A Study on Permeability Characteristics of Asphalt Pavements (original) (raw)
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Field and Laboratory Investigation of Asphalt Pavement Permeability
me with all necessary support and guidance throughout my studying period. Their valuable feedback and constructive criticism to my thoughts were behind the success of this research. I would like to extend my honest thanks and appreciation to the examining committee, Professor John A. Goldak and Professor Shawn Kenny, for their comments and feedback on my thesis study. My deepest appreciation goes to my parents, Samir and Samiah, for supporting me spiritually and financially through this journey. I cannot forget my dear siblings, Ahmed, Hala, Sara, and Mohammed, for all their encouragement and for remembering me in their prayers. Special thanks go to my colleague Anandkumar Chelliah for providing me with all assistance in collecting the field and laboratory data. Last but not least, I would love to thank my dearest friend and brother, Mohammed Atef, for his support and sincere advice. The financial support provided by the Ministry of Transportation of Ontario (MTO) is highly
Analysis of permeability reduction in drainage asphalt mixtures due to decrease in void volume
Journal of Cleaner Production, 2019
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Journal of Environmental Management, 2013
Fully permeable pavement is gradually gaining support as an alternative best management practice (BMP) for stormwater runoff management. As the use of these pavements increases, a definitive test method is needed to measure hydraulic performance and to evaluate clogging, both for performance studies and for assessment of permeability for construction quality assurance and maintenance needs assessment. Two of the most commonly used permeability measurement tests for porous asphalt and pervious concrete are the National Center for Asphalt Technology (NCAT) permeameter and ASTM C1701, respectively. This study was undertaken to compare measured values for both methods in the field on a variety of permeable pavements used in current practice. The field measurements were performed using six experimental section designs with different permeable pavement surface types including pervious concrete, porous asphalt and permeable interlocking concrete pavers. Multiple measurements were performed at five locations on each pavement test section. The results showed that: (i) silicone gel is a superior sealing material to prevent water leakage compared with conventional plumbing putty; (ii) both methods (NCAT and ASTM) can effectively be used to measure the permeability of all pavement types and the surface material type will not impact the measurement precision; (iii) the permeability values measured with the ASTM method were 50e90% (75% on average) lower than those measured with the NCAT method; (iv) the larger permeameter cylinder diameter used in the ASTM method improved the reliability and reduced the variability of the measured permeability.
Environmental Earth Sciences, 2010
In coastal areas, abnormally high pressure may be caused by the tide-induced water table variation under extensive pavements, particularly during rainfall. To simulate the rainfall infiltration effects on the air permeability of asphalt pavements in coastal area, column-shaped asphalt sample was fixed in the upper part of a steel cylinder with its upper surface saturated with ponding water (depth \ 5 mm) and open to the atmosphere. The cylinder's lower part formed an air chamber. The chamber was pressurized and then the air therein was released naturally through the sample. The pressure variation with time in the chamber was recorded for analysis. Based on the Green-Ampt piston model for the surface water infiltration, an approximate analytical solution was derived to describe the pressure-time relationship in the chamber. A new parameter called the escape pressure was introduced to describe the air pressure needed for the chamber air to break through the capillary pressure induced by the ponding water. The analytical solution gave good estimations of both the escape pressures and the harmonic averages of the permeabilities of the wet and dry parts of 14 samples in the sense that excellent fittings were obtained between the observed and predicted air pressures in the air chamber. The estimated escape pressure ranges from 0.0 to 1.74 kPa. The harmonic average of the permeabilities of the wet and dry parts is 5-94% of the dry sample's permeability.
Impact of Construction Practices on Air Voids and Permeability of Asphalt Mixtures
Lecture Notes in Civil Engineering, 2020
Several isolated premature failures on the rehabilitated portion of the Lahore-Islamabad M-2 Motorway were observed, within a year of opening to traffic. Based on the visual evaluation of the distresses, failure causes could be attributed to poor in-pavement and surface drainage on the rehabilitated sections, segregation of HMA mixture, HMA mix-design, and the presence of heavy axle loads in the outer lanes. Cores in the distressed and normal areas were taken in different sections along the south and north bounds direction and several destructive tests were conducted on the HMA materials to determine the field compacted air voids. Also, field permeability in-situ tests were conducted on the same locations where cores were taken. Results showed that the mix segregation occurred in the fast lanes resulted in higher field air voids than the plant mixed-lab compacted samples. Thus, the permeability of mixes in these locations was significantly higher than expected, which caused water to seep through the surface mixes in all lanes. Additionally, due to the cross-fall of the HMA and aggregate base layers, the moisture entering in the fast and middle lanes accumulated under the outer lanes in both directions.
Evaluation of Permeability of Superpav® Asphalt Mixtures
Transportation Research Record, 2003
The presence of water in a pavement system is detrimental to its life. Permeable asphalt concrete pavement structures are vulnerable to stripping, which causes premature damage under heavy traffic. To assess the permeability of asphalt mixtures, a research study was conducted at the Louisiana Transportation Research Center (LTRC). Laboratory permeability tests were performed on field cores taken from 17 Superpave ® projects in Louisiana. An LTRC-modified version of Karol-Warner's falling-head permeameter was used to conduct the permeability test. A sensitivity analysis was performed to relate the permeability test results to mixture volumetric properties such as air void content, compaction effort, mixture gradation, and lift thickness. A statistical regression model was developed to predict the permeability of Superpave mixtures from the mixture volumetric properties. The model successfully predicted the coefficient of permeability of asphalt mixtures from a separate data set that was not included in the model development.
Air Voids Characterisation and Permeability of Porous Asphalt Mixture Used in Different Countries
This paper presents the evaluation made on the properties of porous asphalt mixtures practiced in different countries. In order to fully understand the properties of porous asphalt mixtures, investigation should be conducted from different perspectives. Therefore this study was carried out to investigate the air voids properties and functional performance of porous asphalt simultaneously. An image analysis technique was conducted to analyse the air void properties within the gyratory compacted samples captured using a non-destructive scanning technique of X-ray Computed Tomography (CT). The results were then compared to the functional performance in terms of permeability. Four aggregate gradations of porous asphalt used in different countries i.e. Malaysia, Australia, Singapore and the United States were adopted for comparison. From the analysis, Australian mixture was found with the most homogeneous air voids distribution throughout the sample compared to other mixtures. The air void properties investigated have successfully described the air voids formation within the mixtures which reflects the result of permeability. This shows that air voids distribution within the sample plays an important role in determining the effectiveness of water transmission.
Road Materials and Pavement Design, 2019
The deleterious effect of water is a major factor that causes early degradation in hot mix asphalt (HMA) materials. The coefficient of permeability (k) is a parameter used to characterise HMA hydraulic transport properties. This study numerically evaluated the influence of the spatial distribution of k on the flow pattern within an asphalt surface layer with different thicknesses. Initially samples with different heights were prepared in the lab and cut in three parts and the air voids (AV) content and k values in each part were determined. From the experimental relationship between AV and k numerical simulations were conducted to characterise the transient flow inside an asphalt surface layer divided into sublayers in order to represent typical AV vertical distributions observed in the field. The results show that the heterogeneous distribution of k within the HMA layer could produce regions that are more susceptible to moisture damage due to the accumulation of water.