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Asphalt apparent viscosity testing method based on dynamic shear rheometer

A technology of apparent viscosity and testing method, which is applied in the direction of instruments, flow characteristics, measuring devices, etc., and can solve problems such as inability to test asphalt, deviation of viscosity-temperature characteristics, etc.

Inactive Publication Date: 2021-05-07
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for testing the apparent viscosity of asphalt based on a dynamic shear rheometer, which can solve the problem that the traditional Brookfield rotational viscosity test method is difficult to actively control the shear rate during the asphalt viscosity-temperature curve test process, resulting in This method cannot test the asphalt with shear rate dependent characteristics according to a specific shear rate, which eventually leads to a series of asphalt performance tests based on the viscosity-temperature curve, such as construction temperature prediction, viscosity-temperature characteristic test, etc. There are major deviations The problem

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  • Asphalt apparent viscosity testing method based on dynamic shear rheometer
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  • Asphalt apparent viscosity testing method based on dynamic shear rheometer

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Embodiment 1

[0084] The present invention provides a method for testing the apparent viscosity of asphalt based on a dynamic shear rheometer. The viscosity-temperature curves of common matrix asphalt 70# and 110# are measured by the dynamic shear rheometer after establishing the above-mentioned temperature change method. , and to determine its mixing and compaction temperature, the test results will be compared with the results obtained by the traditional Brookfield rotational viscosity test method. Wherein measuring viscosity-temperature curve comprises the following steps:

[0085] 1. Heat the asphalt to be tested, and use a metal test mold to pour the asphalt to be tested into a flat cylindrical asphalt specimen with a height of H = 1mm and a diameter of D = 25mm; at the same time, enter the start-up process of the dynamic shear rheometer. After calibration, set The installation temperature of the test piece is 60°C;

[0086] 2. Put the asphalt test piece into the dynamic shear rheomet...

Embodiment 2

[0108] The invention provides a method for testing the apparent viscosity of asphalt based on a dynamic shear rheometer, which measures the viscosity-temperature curves of modified asphalt SBS and SBR through the dynamic shear rheometer after the above-mentioned establishment of the temperature change mode and system, and Based on this, the mixing and compaction temperature is determined, and the test results will be compared with those obtained by the traditional Brookfield rotational viscosity test method. Wherein measuring viscosity-temperature curve comprises the following steps:

[0109] 1. Heat the asphalt to be tested, and use a metal test mold to pour the asphalt to be tested into a flat cylindrical asphalt specimen with a height of H = 1mm and a diameter of D = 25mm; at the same time, enter the start-up process of the dynamic shear rheometer. After calibration, set The installation temperature of the test piece is 60°C;

[0110]2. Put the asphalt test piece into the ...

Embodiment 3

[0132] The present invention provides a method for testing the apparent viscosity of asphalt based on a dynamic shear rheometer, through the establishment of the above-mentioned temperature change mode and the dynamic shear rheometer after the system to measure and determine SBS modified asphalt adding 4 types of common warm mix agents (an external additive specially used to reduce the construction temperature of asphalt by 15-30°C to meet the environmental protection requirements of construction) before and after the viscosity-temperature curve and its mixing and compaction temperature changes, and the test results were compared with the traditional Brookfield rotational viscosity test method to obtain results for comparison. Wherein measuring viscosity-temperature curve comprises the following steps:

[0133] 1. Heat the asphalt to be tested, and use a metal test mold to pour the asphalt to be tested into a flat cylindrical asphalt specimen with a height of H = 1mm and a dia...

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Abstract

The invention discloses an asphalt apparent viscosity testing method based on a dynamic shear rheometer. The comprises three stages, namely an experiment preparation stage, an operation testing stage and a data processing stage. According to the three stages, firstly, a temperature change mode and shear rate system of tested asphalt through three stages is established, a program code on a dynamic shear rheometer is set, and controllable test is carried out on various data of the asphalt by starting the program code. Due to the fact that the dynamic shear rheometer can achieve active temperature change and active rotating speed (shear rate) change in the viscosity testing process through programming, viscosity-temperature scanning curve testing of asphalt viscosity along temperature change at the fixed shear rate can be achieved on the basis of the method; a viscosity-shear rate scanning curve of asphalt viscosity changes along the shear rate at a fixed temperature; and the viscosity-temperature-shearing rate comprehensive scanning of the asphalt viscosity changing along the temperature and the shearing rate is comprehensive.

Description

technical field [0001] The invention relates to the technical field of asphalt viscosity testing, in particular to an asphalt apparent viscosity testing method based on a dynamic shear rheometer. Background technique [0002] In road engineering construction, to determine the construction temperature (mixing and compaction temperature) of asphalt concrete, it is necessary to measure the asphalt viscosity-temperature curve in the range of 135-175°C. In this temperature range, the viscosity of asphalt is usually 10-1-102Pa· change within s. [0003] The currently commonly used asphalt viscosity test method - the Brookfield rotational viscosity test method is limited by the test principle. During the viscosity-temperature curve test process, it is necessary to constantly change the rotor and speed collocation used to meet the ever-changing test accuracy and range requirements. As a result, this method cannot actively control the shear rate when performing the asphalt viscosity...

Claims

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Application Information

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IPC IPC(8): G01N11/16
CPCG01N11/162
Inventor 罗浩原邱延峻艾长发丁海波阳恩慧
Owner SOUTHWEST JIAOTONG UNIV
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