Method for designing mix proportion of hot recycled asphalt mixture based on performance requirements

A design technology of asphalt mixture and mix ratio, which is applied in the direction of computer material science, computer combined chemistry, instruments, etc., can solve the problems affecting the scale of asphalt mortar, research, and the actual performance of asphalt mixture

Active Publication Date: 2021-07-27
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, some scholars have conducted research on asphalt mortar and found that asphalt mortar will significantly affect the actual performance of asphalt mixture on the road.
Up to now, there are still no clear requirements for the composition and performance of asphalt mortar in relevant specifications, and there is no clear grading design method for thermally recycled asphalt mortar, which seriously affects the research on the scale of asphalt mortar

Method used

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  • Method for designing mix proportion of hot recycled asphalt mixture based on performance requirements
  • Method for designing mix proportion of hot recycled asphalt mixture based on performance requirements
  • Method for designing mix proportion of hot recycled asphalt mixture based on performance requirements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Raw material performance test

[0047] The extraction test was carried out on the old RAP material obtained by milling the old road surface in this example, and the sieve pass rate and the initial asphalt ratio of the old RAP material were obtained, as shown in Table 1.

[0048] Table 1

[0049]

[0050] Carry out raw material screening and density test on new mineral materials, and obtain basic parameters such as sieve pass rate, apparent relative density and gross volume relative density of materials 1# to 4# and mineral powder, as shown in Table 2 and Table 3.

[0051] Table 2 Mineral Material Screening Results

[0052]

[0053] Table 3 Summary of density test results

[0054]

[0055] Asphalt recovery and regenerant addition test

[0056] 0%, 3%, 5% and 8% of the old asphalt were added to the old asphalt extracted from the old RAP material, and the three indicators were tested respectively. See Table 4 for the test results.

[0057] Table 4

[0058]

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Abstract

The invention discloses a thermal regeneration asphalt mixture mix proportion design method based on performance requirements, and the method comprises the following steps: testing various performance indexes of RAP old materials and new mineral aggregates; designing the mix proportion of the RAP old material and the new mineral material, and performing a Marshall test according to a preset initial test synthetic asphalt-aggregate ratio to determine the optimal gradation; carrying out marshall tests under different asphalt-aggregate ratios on the determined optimal gradation, and determining the optimal asphalt-aggregate ratio; according to the optimal gradation and the optimal asphalt-aggregate ratio, calculating and determining the optimal asphalt film thickness under the optimal asphalt-aggregate ratio through a specific surface area method; determining the synthetic oil-sand ratio of the hot recycled asphalt mortar according to the optimal asphalt film thickness, and calculating the amount of newly added asphalt required to be added so as to obtain the mix proportion of the recycled asphalt mortar. According to the design method disclosed by the invention, the relevance among the hot recycled asphalt mortar, the hot recycled asphalt mortar and the hot recycled asphalt mixture can be obviously reflected.

Description

technical field [0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a method for designing the mixing ratio of hot recycled asphalt mixture based on performance requirements. Background technique [0002] With the substantial increase of road maintenance mileage in my country every year, the amount of waste pavement materials has also increased simultaneously, and a large amount of waste pavement materials has caused a great burden on the economy and the environment. At present, the country has clear requirements for the recycling of pavement materials, so more and more old RAP materials are used in road surface regeneration and maintenance projects, and the use of hot recycled asphalt mixture is becoming more and more popular. However, hot recycled asphalt mixture contains new and old aggregates and new and old asphalt. Compared with ordinary asphalt mixture, its composition is more complex. Therefore, for thermal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/60G16C60/00
CPCG16C20/60G16C60/00
Inventor 吴宇浩张垚肖鹏康爱红顾倩俪王业陈虎吴红辉
Owner YANGZHOU UNIV
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