[HCT] Hawaii Construction Testing Certification Exam
Preparation
**Question 1.** Which method is most commonly used to determine the air content of freshly
mixed concrete in Hawaii?
A) Pressure method (Type B meter)
B) Volumetric method for lightweight aggregates
C) Gravimetric water‑cure method
D) Oven‑dry method
Answer: A
Explanation: The pressure method using a Type B meter is the standard ASTM C231 procedure
for measuring air content in normal‑weight concrete, widely adopted in Hawaii.
**Question 2.** When sampling concrete from a revolving‑drum truck, the sample should be
taken from which location to obtain a representative mix?
A) The front of the drum
B) The middle of the drum at the discharge chute
C) The rear of the drum where concrete is most compacted
D) Any location, because the mix is homogeneous
Answer: B
Explanation: Concrete in a revolving drum is most representative at the discharge chute where
the material exits; sampling there captures the mix as it will be placed.
**Question 3.** The slump test for concrete in a tropical Hawaiian climate must be performed
at a temperature not exceeding:
A) 10 °C
B) 15 °C
C) 20 °C
D) 25 °C
Answer: D
, [HCT] Hawaii Construction Testing Certification Exam
Preparation
Explanation: Hawaii’s ambient temperatures are high; ASTM C143 permits slump testing up to
25 °C (77 °F) without correction.
**Question 4.** In calculating concrete yield, which factor is NOT considered?
A) Water loss due to evaporation
B) Aggregate moisture content
C) Air entrainment volume
D) Mixing time
Answer: D
Explanation: Yield calculations focus on material volumes and moisture; mixing time does not
affect the theoretical volume of concrete produced.
**Question 5.** Which of the following is the primary purpose of the cylinder and beam
specimens fabricated on site?
A) To verify aggregate gradation
B) To assess early-age strength development
C) To determine the concrete’s compressive and flexural strength after curing
D) To measure slump loss over time
Answer: C
Explanation: Cylinders are tested for compressive strength, while beams are used for flexural
strength, both essential for quality control.
**Question 6.** For high‑lift masonry grout, the required slump flow is typically:
A) 5–10 mm
B) 10–20 mm
C) 20–40 mm
D) 40–60 mm
, [HCT] Hawaii Construction Testing Certification Exam
Preparation
Answer: C
Explanation: High‑lift grout needs higher fluidity to flow around reinforcement and fill voids,
usually 20–40 mm slump flow.
**Question 7.** The Standard Proctor Test uses a compaction effort of:
A) 25 blows per layer with a 2.5 kg hammer
B) 56 blows per layer with a 2.5 kg hammer
C) 25 blows per layer with a 4.5 kg hammer
D) 56 blows per layer with a 4.5 kg hammer
Answer: B
Explanation: ASTM D698 (Standard Proctor) specifies 56 blows per layer using a 2.5 kg hammer
dropped from 305 mm.
**Question 8.** In Modified Proctor testing, the optimum moisture content (OMC) is generally:
A) Lower than Standard Proctor OMC
B) Higher than Standard Proctor OMC
C) Identical to Standard Proctor OMC
D) Unrelated to Standard Proctor OMC
Answer: B
Explanation: The higher compaction energy in the Modified Proctor (ASTM D1557) typically
yields a higher OMC.
**Question 9.** Which instrument is most suitable for rapid in‑place density testing of a thin
asphalt layer?
A) Nuclear density gauge
B) Sand cone apparatus
C) Core‑drill sampler
, [HCT] Hawaii Construction Testing Certification Exam
Preparation
D) Moisture‑density oven
Answer: A
Explanation: The nuclear gauge provides quick, non‑destructive density readings for thin layers,
ideal for asphalt.
**Question 10.** The Unified Soil Classification System (USCS) classifies a silty sand with low
plasticity as:
A) GW
B) SP
C) SM
D) SC
Answer: A
Explanation: GW denotes well‑graded sand with silt (low plasticity), matching the described soil.
**Question 11.** The Atterberg Liquid Limit is determined using which apparatus?
A) Casagrande cup
B) Proctor hammer
C) Nuclear gauge
D) Penetrometer
Answer: A
Explanation: The Casagrande cup method (ASTM D4318) is the standard procedure for
measuring the liquid limit.
