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Emulsified asphalt cold in-place recycling mixture as well as grading method and application thereof

A technology for cold recycled mixture and emulsified asphalt, which is used in construction, road, road repair and other directions, can solve the problem of difficulty in obtaining in-situ cold recycled mixture with excellent road performance, and the uneven road performance of cold recycled mixture. Unreasonable grading design and other problems to achieve the effect of excellent road performance

Active Publication Date: 2018-09-07
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the amount of new aggregate in the above method is determined by experience, which leads to the need to adjust the amount of new aggregate several times according to the milling thickness and actual compaction thickness of the road surface in the field test section in specific applications. The process is not only complicated, but also Also affect the progress of the project
In addition, the in-situ cold recycled mixture obtained by the above method has unreasonable gradation design between new aggregates, and the road performance of the obtained in-situ cold recycled mixture is uneven, and it is difficult to obtain an in-situ cold recycled mixture with excellent road performance. cold recycled mix

Method used

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preparation example Construction

[0031] The present invention has no special requirements on the type of emulsified asphalt, and the type of emulsified asphalt known to those skilled in the art can be used. In a specific embodiment of the present invention, the emulsified asphalt is preferably SBR modified emulsified asphalt. In the present invention, the preparation method of the SBR modified emulsified asphalt preferably includes: emulsifying the asphalt with an SBR latex modifier to obtain the SBR modified emulsified asphalt.

[0032] In the present invention, the emulsified asphalt serves to bond the raw materials of each component into a whole, increase the strength and enhance the road surface's ability to resist driving damage, and make the road surface stable.

[0033] In the present invention, based on the mass parts of the emulsified asphalt, the total parts of the old road milling material and the aggregate are 100 parts, and the type and mass parts of the aggregate are based on the value of a in f...

Embodiment 1

[0055] Taking the milling thickness of the old pavement as 10cm and the design thickness of the cold recycled structural layer as 18cm as an example, the coefficient Y of the new aggregate content is obtained through calculation, and the coefficient of the new aggregate content is 1.575. Then the mass parts of coarse aggregate and fine aggregate are determined by the formula (Y-1) / Y×100. Through calculation, it can be seen that (Y-1) / Y×100=36.5>35, and then it can be obtained that the mass fraction of fine aggregate is 20 parts, the mass fraction of coarse aggregate is 16.5 parts, and the old road surface milling material is 63.5 parts. 1.5 parts by mass of cement, 4.0 parts by mass of emulsified asphalt and 4.0 parts by mass of water. Among them, the particle size of the coarse aggregate is 15-30 mm, the apparent relative density of the coarse aggregate is 2.6, the needle flake content of the coarse aggregate is 20%, and the crushing value of the coarse aggregate is 26%; The...

Embodiment 2

[0057] Taking the milling thickness of the old pavement as 12cm and the design thickness of the cold recycled structural layer as 18cm as an example, the new aggregate addition coefficient Y is obtained through calculation, and the new aggregate addition coefficient is 1.3125. Then the mass parts of coarse aggregate and fine aggregate are determined by the formula (Y-1) / Y×100. Through calculation, it can be seen that (Y-1) / Y×100=24 0.3mm in the fine aggregate is 15%, the angularity of the fine aggregate is 32s; the strength grade of the cement is 42.5 , The initial setting time of cement is 4h, the final setting time is 7h, and the appearance of cement has no agglomeration.

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Abstract

The invention provides a grading method of an emulsified asphalt cold in-place recycling mixture. The emulsified asphalt cold in-place recycling mixture is prepared from emulsified asphalt, an old pavement milling material, aggregate, cement and water; a new aggregate doping amount is determined according to the thickness of a cold recycling structure and a old pavement milling thickness; meanwhile, the grading of the emulsified asphalt, coarse aggregate, fine aggregate, the cement and the water in novel aggregate is controlled, so that the emulsified asphalt cold in-place recycling mixture provided by the invention has good pavement performance. Meanwhile, the invention provides the emulsified asphalt cold in-place recycling mixture obtained by the grading method and application of the emulsified asphalt cold in-place recycling mixture to old pavement repairing and modification.

Description

technical field [0001] The invention relates to the technical field of application of traffic civil engineering, in particular to an emulsified asphalt in-situ cold recycled mixture and its grading method and application. Background technique [0002] In-situ cold recycling refers to the road construction technology that uses asphalt recycling equipment to crush old asphalt pavement materials on the spot, add new aggregates, mix and compact them, and use old pavement materials as the main material. Cold-in-place recycled mixture refers to a mixture including old road milling material and new aggregate, and emulsified asphalt cold-in-place recycled mixture refers to an in-situ cold recycled mixture including emulsified asphalt. [0003] At present, the design method of in-situ cold recycled mixture in engineering practice is mainly: first determine the density of in-situ cold recycled mixture, and then determine the amount of new aggregate according to this density, and then ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/08C04B28/02C04B20/00E01C19/10
CPCC04B20/0088C04B20/0096C04B28/021C04B28/04C04B28/08C04B2111/0075C04B2201/50E01C19/1054C04B24/36C04B18/16C04B22/002C04B14/02
Inventor 蒋应军王翰越易勇陈浙江胡永林李寿伟
Owner CHANGAN UNIV
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