Ch. 37 - Masonry Flashcards
(26 cards)
What do construction joints in masonry do?
Isolate the masonry from the through wall elements such as doors and windows.
Control joints in masonry accommodate _______ and ______.
Thermal expansion and contraction.
The slope of coping on top of a brick wall is called…
wash
What is efflorescence?
A white, crystalline deposit from water-soluble salts on the surface of brick. It is caused when water seeps into the masonry and then evaporates leaving behind salts.
What is the equivalent block thickness of an 8” thick concrete block that is 60% solids?
Actual thickness is 7 5/8” (7.625)
(7.625)(.60) = 4.58
Major Expansion joints are placed every ________ to ________ feet in large buildings?
100’ to 150’
Expansion and control joints are placed where in brick masonry walls?
Every 20’ and wherever a wall changes direction height of thickness
Horizontal expansion joints should be placed where?
below shelf angles that support the intermediate sections of brick below beams and slabs of brick
With Single wythe walls what is the maximum ratio of unsupported height or length to thickness cannot exceed?
20: 1 in solid masonry walls
18: 1 in hollow masonry
What is the spacing of horizontal reinforcement in both CMU and brick masonry walls?
16” on center
what are the 8 types of tooling in masonry construction?
concave, vee, flush, trowel struck, extruded, beaded, raked, weather struck
What is the slope of the coping called?
The wash
What is the typical spacing for weep holes?
24” on center
What type of cement would be best when tuck pointing a masonry wall?
High lime cement
What is mortar made of?
Portland Cement, hydrated lime, and an inert aggregate (sand)
What type of mortar would be best in an exterior load bearing application?
Type M and S
After what amount of time should masonry that was mixed be discarded?
2.5 Hours after it was mixed, because at this point the masonry has begun the chemical process
What are the three grades of building brick?
SW (Oregon and Eastern coast of US)
MW (Midwest most of Washington)
NW (Southern US, New Mexico Oklahoma Texas)
What are the three grades of facing brick
FBX- Best
FBS- Middle
FBA- Lowest
What are the average thickness for mortar joints?
1/4”-1/2”
How long after masonry is placed should the wall be struck?
1-2 hours
What are the 4 types of masonry joints that are good in exterior applications?
Weathered Joint
Concave Joint
Vee Joint
Flush Joint
What is the ideal temperature range for laying brick?
40 degrees - 90 degrees
T/F Brick should be wetted before setting to minimize water absorption.
True
