Modern Masonry Flashcards
Sled runner jointer used for?
- Long Horizontal Joints.
Type of brick used in areas exposed to freezing but not wet conditions.
- MW (Moderate Weather).
Unit of measure in a modular gird system is ____?
- 4”
A standard modular brick is _____________?
- 4” x 2-2/3” x 8”.
A stacked bond is _____________?
- Verticle Joints Align.
Considered the weakest bond?
- Stacked.
White powerd that appears after exposure to mositure in a masonry wall is _____________?
- Efflorescence.
Recommended mortar joints in areas that are exposed to heavy rains and high winds: ______?
- Concave.
CMU with the least pounds per cubic foot of concrete: _________?
- Expanded Shale.
Highest compressive strenght aggregate in an 8x8x16 CMU?
- Sand and Gravel.
When figuring nominal dimensions, what is the intended size of the mortar joint for concrete masonry units?
- 3/8”
An advantage of a two core block design versus a three core block design is?
- Lighter, reduced heat conductor, and more space for conduit.
To prevent mositure from entering the top of the masonry wall, sure stone___________?
- Copings.
Best type stone to protect against moisture on sills:
- Limestone.
Types of lime used in mortar?
- Type “S”.
Type of mortar best suited for use below grade?
- Type “M”
To avoid hardening due to hydration, mortar, should be used within what time span after mixing?
- 2 1/2 hours.
Add to mortar for strenght?
- Cement.
Most typically the significant property of hardened mortar?
- Bond Strenght.
Type “K” mortar is used when?
- Interior non-load bearing partitions where hgih-strenght is not necessary.
Type of mortar to be used for cavity walls when the wind speeds reach 80 mph.
- Type “S”
CF of mortar REQUIRED for a single wythe brick wall that is 200 suare feet, has 3/8” joints and 655 non-modular brick units per 100 square feet.
- 11.6 CF
Masonry walls that interset may be connected by?
- Strap Anchors.
Method of cutting brick most frequently used when the cut edge will be hidden by the mortar?
- Brick Hammer (not trowel).
When laying a brick wall, the leads are?
- Corners
Recommended sandblast pressure to use with a 1/4” nozzle when sandblasting brick?
- 60-120 psi
Best cleaning agent for brick?
- Hydrochloric or muriatic Acid for new masonry construciton.
Type of concrete block most common for the use with reinforcement?
- Two core blocks.
