Special-Uses-Alkali - Expanded Shale & Clay

5.2. Fly Ash MixesEach of the conventional Class F fly ash mixes performed well within expectations with goodworkability and a less overall affinity for additional moisture in the batch.5.2.1. Boral Material TechnologiesThe Monticello fly ash was very workable, with a slump of 5.25 inches, air content of 2.1%, anda unit weight of 146.2 pcf. This slump was achieved at a w/c ratio of 0.44 with an additional 18pounds of water per cubic yard. The compressive strength values were 3,680 psi at 7 days, 5,710psi at 28 days and 7,510 psi at 56 days. The rapid chloride permeability specimens averaged3,352 coulombs at 28 days.The Craig FACT fly ash had the same workability of the Monticello fly ash, with a slump of 5inches, air content of 2.7%, and a unit weight of 145.4 pcf. This batch also had an additional 18pounds of water added per cubic yard to bring the w/c ratio up to 0.44. The compressive strengthof this mix design was 4,090 psi at 7 days, 6,030 psi at 28 days and 7,490 psi at 56 days. Therapid chloride permeability averaged 3,026 coulombs upon testing at 28 days.5.2.2. Headwaters IncorporatedThe Coal Creek fly ash had a slump of 3.75 inches, with a w/c ratio of 0.43, air content of 2.9%,and a unit weight of 146.1 pcf. The slump had been achieved by increasing the amount of batchwater by 9 lbs/cy. The compressive strength results were 4,210 psi, 6,230 psi and 7,310 psi at 7,28 and 56 days respectively, with an average reading of 2,704 coulombs for the rapid chloridepermeability testing at 28 days.The Jim Bridger fly ash exhibited many of the same characteristics of the Coal Creek ash. Themix had a slump of 5.25 inches with a w/c ratio of 0.44 (again with addition of 18 lbs/cy ofwater), air content of 3.3%, and a unit weight of 138.2 pcf. The compressive strength of the mixat 7 days was 3,460 psi, with strengths of 5,960 psi and 7,020 psi realized at 28 and 56 days. Theaverage rapid chloride permeability level was 3,801 coulombs at 28 days.23