ACI Concrete Field-Testing Technician Grade I Certification Exam CP-1 (12) (Latest Update 2025 / 2026) Questions & Answers | Grade A | 100% Correct

ACI Concrete Field-Testing
Technician Grade I Certification
Exam CP-1 (12) (Latest Update 2025
/ 2026) Questions & Answers |
Grade A | 100% Correct


ASTM C138
Standard Test Method for Density (Unit Weight), Yield, and Air Content
(Gravimetric) of Concrete




Question:
The diameter of the tamping rod used in this test method is _____ .
Answer:
⅝ in. [16 mm]

,Question:
What is the required shape of the tamping end of the rod?
Answer:
Rounded to a hemispherical tip




Question:
What is the required minimum frequency of the vibrator used in this test
method?
Answer:
7000 vibrations per minute




Question:
The outside diameter or side dimension of the vibrating element must be at
least _____ but not greater than _____ .
Answer:
0.75 in. [19 mm], 1.50 in. [38 mm]




Question:
A plastic container can be used for the measure in this method. True or False?
Answer:
False, measure must be steel or other suitable metal

,Question:
What is the minimum thickness of a metal strike-off plate?
Answer:
¼ in. [6 mm]




Question:
What is the minimum thickness for a glass or acrylic strike-off plate?
Answer:
½ in. [12 mm]




Question:
What is the specified weight of the mallet used on measures that are 0.5 ft3
[14 L] or smaller?
Answer:
1.25 ± 0.50 lb. [600 ± 200 g]




Question:
Measures other than air meter bowls used for this test must conform to ASTM
_____.
Answer:
C29

, Question:
Air meter bowls used for this test must conform to ASTM _____ and be
calibrated for volume according
to ASTM _____.
Answer:
C231, C29




Question:
The concrete sample must be obtained in accordance with what ASTM
method?
Answer:
C172




Question:
What method of consolidation must be used when the slump is greater than 3
in. [75 mm]?
Answer:
Rodding