Method for measuring SBS content in SBS modified asphalts by virtue of DSR

A modified asphalt and content technology, applied in the field of SBS content, can solve the problems of great influence of human factors, affecting the accuracy of test results, slow titration reaction, etc., achieving strong automatic control ability of the instrument, accurate and reliable test results, and strengthening quality control. Effect

Active Publication Date: 2015-07-15
厦门华特公路沥青技术有限公司
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Problems solved by technology

Generally, the detection institutions in the transportation industry basically do not have the instruments and equipment used for infrared spectroscopy and GPC determination, and it is difficult to have relevant detection conditions; although the potentiometric titration method has sim

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  • Method for measuring SBS content in SBS modified asphalts by virtue of DSR
  • Method for measuring SBS content in SBS modified asphalts by virtue of DSR
  • Method for measuring SBS content in SBS modified asphalts by virtue of DSR

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Embodiment Construction

[0027] Some examples of the present invention are provided below to help further understanding of the present invention, but the protection scope of the present invention is not limited to these examples.

[0028] The invention discloses a method for measuring SBS content in SBS modified asphalt by using DSR, which is carried out according to the following steps:

[0029] (1) Take ESSO (Esso) No. 70 asphalt to configure SBS content of 0%, 1.0%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5%, 6.0% Standard concentration SBS modified asphalt;

[0030] (2) RTFOT aging test: the rotating film oven test (RTFOT) for simulating asphalt mixing and aging for this series of standard concentration SBS modified asphalt;

[0031] (3) Repeated creep recovery test: Take the above RTFOT aging samples and use a dynamic shear rheometer to perform repeated creep recovery tests at 70°C and 3.2KPa stress respectively. The 3.2KPa stress is loaded for 1s for creep and unloaded to zero stress Carry...

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Abstract

The invention discloses a method for measuring an SBS content in SBS modified asphalts by virtue of a dynamic shear rheometer (DSR). The method is carried out according to the following steps: configuring a series of modified asphalts with different SBS admixture amounts and a standard SBS content, and carrying out an RTFOT ageing experiment; then carrying out a repeated creep recovery experiment by virtue of the DSR to form a creep recovery graph; calculating the average value Jnr@sigma of a plurality of circulating unrecoverable creep compliances of the modified asphalt RTFOT ageing samples with the various SBS admixture amounts, and the average value Rec@sigma of elastic recovery rates; drawing a Jnr@sigma content curve and a Rec@sigma-SBS content curve; carrying out the RTFOT ageing experiment and the repeated creep recovery experiment on the SBS content to be measured to obtain the unrecoverable creep compliances Jnr@sigma and the elastic recovery rates Rec@sigma of the test samples; and reading the SBS contents CJ and CR on the content curves, wherein the SBS content of the test samples is (CJ+CR)/2. The method is simple to operate, high in applicability, and accurate and reliable in test result.

Description

technical field [0001] The invention relates to the technical field of asphalt, in particular to a method for measuring the SBS content in SBS modified asphalt by using DSR. Background technique [0002] In recent years, in the construction of highway asphalt pavement in my country, the proportion of modified asphalt pavement continues to increase. Compared with other modifiers (such as PE, EVA, SBR, etc.), SBS has obvious advantages in improving high and low temperature performance, elastic recovery ability, temperature sensitivity, etc. Mainly modified asphalt. With the in-depth research on modified asphalt at home and abroad, a large number of research results have been obtained on the modification mechanism, modification process, material influencing factors, and road performance of SBS modified asphalt. However, the conventional indicators of SBS modified asphalt (penetration, softening point, ductility, etc.) cannot characterize or reflect the content of modifier SBS...

Claims

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Application Information

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IPC IPC(8): G01N33/42
Inventor 蔡智慧马云容胥亮蓝志杰康君杰周少聪袁宝兰吴清芳陈凯玉朱明陈明杰
Owner 厦门华特公路沥青技术有限公司
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