1) SLUMP

Recommended slumps for various types of construction
Types of construction Maximum Slump (in.) Minimum Slump (in.)
Reinforced foundation walls and footings 3 1
Plain footings, caissons, and substructure walls 3 1
Beams and reinforced walls 4 1
Building columns 4 1
Pavements and slabs 3 1
Mass concrete 2 1

Enter (from Table above) slump values:

maximum = in.

minimum = in.

 

 

2) MAXIMUM AGGREGATE SIZE

Enter the nominal maximum size of coarse aggregate = in.

 

3) MIXING WATER & AIR CONTENT

AIR-ENTRAINED CONCRETE
Approximate mixing water (lb/yd3) for indicated nominal maximum sizes of aggregate
Slump (in.) 3/8 in. 1/2 in. 3/4 in. 1 in. 1 1/2 in. 2 in. 3 in. 6 in.
1 to 2 305 295 280 270 250 240 205 180
3 to 4 340 325 305 295 275 265 225 200
6 to 7 365 345 325 310 290 280 260 -
More than 7 - - - - - - - -
Recommended averages of total air content (%) for level of exposure
Level of Exposure 3/8 in. 1/2 in. 3/4 in. 1 in. 1 1/2 in. 2 in. 3 in. 6 in.
Mild Exposure 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0
Moderate Exposure 6.0 5.5 5.0 4.5 4.5 4.0 3.5 3.0
Severe Exposure 7.5 7.0 6.0 6.0 5.5 5.0 4.5 4.0

Enter (from Table above) water weight for air-entrained concrete = lb/yd3

Enter (from Table above) amount of entrapped air = %

 

4) WATER-CEMENT RATIO

Relationship between water-cement or water-cementitious materials ratio and compressive strength of concrete
Compressive strength at 28 days
(psi)		 Water-cement ratio by weight
(Air-entrained concrete)
6000 -
5000 0.40
4000 0.48
3000 0.59
2000 0.74

Enter compressive strength at 28 days = psi

Enter (from Table above) water-cement (or water-cementitious materials) ratio =

Important! Check the maximum permissible water-cement ratio from the Table below and revise the water-cement ratio entered in the box above accordingly.

Maximum permissible water-cement or water-cementitious materials ratios for concrete in severe exposure
Type of Structure Structure wet continuously and exposed to frequent freezing and thawing Structure exposed to sea water or sulfates
Thin section (railings, curbs, sills, ledges, ornamental work) and sections with less than 1 in. cover over steel 0.45 0.40
All other structures 0.50 0.45

Weight of cement = lb/yd3

Are pozzolanic materials [such as Fly Ash, Silica Fumes, Ground Granulated Blast-Furnace Slag (GGBFS)] used in the mix?

* NO, click here to proceed with regular mix design.

* YES, select desired calculation method, and make input in one of the Tables below:

Weight Equivalency Method
If pozzolanic materials percentage by weight of cementitious material is known, click here , and Enter this percentage %
If pozzolanic materials percentage by volume of cementitious material is known, click here , and Enter this percentage %
 
Volume Equivalency Method
If pozzolanic materials percentage by weight of cementitious material is known, click here , and Enter this percentage %
If pozzolanic materials percentage by volume of cementitious material is known, click here , and Enter this percentage %

Enter specific gravity of pozzolanic material (if unknown, use 2.4) =

Adjusted water-cementitious materials ratio (only for volume equivalency method) =

Weight of pozzolanic materials = lb/yd3

Weight of cement = lb/yd3

5) COARSE AGGREGATE

Volume of oven-dry-rodded coarse aggregate per unit volume of concrete for different fineness moduli of fine aggregate
Nominal maximum size of aggregate (in.) 2.40 2.60 2.80 3.00
3/8 0.50 0.48 0.46 0.44
1/2 0.59 0.57 0.55 0.53
3/4 0.66 0.64 0.62 0.60
1 0.71 0.69 0.67 0.65
1 1/2 0.75 0.73 0.71 0.69
2 0.78 0.76 0.74 0.72
3 0.82 0.80 0.78 0.76
6 0.87 0.85 0.83 0.81

Nominal maximum size of aggregate = in.

Enter unit weight of coarse aggregate (if unknown, use 95 to 120 lb/ft3 for normal weight aggregate) = lb/ft3

Enter fineness modulus of fine aggregate =

Enter (from Table above) volume of coarse aggregate per unit volume of concrete =

Weight of coarse aggregate = lb/yd3

 

6) FINE AGGREGATE

First estimate of concrete weight (lb/yd3)
Nominal maximum size of aggregate (in.) Air-entrained concrete
3/8 3710
1/2 3760
3/4 3840
1 3850
1 1/2 3910
2 3950
3 4040
6 4110

Nominal maximum size of aggregate = in.

Enter (from Table above) first estimate of concrete weight = lb/yd3

Weight of fine aggregate = lb/yd3

 

7) ADJUSTMENT FOR MOISTURE IN AGGREGATE

Design mix water = lb/yd3

Enter total moisture content in coarse aggregate = %

Enter total moisture content in fine aggregate = %

Enter the degree of moisture absorption of coarse aggregate = %

Enter the degree of moisture absorption of fine aggregate = %

Net mix water = lb/yd3

Wet weight of coarse aggregate = lb/yd3

Wet weight of fine aggregate = lb/yd3

Is water reducer (chemical admixture) used in the mix?

* NO, click here to proceed with regular mix design.

* YES, select appropriate input from Table below:

If dosage of water reducer is applied as percentage of cement weight, click here Enter this percentage %
If dosage of water reducer is applied as percentage of cementitious materials (cement plus pozzolanic materials) weight, click here Enter this percentage %

Enter percent of reduction in water (as given by the manufacturer) due to applied dosage of water reducer = %

Adjusted mix water = lb/yd3

Weight of water reducer = lb/yd3

8) SUMMARY OF MIX DESIGN

Enter batch percentage = %

Compressive strength at 28 days = psi

Slump:

maximum = in.

minimum = in.

Nominal maximum size of aggregate = in.

Water-cement (or water-cementitious materials) ratio =

Concrete type is

Air content = %

Unit weight of coarse aggregate = lb/ft3

 

Ingredients of Concrete Mixture

Water lb/yd3 Cement lb/yd3 Coarse Aggregate lb/yd3 Fine Aggregate lb/yd3 Pozzolanic Materials lb/yd3 Water Reducer lb/yd3

 

Ingredients of % Concrete Batch

Water lb Cement lb Coarse Aggregate lb Fine Aggregate lb Pozzolanic Materials lb Water Reducer lb

 

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