Topic
Pavement classification number
About: Pavement classification number is a research topic. Over the lifetime, 23 publications have been published within this topic receiving 43 citations. The topic is also known as: PCN.
Papers
TL;DR: In this paper, the authors developed a pavement evaluation methodology based upon a multilayered elastic model and limiting stress/strain criteria which use deflection basin measurements obtained by applying a load to the pavement surface with a nondestructive testing (NDT) device.
Abstract: Research efforts at the Waterways Experiment Station have resulted in the development of a pavement evaluation methodology based upon a multilayered elastic model and limiting stress/strain criteria which use deflection basin measurements obtained by applying a load to the pavement surface with a nondestructive testing (NDT) device. Growing acceptance of the NDT methodology had led to the formulation of a comprehensive nondestructive testing and evaluation procedure for airfield pavements which has been used by and is under consideration for adoption by the Army and is also being used by the Air Force and Navy (there is presently no official DA published manual or standard for NDT, but one is currently being drafted). A testing scheme is presented for airfield pavements that includes recommendations for the number of tests, location of tests, magnitude of NDT loadings, and sensor spacings. In addition to NDT data, other information such as layer thicknesses, surface and five-day mean air temperatures, and Portland cement concrete flexural strengths are required for an accurate evaluation. The computer program BASIN has been developed to graphically and statistically analyze NDT deflection data and to select a representative deflection basin to be used for the evaluation of a pavement section. A description of the modulus backcalculation process using the computer program BISDEF is provided. The final evaluation is based upon a projection of the total number of passes of each aircraft type that a pavement will be expected to support over its design life. A method is described for determining the critical aircraft and design pass level for a given projected aircraft mixture. Allowable aircraft loads, strengthening overlay requirements, etc. are then obtained using the moduli from BISDEF and the program AIRPAVE, which compares stresses and strains within a layered system to appropriate limiting criteria. Limiting stress/strain criteria included in AIRPAVE have been calibrated with performance data to ensure consistency with current Corps of Engineers design criteria. The use and significance of the pavement classification number (PCN) determined from the allowable load rating for expressing the load-carrying capacity of a pavement by a single unique number without specifying a particular aircraft is discussed. Sample data have been used to demonstrate evaluation techniques and the presentation of results. The NDT procedure presented here provides a rapid and versatile method for determining the structural capacity of a pavement system. Rigid, flexible, and composite pavements consisting of stabilized or unstabilized layers can be evaluated by using data from a variety of commercially available NDT equipment.
9 citations
TL;DR: The International Civil Aviation Organization requires every airport that serves commercial airline operations to publish its pavement classification number (PCN) in its own aeronautical information publication as discussed by the authors, which is defined as a number expressing the bearing strength of a pavement for unrestricted operations.
Abstract: The International Civil Aviation Organization requires every airport that serves commercial airline operations to publish its pavement classification number (PCN) in its own aeronautical information publication. This number is defined as a number expressing the bearing strength of a pavement for unrestricted operations. Likewise, each airline must provide the aircraft classification number (ACN) that corresponds to each type of aircraft it operates. Only when the aircraft's ACN is less than the airport's PCN is the aircraft allowed to land with its maximum landing weight. Otherwise, the aircraft is restricted to a certain weight limit. There are two ways to determine the PCN: the using aircraft method and the technical method. Many airports chose to determine the PCN by the using aircraft method because of its simplicity. However, the technical method, which can specify the pavement structural bearing capacity more accurately, can give a more precise PCN than the using aircraft method. An in-depth descrip...
8 citations
TL;DR: In this article, the impact of new large aircraft (NLA) on airport flexible pavement versus overloading in ICAO Practice was evaluated using Hurghada, Egypt Airport air fleet composition at four annual departure levels, four standard subgrade strength categories, and adding NLA at five different percentages.
Abstract: The objective of the study is to evaluate the impact of New Large Aircraft (NLA) on airport flexible pavement versus overloading in ICAO Practice. The study is conducted using Hurghada, Egypt Airport air fleet composition at four annual departure levels, four standard subgrade strength categories, and adding NLA at five different percentages. On the basis of the results of this research, it is concluded that, The statement in ICAO Practice “the annual number of overload movement should not exceed approximately 5 per cent of total annual aircraft movement” must be re-evaluated due to many factors as new large aircraft type ,annual departures and soil characteristics which High reduction in pavement life that has an average of 8.2% of 20 years design life due to introduction of A380-800 by 5% of annual departures, occurred at 3% CBR ., and The statement in ICAO Practice “For flexible pavement occasional movement by aircraft with Aircraft Classification number (ACN) not exceeding 10 per cent above the reported Pavement Classification number (PCN) should not adversely affect the pavement” must be re-evaluated because there is no restriction for adding new large aircraft with 5% Annual departure at any annual departures, soil characteristics comparing between COMFAA 2,3 software which High reduction in pavement life that has an average of 8.2% of 20 years design life due to introduction of A380-800 by 5% of annual departures, occurred at 3% CBR.
3 citations
20 Jul 2017
TL;DR: In this paper, the authors describe the development and fine-tuning of the renewed ACN/PCN system, which is to become the standard in the upcoming years, based on a rational approach and making an extensive use of the Multi-Layer Linear Elastic Analysis (ML2EA).
Abstract: The Aircraft Classification Number/Pavement Classification Number (ACN/PCN) system is the worldwide official airfield pavement rating method. It relies on the concept of aircraft equivalency to a single-wheel load on a given pavement structure. For flexible pavements, this underlying pavement is implicitly determined by the semi-empirical California Bearing Ratio (CBR) procedure. However, new pavement design methods have emerged, based on a rational approach and making an extensive use of the Multi-Layer Linear Elastic Analysis (ML2EA). These methods are now widely used for pavement design, hence raising the issue of consistency with the ACN/PCN system. The International Civil Aviation Organization (ICAO) initiated the work aimed at renewing the ACN/PCN system by taking advantage of these new methods, thus overcoming the well-known drawbacks of the CBR procedure. This paper describes the development and the fine-tuning of this renewed ACN/PCN system, which is to become the standard in the upcoming years.
3 citations
1 Jan 1993
TL;DR: In this article, the structural detriment of multi-wheel gear assemblies of B747-400 and B777 aircraft in relation to their ACN was evaluated by means of a BISAR multi-layer analysis.
Abstract: Multi-wheel gear assemblies of future aircraft are not compatible with pavements rated in the ACN-PCN system given by the International Civil Aviation Organization (ICAO). The Aircraft Classification Number (ACN) or the aircrafts detriment exceeds the Pavement Classification Number (PCN) representing the pavements load bearing capacity. This problem is especially relevant to flexible pavements on an ultraflow subgrade strength. The paper discusses the structural detriment of multiwheel gear assemblies of B747-400 and B777 aircraft in relation to their ACN. The impact of the loads is evaluated by means a BISAR multi-layer analysis. Based on these computations and by taking ICAO's ACN for B747-400 as a reference, an estimation of B777's ACN has been made.
2 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 2 |
| 2017 | 2 |
| 2014 | 2 |
| 2013 | 3 |
| 2012 | 1 |
| 2011 | 1 |