1
CM 2113 Wang Test 2 Actual Exam 2026/2027:
Questions and All Correct Answers | 100% Solved and
Guaranteed Success for Construction Management –
Pass Guaranteed - A+ Graded
Section 1: Concrete Materials & Properties (12 Questions)
Q1: A concrete mix design specifies a water-cement ratio of 0.45 for a foundation slab exposed
to moderate sulfate soil conditions. Which type of Portland cement is most appropriate per
ASTM C150?
A. Type I (Normal) - general construction
B. Type II (Moderate Sulfate Resistance) - moderate sulfate resistance with moderate heat of
hydration [CORRECT]
C. Type III (High Early Strength) - rapid strength development
D. Type V (High Sulfate Resistance) - severe sulfate exposure
Correct Answer: B
Rationale: Type II cement provides moderate sulfate resistance (C3A content ≤8%) suitable for
moderate sulfate exposure, along with moderate heat of hydration beneficial for mass concrete
foundations. Type I (A) lacks sulfate resistance. Type III (C) is for rapid strength, not sulfate.
Type V (D) is for severe sulfate conditions (C3A ≤5%), over-specified for moderate exposure
and more expensive.
Q2: [CALCULATION] A concrete mix requires 600 lbs of cement per cubic yard. The specified
water-cement ratio is 0.50. How many gallons of water are needed per cubic yard? (Water
weighs 8.33 lbs/gallon)
A. 24 gallons
B. 30 gallons
C. 36 gallons [CORRECT]
D. 48 gallons
Correct Answer: C
Rationale: Calculation: Water = w/c ratio × cement weight = 0.50 × 600 lbs = 300 lbs water.
Gallons = 300 lbs ÷ 8.33 lbs/gallon = 36 gallons. This is standard mix design calculation for
,2
determining batch water requirements. Options A, B, and D represent calculation errors or
incorrect unit conversions.
Q3: Which admixture would be most appropriate for a concrete placement during hot weather
conditions (ambient temperature 95°F) where extended workability is needed?
A. Calcium chloride accelerator
B. High-range water reducer (superplasticizer)
C. Retarding admixture [CORRECT]
D. Air-entraining admixture
Correct Answer: C
Rationale: Retarding admixtures delay cement hydration, extending setting time and maintaining
workability in hot weather where rapid evaporation and hydration reduce placement time.
Accelerators (A) worsen the problem. Superplasticizers (B) increase workability but don't delay
set. Air-entrainment (D) improves freeze-thaw resistance but doesn't address hot weather
workability.
Q4: [MATERIAL COMPARISON] Which aggregate characteristic has the GREATEST effect on
concrete workability?
A. Aggregate specific gravity
B. Aggregate gradation (particle size distribution) [CORRECT]
C. Aggregate mineral composition
D. Aggregate source location
Correct Answer: B
Rationale: Aggregate gradation (distribution of particle sizes) most significantly affects
workability. Well-graded aggregates (variety of sizes) reduce void content, minimize cement
paste requirements, and improve workability compared to gap-graded or uniformly graded
aggregates. Specific gravity (A) affects weight but not workability directly. Mineralogy (C)
affects strength and durability. Source (D) is irrelevant to performance.
Q5: A concrete cylinder test shows compressive strength of 4,500 psi at 28 days. The specified
strength was 4,000 psi. What does this indicate per ACI 318?
A. The concrete is defective and must be removed
B. The concrete meets specification; individual tests may exceed specified strength [CORRECT]
C. The mix design must be revised to reduce cement content
, 3
D. The testing laboratory made an error
Correct Answer: B
Rationale: ACI 318 requires average of three consecutive tests to equal or exceed specified
strength, with no individual test more than 500 psi below specified. A single test exceeding
specified strength indicates acceptable concrete with appropriate safety margin. Removal (A) is
unwarranted. Cement reduction (C) is not required. Testing error (D) is unlikely without
evidence.
Q6: [DEFECT IDENTIFICATION] A concrete wall shows voids and pockets where aggregate is
visible but cement paste is missing. What is this defect called?
A. Scaling
B. Spalling
C. Honeycombing [CORRECT]
D. Crazing
Correct Answer: C
Rationale: Honeycombing: voids/pockets where coarse aggregate is visible without surrounding
mortar, caused by inadequate consolidation (vibration), improper mix workability, or leakage at
form joints. Scaling (A) is surface flaking. Spalling (B) is deeper surface breaking. Crazing (D)
is fine surface cracking. Honeycombing requires repair by chipping out and patching.
Q7: Which pozzolan addition to concrete provides the greatest improvement in long-term
strength and permeability reduction?
A. Class F fly ash (low-calcium)
B. Class C fly ash (high-calcium)
C. Silica fume [CORRECT]
D. Ground granulated blast-furnace slag
Correct Answer: C
Rationale: Silica fume (microsilica) has extreme fineness (particles 100× smaller than cement)
and high silica content, providing: (1) microfiller effect densifying paste, (2) pozzolanic reaction
consuming Ca(OH)2, and (3) greatest reduction in permeability and increase in long-term
strength. Fly ash (A, B) and slag (D) provide benefits but silica fume is most effective for high-
performance concrete.
Q8: [TESTING] A concrete slump test shows the concrete slumps 3 inches, then shears off and
loses 1.5 inches of height. What does this indicate?
