CEE 395 concrete labc

CEE 395 concrete labc - Portland Cement Concrete Lab...

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Portland Cement Concrete Lab Assignment By CEE 395: Materials for Constructed Facilities Spring 2008
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Mix Design (Use mix design data we handed out day of mixing) 1.1. Show your mix design table for one cubic yard of concrete. (Also indicate W/ C, and whether you used an admixture. This is the data given day of mixing.) (2) Mix # 1 CY mix (lb) Coarse Aggregate 1590 Fine Aggregate 1361.24 Cement 700 Water 348 Superplasticizer (oz) 1.05 1.2. Show calculations to confirm the mix design values using the data given in Figure 1. (Show all equations used and indicate tables used). (14) Coarse Aggregate (Angular Crushed Limestone) Specific Gravity 2.65 Moisture Content 0.23% SSD 1.63% Maximum Size (in) 0.75 Rodded Unit Weight (pcf) 95 Fineness Modulus 2.8 Fine Aggregate Specific Gravity 2.65 Moisture Content 0.14% SSD 0.57% Fineness Modulus 2.8 Cement Specific Gravity 3.15 Figure 1 - Properties used for given concrete mix designs Strength requirement given at 3,000 psi Water to cement Ratio used table 7.2 on page 241 to determine .45. Course Aggregate - Using table 7.5 on page 244 we determined bulk volume of coarse aggregate per unit volume to be .62 Vca/Vconc = .62
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3 x 27 ft 3 /yd 3 = 1590.3 lb/yd 3 Air Entrainment - used table 7.6 on page 245 for severe exposure to get 2.0% air required. IT is none entrained concrete. Workability - used slump test table 7.7 on page 246 to get maximum slump of 3” for pavements and slabs as well as minimum slump of 1”. Water content – used table 7.8 on page 248 to get slump of 1”-2”, ¾ “ max size, non air entrained give you 315 lb/yd 3 . Cement content- used .45 w/c 315lb.yd 3 /.45 = 700lbs Admixture used manufactures design of .15 oz per 100 lb cement. .15oz*(700lb/100lb)=1.05 Fine Aggregate Vwater=(315lb/yd 3 )/( 62.4 lb/ft 3 )=5.048 ft 3 /yd 3 Vcem=(700ln/yd 3 )/ [(62.4 lb/ft 3 )*3.15]=3.56 ft 3 /yd 3 Vdair = .54 ft Vca = 1590.3 lb/yd 3 /[(62.4 lb/ft 3 )*2.65]=9.62 lb/yd 3 Vol Fine aggregate = 27-18.768=8.232 ft 3 /yd 3 Weight fine Agg.= 8.232 ft 3 /yd 3 *62.4 lb/ft 3 *2.65= 1361.24 Moisture Content: 315 lb/yd 3 -1590.3 lb/yd 3 (1.0023-1.0163)-1361lb/yd 3 (1.0014-1.0057) = 343.112lb/ yd 3 1.3. What would happen if aggregates were at: (8) - Higher moisture content than SSD? There would be excess water which would affect the amount of super plastizer used - Lower moisture content than SSD? We would need to add more water to balance SSD. Hydration might not occur. 2. Concrete Mixing (Use your group’s data in answering the following questions) 2.1. Report the results of the slump test @ 75% and 100% of mix design water. Did the slump meet the design requirements? If not, explain why. (4) 75% H 2 O Slump: 0 in 100% H 2 O Slump : 5in The slump was more then what we had planned for so this was a failure. Yet
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This note was uploaded on 04/06/2008 for the course CEE 395 taught by Professor Bahia during the Spring '08 term at Wisconsin.

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CEE 395 concrete labc - Portland Cement Concrete Lab...

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