Towards a Permanent ACN Solution for 6-Wheel Landing Gear Aircraft

Gervais, Edward; Hayhoe, Gordon F; Garg, Navneet

doi:10.1061/40711(141)4

Cited by 12 publications

(7 citation statements)

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“…In general, the B747 traffic path CBR values are higher than those in B777 traffic path. The pavement layer moduli backcalculation results based on NDT data showed similar trend (Gopalakrishnan and Thompson, 2006a) indicative of subbase and subgrade compaction resulting from trafficking.…”

Section: Low-strength Subgrade Flexible Test Pavement With Conventionsupporting

confidence: 57%

“…According to the FAA, the primary objective of the NAPTF trafficking tests was to determine the number of load applications While the medium-strength subgrade test sections were declared to be failed at the subgrade level, the LFC and LFS sections failed in the surface layers, signifying tire pressure or other upper layer failure effects, but not subgrade level failure (Gervais et al, 2003). According to Hayhoe (2004), full structural failure did not occur in the LFC and LFS test sections, probably because the subgrade material contained a significant amount of silt and the upper layers of the subgrade dried somewhat over the long period of time between construction and starting of traffic testing.…”

Section: Traffic Test Resultsmentioning

confidence: 99%

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Forensic investigation of failed airfield test pavements

Gopalakrishnan

2010

KSCE J Civ Eng

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Field and laboratory forensic studies were conducted to investigate the failure mechanisms of four different flexible test pavement sections at the Federal Aviation Administration's National Airport Pavement Test Facility (NAPTF), a state-of-the-art full scale pavement test facility dedicated solely to airport pavement research. The first set of test pavements constructed at the NAPTF included a total of nine test sections (six flexible and three rigid) built on three different subgrade materials: low-strength, mediumstrength, and high-strength. All test sections, except the high-strength test sections, were subjected to simulated repeated aircraft loading until the test sections were deemed to be failed. After the completion of traffic testing, trenches were dug in each of the flexible test sections to conduct post-traffic investigations into the failure mechanism of the pavement structures. Forensic tests conducted on the pavement component layers during trenching included CBR, in situ densities and moisture contents, and Dynamic Cone Penetrometer (DCP) tests. Heavy Weight Deflectometer (HWD) tests were conducted on the test sections before the trenches were dug. This paper focuses on trench investigations conducted on low-strength subgrade test sections. In the low-strength subgrade test sections, rutting was observed in the AC layer, unbound base and subbase layers in both the traffic paths. Shoving occurred in the AC layer.

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Section: Low-strength Subgrade Flexible Test Pavement With Conventionsupporting

confidence: 57%

Section: Traffic Test Resultsmentioning

confidence: 99%

Forensic investigation of failed airfield test pavements

Gopalakrishnan

2010

KSCE J Civ Eng

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“…Total surface rutting in both the MFC and MFS test sections was primarily contributed by the subgrade Gervais et al 2004). These observations are consistent with the conclusions drawn based on the PC-based SSR analyses for the MFC and MFS test sections.…”

Section: Medium-strength Subgrade Test Sections (Mfc and Mfs)mentioning

confidence: 98%

“…The post-traffic trenching study on the low-strength subgrade flexible test sections revealed that these test sections failed in the surface layers, signifying tire pressure or other upper layer failure effects, but not subgrade-level shear failure (Gervais et al 2004). According to Hayhoe (2004), full structural failure did not occur in the low-strength subgrade test sections, probably because the subgrade material contained a significant amount of silt and the upper layers of the subgrade dried somewhat over the long period of time between construction and starting the traffic testing.…”

Section: Low-strength Subgrade Test Sectionsmentioning

confidence: 98%

“…It is important to note that the subgrade strain criteria are used as checks on pavement surface rutting and are not specifically for subgrade rutting (NCHRP 1990). Recently, the subgrade strain failure criterion in the LEDFAA computer program (FAA airport pavement thickness design program) was updated using the NAPTF traffic test results (Gervais et al 2004;Hayhoe 2004). Bejarano and Thompson (1999) reviewed the subgrade design criteria adopted by airport agencies such as the FAA, British Airport Authority (BAA), and Transport Canada (TC) and identified the following limitations of the subgrade vertical strain criteria:…”

Section: Airport Flexible Pavement Ruttingmentioning

confidence: 99%

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Subgrade stress ratios as airfield pavement rutting performance indicators

Gopalakrishnan¹,

Thompson²

2007

Can. J. Civ. Eng.

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Rutting is a major distress in airport flexible pavements. Subgrade vertical strain criteria are used in many airport flexible pavement design procedures to consider the development of rutting. Several research studies have identified the limitations associated with these criteria. Design criteria based on subgrade stress ratios (SSRs) are being considered for evaluating subgrade rutting in airport flexible pavements. In this paper, the SSRs based on measured vertical subgrade stresses are related to surface rutting in flexible pavements subjected to repeated trafficking of Boeing 777 and 747 simulated test gears at the US Federal Aviation Administration (FAA) National Airport Pavement Test Facility (NAPTF). The results indicated overstressing of the subgrade in two test sections, and this was confirmed by trench study results. A good correlation was obtained between the SSRs and the surface rut depths, supporting the validity of developing SSR-based rutting transfer functions for airport flexible pavements serving the next generation of aircraft.

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Assessing Damage to Airport Pavement Structure due to Complex Gear Loads

Gopalakrishnan

Thompson

2006

J. Transp. Eng.

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Towards a Permanent ACN Solution for 6-Wheel Landing Gear Aircraft

Cited by 12 publications

References 0 publications

Forensic investigation of failed airfield test pavements

Forensic investigation of failed airfield test pavements

Subgrade stress ratios as airfield pavement rutting performance indicators

Assessing Damage to Airport Pavement Structure due to Complex Gear Loads

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