design mix

CONCRETE MIX DESIGN USING AMERICAN CONCRETE ASSOCIATION (ACI) ABSOLUTE VOLUME METHOD

Slump Range: 80-100mm
Water-Cement Ratio: 0.68

Mix Component Properties:

Cement Type:1 Specific Gravity: 3.15

Coarse Aggregate Nominal Maximum Particle Size: 25mm(1in.)
SSD Bulk Specific Gravity: 2.53
% Absorption Capacity: 3.47%
Dry-Rodded Density: 1.543 g/cm3

Fine Aggregate SSD Bulk Specific Gravity: 2.700
% Absorption Capacity: 3.54% Fineness Modulus: 3.09

1.Determine densities of all materials to be used: ρ = G x ρw

Material Specific
Gravity
x ρ w
Density (kg/m3)
Water
1 x 1000
1000
Cement
3.15
x 1000
3150
SSD Coarse Aggregate
2.53
x 1000
2530
SSD Fine Aggregate
4.01
x 1000
4010
Dry-rodded Coarse Aggregate

1543

2.Determine volume of water required.

Using Table 4a below, the mass of water required to make 1 m3 of mix can be selected.

Mass of water required to make 1 m3 of mix = 193 kg

3. Determine volume of air

Using Table 4c below, the volume of air in 1 m3 of non-air entrained concrete mix is selected.

Percent air entrapped = 1.50%

Volume of air = 1m3 x 0.015 = 0.015 m3

4. Determine volume of cement required.

Since from the table above, water-cement ratio by weight for non-entrained mix of 0.68 is required,

Using the density of cement(3150 kg/m3) and the calculated mass of cement, volume of cement required for the mix is:

5. Determine volume of dry-rodded coarse aggregate required

Using table 3, volume of dry-rodded coarse aggregate can be determined.

With the fineness modulus of 3.09 and nominal maximum aggregate size, volume of dry-rodded coarse aggregate required is 0.65.

6. Determine SSD volume of coarse aggregate

With the dry-rodded density of coarse aggregate, 1543 kg/m3,

7. Determine volume of fine aggregate

With SSD density of fine aggregate,
0.3055m3 x 4010 kg/m3 =1225.055 kg