Sample preparation method for fusion test of emulsified asphalt and old asphalt

A technology for emulsified asphalt and sample preparation, which is applied in the field of asphalt pavement regeneration, and can solve the problems of difficult preparation of emulsified asphalt and old asphalt

Pending Publication Date: 2021-12-24
NANJING FORESTRY UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a sample preparation method for the fusion test of emulsified asphalt and old asphalt, in order to solve the problem that it is difficult to prepare the fusion sample of emulsified asphalt and old asphalt in

Method used

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Embodiment Construction

[0011] The invention provides a sample preparation method for the fusion test of emulsified asphalt and old asphalt, and the specific implementation steps are as follows:

[0012] (1) According to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) in the rotary film oven test and pressure aging test, prepare long-term aging asphalt to replace the old asphalt, and make the internal length, width and height of 30mm Silicone mold;

[0013] (2) Heat a certain calculated amount of aged asphalt to 150°C and slowly pour it into a silicone mold. After cooling at room temperature, weigh the quality of the silicone mold containing aged asphalt as M 1 , and then take a certain amount of emulsified asphalt in proportion and slowly pour it into the same silica gel mold, and weigh the mass of the silica gel mold containing the fusion sample as M 2 ;

[0014] (3) Add sodium hydroxide powder accounting for 1% of the emulsified asphalt mass ratio to...

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Abstract

The invention relates to a sample preparation method for fusion test of emulsified asphalt and old asphalt, belongs to the technical field of asphalt pavement regeneration, and aims to solve the problem that a fused sample of emulsified asphalt and old asphalt is difficult to prepare. The method comprises the following steps that: aged asphalt is prepared to replace old asphalt according to specifications, the aged asphalt, emulsified asphalt and sodium hydroxide powder are sequentially poured into a silica gel mold, and the mass of the silica gel mold, obtained after each material is added, is weighed; the mass of the silica gel mold containing the fused sample is weighed at different heat preservation time nodes, the moisture mass loss in different time periods is calculated according to a formula, and when the mass loss is not larger than 0.8%, the corresponding heat preservation time is the time needed for effectively removing the moisture in the emulsified asphalt; and finally, the silica gel mold containing the fused sample is putted into a 0 DEG C high-low temperature test box, still standing is performed for 10 minutes, then demolding is performed, and the fused sample is cut and researched according to the size requirement of a microscopic test detection sample. The method is of great significance to application and popularization of the asphalt pavement cold recycling technology.

Description

technical field [0001] The invention relates to a sample preparation method for a fusion test of emulsified asphalt and old asphalt, and belongs to the technical field of asphalt pavement regeneration. Background technique [0002] In recent years, my country's highway construction has developed rapidly. As of the end of 2020, the total mileage of national expressways has reached 161,000 kilometers. The design life of asphalt pavement on high-grade highways is 15 years, but practice shows that after operation, many asphalt concrete pavements will enter a period of large-scale maintenance or renovation after 3 to 5 years as short as 6 to 9 years as long as long. In the process of asphalt pavement maintenance, renovation and upgrading, the waste of old asphalt pavement material resources is serious, and the environmental pollution caused by it is also intensifying. Asphalt pavement regeneration technology enables the reuse of waste asphalt mixture, saves a lot of asphalt and ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/36G01N5/04
CPCG01N1/286G01N1/36G01N5/045G01N2001/2873G01N2001/366
Inventor 许涛姚晓光王斯文
Owner NANJING FORESTRY UNIV
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