Leaching of PAHs from Hot Mix Asphalt Pavements

2007 ◽  
Vol 24 (10) ◽  
pp. 1409-1422 ◽  
Author(s):  
H. Birgisdóttir ◽  
J. Gamst ◽  
T.H. Christensen
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Pavements

Study of Longitudinal-Joint Construction Techniques in Hot-Mix Asphalt Pavements

1996 ◽  
Vol 1543 (1) ◽  
pp. 106-112 ◽  
Author(s):  
Prithvi S. Kandhal ◽  
Rajib B. Mallick
Keyword(s):  
Density Gradient ◽  
Hot Mix Asphalt ◽  
Conventional Technique ◽  
Asphalt Pavements ◽  
Joint Construction ◽  
Construction Techniques ◽  
Longitudinal Joint ◽  
The Face ◽  
Long Term Performance ◽  
Term Performance

There is a need to identify suitable longitudinal-joint construction techniques for multilane, hot-mix asphalt pavements that can minimize or eliminate cracking at the joint and raveling adjacent to the joint. It is believed that the longitudinal cracks result primarily from the density gradient that is usually encountered across the joint. This density gradient can be attributed to low density at the unconfined edge when the first lane is paved and relatively high density at the confined edge when the adjacent lane is paved. Seven different longitudinal-joint construction techniques were used on I-25 in Colorado in 1994, including various rolling procedures to compact the joint, provision of a vertical face with a cutting wheel, and use of rubberized asphalt tack coat on the face of the unconfined edge. Two longitudinal-joint construction techniques were used on I-79 in Pennsylvania in 1994: the conventional technique (control) and the New Jersey–type wedge joint. The latter technique uses a 3:1 taper at the unconfined edge of the first lane. The face of the taper is heated with an infrared heater before the adjacent lane is placed. Pavement cores were taken on the joint and 305 mm (1 ft) away from the joint for density measurements in all experimental test sections. Different techniques for joint construction have been ranked on the basis of statistical analysis of all density data. Various joints were also evaluated visually by teams of at least four engineers in June 1995. The performance, or ranking, of the joints in both Colorado and Pennsylvania projects after one winter seems to have been influenced by the overall density at the joint. The joints with high densities indicate better performance than those with relatively low densities. These rankings may change in the future on the basis of the long-term performance as measured by cracking and raveling.

scholarly journals Sustainability Evaluation of Cold In-Place Recycling and Hot Mix Asphalt Pavements: A Case of Qassim, Saudi Arabia

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 50
Author(s):  
Fawaz Alharbi ◽  
Fahad Alshubrumi ◽  
Meshal Almoshaogeh ◽  
Husnain Haider ◽  
Ahmed Elragi ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Hot Mix Asphalt ◽  
Multicriteria Analysis ◽  
Resource Depletion ◽  
Three Dimensions ◽  
Asphalt Pavements ◽  
Skilled Labor ◽  
Equivalent Thickness ◽  
Traffic Volumes ◽  
Cold Recycling

The construction of conventional hot mix asphalt (HMA) pavements results in a number of economic and environmental issues, such as the cost of new overlays and associated impacts on natural resources. Although the cold recycling with an emulsified asphalt-recycling agent holds certain benefits over the HMA, its implementation on different road types, ranging from farm-to-market roads to expressways, is yet contentious due to the need for sophisticated equipment and trained workforce. The present research developed a methodology to evaluate all the three dimensions of sustainability, including economic (construction cost), environmental (natural resource depletion), and social (need for advanced equipment and skilled labor) of various scenarios of RAP and conventional asphalt pavements. The present study evaluated an equivalent thickness of the Cold In-place Recycling (CIR) pavement, which behaves similar to HMA pavement under the influence of different traffic loads. Fifty CIR and HMA scenarios for different traffic volumes and pavement layers thicknesses were developed. Finally, the sustainability of all the scenarios was evaluated for traffic designation in Saudi Arabia using fuzzy-based multicriteria analysis. Ranking of scenarios found CIR as a more sustainable overlay option for the feeders, collectors, main urban streets, expressways, and heavily trafficked highways in industrial areas where ESALs (Equivalent Single Axle Loads) range between 2,000,000 and >31,000,000. Considering the limited availability of advanced equipment and skilled labor for CIR pavements, HMA was found be a more sustainable option for farm-to-market roads with the “very light” traffic class. The methodology will help the pavement managers in decision making regarding the selection of sustainable pavement technologies for different road types in Saudi Arabia and the rest of the world.

