Two concrete suppliers produce Grade 40 concrete with varying quality of concrete. If the coefficient of variation of the concrete produced is 10% and 15%, determine target strengths for these suppliers. Assuming a 5% defect level is allowed. What does the result imply? [Ans: 47.8 MPa, 53.1 MPa]

Two concrete suppliers produce Grade 40 concrete with varying quality of concrete. If the coefficient of variation of the concrete produced is 10% and 15%, determine target strengths for these suppliers. Assuming a 5% defect level is allowed. What does the result imply? [Ans: 47.8 MPa, 53.1 MPa]

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter20: Design Of Rigid Pavements

Section: Chapter Questions

Problem 1P: Portland cement concrete consists of what four primary elements?

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Question

Two concrete suppliers produce Grade 40 concrete with varying quality of concrete.
If the coefficient of variation of the concrete produced is 10% and 15%, determine
target strengths for these suppliers. Assuming a 5% defect level is allowed. What does
the result imply? [Ans: 47.8 MPa, 53.1 MPa]

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