Document pmwjjqNEwaBzEyROYaMwqyO87

MEMORANDUM To Distribution From P. Hoye - BBH Date December 19, 1977 Subject ACCELERATED WEATHERING OF COATING ASPHALTS Distribution: Mr. Hixon - BB Dr. Schnizer - BE Mr. Clay - MB Mr. Colvin - MS Mr. Suva - MP Mr. Davis - PK Mr. Dickinson - PJ Mr. Price - PICL Mr. Peacock - PJL Pacific Division Mr. Me Clung Mr. McAnulty Mr. Koopmann Mr. Wood - BBR Mr. Homan - BBQ Mr. Marsh - MK Mr. Miller - MJ Mr. Reber - PB Mr. Burris - PS Mr. Clark - PBL Mr. Kirklin - PSL Mr. Fitzpatrick Mr. Keyser Mr. Costa Accelerated weather testing of unfilled and filled asphalts representing the coatings being used by the various mills during early 1977 have been completed. The tests were run on 30 to 33 mil coatings applied to aluminum panels. The weathering took place in a Model DMCR Weather-Ometer according to ASTM D529-62, Cycle A. Cycles to failure were as follows: Unfilled Coatings 53% Filled Coatings FJ 59 FK 45 FB 45 FM 40 FS 33 FW 30 FO 30 FJ 129 FK 129 FB 86 FS 67 FW 67 FM 49 FO 40 Conclusions: 1. Unfilled FO coating leads the other asphalts in durability by a decisive margin. When filled, it shows an outstanding performance which is matched by the filled version of the FK coating. 2. The results obtained from the FB coating, both unfilled and filled, are typical of what we expect from an average satisfactory coating. 3. The FM coating, based on Sultinate of Oman asphalt weathered reasonably well when not filled, but showed no appreciable enhancement in durability from the presence of filler. 4. The catalysed<Iatar asphalt used at FO had the poorest performance. Later in the year, it was replaced by asphalt from Oman. /)/' //BBH Book 246, pp. 18 and 19 BIRD 010993 ASPHALT COATING DURABILITY - CYCLES TO FAILURE IN AWT Norwood Exxon/Shell Venezuela Average Filler Wilmington Edgerton California Average Filler Martinez Shell Sultinate of Oman , Average Filler Charleston Exxon Venezuela Average Filler Perth Amboy Trumbull Venezuela Average Filler Port!and Shel I Qatar Catalysed Average Filler Shreveport East Texas/Arkansas Average Filler S.P. O.F. 220 230 220 228 227 220 230 Pen 0.1mm 19.5 18 18 18 18 20 16 Unfilled 53% Filled Sample Cycles Sample Cycles 927-1 45 928 86 -2 45 FBW Dust 929-1 -2 30 930 67 30 30 3M Filler 931-1 40 932 49 -2 40 W Limestone 933-1 -2 45 934 129 45 3F FKW Dust 935-1 -2 61 936 129 57 59 GAF B65 937-1 30 938 40 -2 30 30 Limestone 939-1 -2 33 940 67 33 51 Glenwood IP-11^77 BIRD 010994