WorksheetsBCM: Aggregates
Total questions: 12
Worksheet time: 7mins
Define aggregate.
slag waste from iron and steel mills that can be processed to become coarse aggregates
mass of crushed stone, gravel, and sand predominantly composed of individual particles
mass of clay or silts that mix before send to crusher
breakdown of rock masses of igneous, sedimentary and metamorphic
What are the natural sources of aggregates?
Gravel pits
Limestone
River run deposit
Rock quarries
Marble
Below are the correct particle shapes for coarse aggregates, except.
Angular
Rounded
Oval
Elongated
Flaky
Below are the correct statements about aggregate shapes and texture, except;
The rough texture is hard to bond and increases interparticle friction
angular aggregates are more difficult to work into place because difficult for them to slide across each other
angular & rough-textured
aggregates have higher stability than rounded
aggregates
rounded and
smooth aggregate particles improve the workability of fresh concrete during mixing
Aggregate is the predominant ingredient for asphalt & Portland cement.
Choose the correct percentage of aggregates used in ASPHALT CONCRETE.
Volume = 60%-75%
Weight = 79%-85%
Volume = 75%-85%
Weight = 92%-96%
Volume = 20%-25%
Weight = 29%-25%
Volume = 80%-85%
Weight = 89%-95%
Aggregate is the predominant ingredient for asphalt & Portland cement.
Choose the correct percentage of aggregates used in PORTLAND CEMENT.
Volume = 80%-85%
Weight = 89%-95%
Volume = 75%-85%
Weight = 92%-96%
Volume = 20%-25%
Weight = 29%-25%
Volume = 60%-75%
Weight = 79%-85%
Below are correct descriptions of aggregate uses as the underlying material; except.
protect the structure from frosting damage
trap water in the layer
usually used as a base course for foundation and pavement
add stability to a structure
Below are correct statements about aggregate uses in
the ingredient of Portland cement concrete and Asphalt concrete,
except.
have greater volume stability than cement paste
as a filler to reduce the amount of cement paste needed in the mix
improves the quality of the concrete mix
decreasing the economy of the mix
Identify the evaluation process in the gradation of the aggregate’s particle size.
ABRASION
TEST
SOUNDNESS
TEST
SIEVE
ANALYSIS
Below are the correct evaluation processes in the gradation of
the aggregate’s particle size, except.
(Choose TWO answers)
The sieve retains particles smaller than the opening, while larger particles
pass-through
The sieve retains particles larger than the opening, while smaller ones pass through
Metric sieve descriptions are based on the size of the openings measured in centimeters
Metric sieve descriptions are based on the size of the openings measured in millimeters
Describe coarse aggregates based on ASTM definition.
particles retained on the 2.75mm (No. 4) sieve
particles retained on the 5.74mm (No. 4) sieve
particles retained on the 4.75mm (No. 4) sieve
Describe the fine aggregates based on the ASTM definition.
those passing the 5.74-mm sieve
those passing the 2.75-mm sieve
those passing the 4.75-mm sieve
