Indoor aging method of rubber powder modified asphalt under joint effect of heat, oxygen and water

A technology for modifying asphalt and rubber powder, applied in the field of transportation engineering, can solve the problems of aggravated asphalt aging, changes in rainwater quality, affecting the long-term use function of asphalt, etc., and achieves the effect of improving the quality of the road surface and prolonging the service life.

Active Publication Date: 2012-09-19
YANGZHOU UNIV
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AI Technical Summary

Problems solved by technology

Zhang Qian pointed out that sulfuric acid will cause changes in the water quality of rainwater in the analysis of the chemical mechanism of acid rain corrosion of mineral materials in asphalt mixtures, resulting in aggravated asphalt aging
It is worth noting that when there is landing oil, snow melting agent, etc. on the asphalt pavement, it will also cause changes in the water quality of rainwater, affect the long-term use of asphalt, and cause asphalt to age
Due to the uncertainty and complexity of various environmental factors in hot oxygen water, different pH values ​​of water, and the relationship between chloride content and asphalt, there is currently no method that can completely and truly simulate the aging process of asphalt.

Method used

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  • Indoor aging method of rubber powder modified asphalt under joint effect of heat, oxygen and water
  • Indoor aging method of rubber powder modified asphalt under joint effect of heat, oxygen and water

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Experimental program
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Embodiment 1

[0018] The indoor aging method of rubber powder modified asphalt under the combined action of hot oxygen water comprises the following steps:

[0019] (1) Determining the pH value and chlorine salt concentration of water: According to the actual precipitation in various regions of China, the average pH range of rainwater is determined to be 3.5-7.5, and the pH value is divided into five levels: 3.5, 4.5, 5.5, 6.5, 7.5; Combined with the chlorine salt content of seawater in various coastal areas and the use of deicing salt in northern regions, the mass concentration range of salt water is determined to be 0-3.5%, and the chlorine salt content is divided into 4 grades: 0, 1.5%, 2.5%, 3.5%, if it corresponds to the actual situation in a certain place, it is necessary to combine the rainwater with a certain level of PH value and the saline solution with a certain level of chlorine salt content for hot oxygen water aging;

[0020] (2) Sample preparation: Pour the melted rubber powd...

Embodiment 2

[0025] Indoor aging method of rubber powder modified asphalt under the combination of hot oxygen and water:

[0026] 1. Pour 50g of rubber powder-modified asphalt that has just been prepared or heated to a fluid state into a stainless steel flat-bottomed disc with a diameter of 140mm×9.5mm. The film thickness is about 3.2mm. Make four sample discs for each batch.

[0027] 2. Open the film oven, and after the oven reaches the test temperature of 163±1°C, quickly put 4 sample dishes on the turntable in the oven, close the oven door and start the turntable rack, so that the turntable is on the horizontal plane at a distance of 5.5±1r Rotate at a speed of 1 / min, the temperature in the oven rises to the test temperature and start timing, and the aging time is 5h.

[0028] 3. Determination of PH value and chlorine salt concentration of water. The water quality in various places is different, and the value of the pH value of rainwater is also correspondingly different, consults the ...

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Abstract

The invention discloses an indoor aging method of rubber powder modified asphalt under joint effect of heat, oxygen and water. The method comprises the following steps of: (1) determining the pH value and the chloride concentration of the water; (2) sample preparation: pouring the molten rubber powder modified asphalt into a stainless steel flat-bottom disc; (3) short-term heat aging: aging in the asphalt test by use of a film oven; and (4) heat oxygen water aging: dividing the aging process into two stages: heat-oxygen-water aging and heat-oxygen aging. The method disclosed by the invention accurately reflects the change rules of the aging indexes of the rubber powder modified asphalt under the joint effect of multiple factors including heat, oxygen and water to obtain the heat-oxygen-water aging characteristics of the rubber powder modified asphalt, thus providing reference for the laboratory simulation of the rubber powder asphalt under the joint effect of heat, oxygen and water, providing theoretical basis and technical support for improving the road surface using quality of the rubber powder modified asphalt material and prolonging the service life, and also establishing a firm foundation for the development and application of the new material of rubber powder modified asphalt.

Description

technical field [0001] The invention relates to an aging test method of rubber powder modified asphalt under the combined action of hot oxygen and water, which can accurately reflect the change rule of the aging index of rubber powder modified asphalt under the combined action of hot oxygen and water, and obtain the performance of rubber powder modified asphalt Aging characteristics belong to the field of transportation engineering. Background technique [0002] The asphalt pavement design life of my country's high-grade highways is generally 15 years. With the increase in traffic volume and the combined effect of environmental factors, in fact, large-scale repairs and maintenance will be required 5 to 8 years after completion. However, the construction and maintenance of high-grade highways are faced with The double problem of lack of funds and resources. Therefore, how to improve the anti-aging performance of domestic asphalt and prolong the service life of asphalt pavemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N1/28
Inventor 肖鹏康爱红吴美平蒋德安
Owner YANGZHOU UNIV
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