By Peter Bonfield
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Extra info for American Plywood in Roof Construction: A Design Guide (BRE Report)
200 sieve Wearing course The top layer of bituminous concrete surface Binder or intermediate course The leveling or transition layer of bituminous concrete placed directly on a base course Prime coat A surface treatment of liquid bitumen applied to a nonbituminous base course before bituminous pavement is placed. Purpose is to penetrate and seal surface of base course Tack coat Bituminous emulsion or liquid bitumen placed on an existing concrete or bituminous pavement to provide good bond with the new bituminous course Marshall stability value The load in pounds causing failure in a compacted specimen of hot-mix bituminous concrete when tested in the Marshall apparatus Flow Total deformation in hundredths of of an inch at point of maximum load in the Marshall Stability Test Percent air voids That part of the compacted bitumen-aggregate mixture not occupied by aggregate or bitumen expressed in percent of total volume Percent voids filled with bitumen Percentage of voids in a compacted aggregate mass that are filled with bituminous cement P'enetration The relative hardness or consistency of an asphalt cement.
Nd surface is 15 inches for the design aircraft. From table 5-2, the required minimum thickness of the surface course is 4 inches and of the base, 9 inches. Use 4 inch asphalt concrete surface and 11 inches of 100 CBR base to provide the IS inches required above the 30 CBR subbase. (4) The required thickness of subbase is 13 inches (28 inches less 15 inches). (S) From table 3-3 it is determined that for cohesive subgrade soils, 95 percent compaction is required to 3 feet below pavement surface and 90 percent compaction to a 4-1/2- foot depth.
See EM 1110-3-137 . EM 1110-3-141 9 Apr 84 Table 5-2. ) 100-CBR Base 80-CBR Basel Surface Base Total Surface Base toEa! Florida limerock and mechanically stabilized aggregate permitted. U. S. Army Corps of Engineers 5-3 4 6 10 EM 1110-3-141 9 Apr 84 certification by the supplier that the materials meet the project specification whenever possible. b. Gradation. See table 5-3 for gradation requirements for crushed stone, gravel, and slag. Consult guide specifications for gradation of materials not included in table 5-l.
American Plywood in Roof Construction: A Design Guide (BRE Report) by Peter Bonfield