ACI Concrete Field Testing Technician -
Grade 1 (Math Formulas)
Density Calculation - ANSWERS(Mc&m-Mm)/Vm=Density in lb/ft³
Density Calculation (example) - ANSWERS(90.2 lb - 19.1 lb) / 0.500 ft³ = 142.2 lb/ft³
Concrete Yield - ANSWERSTotal mass of all materials batched (lb) /
Density of concrete (lb/ft³) x 27 (ft³/yd)
Concrete Yield (example) - ANSWERS34,700 lb /
141.9 lb/ft³ x 27 ft³/yd = 9.06 yd³
Relative Yield - ANSWERSActual Yield (yd³) /
Design Yield (yd³) = Relative Yield
Relative Yield (example) - ANSWERS9.06 yd³ /
9.00 yd³ = 1.007
Air Content - ANSWERSTheoretical Density (lbs/ft³) - Actual Density (lbs/ft³) /
Theoretical Density (lbs/ft³) x 100 = Air Content %
Air Content (memory) - ANSWERS(Big# - Little#) / Big# x 100
Air Content (example) - ANSWERS(148.9 - 141.3) / 148.9 x 100 = 5.10%
Grade 1 (Math Formulas)
Density Calculation - ANSWERS(Mc&m-Mm)/Vm=Density in lb/ft³
Density Calculation (example) - ANSWERS(90.2 lb - 19.1 lb) / 0.500 ft³ = 142.2 lb/ft³
Concrete Yield - ANSWERSTotal mass of all materials batched (lb) /
Density of concrete (lb/ft³) x 27 (ft³/yd)
Concrete Yield (example) - ANSWERS34,700 lb /
141.9 lb/ft³ x 27 ft³/yd = 9.06 yd³
Relative Yield - ANSWERSActual Yield (yd³) /
Design Yield (yd³) = Relative Yield
Relative Yield (example) - ANSWERS9.06 yd³ /
9.00 yd³ = 1.007
Air Content - ANSWERSTheoretical Density (lbs/ft³) - Actual Density (lbs/ft³) /
Theoretical Density (lbs/ft³) x 100 = Air Content %
Air Content (memory) - ANSWERS(Big# - Little#) / Big# x 100
Air Content (example) - ANSWERS(148.9 - 141.3) / 148.9 x 100 = 5.10%
