ACI Certification Field Testing Technician 5

Question 1

Per ASTM C172, composite concrete samples shall NOT be taken from the first or last:

Accepted Answer

10% of the load

Answer

5% of the load

Answer

15% of the load

Answer

25% of the load

Question 2

A composite sample per ASTM C172 must be composed of not fewer than:

Accepted Answer

2 portions taken from different points in the load discharge

Answer

3 portions taken at equal time intervals

Answer

4 portions from each quadrant of the truck drum

Answer

5 portions at one-cubic-yard intervals

Question 3

When a field test reveals that concrete slump exceeds the specification limit, the ACI field testing technician's primary responsibility is to:

Accepted Answer

Perform and document all required tests, then notify the responsible party

Answer

Add water at the job site to improve workability and retest

Answer

Reject the load and send the truck back immediately

Answer

Wait for the concrete to stiffen back within specification and retest

Question 4

Which ASTM standard is the practice for making and curing concrete test specimens in the field?

Accepted Answer

ASTM C31

Answer

ASTM C192

Answer

ASTM C39

Answer

ASTM C172

Question 5

Which ASTM standard covers the procedure for sampling freshly mixed hydraulic cement concrete?

Accepted Answer

ASTM C172

Answer

ASTM C143

Answer

ASTM C138

Answer

ASTM C31

Question 6

Per ASTM C1064, the minimum immersion depth for a concrete temperature-measuring device is:

Accepted Answer

3 inches (75 mm)

Answer

1 inch (25 mm)

Answer

2 inches (50 mm)

Answer

4 inches (100 mm)

Question 7

The initial curing period under ASTM C31, during which standard-cured specimens are protected at the job site before transport, lasts:

Accepted Answer

24 hours after molding

Answer

4 hours after molding

Answer

48 hours after molding

Answer

72 hours after molding