Construction Materials Exam 1 - Quiz
Solutions Questions with Correct
Answers
When an aggregate's air voids are filled with water but no moisture exists on the surface
it is a __________. - ANSWERSsaturated surface dry state
A typical value for specific gravity of a SSD sample of coarse aggregate is: -
ANSWERS2.65
A dense gradation of aggregate in a concrete/asphalt mix would - ANSWERS· Mean
aggregate is occupying most of the volume
· Reduce the amount of void space between the pieces of aggregate
· Probably be more cost effective
Dry coarse aggregate is placed in a bucket with a volume of 0.25 ft^3. The bucket
weighs 5.5 lbs when empty and when filled with coarse aggregate using a tamping rod
the weight (bucket and aggregate) is 29.5 lbs. The dry-rodded unit weight of the coarse
aggregate is - ANSWERS96 pounds per cubic foot
By definition, "Fine" aggregate particles are smaller than what sieve size? -
ANSWERSno. 4
An aggregate sample in a saturated surface dry state weighs 100 grams. After oven
drying it weighs 92 grams. The absorption of the sample is: - ANSWERS8.7%
Absorption is the moisture content of an aggregate in what moisture state? -
ANSWERSSaturated Surface Dry
A sieve that is classified as a No. 40 sieve - ANSWERShas 40 openings per lineal inch
From the list below which is the largest coarse aggregate size?
No. 8, No. 3, No. 5, No. 57 - ANSWERSno.3
Excess water in a concrete mix will - ANSWERSIncrease the shrinkage potential of
concrete
Increase permeability
Lead to a lower strength
Air entrainment is used for - ANSWERSincreasing the freeze-thaw durability of concrete
Solutions Questions with Correct
Answers
When an aggregate's air voids are filled with water but no moisture exists on the surface
it is a __________. - ANSWERSsaturated surface dry state
A typical value for specific gravity of a SSD sample of coarse aggregate is: -
ANSWERS2.65
A dense gradation of aggregate in a concrete/asphalt mix would - ANSWERS· Mean
aggregate is occupying most of the volume
· Reduce the amount of void space between the pieces of aggregate
· Probably be more cost effective
Dry coarse aggregate is placed in a bucket with a volume of 0.25 ft^3. The bucket
weighs 5.5 lbs when empty and when filled with coarse aggregate using a tamping rod
the weight (bucket and aggregate) is 29.5 lbs. The dry-rodded unit weight of the coarse
aggregate is - ANSWERS96 pounds per cubic foot
By definition, "Fine" aggregate particles are smaller than what sieve size? -
ANSWERSno. 4
An aggregate sample in a saturated surface dry state weighs 100 grams. After oven
drying it weighs 92 grams. The absorption of the sample is: - ANSWERS8.7%
Absorption is the moisture content of an aggregate in what moisture state? -
ANSWERSSaturated Surface Dry
A sieve that is classified as a No. 40 sieve - ANSWERShas 40 openings per lineal inch
From the list below which is the largest coarse aggregate size?
No. 8, No. 3, No. 5, No. 57 - ANSWERSno.3
Excess water in a concrete mix will - ANSWERSIncrease the shrinkage potential of
concrete
Increase permeability
Lead to a lower strength
Air entrainment is used for - ANSWERSincreasing the freeze-thaw durability of concrete
