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

PresentationFinely divided dry powder
ColourLight grey
Bulk WeightAprox. 1.0 metric ton per cubic meter
Specific densityAprox. 2.3 metric ton per cubic meter
Particle sizeMaximum 25 % ROS on 45 micron sieve
Particle shapeSpherical
Package1 metric ton big-bags and bulk tankers

Recommended uses

  1. Concrete: General purpose plain and reinforced structural concrete | Mass concrete to reduce the heat of hydration | Pumpable concrete by providing excellent workability
  2. Cement: Blended cements (Portland Pozzolana Cement), such as sulphate resistant/marine resistant cement.
  3. Mortar: General purpose mortar for plastering and brickwork.| Specialised mortars for floor / wall tiling work.| Flowable mortars for use as structural fill in earthworks.
  4. 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 binder50%
Dosage100 – 150 kg/m3

Typical concrete performance with 25% DP 40

Setting TimeIncreased 30 – 60 min
Long Term StrengthIncreased 15% -20%
Early Strength (7 days)Reduces by 20%
Required Curing8 to 10 Days
PermeabilityReduced 2 – 5 times
Sulphate AttackSubstantially Reduced
Chlorine PenetrationSubstantially Reduced
Heat of HydrationSubstantially Reduced
Plastic ShrinkageReduced