1) SLUMP

Recommended slumps for various types of construction
Types of construction Maximum Slump (mm) Minimum Slump (mm)
Reinforced foundation walls and footings 75 25
Plain footings, caissons, and substructure walls 75 25
Beams and reinforced walls 100 25
Building columns 100 25
Pavements and slabs 75 25
Mass concrete 75 25

Enter (from Table above) slump values:

maximum = mm

minimum = mm

 

 

2) MAXIMUM AGGREGATE SIZE

Enter the nominal maximum size of coarse aggregate = mm

 


3) MIXING WATER & AIR CONTENT

NON-AIR-ENTRAINED CONCRETE
Approximate mixing water (kg/m3) for indicated nominal maximum sizes of aggregate
Slump (mm) 9.5 mm 12.5 mm 19 mm 25 mm 37.5 mm 50 mm 75 mm 150 mm
25 to 50 207 199 190 179 166 154 130 113
75 to 100 228 216 205 193 181 169 145 124
150 to 175 243 228 216 202 190 178 160 -
More than 175 - - - - - - - -
Approximate amount of entrapped air in non-air-entrained concrete (%)
Slump (mm) 9.5 mm 12.5 mm 19 mm 25 mm 37.5 mm 50 mm 75 mm 150 mm
All 3.0 2.5 2.0 1.5 1.0 0.5 0.3 0.2

Enter (from Table above) water weight for non-air-entrained concrete = kg/m3

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
(MPa)
Water-cement ratio by weight
(Non-air-entrained concrete)
40 0.42
35 0.47
30 0.54
25 0.61
20 0.69
15 0.79

Enter compressive strength at 28 days = MPa

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 25 mm cover over steel 0.45 0.40
All other structures 0.50 0.45

Weight of cement = kg/m3

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 = kg/m3

Weight of cement = kg/m3


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 (mm) 2.40 2.60 2.80 3.00
9.5 0.50 0.48 0.46 0.44
12.5 0.59 0.57 0.55 0.53
19 0.66 0.64 0.62 0.60
25 0.71 0.69 0.67 0.65
37.5 0.75 0.73 0.71 0.69
50 0.78 0.76 0.74 0.72
75 0.82 0.80 0.78 0.76
150 0.87 0.85 0.83 0.81

Nominal maximum size of aggregate = mm

Enter unit weight of coarse aggregate (if unknown, use 1500 to 1900 kg/m3 for normal weight aggregate) = kg/m3

Enter fineness modulus of fine aggregate =

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

Weight of coarse aggregate = kg/m3

 


6) FINE AGGREGATE

First estimate of concrete weight (kg/m3)
Nominal maximum size of aggregate (mm) Non-air-entrained concrete
9.5 2280
12.5 2310
19 2345
25 2380
37.5 2410
50 2445
75 2490
150 2530

Nominal maximum size of aggregate = mm

Enter (from Table above) first estimate of concrete weight = kg/m3

Weight of fine aggregate = kg/m3

 


7) ADJUSTMENT FOR MOISTURE IN AGGREGATE

Design mix water = kg/m3

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 = kg/m3

Wet weight of coarse aggregate = kg/m3

Wet weight of fine aggregate = kg/m3

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 = kg/m3

Weight of water reducer = kg/m3


8) SUMMARY OF MIX DESIGN

Enter batch percentage = %

Compressive strength at 28 days = MPa

Slump:

maximum = mm

minimum = mm

Nominal maximum size of aggregate = mm

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

Concrete type is

Air content = %

Unit weight of coarse aggregate = kg/m3

 

Ingredients of Concrete Mixture

Water kg/m3 Cement kg/m3 Coarse Aggregate kg/m3 Fine Aggregate kg/m3 Pozzolanic Materials kg/m3 Water Reducer kg/m3

 

Ingredients of % Concrete Batch

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

 


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Contact A. Ghaly at ghalya@union.edu

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