Microstructural investigation on air void properties of porous asphalt using virtual cut section

Mahmud, Mohd Zul Hanif; Hassan, Norhidayah Abdul; Hainin, Mohd Rosli; Ismail, Che Ros

doi:10.1016/j.conbuildmat.2017.08.103

Cited by 44 publications

(11 citation statements)

References 27 publications

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“…In contrast, the AV number is relatively homogeneously distributed throughout the sample height. Similar observations were not only reported by Hassan et al [11], Mahmud et al [29], and Alvarez et al [20], but also predicted by Chen et al [37] using a DEM-predicted model. e u-shaped vertical AV distribution is a suggested result of the "confinement effect" during the compaction process [29].…”

Section: Resultssupporting

confidence: 90%

“…Similar observations were not only reported by Hassan et al [11], Mahmud et al [29], and Alvarez et al [20], but also predicted by Chen et al [37] using a DEM-predicted model. e u-shaped vertical AV distribution is a suggested result of the "confinement effect" during the compaction process [29]. Furthermore, similar distribution patterns of AV content and AV number in the vertical direction inside dense-graded asphalt specimens were observed by Xu et al [38], Masad and Button [39], and Hassan et al [11] using different types of Superpave gyratory compaction (SGC) specimens compacted under different numbers of gyrations.…”

Section: Resultssupporting

confidence: 90%

“…Meanwhile, both the specific surface area and fractal dimension levels remain relatively comparable throughout the specimen height, indicating that the surface texture of voids throughout the specimen height remains relatively constant. A similar pattern of void diameter distribution in the vertical direction was also observed by Mahmud et al [29]. However, the parameter they used was equivalent projection area, which is a bit different from the one used in this study.…”

Section: Resultssupporting

confidence: 85%

“…ey also indicated that controlling the compaction process helps to fully develop the stone-onstone contact condition. Hassan et al [11] indicated that AV characteristics including the total AV content, AV number, and AV size (area) in vertical and horizontal sections were able to describe the influence of AV formation with the mixture on the permeability rate of PA. Mahmud et al [29] observed most of the AVs in PA mixtures were elongated, and the percentage of AV and number of AV in the crosssectional images of the PA mixture had an inverse relationship. Overall, pioneering research has confirmed that X-ray CT and related image analysis techniques are the effective and practical tools helping to characterize the properties and distribution of AV in PA mixtures on the microscale.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Properties and Distribution of Air Voids in Porous Asphalt with Relevance to the Pb(II) Removal Performance

Zhao

Tong²,

Zhu

2019

Advances in Materials Science and Engineering

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In this study, one type of porous asphalt (PA) mixture was designed at two different air void (AV) contents. Direct information regarding both the dimensional properties and AV distribution within two PA specimens in their natural states were observed, compared, and analyzed based on the X-ray CT (computed tomography) and digital image analysis techniques and fractal geometry theory. The characteristics of AV distribution, including AV content, AV number, and AV volume were quantified by comparing pore structure at different specimen heights. The dimensional properties of voids at different specimen heights were characterized by parameters in terms of equivalent diameter, specific surface area, and fractal dimension. The Pb(II) removal performance of the two PA mixtures was examined by an artificial rainfall event. The relationship between the PA microstructure and Pb(II) removal rate was then determined. It is observed from this study that the overall distribution pattern of AV inside PA specimen is independent of AV content. The distributional parameters including AV content, AV number, and AV volume show good correlations with three dimensional parameters, respectively. The Pb(II) removal in general appears to be independent of AV content because both PA mixtures have the same level of performance in removing Pb(II) during the rainfall period. The removal rate of Pb(II) shows good correlation with AV content, AV number, AV volume, and equivalent diameter of AV, indicating that a perfect distribution of AV within PA mixture is more important than the complex geometries of voids for getting a higher Pb(II) removal during rainfall event and without providing a temporary storage of stormwater in PA mixture. These findings provide an effective evidence to reveal that the AV distribution and properties characteristics have significant implications for pollutant removal in field PA pavement system.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation on the Properties and Distribution of Air Voids in Porous Asphalt with Relevance to the Pb(II) Removal Performance

Zhao

Tong²,

Zhu

2019

Advances in Materials Science and Engineering

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“…Alber [14,15] analyzed the characteristic parameters of the air void and skeleton structures and influence of soiling phenomena on air-void microstructures of the porous asphalt through the CT scanning technique. Mahmud [16] used a non-destructive method (CT method) employing virtual cut section to analyze the content, number, shape, and size of voids of laboratory-fabricated porous asphalt. Zhao [17] used CT scanning technology to distinguish the valid and invalid interconnected pores in order to evaluate the distribution of various types of pores, and finally proposed a new evaluation index of pore distribution.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nominal Maximum Aggregate Size and Aggregate Gradation on Pore Characteristics of Porous Asphalt Concrete

Huang

Cai

et al. 2020

Materials

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Porous asphalt concrete (PAC) has been used to improve the traffic conditions in rainy weather due to its high porosity. Aggregate size and gradation have great impact on the connected pore structure, which ultimately affects the permeability of porous asphalt concrete. In this paper, the topological properties of connective pores including pore area, pore circularity, equivalent pore diameter, and void network of porous asphalt concrete with different nominal maximum aggregate sizes and gradations were analyzed using x-ray computer tomography scans and the image processing technique. It was observed that the maximum aggregate sizes will not have significant effect on the percentage of connected pores to total pores for porous asphalt concrete. Furthermore, the percentage of connected pores to total pores is related to the air void content, but for PAC-13 with 20% target air void content or above, the connectivity does not seem to have a sharp increase. Additionally, porous asphalt concrete with a smaller nominal particle size or lower target air void content seems to generate a more concentrated distribution of Eqdiameter. Moreover, pore circularities for porous asphalt concrete with a maximum aggregate size of 10 mm or above are independent of maximum aggregate sizes. Air void contents ranging from 16% to 21% do not have a significant effect on the voids’ circularity. Furthermore, the branching nodes in porous asphalt concrete with a smaller nominal maximum aggregate size or lower target air void content have a more uniform spatial distribution. However, the percentage of cross-linked number to total node raises as the nominal maximum aggregate size or target air void content increases.

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Effect of Global Thresholding Algorithms on Pervious Concrete Pore Network Properties Using XRCT-Based Digital Image Processing

Jagadeesh

Ong

2020

Lecture Notes in Civil Engineering

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Microstructural investigation on air void properties of porous asphalt using virtual cut section

Cited by 44 publications

References 27 publications

Investigation on the Properties and Distribution of Air Voids in Porous Asphalt with Relevance to the Pb(II) Removal Performance

Investigation on the Properties and Distribution of Air Voids in Porous Asphalt with Relevance to the Pb(II) Removal Performance

Influence of Nominal Maximum Aggregate Size and Aggregate Gradation on Pore Characteristics of Porous Asphalt Concrete

Effect of Global Thresholding Algorithms on Pervious Concrete Pore Network Properties Using XRCT-Based Digital Image Processing

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