DP 83 – Cement Replacement
DP 83 is a high efficiency pozzolanic material, obtained by selection and processing of power station fly ashes resulting from the combustion of pulverised bituminous/sub-bituminous coal. AD 83 is subjected to strict quality control.
| Presentation | Finely divided dry powder |
| Colour | Greyish white |
| Bulk Weight | Aprox. 0.9 metric ton per cubic meter |
| Specific density | Aprox. 2.3 metric ton per cubic meter |
| Particle size | 95% < 45 micron |
| Particle shape | Spherical |
| Package | 30 kg bags, 1 metric ton big-bags and bulk tankers |
Recommended uses
- Concrete: General purpose plain and reinforced structural concrete with 28 day strength levels exceeding 60 MPa. Special purpose concrete, such as pre-stressed pre-cast concrete and high performance concrete.
- Cement: High grade, sulphate resistant/marine resistant blended cements (Portland Pozzolana Cement).
- Mortar: High performance mortars for use on external plastering on sea areas. Mortars to be used in the repair of structural concrete.
- Grout: Specialised micro-grouts for crack sealing in repair works.
Recommended dosages
The dosages of DP 83 and the other mix constituents should be determined by appropriate mix design testing. They will depend on required mix properties, cement grade and properties, admixtures used, etc. The following figures are indicative.
| Percentage of total binder | Dosage | |
| High strength concrete >50MPa | 25% | 100 – 120 kg/m3 |
| Medium grade concrete (30-50 Mpa) | 33% | 100 – 130 kg/m3 |
| Pre-stressed pre-cast concrete | 20% | 80 – 100 kgs/m3 |
| High Performance concrete | 25% | 80 – 100kgs/m3 |
| High grade Portland Pozzolana Cement | 25% | – |
| High performance mortars | 25% | – |
| Mortars for concrete repair | 25% | – |
| Micro-grouts for crack sealing | 33% | – |
Typical concrete performance – Replacement 1:1
(compared to plain OPC mixes)
| Better | Similar | Worse | |
| Water Demand | Reduced by 8% – 10% | ||
| Workability | Improved | ||
| Setting Time | Increased 15 – 45 min | ||
| Long Term Strength | Increased 25% – 30% | ||
| 28 day Strength | Increased 15% – 20% | ||
| Early Strength (7 days) | Similar | ||
| Required Curing | Similar | ||
| Permeability | Reduced 2 – 5 times | ||
| Sulphate Attack | Reduced | ||
| Chlorine Penetration | Reduced |