Long-Term Effects of Subsurface Drainage on Performance of Asphalt Pavements

2021 ◽  
pp. 036119812110326
Author(s):  
Pinyu Ji ◽  
Hongren Gong ◽  
Lin Cong ◽  
Xiaoyang Jia ◽  
Baoshan Huang
Keyword(s):  
Performance Indicators ◽  
Soil Classification ◽  
Subsurface Drainage ◽  
Climatic Conditions ◽  
Pavement Performance ◽  
Long Term Effects ◽  
Longitudinal Cracking ◽  
Long Term Performance ◽  
Term Performance

This study investigated the effects of subsurface drainage on the long-term performance of pavements. The Specific Pavement Study 1 (SPS-1) experiment of the Long-Term Pavement Performance Program (LTPP) was selected to extract performance data. Four types of cracking, rut depth, and International Roughness Index (IRI) were used as the performance indicators. Other relevant factors affecting the pavement performance were also considered: surface thickness, base type, base thickness, subgrade soil classification, total thickness, age, and climatic conditions. The significant factors to long-term performance were identified using two methods: exploratory data analyses and mixed-effects models (MEMs). Results from the analyses showed that drainage only substantially affected the transverse cracking (TC) and rutting and had little effect on the other performance indicators. Sections in the dry and non-freeze region had the best riding quality and exhibited the least alligator cracking, non-wheelpath longitudinal cracking (NWPLC), and TC, but this climatic condition worsened the wheelpath longitudinal cracking (WPLC). The use of drainage in sections from the wet-freeze (WF) region significantly retarded the development of distress. For drained sections, the base comprising an asphalt-treated base over a permeable asphalt-treated base (PATB) better sustained the smoothness and resisted rutting. For undrained sections, the asphalt-treated base was a superior alternative. Sections on sites with fine subgrade showed less WPLC, NWPLC, and TC, while those on coarse subgrade sites showed less alligator cracking and better riding quality. Sections on sites with fine subgrade showed less WPLC, NWPLC, and TC, while those on coarse subgrade sites showed less alligator cracking and better riding quality.

Selection of External Coatings for Northern Pipelines: Laboratory Methodologies for Evaluation and Qualification of Coatings

2004 ◽  
Author(s):  
Sankara Papavinasam ◽  
R. Winston Revie ◽  
Michael Attard
Keyword(s):  
Standardized Tests ◽  
Protective Coatings ◽  
Climatic Conditions ◽  
Operational Conditions ◽  
The North ◽  
Long Term Performance ◽  
Term Performance ◽  
Near Future ◽  
Selection Of

In the near future, the construction of northern pipelines for transmission of natural gas will begin in North America. Construction in the harsh northern climate, with temperatures as low as −45°C, and remote location will impose unique challenges with respect to protective coatings. It is critical that the design of coatings be adequate to protect the pipelines under long-term, severe environmental conditions, including the extreme climatic conditions that will apply in the North before the pipe is installed and operation begins. There are many quality coatings from which to choose for application on new pipelines. The main issue is in understanding how to select and use coatings on pipelines in new regimes (e.g. Northern pipelines), which may operate in a different environment than do existing pipelines. Uniform, standardized tests that would simulate the conditions during construction and operation of Northern pipelines will allow external pipeline coatings to be selected with confidence regarding anticipated long-term performance under operational conditions. Selection of mainline coatings is important, but there is also a need to focus on field-applied coatings for both repairs and joints. Methodologies and standards that are available to evaluate coatings are reviewed in this paper.

End-Result Specifications for Warranted Asphalt Pavements

1998 ◽  
Vol 1632 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Sameh Zaghloul ◽  
Nasser A. Saeed ◽  
Ali Al Jassim ◽  
Ahmed M. Rafi
Keyword(s):  
Functional Performance ◽  
Power Spectral Analysis ◽  
Maintenance Cost ◽  
Long Term Effects ◽  
Pavement Roughness ◽  
Power Spectral ◽  
Long Term Performance ◽  
User Friendly ◽  
Term Performance

Long-term pavement performance is highly dependent on its initial condition. High initial roughness leads to higher maintenance and rehabilitation costs, to shorter service life, and to significant reduction in riding quality. A performance-based specification applicable for new and rehabilitated warranted pavements is developed and presented here. The primary purpose of this specification is control of the initial longitudinal roughness of pavements, which will lead to smoother pavements and hence satisfactory long-term performance. In this specification, pavement roughness is measured by using Class I or calibrated Class II profilometers, such as infrared and laser profilometers. Tests are performed on each asphalt layer before the next layer is constructed. Three criteria are considered in the specification: surface tolerance, roughness indices, and repeated waves. It should be noted that this specification focuses on the functional performance of pavements and does not directly address their structural performances. A user-friendly software is developed to implement this specification. The software is capable of simulating straightedge inspections, calculating roughness statistics, and performing frequency analyses, such as power spectral analysis. With the software, a pavement section can be evaluated, tested, and analyzed in few minutes. Highway agencies as well as contractors will benefit from implementing this specification. Highway agencies will benefit by being able to achieve the goal of having safe, smooth, and economic pavements, and contractors will benefit by reducing maintenance cost during maintenance and warranty periods. Also, contractors will get quick results and meaningful feedback to the paving operation. A payment structure, including bonus payments for extended service lives, is included in the specification. This payment structure is based on the long-term effects of the initial roughness on the pavement life-cycle costs. The bonus program will encourage contractors to achieve higher levels of quality.

scholarly journals Long-term performance and life cycle assessment of energy piles in three different climatic conditions

2020 ◽  
Vol 146 ◽  
pp. 1177-1191 ◽  
Author(s):  
Melis Sutman ◽  
Gianluca Speranza ◽  
Alessio Ferrari ◽  
Pyrène Larrey-Lassalle ◽  
Lyesse Laloui
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Climatic Conditions ◽  
Energy Piles ◽  
Long Term Performance ◽  
Term Performance

Using constructed wetlands to treat subsurface drainage from intensively grazed dairy pastures in New Zealand

2003 ◽  
Vol 48 (5) ◽  
pp. 207-213 ◽  
Author(s):  
C.C. Tanner ◽  
M. Long Nguyen ◽  
J.P.S. Sukias
Keyword(s):  
New Zealand ◽  
Constructed Wetlands ◽  
Subsurface Drainage ◽  
Organic N ◽  
Nutrient Concentrations ◽  
Start Up ◽  
Catchment Areas ◽  
Long Term Performance ◽  
Term Performance

Performance data, during the start-up period, are presented for constructed wetlands treating subsurface drainage from dairy pastures in Waikato (rain-fed) and Northland (irrigated), North Island, New Zealand. The wetlands comprised an estimated 1 and 2% of the drained catchment areas, respectively. Nitrate concentrations were high in the drainage inflows at both sites (medians 10 g m-3 at Waikato and 6.5 g m-3 at Northland), but organic N was also an important form of N at Waikato (37% of TN). Comparison of wetland inflow and outflow nutrient concentrations showed overall nutrient reductions during passage through the wetlands for NO3-N (34 and 94% for medians, respectively), TN (56 and 33%, respectively), and DRP (80%, Northland only). Median NH4-N (both sites) and DRP (Waikato) concentrations showed apparent increases between the wetland inlets and outlets. However, a mass balance calculated for the 3 month preliminary monitoring periods showed substantial mass removal of DRP (80%) and all measured forms of N (NO3-N 78%, NH4-N 41%, Org-N 99.8% and TN 96%) in the Waikato wetland. Monitoring of these systems needs to be continued through a range of seasons and years to fully assess their long-term performance.

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