Portland Cement Concrete Flashcards
1
Q
Who is responsible for the mixture and properties of PCC?
A
the materials engineer
2
Q
Ingredients of Concrete
A
Aggregates, PC, Water and admixtures
3
Q
PC + Water
A
Paste
4
Q
Quality of concrete is affected by mostly
A
vibration, placement, and curing
5
Q
How to determine how much of each admixtures or need?
A
depends on size of project
6
Q
Arbitrary Volume method
A
1:2:3 = PC:sand:coarse agg
7
Q
absolute volume method
A
using specific gravity to get the unit weight to account for the amount
8
Q
How do engineers compute strength for concrete mix design?
A
Know the specified compressive strength, the standard deviation, and allowable risk
9
Q
According to ASCE, what is the z-score for the average compressive strength?
A
f’cr=f’c+1.34s where s is standard deviation
10
Q
Units for design strength
A
MPa or PSI
