Test method for frosting depth and deformation non-uniformity on the surface of porous asphalt mixture
A technology of asphalt mixture and test method, which is applied in the direction of electric/magnetic depth measurement, strength characteristics, analysis of materials, etc., can solve the problems of uneven frost depth and deformation on the surface of porous asphalt mixture, lack of
Active Publication Date: 2021-06-08
HOHAI UNIV
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[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
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[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 test device and method for frosting depth and deformation non-uniformity on the surface of porous asphalt mixture. The test device includes a cylindrical container made of plexiglass, an atomizer, a temperature and humidity controller, a strain tester and a CT scanner. First, a CT scanner is used to scan the Marshall specimen of porous asphalt mixture, and the three-dimensional model of the specimen is obtained by reconstruction. Put the container in the refrigerator, then introduce the water vapor atomized by the atomizer into the cylindrical container, use the temperature and humidity controller to stabilize the humidity in the cylindrical container between 96% and 98%, and use the strain tester to collect the resistance strain The sheet readings are used to calculate the non-uniformity coefficient to evaluate the deformation non-uniformity of porous asphalt mixture. Finally, the specimen is scanned again and the model is reconstructed, and the frosting depth is measured by using Boolean operations. The invention can quantitatively evaluate the frosting depth and deformation inhomogeneity on 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...
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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