Masonry

Question 1

what is CMU?

Answer 1

concrete masonry units (solid or hollow)

Question 2

what are the 3 types of shape for masonry wall?

Answer 2

Stretcher (middle of the wall)
Single corner
Double corner (masonry column or double wall)

Question 3

What are the weight classes for CMUs and what make its heavy or not?

Answer 3

Lightweight
Medium weight
Normal weight
The agg. used

Question 4

What are the benefits of lightweight CMU?

Answer 4

Easy handling & transportation
Higher thermal and fire resistance

Question 5

What is the difference between nominal and actual dimensions?

Answer 5

Nominal dimensions include half a joint (3/8”)
Actual dimensions are design sizes of unit (used for calculations of compressive strength)

Question 6

what does water affects in a brick?

Answer 6

affects durability

Question 7

What determines the the durability of a brick?

Answer 7

Absorption (high absorptive bricks can cause efflorescence)

Question 8

What are the basic ing. of mortar?

Answer 8

PC, masonry cement, hydrated lime and sand

Question 9

What is the function of mortar?

Answer 9

Bonding masonry units together
Serving as a seating material
Leveling the units
Providing aesthetic quality of the struc.