COSC 253 Final Exam with all Correct & 100% Verified
Answers |Actual Complete Exam |Already Graded A+
Name the 3 main basic ingredients for making concrete material. ✔Correct Answer-1)
Portland Cement
2) Aggregates
3) Water
Which Cement type would you recommend for the following construction applications. Write
your answer in Roman numerals.
a) Construction of a sidewalk in College Station TX.
b) Sidewalk in Burlington Vermont during February.
c) Reinforced concrete building on campus during the Fall.
d) Concrete dam in Colorado state during the Summer.
e) Columns for ocean front pier in Galveston.
f) Foundation footings in contact with soil having a sulfate concentration of 3489 ppm.
g) Fast track construction of parking garage in Dallas. ✔Correct Answer-a) I
b) III
c) I
d) IV
e) II
f) V
g) III
The largest aggregate size should not exceed__________of the spacing between steel
reinforcement. ✔Correct Answer-3/4
Admixtures are added ingredients that alter or improve a specific property of either fresh or
hydrated concrete. ✔Correct Answer-T
Set retarders are a commonly used admixture to improve the freeze-thaw durability of concrete.
✔Correct Answer-F
Water reducers are commonly used to reduce the water content of concrete mixture thus
diminishing the w/c of the mix. ✔Correct Answer-T
Materials added to concrete as a partial substitute for Portland cement are called. ✔Correct
Answer-Supplementary Cementitious Materials (SCM)
Select all that apply for the use of SCMs in concrete. ✔Correct Answer-1) Increased strength
2) Increased durability
, 3) Improved workability
4) Lowers the embodied carbon of concrete
Calculate the amount of concrete needed (in cubic yards) to pour a 10 inch thick slab. The
dimensions of the slab are 25 feet by 25 feet. ✔Correct Answer-20
High-strength concrete is desirable for use in fast-track construction to achieve higher earlier
strength. ✔Correct Answer-T
High strength concrete is categorized as concrete having a compressive strength superior to
6000psi at 28 days. ✔Correct Answer-T
High strength concrete is made using standard concrete materials and seldom requires the use
of admixtures nor SCMs. ✔Correct Answer-F
Concrete strength varies with the design of the mixture and its ingredients. ✔Correct Answer-
T
Conventional or normal strength concrete is typically below 6000psi at 28day strength.
✔Correct Answer-T
A compression test is preformed on prism specimens ✔Correct Answer-F
Rule of thumb, depending on the conditions and mixture design, concrete can placed up to 90
minutes after mixing commences. ✔Correct Answer-T
Select all that apply, if a physical barrier is present, concrete can be placed with the aid of:
✔Correct Answer-1) crane-lifted buckets
2) pump truck
3) power buggies
The goal of consolidating concrete is to remove entrapped air in concrete preventing air voids
within the concrete once hardened. ✔Correct Answer-T
Select all that apply. Common methods used for consolidating concrete are: ✔Correct
Answer-1) Tamping
2) Rodding
3) Vibration
Typically finishing steps start before surface bleeding starts. ✔Correct Answer-F
During finishing of concrete, surface textures are not of importance, only ensuring that the
concrete is flat is of importance. ✔Correct Answer-F
Answers |Actual Complete Exam |Already Graded A+
Name the 3 main basic ingredients for making concrete material. ✔Correct Answer-1)
Portland Cement
2) Aggregates
3) Water
Which Cement type would you recommend for the following construction applications. Write
your answer in Roman numerals.
a) Construction of a sidewalk in College Station TX.
b) Sidewalk in Burlington Vermont during February.
c) Reinforced concrete building on campus during the Fall.
d) Concrete dam in Colorado state during the Summer.
e) Columns for ocean front pier in Galveston.
f) Foundation footings in contact with soil having a sulfate concentration of 3489 ppm.
g) Fast track construction of parking garage in Dallas. ✔Correct Answer-a) I
b) III
c) I
d) IV
e) II
f) V
g) III
The largest aggregate size should not exceed__________of the spacing between steel
reinforcement. ✔Correct Answer-3/4
Admixtures are added ingredients that alter or improve a specific property of either fresh or
hydrated concrete. ✔Correct Answer-T
Set retarders are a commonly used admixture to improve the freeze-thaw durability of concrete.
✔Correct Answer-F
Water reducers are commonly used to reduce the water content of concrete mixture thus
diminishing the w/c of the mix. ✔Correct Answer-T
Materials added to concrete as a partial substitute for Portland cement are called. ✔Correct
Answer-Supplementary Cementitious Materials (SCM)
Select all that apply for the use of SCMs in concrete. ✔Correct Answer-1) Increased strength
2) Increased durability
, 3) Improved workability
4) Lowers the embodied carbon of concrete
Calculate the amount of concrete needed (in cubic yards) to pour a 10 inch thick slab. The
dimensions of the slab are 25 feet by 25 feet. ✔Correct Answer-20
High-strength concrete is desirable for use in fast-track construction to achieve higher earlier
strength. ✔Correct Answer-T
High strength concrete is categorized as concrete having a compressive strength superior to
6000psi at 28 days. ✔Correct Answer-T
High strength concrete is made using standard concrete materials and seldom requires the use
of admixtures nor SCMs. ✔Correct Answer-F
Concrete strength varies with the design of the mixture and its ingredients. ✔Correct Answer-
T
Conventional or normal strength concrete is typically below 6000psi at 28day strength.
✔Correct Answer-T
A compression test is preformed on prism specimens ✔Correct Answer-F
Rule of thumb, depending on the conditions and mixture design, concrete can placed up to 90
minutes after mixing commences. ✔Correct Answer-T
Select all that apply, if a physical barrier is present, concrete can be placed with the aid of:
✔Correct Answer-1) crane-lifted buckets
2) pump truck
3) power buggies
The goal of consolidating concrete is to remove entrapped air in concrete preventing air voids
within the concrete once hardened. ✔Correct Answer-T
Select all that apply. Common methods used for consolidating concrete are: ✔Correct
Answer-1) Tamping
2) Rodding
3) Vibration
Typically finishing steps start before surface bleeding starts. ✔Correct Answer-F
During finishing of concrete, surface textures are not of importance, only ensuring that the
concrete is flat is of importance. ✔Correct Answer-F
