Asphalt concrete Quiz Questions with
Verified Answers
True - ANSWERSPlacing concrete in cold weather requires that the concrete be kept at
not less than 70°F for three days or at not less than 50°F for a duration of five days after
placement.
False - ANSWERSThe higher the water-cement ratio, the higher the resulting strength
and durability of the concrete.
False - ANSWERSSubsequent designs of the drum plant have decreased the
production rate of drum plants by using counter-airflow arrangements in which the
heated exhausts exits from the top of the drum where the aggregates are introduced.
True - ANSWERSThe primary functions of admixtures are air-entraining, water-
reducing, retarding, accelerating, and plasticizing the concrete mixture.
True - ANSWERSThe two most common dust collector systems are the water venturi
"scrubber" approach and the cloth "baghouse" filtration.
False - ANSWERSWith a pneumatic roller, the change in contact area as compaction
progresses is more dramatic than in the case of a steel wheel roller.
False - ANSWERSThe surge silos enable the batch plant to operate dependent of
immediate truck availability.
False - ANSWERSMixing should be at the highest temperature that will achieve
complete asphalt coating of the aggregates and still allow for satisfactory compaction at
the project site.
True - ANSWERSAsphalt cements serve the very important functions of bonding the
aggregate particles together, preventing the entrance of moisture, and acting as a
cushioning medium.
False - ANSWERSInternal vibrators are external vibrators attached to the outside of the
form or mold, which in turn vibrates the concrete.
False - ANSWERSAs each vibrator has an effective radius of action, vibrator insertions
should be horizontal at about 1 1/2 times the radius of action.
True - ANSWERSA tack coat acts as an adhesive to prevent slippage of the two mats.
Verified Answers
True - ANSWERSPlacing concrete in cold weather requires that the concrete be kept at
not less than 70°F for three days or at not less than 50°F for a duration of five days after
placement.
False - ANSWERSThe higher the water-cement ratio, the higher the resulting strength
and durability of the concrete.
False - ANSWERSSubsequent designs of the drum plant have decreased the
production rate of drum plants by using counter-airflow arrangements in which the
heated exhausts exits from the top of the drum where the aggregates are introduced.
True - ANSWERSThe primary functions of admixtures are air-entraining, water-
reducing, retarding, accelerating, and plasticizing the concrete mixture.
True - ANSWERSThe two most common dust collector systems are the water venturi
"scrubber" approach and the cloth "baghouse" filtration.
False - ANSWERSWith a pneumatic roller, the change in contact area as compaction
progresses is more dramatic than in the case of a steel wheel roller.
False - ANSWERSThe surge silos enable the batch plant to operate dependent of
immediate truck availability.
False - ANSWERSMixing should be at the highest temperature that will achieve
complete asphalt coating of the aggregates and still allow for satisfactory compaction at
the project site.
True - ANSWERSAsphalt cements serve the very important functions of bonding the
aggregate particles together, preventing the entrance of moisture, and acting as a
cushioning medium.
False - ANSWERSInternal vibrators are external vibrators attached to the outside of the
form or mold, which in turn vibrates the concrete.
False - ANSWERSAs each vibrator has an effective radius of action, vibrator insertions
should be horizontal at about 1 1/2 times the radius of action.
True - ANSWERSA tack coat acts as an adhesive to prevent slippage of the two mats.
