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Test evaluation method for caking degree of RAP

An evaluation method and agglomeration technology, applied in the field of test evaluation of the degree of RAP agglomeration, can solve the problems of large test volume, inapplicability, and inapplicability of aggregates with a particle size larger than 4.75mm, etc. small amount of effect

Pending Publication Date: 2021-09-03
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The publication number is Chinese patent CN 108646007 B. The extraction loss rate is used to evaluate the degree of agglomeration of RAP, but this method needs to subdivide RAP into at least six levels and perform extraction and screening one by one, and the test volume is large
Ling Hongjie also proposed in related literature that the fineness modulus ratio should be used to quantitatively evaluate the degree of agglomeration of RAP. Aggregate with a particle size greater than 4.75mm
In addition, the above two methods are not suitable for evaluating the RAP of different gears after crushing

Method used

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  • Test evaluation method for caking degree of RAP
  • Test evaluation method for caking degree of RAP
  • Test evaluation method for caking degree of RAP

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention provides a kind of test evaluation method of RAP agglomeration degree, and method comprises the following steps:

[0029] Step A: RAP material 1 comes from the upper layer of Jiangsu Suhuaiyan Expressway. After sampling according to the sampling method recommended in the "Technical Specifications for Highway Asphalt Pavement Recycling" (JTG F41), put it in an oven at 60°C and dry it to constant weight;

[0030] Step B: Weigh 1500 g of RAP that has been dried to constant weight in step A, and sieve directly. After the screening is completed, the extraction test is carried out in accordance with the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20). The old aggregate obtained by extraction is dried in an oven at 105°C to constant weight, and the screening test is carried out after cooling. . According to the sieving results, calculate the pass rate of each sieve hole, take the sieve hole size as the equidistant abs...

Embodiment 2

[0035] The present invention provides a kind of test evaluation method of RAP agglomeration degree, and method comprises the following steps:

[0036] Step A: crush and sieve the RAP material in Example 1 into three grades of 12-22 mm (coarse), 5-12 mm (medium), and 0-5 mm (fine), according to the "Technical Specification for Recycling of Highway Asphalt Pavement" "(JTG F41) Recommended sampling method After sampling, place in an oven at 60°C and dry to constant weight;

[0037] Step B: Weigh 1500 g of coarse and medium RAPs and 1000 g of fine RAPs that have been dried to constant weight in step A, and sieve directly. After the screening is completed, the extraction test is carried out according to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20). The old aggregate obtained from the extraction is dried in an oven at 105°C to constant weight, and the screening test is carried out after cooling. . According to the sieving results, calcul...

Embodiment 3

[0042] The present invention provides a kind of test evaluation method of RAP agglomeration degree, and method comprises the following steps:

[0043] Step A: RAP material 2 comes from the upper layer of Jiangsu Ningsu-Xu Expressway. After sampling according to the sampling method recommended in the "Technical Specifications for Recycling of Highway Asphalt Pavement" (JTG F41), put it in an oven at 60°C and bake it to constant weight;

[0044] Step B: Weigh 1500 g of RAP that has been dried to constant weight in step A, and sieve directly. After the screening is completed, the extraction test is carried out in accordance with the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20). The old aggregate obtained by extraction is dried in an oven at 105°C to constant weight, and the screening test is carried out after cooling. . According to the sieving results, calculate the pass rate of each sieve hole, take the sieve hole size as the equidistant...

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Abstract

The invention discloses a test evaluation method for a caking degree of an RAP and belongs to the field of performance detection of recycled asphalt mixtures in highway engineering. The method comprises the following steps of: step A, preparing a test sample, namely drying the RAP in a drying oven to constant weight, taking out the RAP and cooling the RAP for later use; step B, drawing a grading curve graph of an old aggregate before RAP extraction and after RAP extraction; and step C, calculating an extraction refinement degree ds so as to evaluate the caking degree of different RAP materials. According to the method, required test instruments are conventional, the test amount is small, and quantitative index calculation is simple. The method is suitable for the RAP of different particle size grades.

Description

technical field [0001] The invention relates to a method for testing and evaluating the agglomeration degree of RAP, which belongs to the field of performance testing of recycled asphalt mixture in highway engineering. Background technique [0002] Asphalt pavement has been widely used in our country because of its good flatness and good driving comfort. As of the end of 2019, the total mileage of highways across the country reached 5.0125 million kilometers, of which more than 85% are asphalt roads. During the service process of the asphalt pavement, the asphalt gradually becomes hard and brittle due to the coupling effect of oxygen, water, light and heat, resulting in a series of diseases such as cracks and potholes, and the pavement has to be maintained or rebuilt. Tens of millions of tons of recycled asphalt pavement (RAP). [0003] The disposal of RAP will not only pollute land resources and destroy the ecological environment, but also waste non-renewable resources (R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42G01N1/28
CPCG01N33/42G01N1/28
Inventor 唐伟于新李宁詹贺张宇王鑫王中原
Owner HOHAI UNIV
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