Question

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Problem 5 (20 points) Control Chart You are the manager of an asphalt batch plant. You are evaluating quality control test data for a highway paving project. The design specifies an asphalt content of 5% with a tolerance of +1.5%,-1.0%. 3 samples were taken each day for 5 days. Your lab has plotted the test data for the last week. Asphalt Sample Content 5.0% 4.9% 4.5% 5.1% 5.3% 5.2% 5.6% 5.4% 5.9% 5.7% 5.9% 5.9% 5.9% 6.0% 5.9% 3 Draw and label the Upper Control Limit and Lower Control Limit on the chart. a. 5 6 b. Is the asphalt within specifications? Explain c. What trend(s) do you observe? 10 d. What corrective or preventive action do you recommend to ensure that the asphalt stays within specifications? 12 13 14 15 Problem 6 (40 points) Sieve Analysis Sieve size Amount retained (g) 9.5 4.75 2.36 0.600 0.075 Pan 252.1 204.7 149.7 125.8 60.4 a) Calculate the percent passing through each sieve. b) What is the maximum size? c) What is the nominal maximum size? d) How many grams of material pass through the 2.36 mm sieve? e Plot this data on a semilog gradation chart. f) Plot this data on a.45 power gradation chart. g) Is this a well-graded or a poorly-graded aggregate? Explain? h) Using ASTM C33 (Table 5.5 in text book) what is the closest size number and does it meet the gradation for that standard size?

Answer 1

ANS 6) Sieve Analysis.

sieve amount count %Retained % passing size Retained ret . % passing through each sieve shown in above table. maximum size is 25mm Nominal max size is 25mm material passing through 2.36 mm sieve is (125.80 + 60.40 + 7.30) = 193.50 gms (24.19/100 times 800) = 193.50 gms this is well graded aggregate. well graded aggregates have aggregates of all sizes, which can be seen in above readings. poorly graded aggregate have aggregate of one size only . Gap graded aggregate have some particle size missing. ASTM c33 Table not posted.