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原文传递 EMAS Cold Weather Performance Investigations.

题名：	EMAS Cold Weather Performance Investigations.
作者：	B. A. Coutermarsh;
关键词：	airport runways,concrete,cellular concrete,engineered material arresting systems (emas),runway safety areas;punch tests, durability, figures, tables (data), aircraft deceleration, freeae thaw cycles;quantitative post-cycling punch tests, qualitative condi
摘要：	At some airports, Engineered Material Arresting Systems (EMAS) are used in runway safety areas at to provide a mechanism for decelerating aircraft in the event of a runway overrun. The main component of an EMAS is energy-absorbing cellular concrete material that is relatively delicate. A system of sealants, coatings, and outer layers protect the cellular concrete from environmental conditions such as weather and jet blast. A research study was conducted to ascertain an EMASs durability in cold climates where temperatures cycle between freezing and thawing. Four series of tests were performed, including (1) thermal cycling on a large-scale EMAS bed, (2) temperature and humidity cycling on 1-cubic-foot EMAS samples, (3) adhesion tests on EMAS sealant materials, and (4) durability tests on the materials that comprise the top protective layer of EMAS blocks. The large-scale EMAS bed was thermally cycled from -20 degrees F to room temperature for 20 cycles over a 9-month period. Qualitative condition assessments were performed during the cycling, and quantitative post-cycling punch tests were performed and compared to the pre-cycling punch tests. / NOTE: Final rept. / Supplementary Notes: Sponsored by Federal Aviation Administration, Washington, DC. / 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 5301 Shawnee Road, Alexandria, VA, 22312, USA.
报告类型：	科技报告