Accession Number : ADA185176

Title :   Optimize Freeze-Thaw Design of ALRS (Alternate Launch and Recovery Surface).

Descriptive Note : Final rept. Oct 83-Nov 84,

Corporate Author : AIR FORCE ENGINEERING AND SERVICES CENTER TYNDALL AFB FL ENGINEERING AND SERV ICES LAB

Personal Author(s) : Berg, Richard L

PDF Url : ADA185176

Report Date : Aug 1987

Pagination or Media Count : 56

Abstract : This report documents research to develop concepts for structurally designing ALRS for use in areas that experience seasonal frost. Three test sections were designed, constructed, and traffic-tested to failure One test section, constructed using about 3.3 inches of asphaltic concrete pavement, 10.5 inches of crushed stone base course, and 10.5 inches of crushed shoulder stone subbase above the delay subgrade, sustained about 10 percent more coverage with the F-15 loadcart than the minimum operational requirements. The other two test sections failed to meet the minimum operational requirements. The traffic tests were conducted after the test section had undergone two freeze-thaw cycles. Frost penetrated into the clay subgrade about 15 inches during both freezing cycles. A revised design procedure for ALRS pavements in cold regions is recommended. The revised procedure will cause thicker ALRS pave ments than previously planned.

Descriptors :   *PAVEMENTS, *FREEZING, *THAWING, LOW STRENGTH, CYCLES, SEASONAL VARIATIONS, COLD REGIONS, LANDING FIELDS, GROUND TRAFFIC, FAILURE(MECHANICS), CONCRETE, CLAY, CONSTRUCTION MATERIALS, THICKNESS, FROST, PENETRATION, GROUND SUPPORT EQUIPMENT, LAUNCHING, RECOVERY

Subject Categories : Civil Engineering
      Terminal Flight Facilities
      Construction Equipment, Materials & Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE