CTQP Concrete Field Inspector 3

Question 1

What is the purpose of striking off (screeding) concrete immediately after placement?

Accepted Answer

To level the concrete to the desired grade or form elevation

Answer

Screeding removes excess concrete and brings the surface to the required grade or elevation defined by the forms or screeds.

Question 2

According to ACI 305, what maximum concrete temperature at point of delivery is typically recommended for hot weather concreting?

Accepted Answer

90°F (32°C)

Answer

ACI 305 recommends that fresh concrete temperature at delivery should not exceed 90°F (32°C) to minimize adverse hot weather effects.

Question 3

A concrete cylinder that is tested at 27 days instead of 28 days will typically show:

Accepted Answer

Slightly lower strength, acceptable if within specifications

Answer

Concrete gains strength slightly day by day, so a 27-day result is marginally lower than 28-day, but many specs allow a ±1 day tolerance.

Question 4

What does a 'cold joint' in concrete indicate?

Accepted Answer

A plane of weakness formed when fresh concrete is placed against hardened concrete

Answer

A cold joint forms when fresh concrete is placed against a layer that has already set, resulting in a weak bond plane.

Question 5

Which of the following actions is NOT appropriate when concrete fails the slump test on arrival?

Accepted Answer

Allow the contractor to add water up to the maximum w/c ratio

Answer

Water should never be added to a delivered load in the field to adjust slump without written authorization and without exceeding the design w/c ratio.

CTQP - Construction Training & Qualification Program Practice Test

CTQP - Construction Training & Qualification Program Practice Test

CTQP Concrete Field Inspector 3