how should i pick the points and draw the lines? solve A,B and C with steps plea
ID: 1885452 • Letter: H
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how should i pick the points and draw the lines? solve A,B and C with steps please. thanks!
Problem 3 Contrel Chart. (25 points) You are evaluating quality coetrol test data for a highway paving project The design specifies an entrained air antent of 60% with a tolerance of . Low-10% The mix dougn speona average Cantent 4 ounces of air entraining agent per cubic yard. 3 samples were taken each dey for 15 days. A coworker has ploted the daily average test data 5.8% 56% 5.8% 5.7% Control Chart Air Content(%) 7.5% 7.0% 6.5% 10 5.4% cu 5.5% C$.35 4.5% 40% 14 1 5.00% 15 | 5.2% o1 2 345 6 78910 11 12 13 14 15 16 Day Draw and label the Target Air Content, Upper Control Limit and Lower Control Limit on the chart· 4(1'6Z +1, b. Is the concrete within specifications? Explain c. Do you recommend any corrective or preventive to ensure thet the concrete stays specifications?Explanation / Answer
a) The air content as percentage is given on y-axis. As provided, 6% is the Target Air Content. And since the tolerance limits are +/- 1%, The Upper Control Limit will be 6+1 = 7%, and Lower Control Limit will be 5%. So for satisfactory quality, the air content MUST fall between 5% to 7%.
b) In the given 15 day test data, all of the air contents fall between 5% to 7% specification range, so the concrete is within specifications.
c) Since the data indicates that air content is always below our target of 6%, albeit within specifications, it is recommended to increase the quantity of air entraining agent from present 4 ounces per cubic yard so that average air content remains at or around 6% for highest quality.
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