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CM Lab 4, Part 3 - CVE 474 Construction Materials Lab...

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CVE 474: Construction Materials Lab Experiment 4 (Part III): Portland Cement Concrete – Mix Design and Test for Physical Properties 5/3/11 Jonathan Brate Group #3: ‘Mix B’ Part III (a): For this part of the experiment, the final mix design was calculated based on information given and found in the tables. Given amounts included Bulk Specific Gravity, Absorption Capacity, Moisture Content, Unit Weight, and Fineness Modulus. The tables used were 6.3.3, 6.3.4a, 6.3.4b, and 6.3.6, and the values attained from these tables were 365 lbs/yd 3 , w/c=0.48, air 5%,
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and V=0.57, respectively. It is also assumed that Specific Gravity is 3.15. Below is the table with the information given. BSG (SSD) Absorption M.C Unit Weight F.M. Fine Aggregate 2.65 1.2 1.29 N/A 2.7 Coarse Aggregate 2.64 1.5 0.11 102 lbs/ft 3 N/A The following are the calculations performed to attain the final mix design of this concrete: 365/0.48 = 760.42 lbs/yd 3 Weight of CA: V CA =0.57(27) = 15.39 ft 3 15.39*102 = 1596.78 lbs 1596.78*(1+.015) = 1593.33 lbs Find V FA : Weight of FA: Water = 365/62.4 = 5.85 ft 3 6.65(2.65)(62.4) = 1097.99 lbs Cement = 760.42/(3.15*62.4) = 3.87 ft 3 CA = 1593.33/(2.64*62.4) = 9.67 ft 3 Air = 0.05(27) = 1.35 ft 3 TOTAL = 20.55 ft 3 V FA = 27 - 20.55 = 6.65 ft 3 CA: MC is less than Absorption, so it absorbs or takes water from mix.
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