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

ASTM C172 requires that the first and last 10% of each load be excluded from sampling because these portions may not represent the bulk of the concrete.

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

ASTM C172 requires composite samples to consist of not fewer than two portions collected from different points during the load discharge.

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

The technician's role is to test and accurately document results; acceptance or rejection decisions belong to the engineer of record, not the testing technician.

Question 4

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

Accepted Answer

ASTM C31

Answer

ASTM C31 is the standard practice for making and curing concrete test specimens in the field; C192 covers laboratory fabrication.

Question 5

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

Accepted Answer

ASTM C172

Answer

ASTM C172 is the standard practice for sampling freshly mixed concrete and is the first step before any other fresh concrete testing.

ACI (American Concrete Institute Certification) Practice Test

ACI (American Concrete Institute Certification) Practice Test

ACI Certification Field Testing Technician 5