Method for designing mix proportion of AC-25 recycled asphalt mixture

A technology of AC-25 and mix ratio design, which is applied in the field of road engineering and construction, can solve the problems of insufficient performance of asphalt products and imperfect consideration of design factors, so as to save asphalt cost, optimize gradation design, and have good road performance Effect

Pending Publication Date: 2021-06-18
武汉综合交通研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, although there are some asphalt mixture design methods in the prior art, it is found in practice, especially in the design method of large-volume hot recycled mixture, that there are still imperfect considerations of design factors and optimization level. Insufficient performance of formulated asphalt products

Method used

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  • Method for designing mix proportion of AC-25 recycled asphalt mixture
  • Method for designing mix proportion of AC-25 recycled asphalt mixture
  • Method for designing mix proportion of AC-25 recycled asphalt mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The asphalt used in this test is SBS modified asphalt provided by Jiangsu Zhongchuang Transportation Material Co., Ltd., and the SMC regenerant sample is provided by Shanxi Junyi Intelligent Transportation Technology Co., Ltd. The optimum modifier dosage in this test is 12% of the SBS modified asphalt. The process used in the indoor production of SMC and SBS composite modified asphalt is implemented according to the group standard of China Highway Society "Technical Guidelines for Construction of SMC Modified Asphalt Pavement" (T / CHTS 10007-2019).

[0038] According to the gradation of the old materials and the pavement structure of the plant mixed heat regeneration structure layer as the lower layer, the selected mineral material gradation is AC-25C, the design gradation range requirements and the design gradation curve (synthetic gradation 1) See attached figure 1 . On the basis of ensuring the full use of the milling material as much as possible, a group of grades ...

Embodiment 2

[0047] According to the gradation of old materials and the pavement structure of the plant mix heat regeneration structure layer as the lower layer, the selected mineral material gradation is AC-25C, the design gradation range requirements and the design gradation curve (synthetic gradation 2) See attached figure 1 . On the basis of ensuring the full use of the milling material as much as possible, a group of grades was selected for the test, and the RAP dosage was still 45%.

[0048] Under the condition of determined ore grading composition, based on engineering practice experience, five different asphalt-asphalt ratios of 1.4%, 1.8%, 2.2%, 2.6% and 3.0% are finally determined, and the asphalt mixture is determined by Marshall method. For comparison, Marshall test blocks were prepared by compacting 75 times on both sides. The recycled material is heated to 130°C, the virgin material is heated to 155°C, the asphalt heating temperature is 155°C, the mixing temperature of the ...

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Abstract

The invention relates to an AC-25 recycled asphalt mixture mix proportion design method, which adopts the design method, optimizes, selects and screens the characteristics of raw materials, takes gradation design of RAP and other mixtures as the basis, comprehensively considers the influence of a plurality of factors when determining the asphalt-aggregate ratio, and uses a Marshall compaction experiment to determine the final asphalt-aggregate ratio. Finally, the asphalt mixture prepared by the design method is good in pavement performance, and the asphalt cost can be saved by 10%-20%. Meanwhile, the freeze-thaw splitting resistance and the tensile strength of the prepared asphalt mixture meet the index requirements of national test regulations.

Description

technical field [0001] The invention relates to the technical fields of construction and road engineering, in particular to a design method for the mixing ratio of AC-25 recycled asphalt mixture. Background technique [0002] Plant-mixed hot recycling technology has the advantages of easy control of regeneration process, better performance of recycled asphalt mixture, and wide application range. However, in the conventional mixing process, the difference between the new aggregate and the old material (coated with asphalt) is not taken into account, resulting in the difference between the new aggregate and the old material coated with asphalt in the recycled mixture after mixing. The uniformity of the mixture is poor, and the new aggregate with large particle size is often not fully coated with asphalt after mixing, and the phenomenon of graying material appears. In order to control the occurrence of graying material, sometimes the addition of new asphalt has to be increased...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2111/0075C04B2111/00198C04B2201/20C04B2201/50C04B18/20C04B18/141C04B14/02C04B2103/0068
Inventor 胡伟陈涛李雄刘明辉贺毅吴忠华周琛王军丽黄登科叶浩谭卫平赵站伟严家红霍红杰杨隆义
Owner 武汉综合交通研究院有限公司
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