COSC 253 Exam 3 Simms || with 100% Error-free Solutions.
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COSC 253
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COSC 253
What are the ingredients for mortar? correct answers Fine aggregate (sand), lime, water and Portland Cement
Why is lime added to the mortar mix? correct answers Increases workability and improves the smoothness
After 2 1/2 hours the mortar mix must be discarded. (T/F) correct answers True
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COSC 253 Exam 3 Simms || with 100% Error-free Solutions.
What are the ingredients for mortar? correct answers Fine aggregate (sand), lime, water and
Portland Cement
Why is lime added to the mortar mix? correct answers Increases workability and improves the
smoothness
After 2 1/2 hours the mortar mix must be discarded. (T/F) correct answers True
Stiff mortar can be "retempered" if the mix is less than 90 minutes old. (T/F) correct answers
True
What do bond enhancers do when added to the mortar mix? correct answers Improve flexural
strength and freeze-thaw resistance
What is the order of the mortar types from strongest to weakest? correct answers M, S, N, O, K
Which ASTM standard corresponds with the mortar types? correct answers C270, Type K is
excluded
What happens to the compressive strength of mortar if you increase the cement to lime ratio?
correct answers It increases
The higher the strength of the mortar the lower the workability of that mix. (T/F) correct answers
T
If the masonry is in contact with the earth which mortar type is required? correct answers M
Exterior brick veneer subjected to severe lateral loads (high winds and seismic forces) must use
what type of mortar? correct answers S
If the wall is loadbearing; you can use mortar types N and O. (T/F) correct answers False
Which mortar type is used for historic restoration? correct answers K
What are the methods for defining mortar? correct answers The proportioning of the ingredients
or
Property specification (i.e., minimum compressive strength)
Use one method or the other, never both
What are the three major brick making methods? correct answers Soft mud process (oldest)
Dry-press process
Stiff mud process (least costly and most widely used)
, Which brick making method is the most commonly used? correct answers Stiff mud, accounts
for almost 90% of bricks made in the US
Describe the soft mud brick making process and the two ways the molds are pre-struck. correct
answers Relatively moist clay is pressed into individual molds, may be hand or machine pressed
Water-struck: molds are pre-wetted
Sand-struck: molds are pre-dusted with sand
Describe the dry-press brick making process. correct answers Clays are kept relatively dry and
stiff, and are machine-pressed into steel molds at high pressure
Describe the stiff mud brick making process. correct answers Moderately moist clay is extruded
through dyes and then sliced into individual units. Usually leaves the brick with a smooth face
and high dimensional uniformity
What are the two types of brick firing? correct answers Tunnel kiln and Periodic kiln
Describe the tunnel kiln process. correct answers Bricks pass continuously from one end of the
kiln to the other
Describe the periodic kiln process. correct answers Batches of bricks are loaded, fired, cooled
and removed
Brick placement and firing conditions affect what? correct answers Finished brick color,
uniformity of shape and hardness
Steam curing of bricks requires only ______ of the energy required for kiln firing of bricks.
correct answers 15%
How much less is the actual dimension from the nominal dimension? correct answers 3/8",
depends on joint thickness which is usually 3/8"
What are cored bricks? correct answers Solid bricks with holes cut out in the middle to reduce
weight and the costs of firing. Not less than 75% solid
What are frogged bricks? correct answers Fully solid bricks, less prone to shifting on a wet
mortar bed. Indention on the bed side of the brick to grip the mortar
What are hollow bricks and what are the benefits of using hollow bricks? correct answers Up to
60% void, lighter in weight, require less energy to fire, larger voids can readily accommodate
steel reinforcing
What are special shaped bricks used for? correct answers Form arches, water tables and other
forms and features. Whatever is designed
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