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Method for designing mix proportion of high-modulus recycled asphalt mixture

A mix ratio design, recycled asphalt technology, applied in the field of road petroleum asphalt, can solve the problems of low recycling rate of construction waste, rutting disease, etc.

Pending Publication Date: 2021-12-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose is: 1. Utilize the old road milling materials, alleviate the problem of low recycling rate of construction waste, and reduce the project cost
; 2. Take the dynamic modulus as one of the factors to determine the optimal asphalt-stone ratio, increase the modulus of the mixture, and solve the problem that the middle surface layer is prone to rutting; interval

Method used

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  • Method for designing mix proportion of high-modulus recycled asphalt mixture
  • Method for designing mix proportion of high-modulus recycled asphalt mixture
  • Method for designing mix proportion of high-modulus recycled asphalt mixture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1: The milling material (0-5mm and 5-10mm) is obtained by crushing and screening the old road reconstruction, and the new aggregate adopts 10-20mm, 5-10mm limestone, 0-5mm machine-made sand and mineral powder. The gradation form is AC-20. The amount of milling material is 20%, and the passing rate of each sieve hole is shown in Table 1. It is determined from 3.5%, 4.0%, 4.5%, 5.0% and 5.5%, the traditional best oil-stone ratio OAC = 4.19%, 10Hz dynamic model Quantitative fitting results such as figure 1 As shown, the OAC is calculated from this modulus It is 3.97%, which is 0.22% lower than the traditional optimal oil-stone ratio, and the amount of oil in the mixture is reduced within a reasonable range. On the basis of adding milling material, the modulus of the mixture is further improved, which is beneficial to prevent the formation of ruts.

example 2

[0023] Example 2: The milling material (0-5mm and 5-10mm) is obtained by crushing and screening the old road reconstruction, and the new aggregate adopts 10-20mm, 5-10mm limestone, 0-5mm machine-made sand and mineral powder. The gradation form is AC-20. The amount of milling material is 35%, and the passing rate of each sieve hole is shown in Table 2. It is determined from 3.5%, 4.0%, 4.5%, 5.0% and 5.5% that the traditional best oil-stone ratio OAC=4.06%, and the dynamic modulus The fitting result is as figure 2 As shown, the OAC is calculated from this modulus It is 3.79%, which is 0.27% lower than the traditional optimal oil-stone ratio, and the amount of oil in the mixture is reduced within a reasonable range. On the basis of adding milling material, the modulus of the mixture is further improved, which is beneficial to prevent the formation of ruts.

example 3

[0024] Example 3: The milling material (0-5mm and 5-10mm) is obtained by crushing and screening the old road reconstruction, and the new aggregate adopts 10-20mm, 5-10mm limestone, 0-5mm machine-made sand and mineral powder. The gradation form is AC-20. The amount of milling material is 50%, and the passing rate of each sieve hole is shown in Table 3. It is determined from 3.0%, 3.5%, 4.0%, 4.5% and 5.0% that the traditional best oil-stone ratio OAC=3.73%, and the dynamic modulus The fitting result is as image 3 As shown, the optimum asphalt-stone ratio considering the modulus is 3.54%, which is 0.19% lower than the traditional optimum asphalt-stone ratio, and the amount of oil in the mixture is reduced within a reasonable range. The material modulus is further improved, which is beneficial to prevent the formation of ruts.

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Abstract

The invention discloses a high-modulus recycled asphalt mixture mix proportion design method, which uses an old road milling material as a recycled material and SBS composite modified rock asphalt as a binder, utilizes the old road milling material, relieves the problem of low recycling rate of construction waste, and reduces the construction cost. The dynamic modulus is used as one of optimal asphalt-aggregate ratio determination factors, the modulus of the mixture is improved, and the problem that rut damage is prone to being generated in a middle surface layer is solved, and a reasonable interval is provided for determining the mixing amount of the plant-mixed hot recycled mixture RAP. The dynamic modulus of the asphalt mixture with three milling material mixing amounts are tested in a stress control loading mode. A continuous half-sine wave compression load is applied under the temperature condition of 20 DEG C, and the loading frequency is 10Hz; wherein each asphalt mixture is subjected to three groups of parallel tests, and the results are averaged. When the dynamic modulus of the asphalt mixture is tested, according to the sequence of the temperature from low to high and the frequency from large to small, the damage to the sample and the test error are reduced.

Description

technical field [0001] The invention belongs to the technical field of road petroleum asphalt, and mainly relates to a method for designing the mixing ratio of high modulus recycled asphalt mixture. [0002] technical background [0003] In recent years, with the increase in the number of motor vehicles and the development of the transportation industry, land transportation is facing greater challenges. Reflected in the quality of the road surface, the increase in the number of rolling times and the axle load directly leads to the formation of serious rutting on the asphalt pavement during the service period, which directly affects the comfort and safety of driving, and the resulting joint problems will even become driving problems. Security risks. The high-temperature stability of asphalt mixture is one of its important properties, and the rutting deformation of the early damage of asphalt pavement is its outstanding performance. Rutting is formed by the permanent compress...

Claims

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Application Information

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IPC IPC(8): G16C60/00G16C10/00C04B26/26G01N33/42
CPCG16C60/00G16C10/00C04B26/26G01N33/42C04B18/16C04B14/06C04B14/28C04B14/02Y02W30/91
Inventor 郭猛张帅祥
Owner BEIJING UNIV OF TECH
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