Concrete Field Inspector Flashcards
7 cards from real CTQP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Concrete Field Inspector flashcards as text
According to ASTM C31, what is the required curing temperature range for standard-cured concrete cylinders?
Answer: 60°F to 80°F (16°C to 27°C)
ASTM C31 requires standard-cured cylinders to be maintained at 60°F to 80°F (16°C to 27°C) during initial curing.
What does the term 'bleed water' refer to in concrete?
Answer: Water that rises to the surface due to settlement of solids
Bleed water is the water that migrates to the top surface of freshly placed concrete as the heavier solid particles settle.
Which ASTM standard governs the sampling of fresh concrete?
Answer: ASTM C172
ASTM C172 is the standard practice for sampling freshly mixed concrete from the point of delivery.
When testing air content by the pressure method (ASTM C231), which aggregate type makes this method NOT applicable?
Answer: Lightweight aggregate
The pressure method cannot be used with lightweight or porous aggregates because they absorb air pressure, giving inaccurate readings.
A concrete load arrives at 8:00 AM and mixing began at 7:00 AM. Under ASTM C94, what is the latest this concrete can be discharged?
Answer: 9:00 AM
ASTM C94 requires concrete to be discharged within 90 minutes of mixing or before the drum has revolved 300 times, whichever comes first.
What is the minimum number of composite samples that should be taken to make one set of test cylinders per ASTM C172?
Answer: 3
ASTM C172 requires the composite sample to be obtained from at least three approximately equal portions taken throughout the middle portion of the load.
During hot weather concreting, which factor most directly increases the rate of slump loss?
Answer: Higher concrete temperature
Higher concrete temperature accelerates cement hydration and evaporation, both of which cause more rapid slump loss.