Predicting Rutting of Unbound Aggregate Layers Using Total Void Calculation under Full-Scale Testing at the FAA National Airport Pavement Test Facility

2010 ◽  
Author(s):  
Jeffrey Gagnon ◽  
Navneet Garg
Keyword(s):  
Full Scale ◽  
Test Facility ◽  
Airport Pavement ◽  
Unbound Aggregate ◽  
Full Scale Testing

Evaluation of Asphalt Drainable Base Structural Performance for Flexible Airport Pavement Design

2018 ◽  
Vol 2672 (23) ◽  
pp. 128-136
Author(s):  
Qiang Li ◽  
Benjamin Mahaffay ◽  
Jeffrey Gagnon
Keyword(s):  
Data Analysis ◽  
Test Data ◽  
Full Scale ◽  
Pavement Design ◽  
Test Facility ◽  
Construction Specifications ◽  
Airport Pavement ◽  
Dry Conditions ◽  
Design Software ◽  
Aggregate Base

In 2014, the Federal Aviation Administration’s (FAA) National Airport Pavement Test Facility (NAPTF) completed construction of its flexible pavement test section, Construction Cycle 7 (CC7). Among the objectives of CC7 was to study the performance of an asphaltic drainable base pavement section compared with a P-209 aggregate base pavement section under full-scale airport loading. This research addresses the pre-traffic material characterization, full-scale traffic test data analysis and post-traffic test data analysis of these two pavement sections in dry conditions. This paper will discuss the preliminary results from laboratory testing and full-scale traffic tests for material properties which may be used in design and construction specifications to improve FAA pavement design software (FAARFIELD).

Fatigue Crack Growth at Electrical Resistance Welding Seam of API 5L X-70 Steel Line Pipe at Varied Orientations

2017 ◽  
Vol 139 (3) ◽  
Author(s):  
Craig Taylor ◽  
Sreekanta Das ◽  
Laurie Collins ◽  
Muhammad Rashid
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Base Metal ◽  
Electrical Resistance ◽  
Weld Seam ◽  
Full Scale ◽  
Resistance Welding ◽  
Line Pipe ◽  
Full Scale Testing

Very few studies have been conducted concerning fatigue in steel line pipe and fewer using full-scale testing. Further, at the time of this study, no research on full-scale testing was available in open literature regarding fatigue behavior of line pipe with longitudinal cracks, despite being considered more critical than the line pipe with cracks oriented in the circumferential direction. In the current research work, fatigue crack growth was investigated in NPS 20, API 5L X-70 grade, electrical resistance welding (ERW) straight-seam steel line pipes in the base metal and at the weld seam for various orientations. It was found that there was no significant difference between fatigue crack growth in the base metal and at the weld seam for the tested stress ratio. Increasing the angle of inclination of the crack with respect to the weld line was found to decrease the rate of fatigue crack growth due to a decrease in the mode I stress component. Finally, it was observed that despite the difference in fatigue crack growth rates, the crack aspect ratios were nearly identical for all cracks at the same crack depth.

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