DP 40 – Cement Replacement
DP 40 is a high efficiency pozzolanic material, obtained by selection and processing of power station fly ashes resulting from the combustion of pulverised bituminous coal. DP 40 is subjected to strict quality control.
General Information
| Presentation | Finely divided dry powder |
| Colour | Light grey |
| Bulk Weight | Aprox. 1.0 metric ton per cubic meter |
| Specific density | Aprox. 2.3 metric ton per cubic meter |
| Particle size | Maximum 25 % ROS on 45 micron sieve |
| Particle shape | Spherical |
| Package | 1 metric ton big-bags and bulk tankers |
Recommended uses
- Concrete: General purpose plain and reinforced structural concrete | Mass concrete to reduce the heat of hydration | Pumpable concrete by providing excellent workability
- Cement: Blended cements (Portland Pozzolana Cement), such as sulphate resistant/marine resistant cement.
- Mortar: General purpose mortar for plastering and brickwork.| Specialised mortars for floor / wall tiling work.| Flowable mortars for use as structural fill in earthworks.
- Grout: General purpose grouts for use in earthworks for the treatment of rock cracks.
Recommended dosages
The dosages of DP 40 and the other mix constituents should be determined by appropriate mix design testing. They will depend on required mix properties, grade of cement, admixtures used, etc. The following figures are indicative.
Typical replacement levels with DP 40
| Mass concrete | |
| Percentage of total binder | 50% |
| Dosage | 100 – 150 kg/m3 |
Typical concrete performance with 25% DP 40
| Workability | Improved |
| Setting Time | Increased 30 – 60 min |
| Long Term Strength | Increased 15% -20% |
| Early Strength (7 days) | Reduces by 20% |
| Required Curing | 8 to 10 Days |
| Permeability | Reduced 2 – 5 times |
| Sulphate Attack | Substantially Reduced |
| Chlorine Penetration | Substantially Reduced |
| Heat of Hydration | Substantially Reduced |
| Plastic Shrinkage | Reduced |