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Table 4-9: Time of Setting*
NON-AIR-ENTRAINED CONCRETE
Mix No.
Nominal
28-day
Compressive
Strength, psi
Nominal
Percentage of
Fly Ash
Time of Setting, HR:MIN
Initial
Final
P4-43 3,000 35 6:55 8:30
P4-24 3,000 45 7:45 9:55
P4-25 3,000 55 8:45 11:20
P4-44 4,000 35 7:35 9:25
P4-26 4,000 45 7:30 9:50
P4-27 4,000 55 7:55 10:25
P4-45 5,000 35 6:30 8:15
P4-28 5,000 45 7:15 9:25
P4-29 5,000 55 7:00 9:15
AIR-ENTRAINED CONCRETE
Mix No.
Nominal
28-day
Compressive
Strength, psi
Nominal
Percentage of
Fly Ash
Time of Setting, HR:MIN
Initial
Final
P4-46 3,000 35 6:40 8:40
P4-47 3,000 45 8:15 10:25
P4-38 3,000 55 7:15 9:45
P4-48 4,000 35 7:30 9:45
P4-39 4,000 45 6:40 9:10
P4-40 4,000 55 6:55 9:30
P4-49 5,000 35 6:45 8:20
P4-41 5,000 45 7:30 9:40
P4-42 5,000 55 5:40 7:10
* Determined in accordance with ASTM Designation: C-403-85 Time of Setting of Concrete
Mixtures by Penetration Resistance
The final setting time for 4000 psi and 5000 psi concrete showed much less
increase with increase in fly ash content. The 5000 psi concrete with 55% fly
ash content actually showed a decrease by 10 minutes for final setting time
compared to 5000 psi concrete with 45% fly ash content.
The initial and final setting time for air-entrained concrete is also shown on
Table 4-9. It can be seen from the results that the initial and final setting time
for air-entrained fly ash concrete is not significantly different as the fly ash
replacement is increased to levels of 55% for the 3,000; 4,000; and 5,000 psi
concrete.
We Energies 66
Coal Combustion Products
Utilization Handbook