**Question 12.** In Hawaii, volcanic “blue rock” base course material typically exhibits a
specific gravity of approximately:
A) 2.00
B) 2.45
Preparation
**Question 1.** Which method is most commonly used to determine the air content of freshly
mixed concrete in Hawaii?
A) Pressure method (Type B meter)
B) Volumetric method for lightweight aggregates
C) Gravimetric water‑cure method
D) Oven‑dry method
Answer: A
Explanation: The pressure method using a Type B meter is the standard ASTM C231 procedure
for measuring air content in normal‑weight concrete, widely adopted in Hawaii.
**Question 2.** When sampling concrete from a revolving‑drum truck, the sample should be
taken from which location to obtain a representative mix?
A) The front of the drum
B) The middle of the drum at the discharge chute
C) The rear of the drum where concrete is most compacted
D) Any location, because the mix is homogeneous
Answer: B
Explanation: Concrete in a revolving drum is most representative at the discharge chute where
the material exits; sampling there captures the mix as it will be placed.
**Question 3.** The slump test for concrete in a tropical Hawaiian climate must be performed
at a temperature not exceeding:
A) 10 °C
B) 15 °C
C) 20 °C
D) 25 °C
Answer: D
, [HCT] Hawaii Construction Testing Certification Exam
Preparation
Explanation: Hawaii’s ambient temperatures are high; ASTM C143 permits slump testing up to
25 °C (77 °F) without correction.
**Question 4.** In calculating concrete yield, which factor is NOT considered?
A) Water loss due to evaporation
B) Aggregate moisture content
C) Air entrainment volume
D) Mixing time
Answer: D
Explanation: Yield calculations focus on material volumes and moisture; mixing time does not
affect the theoretical volume of concrete produced.
**Question 5.** Which of the following is the primary purpose of the cylinder and beam
specimens fabricated on site?
A) To verify aggregate gradation
B) To assess early-age strength development
C) To determine the concrete’s compressive and flexural strength after curing
D) To measure slump loss over time
Answer: C
Explanation: Cylinders are tested for compressive strength, while beams are used for flexural
strength, both essential for quality control.
**Question 6.** For high‑lift masonry grout, the required slump flow is typically:
A) 5–10 mm
B) 10–20 mm
C) 20–40 mm
D) 40–60 mm
, [HCT] Hawaii Construction Testing Certification Exam
Preparation
Answer: C
Explanation: High‑lift grout needs higher fluidity to flow around reinforcement and fill voids,
usually 20–40 mm slump flow.
**Question 7.** The Standard Proctor Test uses a compaction effort of:
A) 25 blows per layer with a 2.5 kg hammer
B) 56 blows per layer with a 2.5 kg hammer
C) 25 blows per layer with a 4.5 kg hammer
D) 56 blows per layer with a 4.5 kg hammer
Answer: B
Explanation: ASTM D698 (Standard Proctor) specifies 56 blows per layer using a 2.5 kg hammer
dropped from 305 mm.
**Question 8.** In Modified Proctor testing, the optimum moisture content (OMC) is generally:
A) Lower than Standard Proctor OMC
B) Higher than Standard Proctor OMC
C) Identical to Standard Proctor OMC
D) Unrelated to Standard Proctor OMC
Answer: B
Explanation: The higher compaction energy in the Modified Proctor (ASTM D1557) typically
yields a higher OMC.
**Question 9.** Which instrument is most suitable for rapid in‑place density testing of a thin
asphalt layer?
A) Nuclear density gauge
B) Sand cone apparatus
C) Core‑drill sampler
, [HCT] Hawaii Construction Testing Certification Exam
Preparation
D) Moisture‑density oven
Answer: A
Explanation: The nuclear gauge provides quick, non‑destructive density readings for thin layers,
ideal for asphalt.
**Question 10.** The Unified Soil Classification System (USCS) classifies a silty sand with low
plasticity as:
A) GW
B) SP
C) SM
D) SC
Answer: A
Explanation: GW denotes well‑graded sand with silt (low plasticity), matching the described soil.
**Question 11.** The Atterberg Liquid Limit is determined using which apparatus?
A) Casagrande cup
B) Proctor hammer
C) Nuclear gauge
D) Penetrometer
Answer: A
Explanation: The Casagrande cup method (ASTM D4318) is the standard procedure for
measuring the liquid limit.
**Question 12.** In Hawaii, volcanic “blue rock” base course material typically exhibits a
specific gravity of approximately:
A) 2.00
B) 2.45
