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Method for wax-sealed measurement of asphalt mixture bulk density

A technology of bulk density and asphalt mixture, which is applied in the direction of material weighing, measuring devices, and analyzing materials, etc., can solve the problems of test detection failure, poor practical operability, confusion of opening gaps and structure depth, etc., to ensure accurate The effect of reliability, test results are true and reliable, and the brushing method is simple

Active Publication Date: 2009-07-08
RES INST OF HIGHWAY MINIST OF TRANSPORT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the price of the equipment and consumable plastic sealing film is relatively high, which is not suitable for large-scale promotion.
[0004] For the method of measuring the density of compacted asphalt concrete published on October 27, 2004, the application number 200310111980.4, there is also the method of measuring the density using the silica gel seal, which is also easy to confuse the opening gap and the depth of the structure. Because silica gel is a liquid in a certain flow state at the beginning of the test, if it is used to seal the test piece, the silica gel can easily enter the opening of the test piece, resulting in the failure of the test.
Therefore, the actual operability of this test method is not strong

Method used

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  • Method for wax-sealed measurement of asphalt mixture bulk density
  • Method for wax-sealed measurement of asphalt mixture bulk density
  • Method for wax-sealed measurement of asphalt mixture bulk density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Embodiment 1: measure the density of half-open asphalt mixture specimen:

[0044] Use an electronic balance with a measuring range of 4000g and a sensitivity of 0.01g to weigh the air weight ma=1209.5g of the dry test piece;

[0045] Melt the paraffin to the required temperature of 50-60°C, dip the paraffin melt with a brush and apply it evenly on the surface of the test piece, pay attention to controlling the wax temperature and the strength of the operation, so that the wax film is formed on the surface of the open pores, do not put the wax melt Point into the open pores;

[0046] Dry the wax-sealed test piece at room temperature for 30 minutes, adjust the wax temperature to 60-65 ° C, dip the wax melt in a vertical manner with the hand-held test piece, then turn the test piece and repeat in the same way;

[0047] Carefully check the sealed test piece, if there is any hole left, fill it with a brush dipped in wax;

[0048] When the surface of the test piece is dry, r...

Embodiment 2

[0054] Embodiment 2: Density of open-graded asphalt mixture:

[0055] Use an electronic balance with a measuring range of 4000g and a sensitivity of 0.01g to weigh the air weight ma=1150.66g of the dry test piece;

[0056] Melt the paraffin to the required temperature of 50-60°C, dip the paraffin melt with a brush and apply it evenly on the surface of the test piece, pay attention to controlling the wax temperature and the strength of the operation, so that the wax film is formed on the surface of the open pores, do not put the wax melt Point into the open pores;

[0057] Dry the wax-sealed test piece at room temperature for 30 minutes, adjust the wax temperature to 60-70 ° C, dip the wax melt in a vertical manner with the hand-held test piece, then turn the test piece and repeat in the same way;

[0058] Carefully check the sealed test piece, if there is any hole left, fill it with a brush dipped in wax;

[0059] When the surface of the test piece is dry, re-weigh the wax s...

Embodiment 3

[0065] Embodiment 3: the contrast of different measuring methods:

[0066] 3-1 The wax sealing method of the present invention is compared with the surface dry method

[0067] Use the same specimens first to measure the surface-dry bulk density of the group of specimens according to the determination method of the surface-dry bulk density stipulated in the "Test Regulations for Highway Asphalt and Asphalt Mixtures".

[0068] Dry the test pieces whose surface dry density has been measured with an American corelok vacuum dryer, re-weigh the air weight, and measure the wax-sealed bulk density of each test piece according to the steps specified in this method.

[0069] The bulk density measured under the two methods is compared in Table 1 below, and figure 1 .

[0070] Table 1 Determination of bulk density by different methods

[0071]

[0072] It can be seen from the test results that when the surface-dry method is used to measure the asphalt mixture when the asphalt ratio ...

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Abstract

The invention relates to a novel method for measuring wax-sealed bulk volume density of a wax seal measuring asphalt mixture, and belongs to the technical field of road asphalt mixture design. Through forming a wax film with definite thickness on the surface of an asphalt mixture test piece to wrap all opening apertures on the surface inside the wax film, a test piece volume comprising stone, asphalt, closed aperture and open aperture is formed, namely, a needed real volume, so that the test result is more real and reliable, and accuracy of mix design of the asphalt mixture is effectively ensured. The method can effectively unify the densities of the asphalt mixtures in different aperture ranges, and avoid inconvenience that the prior asphalt mixtures in the different aperture ranges need to adopt different density measuring methods.

Description

technical field [0001] It belongs to the subject of highway and urban road, the specialty of asphalt pavement, and the technical field of asphalt concrete design. Background technique [0002] Asphalt mixture is a kind of porous and heterogeneous material, the determination method of its porosity has always been a subject of engineering research. The "void" of asphalt mixture includes: closed pores, open pores and a part of the surface texture depth. Among them, the open void and the structural depth have similar characteristics, which are often confused when measuring the density, resulting in inaccurate density measurement of the mixture. Conceptually speaking, the open void is a part of the physical pores of the mixture, which directly affects the mechanical properties and road performance of the mixture, while the construction depth is the requirement of the basic road performance of the mixture to ensure that the road surface has a certain anti-skid performance , to e...

Claims

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Application Information

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IPC IPC(8): G01N5/00G01N1/36
Inventor 王旭东张蕾谢国瑞张宇薄京喜
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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