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PCI Level III Quality Control Technician - Ch. 5 Questions with all Correct & 100% Verified Answers |Latest Update

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PCI Level III Quality Control Technician - Ch. 5 Questions with all Correct & 100% Verified Answers |Latest Update

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PCI Level III Quality Control Technician - Ch. 5 Questions
with all Correct & 100% Verified Answers |Latest Update
1. What is the cement content in pounds
Total batch weight is 21,533 lb.
per cu- bic yard for the following
Volume of batch is 21,533 ÷
concrete batch:
145.0 =
148.5 cu ft = 5.500 cu yd
Material - Batch Wt., lbs
Cement content = 3685 ÷ 5.500 =
Cement 3685 670 pcy
Water 1260
Sand (with 5.2% free moisture) 7166
Course Agg. (with 0.7% free moisture)
9422

Slump = 3 1/2-
in. Air Content =
3.5%
Unit Wt. of fresh concrete = 145.0
pcf Sand Sp. Gr. = 2.70
Sand FM - 2.70
Course Agg. Sp. Gr. = 2.62
Course Agg. Dry-Rodded Unit Wt.. = Water in sand = 7166 - (7166 ÷
100.0 pcf 1.052)
= 354 lb
2. What is the water-cement ratio for the Water in C.A. = 9422 - (9422 ÷
above batch? 1.007) =
65 lb
Batch water = 1260 lb
Total mixing water =
1679 W/C = 1679 ÷
3685 = 0.46

3. Define the "optimum sand ratio". For a given set of materials and for
a given water-cement ration, the opti-
mum sand ratio is the percentage
1/
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