Quiz_________________?
A 6 by 12 in. [150 mm by 300 mm] cylinder mold can be used for concrete containing
aggregate with particles not exceeding _____ in size, without the need for wet sieving the
concrete. -
Answer✅
2 in. [50 mm]
Quiz_________________?
A mallet weighing _____ must be used to tap the sides of the bowl after rodding each layer.
-
Answer✅
1.25 ± 0.50 lb. (600 ± 200 g)
Quiz_________________?
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or
False? -
Answer✅
False
1
, Quiz_________________?
A plastic container can be used for the measure in this method. True or False? -
Answer✅
False, measure must be steel or other suitable metal
Quiz_________________?
After completing the strike-off procedure, what must be done before weighing the measure
and sample? -
Answer✅
Clean off any excess concrete
Quiz_________________?
After consolidation of the final layer, an excess of concrete _____ above the top of the
measure is considered optimum. -
Answer✅
⅛ in. [3 mm]
Quiz_________________?
After molding test specimens, you should wait two hours before moving them to the
location of initial storage. True or False? -
Answer✅
False; the specimens must be moved immediately
Quiz_________________?
2
, After rodding each layer, what should be done to the measure before adding another layer
of concrete? -
Answer✅
Tap the sides of the measure smartly 10 to 15 times with the mallet
Quiz_________________?
After the final rodding, the sides of the slump mold should be tapped lightly with the
tamping rod. True or False? -
Answer✅
False
Quiz_________________?
Air Content Calculation
Your air meter has been damaged in transit to the job site. You do, however, possess the
theoretical density that was determined in the lab; it is 151.4 lb/ft3 (2425 kg/m3). Using the
density calculated in Question 21, calculate the air content of the batch (in percentage). -
Answer✅
5.0% = [(151.4 lb/ft3 - 143.9 lb/ft3) / 151.4 lb/ft3] × 100
5.0% = [(2425 kg/m3 - 2305 kg/m3) / 2425 kg/m3] × 100
Quiz_________________?
Air meter bowls used for this test must conform to ASTM _____ and be calibrated for
volume according
to ASTM _____. -
Answer✅
C231, C29
3
, Quiz_________________?
ASTM C1064 -
Answer✅
Standard Test Method For Temperature of Freshly Mixed Hydraulic-Cement Concrete
Quiz_________________?
ASTM C138 -
Answer✅
Standard Test Method for Density (Unit Weight),
Yield, and Air Content (Gravimetric) of Concrete
Quiz_________________?
ASTM C143 -
Answer✅
Standard Test Method for Slump of Hydraulic-Cement Concrete
Quiz_________________?
ASTM C172 -
Answer✅
Standard Practice for Sampling Freshly Mixed Concrete
Quiz_________________?
ASTM C173 -
4
A 6 by 12 in. [150 mm by 300 mm] cylinder mold can be used for concrete containing
aggregate with particles not exceeding _____ in size, without the need for wet sieving the
concrete. -
Answer✅
2 in. [50 mm]
Quiz_________________?
A mallet weighing _____ must be used to tap the sides of the bowl after rodding each layer.
-
Answer✅
1.25 ± 0.50 lb. (600 ± 200 g)
Quiz_________________?
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or
False? -
Answer✅
False
1
, Quiz_________________?
A plastic container can be used for the measure in this method. True or False? -
Answer✅
False, measure must be steel or other suitable metal
Quiz_________________?
After completing the strike-off procedure, what must be done before weighing the measure
and sample? -
Answer✅
Clean off any excess concrete
Quiz_________________?
After consolidation of the final layer, an excess of concrete _____ above the top of the
measure is considered optimum. -
Answer✅
⅛ in. [3 mm]
Quiz_________________?
After molding test specimens, you should wait two hours before moving them to the
location of initial storage. True or False? -
Answer✅
False; the specimens must be moved immediately
Quiz_________________?
2
, After rodding each layer, what should be done to the measure before adding another layer
of concrete? -
Answer✅
Tap the sides of the measure smartly 10 to 15 times with the mallet
Quiz_________________?
After the final rodding, the sides of the slump mold should be tapped lightly with the
tamping rod. True or False? -
Answer✅
False
Quiz_________________?
Air Content Calculation
Your air meter has been damaged in transit to the job site. You do, however, possess the
theoretical density that was determined in the lab; it is 151.4 lb/ft3 (2425 kg/m3). Using the
density calculated in Question 21, calculate the air content of the batch (in percentage). -
Answer✅
5.0% = [(151.4 lb/ft3 - 143.9 lb/ft3) / 151.4 lb/ft3] × 100
5.0% = [(2425 kg/m3 - 2305 kg/m3) / 2425 kg/m3] × 100
Quiz_________________?
Air meter bowls used for this test must conform to ASTM _____ and be calibrated for
volume according
to ASTM _____. -
Answer✅
C231, C29
3
, Quiz_________________?
ASTM C1064 -
Answer✅
Standard Test Method For Temperature of Freshly Mixed Hydraulic-Cement Concrete
Quiz_________________?
ASTM C138 -
Answer✅
Standard Test Method for Density (Unit Weight),
Yield, and Air Content (Gravimetric) of Concrete
Quiz_________________?
ASTM C143 -
Answer✅
Standard Test Method for Slump of Hydraulic-Cement Concrete
Quiz_________________?
ASTM C172 -
Answer✅
Standard Practice for Sampling Freshly Mixed Concrete
Quiz_________________?
ASTM C173 -
4
