Clogging evaluation of porous asphalt concrete cores in conjunction with medical x-ray computed tomography

2014 ◽  
Author(s):  
Yu-Min Su ◽  
Chen-Yu Hsu ◽  
Jyh-Dong Lin
Keyword(s):  
Computed Tomography ◽  
Asphalt Concrete ◽  
Porous Asphalt ◽  
X Ray ◽  
X Ray Computed ◽  
Porous Asphalt Concrete

Preliminary Study on X-Ray Computed Tomography to Evaluate Voids in Porous Asphalt Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 345-353 ◽  
Author(s):  
J. D. Lin ◽  
Ming Chin Yeh ◽  
Po Hsun Sung ◽  
R. H. Shiu
Keyword(s):  
Computed Tomography ◽  
Asphalt Concrete ◽  
Mix Design ◽  
Air Voids ◽  
Porous Asphalt ◽  
X Ray ◽  
X Ray Computed ◽  
Preliminary Study ◽  
Porous Asphalt Concrete ◽  
Pore Clogging

The study applies Computed Tomography technology to probe into the porous asphalt concrete and air voids content, and at the same time, try to qualify accessible voids and closed voids and to use the result to evaluate the performance of porous asphalt concrete. The nominal maximum aggregate of this study is 19.0mm. In order to adjust the image of the gray threshold, the void of PAC specimen was obtained by cut-and-try method with the mix design. After scanning through the PAC specimen, the self-innovated software is used to calculate the Va(%), accessible voids and closed voids. After careful calculation, it showed that the accessible voids are about 20.3%, and the closed voids are about 1.15%. Base on the study, it could analyze the effect of pore clogging in PAC with improved the durability and lifetime.

scholarly journals Drying of Porous Asphalt Concrete Investigated by X-Ray Computed Tomography

2015 ◽  
Vol 69 ◽  
pp. 451-456 ◽  
Author(s):  
I. Jerjen ◽  
L.D. Poulikakos ◽  
M. Plamondon ◽  
Ph. Schuetz ◽  
Th. Luethi ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Asphalt Concrete ◽  
Porous Asphalt ◽  
X Ray ◽  
X Ray Computed ◽  
Porous Asphalt Concrete

Air Void Characterisation in Porous Asphalt Using X-Ray Computed Tomography

2014 ◽  
Vol 911 ◽  
pp. 443-448 ◽  
Author(s):  
Abdul Hassan Norhidayah ◽  
Mohd Zul Hanif Mahmud ◽  
Putra Jaya Ramadhansyah
Keyword(s):  
Computed Tomography ◽  
Aggregate Size ◽  
Size Composition ◽  
Maximum Aggregate Size ◽  
Aggregate Gradation ◽  
Air Voids ◽  
Porous Asphalt ◽  
X Ray ◽  
Specimen Height ◽  
X Ray Computed

This study presents the characterisation of the air voids distribution for porous asphalt mixtures compacted using gyratory compactor. The distribution of voids content and voids shape within the porous asphalt were characterised for different nominal maximum aggregate size (NMAS) and specimen height. This is to evaluate the effect of different aggregate size composition and lift thickness on the air voids characteristics of the compacted porous asphalt. Two types of gradations were adopted i.e. Grading A (with NMAS=10 mm) and Grading B (with NMAS=14 mm) and they were fabricated for two different heights (50 and 100 mm). The internal structure was captured using X-ray Computed Tomography and image analysis techniques were used to process and analyse the images. It was found that mixture with coarse aggregate gradation produced larger void size with an elongated shape, which indicates voids connectivity within the mixture compared to fine gradation with more circular and smaller void size.For lift thickness, itacts differentlyfor different aggregate gradations. The specimen produced greater voids connectivity when the fine and coarse gradations were compacted at 100 mm and 50 mm respectively. These show that NMAS and lift thickness influence the mobility of the aggregate particles during compaction which affect the voids formation and determine the effectiveness of the compaction.

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