MIX PROPORTIONING. Prepared by Marcia C. Belcher Construction Engineering Technology. Design Consideration: Obtaining Good Workability. Design Consideration: Obtaining Good Workability. Obtaining Good Workability. Obtaining Good Workability.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Prepared by Marcia C. Belcher
Construction Engineering Technology
Well Graded Poorly Graded
1 CUBIC YARD
Wt. of Cement
Slump =1.0 inch
28-day strength of 5000 psi
Air content: 4.5 - 6.5 percent
Volume of Water = 4 ft3 per cubic yard of concrete
Step #5: Cement Content
Wt. of Cement
3.15 x 62.4 lbs/ft3
Volume of Cement = 3.18 ft3 per cubic yard of concrete
Weight(Dry) =.71 x 27 ft3/yd3 x 100 lb/ft3 = 1,917 lbs
Volume = 1,917 lbs = 11.46 ft3
2.68 x 62.4 lbs/ft3
Dry Rodded Unit Wt of Stone
Wt of Sand(Dry) = 6.87 ft3 x 2.64 x 62.4 lbs/ft3 = 1,131.7 lbs.
Since there is moisture in both coarse & fine aggregate,
their batch weights must be adjusted
Mixing water needs to be adjusted. Both the coarse and fine aggregate are wet of SSD and will contribute water to the cement paste.
Water from Stone = 1,917 lbs. x (.01-.005) = 9.59 lbs
Water from Sand= 1,131.7 lbs x (.05-.007) = 48.66 lbs
Water = 250 lbs – 9.59 lbs – 48.66 lbs = 191.75 lbs