CM 2113 Wang Test 2 Actual Exam 2026/2027:
Questions and All Correct Answers | 100% Solved and
Guaranteed Success for Construction Management –
Pass Guaranteed - A+ Graded
Section 1: Concrete Materials & Properties (12 Questions)
Q1: A concrete mix design specifies a water-cement ratio of 0.45 for a foundation slab exposed
to moderate sulfate soil conditions. Which type of Portland cement is most appropriate per
ASTM C150?
A. Type I (Normal) - general construction
B. Type II (Moderate Sulfate Resistance) - moderate sulfate resistance with moderate heat of
hydration [CORRECT]
C. Type III (High Early Strength) - rapid strength development
D. Type V (High Sulfate Resistance) - severe sulfate exposure
Correct Answer: B
Rationale: Type II cement provides moderate sulfate resistance (C3A content ≤8%) suitable for
moderate sulfate exposure, along with moderate heat of hydration beneficial for mass concrete
foundations. Type I (A) lacks sulfate resistance. Type III (C) is for rapid strength, not sulfate.
Type V (D) is for severe sulfate conditions (C3A ≤5%), over-specified for moderate exposure
and more expensive.
Q2: [CALCULATION] A concrete mix requires 600 lbs of cement per cubic yard. The specified
water-cement ratio is 0.50. How many gallons of water are needed per cubic yard? (Water
weighs 8.33 lbs/gallon)
A. 24 gallons
B. 30 gallons
C. 36 gallons [CORRECT]
D. 48 gallons
Correct Answer: C
Rationale: Calculation: Water = w/c ratio × cement weight = 0.50 × 600 lbs = 300 lbs water.
Gallons = 300 lbs ÷ 8.33 lbs/gallon = 36 gallons. This is standard mix design calculation for
,2
determining batch water requirements. Options A, B, and D represent calculation errors or
incorrect unit conversions.
Q3: Which admixture would be most appropriate for a concrete placement during hot weather
conditions (ambient temperature 95°F) where extended workability is needed?
A. Calcium chloride accelerator
B. High-range water reducer (superplasticizer)
C. Retarding admixture [CORRECT]
D. Air-entraining admixture
Correct Answer: C
Rationale: Retarding admixtures delay cement hydration, extending setting time and maintaining
workability in hot weather where rapid evaporation and hydration reduce placement time.
Accelerators (A) worsen the problem. Superplasticizers (B) increase workability but don't delay
set. Air-entrainment (D) improves freeze-thaw resistance but doesn't address hot weather
workability.
Q4: [MATERIAL COMPARISON] Which aggregate characteristic has the GREATEST effect on
concrete workability?
A. Aggregate specific gravity
B. Aggregate gradation (particle size distribution) [CORRECT]
C. Aggregate mineral composition
D. Aggregate source location
Correct Answer: B
Rationale: Aggregate gradation (distribution of particle sizes) most significantly affects
workability. Well-graded aggregates (variety of sizes) reduce void content, minimize cement
paste requirements, and improve workability compared to gap-graded or uniformly graded
aggregates. Specific gravity (A) affects weight but not workability directly. Mineralogy (C)
affects strength and durability. Source (D) is irrelevant to performance.
Q5: A concrete cylinder test shows compressive strength of 4,500 psi at 28 days. The specified
strength was 4,000 psi. What does this indicate per ACI 318?
A. The concrete is defective and must be removed
B. The concrete meets specification; individual tests may exceed specified strength [CORRECT]
C. The mix design must be revised to reduce cement content
, 3
D. The testing laboratory made an error
Correct Answer: B
Rationale: ACI 318 requires average of three consecutive tests to equal or exceed specified
strength, with no individual test more than 500 psi below specified. A single test exceeding
specified strength indicates acceptable concrete with appropriate safety margin. Removal (A) is
unwarranted. Cement reduction (C) is not required. Testing error (D) is unlikely without
evidence.
Q6: [DEFECT IDENTIFICATION] A concrete wall shows voids and pockets where aggregate is
visible but cement paste is missing. What is this defect called?
A. Scaling
B. Spalling
C. Honeycombing [CORRECT]
D. Crazing
Correct Answer: C
Rationale: Honeycombing: voids/pockets where coarse aggregate is visible without surrounding
mortar, caused by inadequate consolidation (vibration), improper mix workability, or leakage at
form joints. Scaling (A) is surface flaking. Spalling (B) is deeper surface breaking. Crazing (D)
is fine surface cracking. Honeycombing requires repair by chipping out and patching.
Q7: Which pozzolan addition to concrete provides the greatest improvement in long-term
strength and permeability reduction?
A. Class F fly ash (low-calcium)
B. Class C fly ash (high-calcium)
C. Silica fume [CORRECT]
D. Ground granulated blast-furnace slag
Correct Answer: C
Rationale: Silica fume (microsilica) has extreme fineness (particles 100× smaller than cement)
and high silica content, providing: (1) microfiller effect densifying paste, (2) pozzolanic reaction
consuming Ca(OH)2, and (3) greatest reduction in permeability and increase in long-term
strength. Fly ash (A, B) and slag (D) provide benefits but silica fume is most effective for high-
performance concrete.
Q8: [TESTING] A concrete slump test shows the concrete slumps 3 inches, then shears off and
loses 1.5 inches of height. What does this indicate?
