubility and distribution coefficient of the SBS and the asphalt in the same solvent, using the special separating agents different in component content for different kinds of asphalts and SBS modifiers, and obtaining accurate and reliable test results.

Description

technical field [0001] The invention relates to the field of road engineering applications, in particular to a method for measuring SBS content in SBS modified asphalt. Background technique [0002] As a widely used road engineering material, asphalt provides essential performance for the long-term normal use of road surfaces. However, due to the characteristics of asphalt's own structure, it is more sensitive to factors such as temperature and load. Using certain technical means to blend the base asphalt with the modifier SBS can obviously make up for its many performance defects. Due to the current high market price of SBS modifier, there is no clear and effective method to detect the SBS content in modified asphalt in China, prompting some manufacturers to reduce the SBS modifier without permission in the process of producing SBS modified asphalt in order to save costs. The amount makes the performance of the actually produced SBS modified asphalt poor. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
Inventor 弥海晨郭平韩瑞民李艳郭彦强张娟徐鹏马庆伟弓锐
Owner XIAN HIGHWAY INST
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