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Preparation method of high-performance warm-mix regenerated asphalt mixture

A technology for asphalt mixture and recycled asphalt, which is used in climate change adaptation, roads, road repair, etc., can solve the problems of low strength of recycled mixture, reduced water stability of mixture, and high cost, saving fuel and exhaust emissions, The effect of saving stone and asphalt, saving resources and cost

Inactive Publication Date: 2014-02-05
云南省公路科学技术研究院
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: All new aggregates and new asphalt are mixed under the condition of 165 ℃ ~ 175 ℃, which requires a large amount of resources and high cost
Disadvantage: The utilization rate of RAP is low, only 10% to 30%
Disadvantages: special equipment is required, and the cost of equipment is high; the strength of recycled mixture is low, the road performance is worse than that of conventional hot mix asphalt mixture, water stability is poor, and the scope of application is limited. It is generally used for the base layer and lower layer of road surfaces in dry and rainless areas
Disadvantages: the cost of this technology is high, and the water stability of the mixture is lower than that of conventional hot mix asphalt mixture
Disadvantages: This technology only modifies the fresh asphalt mixture and does not utilize RAP

Method used

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  • Preparation method of high-performance warm-mix regenerated asphalt mixture
  • Preparation method of high-performance warm-mix regenerated asphalt mixture
  • Preparation method of high-performance warm-mix regenerated asphalt mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example

[0028] 1) Extract and screen the old asphalt mixture, determine the gradation and asphalt content of the mixture, and conduct three index tests on the asphalt to evaluate the performance indicators of the old asphalt in RAP.

[0029]

[0030] Three major indicators of asphalt:

[0031] Asphalt penetration: 22 (0.1mm), softening point: 58°C, ductility 7cm at 15°C.

[0032] 2) Adjust the mixture gradation

[0033] The target mixture gradation prepared with AC-20 gradation requires 9% of 13.2-16mm aggregate and 10% of 16-19mm aggregate. The blending results are shown in the table below:

[0034]

[0035]

[0036] 3) According to the economic index analysis of the project, the ratio of RAP dosage is determined to be 60%.

[0037] 4) According to Marshall's "5-point method" of conventional asphalt mixture, determine the optimal amount of new asphalt added to the asphalt mixture (OAC n ) is 2.0%.

[0038] 5) The amount of sulfur additive added is 1% of the mass of the ...

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Abstract

The invention discloses a preparation method of a high-performance warm-mix regenerated asphalt mixture, which comprises the following steps: extracting and screening an old asphalt mixture, determining the size distribution and asphalt content of the mixture, carrying out three-main-index testing on the asphalt, and evaluating old asphalt performance indexes in RAP; determining the doping proportion of the RAP according to the performance indexes of the asphalt in the RAP, wherein the doping proportion is generally 50-100%, and the doping proportion can be higher as the performance indexes of the asphalt in the RAP are higher; determining the optimal doped new asphalt consumption (OACn) of the asphalt mixture by a conventional asphalt mixture Marshall five-point process; and after calculating the doped new asphalt consumption, detecting according to according to the performance indexes specified in Asphalt Pavement Construction Technique Specifications (JTGF40-2004) by a testing method specified in Highway Engineering Asphalt and Asphalt Mixture Test Specifications (JTGE20-2011).

Description

technical field [0001] The invention relates to the field of road traffic, in particular to a method for manufacturing high-performance warm-mix recycled asphalt mixture. Background technique [0002] In asphalt pavement asphalt mixture technology, there are currently five methods involving asphalt concrete, RAP recycling, and warm mixing technology. [0003] The first technology uses all new aggregates and new asphalt. The asphalt mixing plant is used to heat the asphalt temperature and the aggregate temperature to 165 ° C ~ 175 ° C and mix evenly. A uniform asphalt film is formed on the surface of the aggregate. Under the action of the asphalt binder Create structural strength. There is no recycling of RAP involved. Disadvantages: All new aggregates and new asphalt are mixed at 165°C to 175°C, which requires a large amount of resources and high cost. [0004] The second technology uses 10% to 30% RAP, and also uses an asphalt mixing plant to heat the asphalt temperature...

Claims

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Application Information

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IPC IPC(8): E01C19/10
CPCY02A30/30
Inventor 周彬贾敬鹏严世祥任建赵小洁房刚
Owner 云南省公路科学技术研究院
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