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Testing device of coagulated frost depth and deformation non-uniformity of surface of porous asphalt mixture and method thereof

A technology of asphalt mixture and testing method, which is applied in measuring device, electromagnetic measuring device, electric/magnetic depth measurement, etc., can solve the problems of uneven frost depth and deformation on the surface of porous asphalt mixture, lack of etc.

Active Publication Date: 2019-08-27
HOHAI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the lack of research on frosting on the surface of porous asphalt mixture in the prior art, the present invention provides a test device and method for testing frosting depth and deformation non-uniformity on the surface of porous asphalt mixture to quantitatively evaluate the frost damage degree of the mixture

Method used

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  • Testing device of coagulated frost depth and deformation non-uniformity of surface of porous asphalt mixture and method thereof
  • Testing device of coagulated frost depth and deformation non-uniformity of surface of porous asphalt mixture and method thereof
  • Testing device of coagulated frost depth and deformation non-uniformity of surface of porous asphalt mixture and method thereof

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Embodiment

[0045] The following examples illustrate the frost deformation test method of porous asphalt mixture under different humidity. The porous asphalt mixture to be evaluated in the examples is OGFC-13, and its gradation, asphalt content BC, and void ratio VV are shown in Table 1.

[0046] The OGFC-13 that the embodiment of table 1 adopts

[0047]

[0048] (1) Specimen preparation and instrument arrangement

[0049] According to Table 1, the porous mixture Marshall specimen was molded, stored at room temperature for 24 hours, and then removed from the mold. The diameter of the porous mixture Marshall specimen was measured by a vernier caliper to be 101.6 mm, and the height was 63.5 mm. The specimen was scanned by the Discovery CT750HD medical CT instrument, and the scanned image was imported into the software Mimics to reconstruct the three-dimensional model of the specimen.

[0050] Then use 704 silicone rubber to paste five pieces of strain gauges 2 of model BX120-5AA equidi...

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Abstract

The invention discloses a testing device of coagulated frost depth and deformation non-uniformity of a surface of a porous asphalt mixture and a method thereof. The testing device comprises a cylindercontainer made of organic glass, an atomizer, a temperature-humidity controller, a strain tester and a CT scanner. The method comprises the following steps: firstly scanning a porous asphalt mixtureMarshall specimen by using the CT scanner and reconstructing to obtain a specimen three-dimensional model, then pasting a plurality of resistance strain gages on the side of the specimen along a circumferential direction, putting the specimen in the cylinder container and putting the cylinder container into a refrigerator, then introducing water vapor atomized by the atomizer, enabling the humidity in the cylinder container to be stabilized at 96%-98% by using the temperature-humidity controller, collecting readings of the resistance strain gages by using the strain tester, calculating non-uniformity coefficient and evaluating the deformation non-uniformity of the porous asphalt mixture, finally scanning the specimen again and reconstructing a model, and measuring the coagulated frost depth by using Boolean calculation. The testing method and the device thereof are capable of quantitatively evaluating the coagulated frost depth and the deformation non-uniformity of the surface of the porous asphalt mixture.

Description

technical field [0001] The invention belongs to the field of frost resistance performance evaluation of porous asphalt pavement, and in particular relates to a test device and method for frosting depth and deformation non-uniformity on the surface of porous asphalt mixture. Background technique [0002] With the promotion and application of porous asphalt pavement, while realizing the functions of drainage, noise reduction, anti-skid, anti-glare and decontamination, many problems have also appeared. In addition to the common damage such as pore blockage and looseness, the night temperature drops , the amount of saturated water vapor contained in the air decreases, and the excess water vapor adheres to the surface of the porous pavement and condenses into frost. Because the pavement is porous and the temperature of the road surface is low, the amount of frost condensation is often large. "Black ice" seriously reduces the anti-skid performance of the road surface, which can ea...

Claims

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Application Information

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IPC IPC(8): G01N3/60G01N33/42G01N23/046G01B7/26G01B7/28G01B15/04G01B15/00
CPCG01B7/26G01B7/28G01B15/00G01B15/04G01N3/60G01N23/046G01N33/42
Inventor 陈俊周政殷小晶刘鑫
Owner HOHAI UNIV
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