Lecture #4 - Concrete Mix Design Flashcards
1
Q
What should the decision of exposure class be based on?
A
service conditions of the structure or structural element and not the conditions during construction
2
Q
What is specified strength?
A
the concrete strength that individual tests can be expected to be below only 10% of the time
3
Q
What are the soruces of concrete strength variability?
A
variations in mix ingredients, changes in concrete making and placing, variations in sampling procedures, variations in the laboratory test
4
Q
How many cylinders is each test result based on the average of?
A
2
