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Asphalt for ultrathin surface wearing layer and mixture and application thereof

A technology of asphalt mixture and wear layer, which is applied in the direction of building insulation materials, building components, buildings, etc., can solve the problems of rapid attenuation of drainage performance and noise reduction effect, high cost, and excessive size, so as to avoid excessive attenuation of surface functions Fast and too large, improve the surface function, the effect of large connected void ratio

Active Publication Date: 2013-09-25
BEIJING TONGHUA ROAD MAINTENANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The technical problem solved by the present invention is that in the existing ultra-thin wear layer technology, the structural depth, drainage performance and noise reduction effect are too fast and too large; and the cost of the existing technology is too high.

Method used

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  • Asphalt for ultrathin surface wearing layer and mixture and application thereof
  • Asphalt for ultrathin surface wearing layer and mixture and application thereof
  • Asphalt for ultrathin surface wearing layer and mixture and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Heat 90 parts of heavy-duty 70# asphalt to 160°C to make it fluid and ready for use. Add 3 parts of dispersing aid solvent N-methylpyrrolidone to extract the oil, and 3 parts of styrene-butadiene rubber powder into the molten asphalt in sequence, and stir for 2 hours. Add 3 parts of ethylene methyl acrylate copolymer to the bitumen and stir for 30 minutes to ensure complete melt dispersion. Add 0.02 parts of polyphosphoric acid, continue to stir and react for 2 hours, and obtain finished asphalt. The performance index of the finished modified asphalt is shown in Table 3.

[0046] Table 3 Performance index of modified asphalt for mixture

[0047]

[0048] In this case, the design thickness of the mixture is 1.5cm, using 5-8mm basalt, 0-3mm limestone machine-made sand, and limestone mineral powder.

[0049] See Table 4 for the screening results of stone and mineral powder, and see Tables 5 and 6 for the test results of aggregate performance.

[0050] Table 4 aggrega...

Embodiment 2

[0066] Heat 94 parts of SBS modified I-B asphalt to 165 degrees Celsius to make it fluid for later use, add 1.0 parts of N-methylpyrrolidone and 1.0 parts of furfural as dispersing co-solvents to extract oil, and add 2 parts of styrene-butadiene rubber powder to the molten asphalt at one time , and stirred for 2 hours. Add 2.5 parts of ethylene methyl acrylate copolymer to the asphalt and stir for 3.5 hours to obtain finished asphalt. The performance indicators of the finished modified asphalt are shown in Table 10.

[0067] Table 10 Performance indicators of modified asphalt for mixture

[0068]

[0069] The design thickness of the mixture in this case is 1.2cm, using 5-8mm basalt, 0-3mm limestone machine-made sand, and limestone slag.

[0070] See Table 11 for the screening results of stone and mineral powder, and see Tables 12 and 13 for the test results of aggregate performance.

[0071] Table 11 aggregate screening results

[0072]

[0073] Table 12 Coarse aggreg...

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Abstract

The invention relates to an asphalt for an ultrathin surface wearing layer, which comprises 90-96 weight parts of heavy-traffic or conventional modified asphalt and is added with a compound agent, wherein the compound agent consists of the following components in parts by weight: 2-3 parts of polymer, 1-3 parts of rubber and 1.5-3 parts of dispersing aid; and the mixture improves the viscosity and stiffness of asphalt as well as the adhesive force between asphalt and stone, and avoids or reduces the phenomenon that the asphalt floats upward and blocks gaps and consequently causes reduction of the structure depth, drainage performance and denoising effect of the mixture under the action of temperature and traffic load. The invention also discloses a mixture of the asphalt; by adding a grading control point to the mixture and matching the broken grade and the open grade, a stable skeleton embedding extrusion structure and the maximum skeleton gap are obtained, and higher porosity and maximum connection porosity are obtained so as to avoid skeleton instability and consequent surface function attenuation. The invention also discloses an application method of the mixture at the same time.

Description

technical field [0001] The invention belongs to the field of road pavement materials, and in particular relates to asphalt used for hot-mixing and hot-laying an extremely thin surface wear layer, a mixture of the asphalt, and its use. Background technique [0002] Since the beginning of the 21st century, many expressways built in the early stages of our country have entered the stage of major and medium repairs, and the international exchange of maintenance-related concepts and technologies has become increasingly frequent, and the gradual introduction of large-scale maintenance equipment has prompted road maintenance, especially expressways. Conservation has entered a new and complicated stage. The concept of preventive maintenance and related technologies have gradually been understood and accepted by the majority of road engineering technicians, and different degrees of attempts have been made in various regions of the country, and certain practical effects have been achi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L9/06C08L7/00C08L23/08C04B26/26
Inventor 石红星陈智杰廖卫东陆山风焦朋朋秦鹏勋张伟董月振
Owner BEIJING TONGHUA ROAD MAINTENANCE
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