Top-Down Cracking Prediction Tool for Hot Mix Asphalt Pavements

2012 ◽  
pp. 465-474 ◽  
Author(s):  
Cheolmin Baek ◽  
Senganal Thirunavukkarasu ◽  
B. Shane Underwood ◽  
Murthy N. Guddati ◽  
Y. Richard Kim
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Pavements ◽  
Prediction Tool ◽  
Top Down

scholarly journals Investigation on Hamburg Wheel-Tracking Device Stripping Performance Properties of Recycled Hot-Mix Asphalt Mixtures

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4704
Author(s):  
Waqas Rafiq ◽  
Madzlan Bin Napiah ◽  
Muslich Hartadi Sutanto ◽  
Wesam Salah Alaloul ◽  
Zarisha Nadia Binti Zabri ◽  
...  
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Pavement ◽  
Asphalt Mixtures ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Persistent Problem ◽  
Moisture Stability ◽  
Tracking Device ◽  
Wheel Tracking ◽  
Hamburg Wheel Tracking

Moisture damage in hot mix asphalt pavements is a periodic but persistent problem nowadays, even though laboratory testing is performed to identify different moisture-susceptible mixtures. In this study, a Hamburg Wheel Tracking device (HWTD) was used for rutting tests which were conducted on control and a high percentage of recycled asphalt pavement (RAP), i.e., 30%, 50% and 100% of virgin mixtures, under air dry and water-immersed conditions. Similarly, the extracted bitumen from RAP was tested for binder physical properties. Results showed that the asphalt mixtures containing RAP have less rut depth as compared to the control mix both in air dry and immersion conditions and hence showed better anti-rutting properties and moisture stability. Stripping performance of control and RAP containing mixtures was also checked, concluding that the RAP mixture was greatly dependent on the interaction between the binder (virgin plus aged) and aggregates.

scholarly journals Evaluation of Optimum Content of Rice Husk Ash to Improve the Hot Asphalt Concrete Performance

2018 ◽  
Vol 7 (4.20) ◽  
pp. 338
Author(s):  
Gholamali Shafabakhsh ◽  
Hassan Divandari ◽  
Seyed Reza Sajadi
Keyword(s):  
Rice Husk ◽  
Hot Mix Asphalt ◽  
Rice Husk Ash ◽  
Asphalt Mixture ◽  
Asphalt Mixtures ◽  
Asphalt Pavements ◽  
Waste Products ◽  
Stone Materials ◽  
Dynamic Creep ◽  
Powder Content

Durability of asphalt pavements is related to choosing proper materials. Fillers as the smallest particles of stone materials, and one of the most important parts of asphalt mixtures, exert pivotal effects on the performance of asphalt mixtures, by filling empty spaces and because of their softness, surface features and chemical compounds. Rice husk ash is one of the waste products of burning rice husk in powerhouses that is accounted as biomass. Recently, a good many of investigations have shown that rice husk ash, as a high quality pozzolan, can be properly replaced of common aggregates. In this study rice husk ash was used as filler in hot mix asphalt, and the result mixtures’ mechanical properties was compared with ordinary mixtures whose filler was stone powder. Asphalt mixture samples with two different aggregate graded, and 0, 25, 50, 75 and 100 percent of rice husk ash which were the substitution of stone powder content, were made and the effects of using rice husk ash on the moisture sensitivity, resilience modulus, rutting and dynamic creep of asphalt mixtures were investigated. The results demonstrated that increase of using rice husk ash as the replacement of prevalent fillers in hot mix asphalts, noticeably improves their performance; however, because of excessive stiffness created by rice husk ash, it's better to use it in optimized percentage. Accordingly, statistical analysis of the tests’ results leads to presenting an optimized model for the content of Rice Husk Ash to be used in hot mix asphalt. Finally, Rice Husk Ash content were suggested 26% for graded number 4 and 48% for graded number 5 as replacements for stone powder filler. 

Evaluation of Friction Performance of Coarse Aggregates and Hot-Mix Asphalt Pavements

2007 ◽  
Vol 35 (6) ◽  
pp. 100903
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Shuo Li ◽  
Karen Zhu ◽  
Samy Noureldin
Keyword(s):  
Hot Mix Asphalt ◽  
Asphalt Pavements ◽  
Coarse Aggregates ◽  
Friction Performance
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