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.

PresentationFinely divided dry powder
ColourGreyish white
Bulk WeightAprox. 0.9 metric ton per cubic meter
Specific densityAprox. 2.3 metric ton per cubic meter
Particle size95% < 45 micron
Particle shapeSpherical
Package30 kg bags, 1 metric ton big-bags and bulk tankers

Recommended uses

  1. 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.
  2. Cement: High grade, sulphate resistant/marine resistant blended cements (Portland Pozzolana Cement).
  3. Mortar: High performance mortars for use on external plastering on sea areas. Mortars to be used in the repair of structural concrete.
  4. 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 binderDosage
High strength concrete >50MPa25%100 – 120 kg/m3
Medium grade concrete (30-50 Mpa)33%100 – 130 kg/m3
Pre-stressed pre-cast concrete20%80 – 100 kgs/m3
High Performance concrete25%80 – 100kgs/m3
High grade Portland Pozzolana Cement25%
High performance mortars25%
Mortars for concrete repair25%
Micro-grouts for crack sealing33%

Typical concrete performance – Replacement 1:1

(compared to plain OPC mixes)
Water DemandReduced by 8% – 10%
Setting TimeIncreased 15 – 45 min
Long Term StrengthIncreased 25% – 30%
28 day StrengthIncreased 15% – 20%
Early Strength (7 days)Similar
Required CuringSimilar
PermeabilityReduced 2 – 5 times
Sulphate AttackReduced
Chlorine PenetrationReduced