FCC Concrete & Masonry Construction 2

Question 1

What is the water-cement ratio (w/c) relationship to concrete strength?

Accepted Answer

Lower w/c ratio produces stronger concrete

Answer

A lower water-cement ratio results in denser concrete with fewer voids, producing higher compressive strength as established by Abrams' Law.

Question 2

How long must freshly placed concrete be cured under normal Florida temperature conditions to achieve adequate early strength?

Accepted Answer

7 days

Answer

A minimum of 7 days of moist curing is typically required for normal Portland cement concrete to develop sufficient early strength and durability.

Question 3

When laying CMU block walls, mortar joints are typically how thick according to standard masonry practice?

Accepted Answer

3/8 inch

Answer

Standard masonry practice specifies 3/8-inch mortar joints for CMU block walls, providing adequate bond and consistent coursing dimensions.

Question 4

In Florida, rebar placed in masonry cells must be grouted when the bar size exceeds what diameter?

Accepted Answer

All cells with rebar must be grouted

Answer

All masonry cells containing reinforcing bars must be fully grouted to ensure proper load transfer and to protect the steel from corrosion.

Question 5

Which ASTM standard governs the specification of portland cement used in Florida concrete construction?

Accepted Answer

ASTM C150

Answer

ASTM C150 is the standard specification for Portland cement, defining the requirements for the eight types of Portland cement used in construction.

(FCC) Florida Certified Contractors Practice Test