BLD 313 Exam 2 Questions and Answers |
Building Construction Systems | Complete
Solutions | Graded A++ | Construction
Management & Building Science Exam
Preparation
SECTION 1: CONCRETE CONSTRUCTION (Questions 1-14)
Q1: Portland cement Type I is used for:
A) General construction where no special properties are required
B) High early strength
C) Sulfate resistance
D) Low heat of hydration
Correct Answer: A
Rationale: Type I = general purpose. Type III (B) high early strength. Type II/V (C) sulfate
resistance. Type IV (D) low heat.
Q2: The water-cement ratio (w/c) primarily affects:
A) Concrete color
,B) Strength and durability
C) Aggregate size
D) Curing time
Correct Answer: B
Rationale: w/c ratio affects strength (lower w/c = higher strength) and durability. Color
(A) not. Aggregate (C) separate. Curing time (D) affected but not primary.
Q3: A slump test measures:
A) Compressive strength
B) Workability/consistency
C) Air content
D) Setting time
Correct Answer: B
Rationale: Slump measures consistency (workability). Strength (A) is cylinder test. Air
content (C) is pressure test. Setting time (D) is Vicat test.
Q4: Concrete compressive strength is typically tested at:
A) 7 days
B) 14 days
C) 28 days
,D) 56 days
Correct Answer: C
Rationale: Standard compressive strength test is at 28 days. 7-day (A) may be used for
early estimate.
Q5: Air-entraining admixtures are used to:
A) Increase strength
B) Improve freeze-thaw resistance
C) Accelerate setting
D) Reduce water
Correct Answer: B
Rationale: Air-entrainment improves freeze-thaw durability. Strength (A) may decrease.
Accelerating (C) is different. Water-reducing (D) is plasticizer.
Q6: The minimum concrete cover for #6 rebar in a beam exposed to weather is typically:
A) 1 inch
B) 1.5 inches
C) 2 inches
D) 3 inches
Correct Answer: C
, Rationale: ACI 318 requires minimum cover based on exposure. For #6 bar in beam
exposed to weather/earth, 2" is typical.
Q7: Proper curing of concrete involves:
A) Maintaining moisture and temperature for hydration
B) Allowing it to dry quickly
C) Adding extra water after setting
D) Exposing to sun
Correct Answer: A
Rationale: Curing maintains moisture and temperature. Drying (B) causes shrinkage
cracking. Adding water (C) not effective. Sun (D) may cause rapid drying.
Q8: A construction joint in concrete is:
A) A deliberate interruption in pouring
B) A joint to accommodate expansion
C) A joint to control cracking
D) A joint between different materials
Correct Answer: A
Rationale: Construction joint = planned interruption. Expansion joint (B) accommodates
movement. Contraction/control joint (C) controls cracking.
Building Construction Systems | Complete
Solutions | Graded A++ | Construction
Management & Building Science Exam
Preparation
SECTION 1: CONCRETE CONSTRUCTION (Questions 1-14)
Q1: Portland cement Type I is used for:
A) General construction where no special properties are required
B) High early strength
C) Sulfate resistance
D) Low heat of hydration
Correct Answer: A
Rationale: Type I = general purpose. Type III (B) high early strength. Type II/V (C) sulfate
resistance. Type IV (D) low heat.
Q2: The water-cement ratio (w/c) primarily affects:
A) Concrete color
,B) Strength and durability
C) Aggregate size
D) Curing time
Correct Answer: B
Rationale: w/c ratio affects strength (lower w/c = higher strength) and durability. Color
(A) not. Aggregate (C) separate. Curing time (D) affected but not primary.
Q3: A slump test measures:
A) Compressive strength
B) Workability/consistency
C) Air content
D) Setting time
Correct Answer: B
Rationale: Slump measures consistency (workability). Strength (A) is cylinder test. Air
content (C) is pressure test. Setting time (D) is Vicat test.
Q4: Concrete compressive strength is typically tested at:
A) 7 days
B) 14 days
C) 28 days
,D) 56 days
Correct Answer: C
Rationale: Standard compressive strength test is at 28 days. 7-day (A) may be used for
early estimate.
Q5: Air-entraining admixtures are used to:
A) Increase strength
B) Improve freeze-thaw resistance
C) Accelerate setting
D) Reduce water
Correct Answer: B
Rationale: Air-entrainment improves freeze-thaw durability. Strength (A) may decrease.
Accelerating (C) is different. Water-reducing (D) is plasticizer.
Q6: The minimum concrete cover for #6 rebar in a beam exposed to weather is typically:
A) 1 inch
B) 1.5 inches
C) 2 inches
D) 3 inches
Correct Answer: C
, Rationale: ACI 318 requires minimum cover based on exposure. For #6 bar in beam
exposed to weather/earth, 2" is typical.
Q7: Proper curing of concrete involves:
A) Maintaining moisture and temperature for hydration
B) Allowing it to dry quickly
C) Adding extra water after setting
D) Exposing to sun
Correct Answer: A
Rationale: Curing maintains moisture and temperature. Drying (B) causes shrinkage
cracking. Adding water (C) not effective. Sun (D) may cause rapid drying.
Q8: A construction joint in concrete is:
A) A deliberate interruption in pouring
B) A joint to accommodate expansion
C) A joint to control cracking
D) A joint between different materials
Correct Answer: A
Rationale: Construction joint = planned interruption. Expansion joint (B) accommodates
movement. Contraction/control joint (C) controls cracking.
