GATE CE 2019 Set 2 — Question 31
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Structural Engineering → Construction Materials → Concrete Mix Design
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Question
The characteristic compressive strength of concrete required in a project is and the standard deviation in the observed compressive strength expected at site is . The average compressive strength of cubes tested at different water-cement () ratios using the same material as is used for the project is given in the table.
The water-cement ratio (in percent, round off to the lower integer) to be used in the mix is _______
| (%) | 45 | 50 | 55 | 60 |
|---|---|---|---|---|
| Average compressive strength of cubes () | 35 | 25 | 20 | 15 |
Correct answer
46 to 46
Solution
1.Calculate the target mean strength ():
Given and .
.
2.Determine the ratio corresponding to using linear interpolation from the table:
Strength at is .Strength at is .Interpolating for :
.
3.Round off to the lower integer as specified:
Lower integer of is .Continue learning with Success Tracker
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