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

Higher w/c ratio produces stronger concrete

Answer

Water-cement ratio has no effect on strength

Answer

A w/c ratio of 0.70 is ideal for maximum strength

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

1 day

Answer

3 days

Answer

28 days

Question 3

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

Accepted Answer

3/8 inch

Answer

1/4 inch

Answer

1/2 inch

Answer

3/4 inch

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

#3 bar

Answer

#4 bar

Answer

#5 bar

Question 5

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

Accepted Answer

ASTM C150

Answer

ASTM C33

Answer

ASTM C94

Answer

ASTM C90

Question 6

What is the primary purpose of air entrainment in concrete mixes used in Florida?

Accepted Answer

To improve workability and reduce bleed water

Answer

To increase compressive strength

Answer

To speed up the set time in hot weather

Answer

To increase the water-cement ratio

Question 7

When building a masonry retaining wall in Florida, the Florida Building Code requires that weep holes be provided at what minimum spacing?

Accepted Answer

48 inches on center

Answer

24 inches on center

Answer

32 inches on center

Answer

No weep holes are required if drainage fill is used