ACI Concrete Field-Testing Technician -
Grade 1 (Math Formulas) correctly
answered to pass
Density Calculation - correct answer ✔✔(Mc&m-Mm)/Vm=Density in lb/ft³
Density Calculation (example) - correct answer ✔✔(90.2 lb - 19.1 lb) / 0.500 ft³ = 142.2 lb/ft³
Concrete Yield - correct answer ✔✔Total mass of all materials batched (lb) /
Density of concrete (lb/ft³) x 27 (ft³/yd)
Concrete Yield (example) - correct answer ✔✔34,700 lb /
141.9 lb/ft³ x 27 ft³/yd = 9.06 yd³
Relative Yield - correct answer ✔✔Actual Yield (yd³) /
Design Yield (yd³) = Relative Yield
Relative Yield (example) - correct answer ✔✔9.06 yd³ /
9.00 yd³ = 1.007
Air Content - correct answer ✔✔Theoretical Density (lbs/ft³) - Actual Density (lbs/ft³) /
Theoretical Density (lbs/ft³) x 100 = Air Content %
Air Content (memory) - correct answer ✔✔(Big# - Little#) / Big# x 100
Grade 1 (Math Formulas) correctly
answered to pass
Density Calculation - correct answer ✔✔(Mc&m-Mm)/Vm=Density in lb/ft³
Density Calculation (example) - correct answer ✔✔(90.2 lb - 19.1 lb) / 0.500 ft³ = 142.2 lb/ft³
Concrete Yield - correct answer ✔✔Total mass of all materials batched (lb) /
Density of concrete (lb/ft³) x 27 (ft³/yd)
Concrete Yield (example) - correct answer ✔✔34,700 lb /
141.9 lb/ft³ x 27 ft³/yd = 9.06 yd³
Relative Yield - correct answer ✔✔Actual Yield (yd³) /
Design Yield (yd³) = Relative Yield
Relative Yield (example) - correct answer ✔✔9.06 yd³ /
9.00 yd³ = 1.007
Air Content - correct answer ✔✔Theoretical Density (lbs/ft³) - Actual Density (lbs/ft³) /
Theoretical Density (lbs/ft³) x 100 = Air Content %
Air Content (memory) - correct answer ✔✔(Big# - Little#) / Big# x 100
