CMP 124 Exam 2 Questions With
Revised Answers
CMU - answerConcrete Masonry Unit
CMU's are made of - answer- Portland Cement
- Water
- Aggregate (Fine)
- Admixtures (Sometimes)
Types and Reasons for Admixtures in CMU - answer- Air Entrainment: For protection
- Certain admixtures are used for...
CMU (block) Cores - answer✔✔- 2 core: Cores always line up
*lighter and costs less
- 3 core: Cores don't line up
Laying out a wall - answer✔✔- Find the true corners of the wall (check for squareness
-shoot corners for height
-build leads (corners)
-run in center
-damp proof
Footings size - answer✔✔usually 8'' thick and 16'' wide
Shape of footings - answer✔✔*add pictures*
Comparison of Foundation walls - answer✔✔-Block: More labor
-Poured Concrete: More material
^those 2 same cost
-Wood: High initial cost but way less cost in labor (fast erection time)
Moisture proofing - answer✔✔-Damp proof: Spray, Brush, roll on (Oil Based)
-Moisture proof: Tar, rubber, mastic (more $)
Brick composition - answer✔✔ALL Clay
-shale: high pressure clay
-Fire clay: mined at deeper levels
*can withstand more heat
Brick properties (desired qualities) - answer✔✔-High compressive strength
*psi range 1,500-20,00
-low absorption rate
*affects ond quality//chemical and physical bond
*bricks too hot = flash set
How are Brick Colors determined - answer✔✔-mineral plus degree of burning
Brick properties (Durability) - answer✔✔-exterior bricks need durability to withstand
weathering (=freezeing and thawing of moisture)
-Interior bricks backup bricks inside wall
Brick properties (Classification of bricks) - answer✔✔-solid: less than 25% core
-Hollow: Greater than 25% core
-advantage of hollow brick vs solid
*lighter (shipping weight)
*uniform drying
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