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CE 337 EXAM 3 QUESTIONS AND CORRECT ANSWERS

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Course CE 337
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CE 337 EXAM 3 QUESTIONS AND CORRECT ANSWERS

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CE 337 EXAM 3 QUESTIONS AND CORRECT
ANSWERS


Objectives of PCC - Answers - - Economical
- Constructible
- Strength & Durability
- Specifications compliance
- Aesthetics

Total volume of PCC Mixture - Answers - 27ft^3 or 1 yd^3

How does total volume help to determine the weight of fine agg - Answers - Covert all
ingredients to volumes.

What are the limitations - Answers - - No consideration to performance
- No consideration of volumetric properties
- No consideration given to combined agg gradation

What does workability factor indicate - Answers - If the mix is coarse or fine

What does Coarseness factor indicate - Answers - If the mix is gap or well-graded

Optimized gradation can yeild - Answers - - Minimum voids
- Less paste
- Reduces shrinkage potential
- Cost effectiveness

Why do we need admixtures - Answers - - Durability
- Strength
- Constructibility
- Setting time

What can admixtures do and not do - Answers - - CANNOT replace a good mix design
and construction practice
- ENHANCE certain PCC properties not easily obtained through normal mix design
practices

Air entrainment - Answers - - Freeze thaw
- Critically saturated when 91% of pores are filled with water
- When frozen 9% expansion
- Not enough space to accommodate for the expansion. Stress cracking occurs

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