ACI Concrete- Section 4 Exam 2026
Questions and Answers
The diameter of the tamping rod used in this test method is ________. - Answer -
16 mm (5/8") + or - 2 mm (1/16")
What is the required shape of the tamping end of the rod - Answer -Rounded to
Hemispherical tip
What is the required minimum frequency of the vibrator used in this test method? -
Answer -9000 vibrations per minute (150Hz)
The outside diameter or side dimension of the vibrating element must be at least
______ but not greater than _______. - Answer -19 mm (3/4"), 38 mm (1-1/2")
A plastic container can be used for the measure in this test method. - Answer -
False, measure must be steel or other suitable metal
What is the minimum thickness of a metal strike-off plate? - Answer -6 mm (1/4")
What is the minimum thickness for a glass or acrylic strike-off plate? - Answer -12
mm (1/2")
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
Questions and Answers
The diameter of the tamping rod used in this test method is ________. - Answer -
16 mm (5/8") + or - 2 mm (1/16")
What is the required shape of the tamping end of the rod - Answer -Rounded to
Hemispherical tip
What is the required minimum frequency of the vibrator used in this test method? -
Answer -9000 vibrations per minute (150Hz)
The outside diameter or side dimension of the vibrating element must be at least
______ but not greater than _______. - Answer -19 mm (3/4"), 38 mm (1-1/2")
A plastic container can be used for the measure in this test method. - Answer -
False, measure must be steel or other suitable metal
What is the minimum thickness of a metal strike-off plate? - Answer -6 mm (1/4")
What is the minimum thickness for a glass or acrylic strike-off plate? - Answer -12
mm (1/2")
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
