DP 60 – Cement Replacement
DP 60 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 60 is subjected to strict quality control.
|Presentation||Finely divided dry powder|
|Bulk Weight||Aprox. 1.0 metric ton per cubic meter|
|Specific density||Aprox. 2.3 metric ton per cubic meter|
|Particle size||Maximum 18 % ROS on 45 micron sieve|
|Package||30 kg paper bags, 1 metric ton big-bags and bulk tankers|
- Concrete: General purpose plain and reinforced structural concrete with 28 day strength levels up to 50 MPa. Special purpose concrete, such as mass concrete, pre-cast concrete, pumpable concrete, self-compacting and self-levelling concrete.
- 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. Grouts for earthworks to be used in anchors.
The dosages of DP 60 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 60
|Percentage of total binder||Dosage|
|Low grade concrete (up to 35 Mpa)||23% – 35%||80 – 150 kg/m3|
|Medium grade concrete (35-50 Mpa)||25% – 35%||100–175 kg/m3|
|Pre-cast concrete||20% – 35%||70 –140 kg/m3|
|Mass concrete||50%||100 – 150 kg/m3|
|Pumpable concrete||30% – 35%||100–175 kg/m3|
|Self compacting/levelling concrete||40%||150 – 200 kg/m3|
Typical concrete performance with 25% DP 60
|Water Demand||Reduced by 8%|
|Setting Time||Increased 30 – 60 min|
|Long Term Strength||Increased 15% -20%|
|28 day Strength||Similar|
|Early Strength (7 days)||Reduces by 10-15%|
|Required Curing||8 to 10 Days|
|Permeability||Reduced 2 – 5 times|
|Sulphate Attack||Substantially Reduced|
|Chlorine Penetration||Substantially Reduced|
|Heat of Hydration||Substantially Reduced|