Method for rapidly judging structure type of asphalt concrete

A kind of asphalt concrete and structure type technology, which is applied in the direction of measuring device, material analysis through optical means, instruments, etc., can solve the problem of not considering the interference effect of fine aggregate and filler on coarse aggregate, and the inability to effectively determine the skeleton of coarse aggregate Whether it is formed or not, it is difficult to control the construction quality of the asphalt layer, etc., to achieve the effect of avoiding cumbersome steps, quick judgment, and easy operation

Inactive Publication Date: 2013-09-18
HOHAI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the content of coarse aggregate is large, VCAmixDRC is easy to meet, so this criterion does not consider the impact of fine aggregate and filler on coarse aggregate. The interference of aggregates cannot effectively determine whether the skeleton of coarse aggregate is formed or not.
(2) The above criteria for judging the skeleton composition are mainly used in the process of asphalt concrete gradation design, and cannot make accurate and effective judgments on the asphalt concrete specimens that have been formed or the concrete structure inside the completed asphalt layer, so the above methods are difficult Used to control the construction quality of asphalt layers
Moreover, preliminary studies have found that asphalt concrete with different structure types has a large difference in its mesostructure and morphology.
However, how to apply image processing technology to the quantitative evaluation of asphalt concrete structure types has not been reported yet.

Method used

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  • Method for rapidly judging structure type of asphalt concrete
  • Method for rapidly judging structure type of asphalt concrete
  • Method for rapidly judging structure type of asphalt concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] For asphalt concrete gradation design, a quick judgment method of asphalt concrete structure type includes the following steps:

[0043] (1) Marshall specimens of fully graded asphalt concrete

[0044] With the gradation shown in Table 2, calculate the amount of asphalt according to formula (1).

[0045] Table 2 Aggregate gradation of asphalt concrete to be evaluated

[0046] Mesh size (mm) 16 13.2 9.5 4.75 2.36 1.18 0.6 0.3 0.15 0.075 Passing rate(%) 100 93 77 51 34 22 16 12 8 5.5

[0047] (1)

[0048] in, is the amount of asphalt; is the thickness of the asphalt film, usually taken as ; It is the sum of the specific surface area of ​​the aggregate in the asphalt mortar, which can be calculated according to formula (2).

[0049] (2)

[0050] in, The mass passing rates are 4.75mm, 2.36mm, ... and 0.075mm in turn.

[0051] According to the above formula, the calculated asphalt dosage of fully graded asphalt concr...

Embodiment 2

[0070] For the quality control of asphalt pavement, a method for quickly judging the type of asphalt concrete structure includes the following steps:

[0071] (1) Drilling holes on the road surface to obtain cylindrical samples

[0072] The asphalt concrete to be evaluated is the upper layer material of the asphalt pavement with a thickness of 40 mm, and the thickness of the middle layer and the lower layer of the pavement are 60 mm and 80 mm, respectively. After the top layer of asphalt has been rolled and the temperature of the pavement has dropped to room temperature, use a drilling corer to drill a cylindrical core sample with a diameter of 100 mm. In order to ensure the integrity of the core sample, the depth range of drilling is the entire asphalt pavement, and the core sample height thus obtained is the thickness of the entire asphalt pavement, that is, 180 mm. In a ventilated environment, dry the cylindrical core sample, and mark the position of the asphalt upper laye...

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Abstract

The invention discloses a method for rapidly judging the structure type of asphalt concrete. The method comprises the following steps of: molding a full-gradation Marshall specimen according to the gradation of asphalt concrete to be evaluated, or coring from an asphalt pavement so as to obtain a cylinder sample of the pavement; cutting the specimen or the sample and taking a picture of the section of the specimen or the sample with a digital camera to obtain an image of the section; acquiring an area ratio n1 of coarse aggregate in the image of the section to the section by image processing software; according to the proportion of the coarse aggregate part in the gradation of asphalt concrete to be evaluated, compacting the Marshall specimen for molding coarse aggregate asphalt macadam and obtaining an area ratio n2 of coarse aggregate in the section of the specimen to the section; if n1 is smaller than n2, judging that the asphalt concrete is of a suspending type structure; if not, judging that the asphalt concrete is of a skeleton type structure. The method is mainly used for rapidly judging the structure type of the asphalt concrete; the method not only brings convenience for engineering technicians to preferably select the gradation of aggregate, but also can be used for controlling the construction quality of the asphalt pavement.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for quickly judging the structure type of asphalt concrete. Background technique [0002] Asphalt concrete is one of the main construction materials of asphalt pavement, and it is usually used for the surface course and flexible base of asphalt pavement. Different use occasions of asphalt concrete require different structural types. For example, due to the direct effect of vehicle load, temperature and humidity on the upper layer of the pavement, the asphalt concrete paved on the upper layer must have a greater structural depth, better stability, and good aging resistance. It usually adopts skeleton dense and suspension dense structure; unlike the upper layer of the pavement, the lower layer does not directly bear the effects of vehicles, temperature and humidity, but it is usually subjected to large horizontal tensile stress, and the excellent fati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/00G01N15/00
Inventor 陈俊陈景雅刘云吴建涛
Owner HOHAI UNIV
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