Field Testing Technician Flashcards

Per ASTM C143, the height of the standard slump cone is:

Answer: 12 inches

The standard slump cone is 12 inches (305 mm) tall per ASTM C143.

When performing the slump test per ASTM C143, the concrete is placed in the mold in:

Answer: 3 layers

ASTM C143 requires filling the cone in 3 equal layers, each rodded 25 times with a tamping rod.

The entire slump test procedure from start of filling the mold to removal of the cone must be completed within:

Answer: 2 minutes and 30 seconds

ASTM C143 requires the complete procedure from start of filling to cone removal to be done within 2 minutes and 30 seconds.

The tamping rod specified in ASTM C143 for the slump test is:

Answer: 5/8 inch diameter, 24 inches long, hemispherical end

ASTM C143 specifies a 5/8-inch (16 mm) diameter, 24-inch (600 mm) long rod with a rounded hemispherical tip.

Per ASTM C143, the slump measurement is recorded to the nearest:

Answer: 1/4 inch

ASTM C143 requires reporting the slump to the nearest 1/4 inch (5 mm).

If concrete produces a shear slump (falls to one side) on the first test attempt per ASTM C143, the technician should:

Answer: Repeat the test using a new sample from the same batch

A shear slump on the first attempt requires repeating the test; if it shears again on the second try, the concrete lacks the plasticity needed for a valid slump result.

Per ASTM C1064, a temperature-measuring device must remain immersed in fresh concrete for a minimum of:

Answer: 2 minutes

ASTM C1064 requires the thermometer to remain inserted in the concrete for at least 2 minutes before reading the temperature.