Transcription of Concrete Mix Design Calculations
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Concrete Mix Design Calculations
1/22/20141 Concrete Mix Design CalculationsCalculationsConcrete Mix Design Wet Cast (Slump) Dry Cast (no Slump) Dry Cast (no Slump)Combination of Art and , Cement, & Aggregate As the water to cement ratio increases, the strength of a Concrete mix mix decreases. As the surface area of the aggregate increases the more water will be needed to maintain a given slump. Coarser Surface Texture Particle Shape Particle Size Distribution As the air content increases, the strength of the Concrete It s a calculation: w/c ~ lbs. of water / lbs. of cement w/cm~ lbs. of water / lbs. of cementitious Water / Cementitious RatioOften when w/c is discussed its really w/cmthat is intended as the reference=Water cement cement ratioWater needs to be drinkable or meet ASTM expressed as decimal45 lbs of water100 lbs of cement1/22/201435 Specific Gravity The relative density of a material compared to water The ratio of a material s weight to the weight of an equalTerminology The ratio of a material s weight to the weight of an equal volume of water Bulk specific gravity (SSD): Used to determine the solid volume (absolute volume) of a material going into Concrete It is determined by submerging the material in water for ygg24 hours
667 Weight (mass) 4.81 Air 5.5% 1.485 Total 3799 27.00 w / cm 0.45 Unit Wt. 140.72 Density (unit weight) Materials Pounds of material S.G. Abs Volume Design (unit weight) 3799 Cement 667 3.15 3.39-Total Cementious 667 Miller Stone 1590 2.6 9.80 Evert Sand 1242 2.65 7.51 Water 300 1 481 27.0 4.81 Air 5.5% 1.485 Total 3799 27.00 w / cm 0.45 Unit ...
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