15 Questions
What does a lesser abrasion in LA Abrasion Test indicate for aggregate quality?
High quality aggregate
Why is resistance to weathering action an important factor in choosing aggregate?
To ensure durability of concrete structures
According to the rules of thumb, why do graded aggregates pack more densely than one-sized aggregates?
Due to the decrease in voids with compaction effort
How is the grading of aggregate determined in ASTM C136 Sieve Analysis?
By arranging sieves based on decreasing opening size
What effect does using smooth and rounded aggregate have on concrete workability?
Increases workability
How does a rough surface on aggregates impact the bond strength between cement paste and aggregate?
Increases bond strength
Why is it important to measure the moisture states of aggregates before mixing them with water and cement?
To ensure the right concrete properties
What does the Apparent Specific Gravity (Gsa) measure?
Ratio of weight in air of an impermeable portion of aggregate to weight in air of water
How is the Apparent Specific Gravity (Gsa) calculated?
A / (A - C)
What does Bulk Specific Gravity, SSD basis measure?
Mass of saturated surface-dry sample in air
How is the specific gravity of fine aggregates measured?
Using a pycnometer
What does the term 'Voids' refer to in the context of aggregates?
The amount of air space in the aggregate or space between the particles
How is void content expressed?
As a percent of gross volume which is solid volume plus volume of voids
Why is the unit weight of aggregate important in designing concrete mix proportions?
To predict the density of concrete made with the aggregate
What does a bulk density range of 95-105 pcf indicate for normal-weight aggregates?
High density compared to lightweight aggregates
Test your knowledge on specific gravity of aggregates, including the concept of apparent specific gravity and the calculation formula. Understand the difference between specific gravity and apparent specific gravity for coarse aggregates.
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