CCIL Concrete Field Testing Procedures 3

Question 1

When consolidating concrete in a cylinder mold using internal vibration, what is the maximum diameter of the vibrator permitted?

Accepted Answer

One-third the diameter of the mold

Answer

Per ASTM C31, the vibrator diameter must not exceed one-third the diameter of the mold to allow proper consolidation without segregation.

Question 2

What is the purpose of the bleeding test described in ASTM C232?

Accepted Answer

To measure water gain at the surface of freshly placed concrete

Answer

ASTM C232 measures the relative quantity of mixing water that will bleed from a sample of fresh concrete.

Question 3

Which ASTM standard covers field-cured concrete specimens for acceptance testing?

Accepted Answer

ASTM C31

Answer

ASTM C31 covers both standard-cured and field-cured specimens made and cured in the field for acceptance and quality control.

Question 4

What is the maximum time allowed between sampling fresh concrete and completing the slump test?

Accepted Answer

5 minutes

Answer

Per ASTM C143, the slump test must be completed within 5 minutes after obtaining the composite sample.

Question 5

At what depth below the concrete surface must a thermometer probe be inserted when measuring concrete temperature per ASTM C1064?

Accepted Answer

75 mm (3 in.)

Answer

ASTM C1064 requires the thermometer to be inserted at least 75 mm (3 in.) deep to obtain a representative temperature reading.

CCIL - Canadian Council of Independent Laboratories Practice Test