TEST 1(A) Flashcards
Reinforcing steel is coated with epoxy primarily to_______of the steel.
a. prevent corrosion
b. improve electric conductivity
c. increase the tensile strength
d. increase the compressive strength
a. prevent corrosion
Specifications for concrete require that concrete shall reach or exceed the design strength at the end of days.
a.14
b.21
c.28
d.35
c. 28
A #G reinforcing bar has a cross-section area of square inches.
a. 0.44
b. 0.48
c. 0.52
d. 0.56
A. 0.44
Mixing time for concrete which is measured from the time all ingredients are in the drum should be at least 1.5 minutes for a one cubic yard mixer plus 0.5 minutes for each cubic yard of capacity over one cubic yard. The MINIMUM time to mix 7 cubic yards is, in minutes,
a. 3.0
b. 3.5
c. 4.0
d. 4.5
d. 4.5
It is recommended that a maximum limit be set on mixing time for machine-mixed-concrete because overmixing may remove entrained air and
a. increase the water/cement ratio
b. increase the amount of fine aggregates in the concrete mixture
c. the concrete mix may set permanently
d. cause excess water to rise in the placed concrete causing alligator cracks in the surface
b. increase the amount of fine aggregates in the concrete mixture
ADD QUESTION 6 FROM TEST 1 (A)
Keep going, you got this!
ADD QUESTION 8 FROM TEST 1 (A)
Of the following properties of polymer concrete that make it attractive for maintenance of Portland cement concrete roadways, the one that is MOST important is
a. light weight
b. immunity to corrosion
c. resistance to abrasion
d. rapid hardening qualities
d. rapid hardening qualities
A gallon of water weighs most nearly ____ pounds.
a. 7.53
b. 8.33
c. 9.13
d. 9.53
B. 8.33
Air- entrained concrete is used in concrete roadways primarily to
a. reduce the weight of the concrete
b. prevent corrosion of the steel reinforcement in the concrete
c. make the concrete less porous to the intrusion of water in the concrete
d. resist damage to the roadway due to freezing and thawing.
d. resist damage to the roadway due to freezing and thawing.
The slump test in concrete is used to test its
A. air content
B. workability
C. porosity
D. uniformity
B. workability
The criterion for water that is to be used for mixing concrete is that it should be potable. This means that the water should
A. have high turbidity
B. should be hard
C. contain no sulfates
D. be fit for human consumption
D. be fit for human consumption
A test that can be used on an asphalt roadway to measure changes in hardness due to age hardening is a test.
A. ductility
B. viscosity
C. ring and ball softening point
D. penetration
D. penetration
A densely graded bituminous mixture is called a large stone mix if the nominal size of aggregates is equal to or greater than a minimum of
A. 1 inch
B. 1 1/4 inches
C. 1 1/2 inches
D. 1 3/4 inches
A. 1 inch
The specifications state that the surface on which the bituminous material is applied must have a temperature of 20°C or higher. 20°C is, in degrees Fahrenheit,
A. 62°
B. 64°
C. 66°
D. 68°
D. 68°
The largest size aggregate in sheet asphalt is usually
A. 1/8 inch
B. 1/4 inch
C. 3/8 inch
D. 1/2 inch
B. 1/4inch
Sheet asphalt is used mainly in
A. rural areas
B. major highways
C. overpasses
D. city streets
D. City Streets
Of the following, a slurry seal is NOT used on a bituminous pavement to
A. fill potholes
B. fill cracks
C. repair raveling asphalt pavement
D. provide a skid-resistant surface
A. Fill potholes
Pozzolan is a siliceous material. Another example of a siliceous material is A. clay
B. limestone
C. granite
D. sand
D. Sand
The primary purpose of a tack coat that precedes the application of a bituminous mix on an existing surface is to
A. remove dust from the existing surface
B. fill in cracks in the existing surface
c. allow the new mixture to adhere to the existing surface
d. prevent the asphalt in the bituminous paving material from seeping into the existing pavement.
c. allow the new mixture to adhere to the existing surface
The lowest temperature at which asphalt pavements should be laid is
A. 30F
B. 40F
C. 50F
D. 60F
b. 40F
Steam will rise from an asphalt mix when it is dumped into the hopper of a paver if
A. there is too little asphalt in the mix
b. excess moisture is present in the mix
c. the mix is too hot
d. there is an excess of asphalt in the mix
b. excess moisture is present in the mix
The number of millimeters in an inch is MOST NEARLY
A. 20
B. 25
C. 30
D. 35
B. 25
The number of inches in a meter is MOST NEARLY
A. 39.37
B. 39.57
C. 39.77
D. 39.97
A. 39.37
