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Subgrade CBR Values for Alpha Factor Determination Using Data Collected at the National Airport Pavement Test Facility.
| 题名： | Subgrade CBR Values for Alpha Factor Determination Using Data Collected at the National Airport Pavement Test Facility. |
| 作者： | hayhoe, g. f. |
| 关键词： | landing gear, procedures, structural properties, material properties |
| 摘要： | Full-scale traffic test results from tests run at the Federal Aviation Administration National Airport Pavement Test Facility (NAPTF) in 2000, 2001, and 2002 with four-wheel and six-wheel landing gears have previously been combined with results from tests run by the U.S. Army Corps of Engineers in the early 1970s. The combined results were analyzed in a recent report, and updated alpha factor values were determined for four- and six-wheel gears at 10,000 coverages. The strength of the subgrades in the NAPTF test pavements was characterized by averages of CBR (California Bearing Ratio) measurements made at the surface of the subgrade before and after testing and CBR measurements made after testing at depths of one foot and two feet (30.48 cm and 60.96 cm) below the surface of the subgrade. A number of minor transcription and rounding errors were made in the original calculations of the average CBR values and, since publication of the previous report, results have become available from an additional trench opened in one of the test items. The average CBR values for the NAPTF tests are updated in this report, resulting in an increase in the computed four-wheel alpha factor of approximately 0.6 percent and a decrease in the computed six-wheel alpha factor of approximately 1.3 percent. / NOTE: Technical note. / Supplementary Notes: Sponsored by Federal Aviation Administration, Washington, DC. Office of Airport Safety and Standards. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA. |
| 报告类型： | 科技报告 |
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