Certified Company
ISO 9001:2005
Structures built with Duff. Cement display continued gain of strength even beyond 28 days. This superior characteristics is not so pronounced in OPC.
The small size and the glassy texture of fly ash in Duff. Cement makes it possible to reduce the amount of water required for a given consistency. This results in improved workability, finishing and better slump retention characteristics that improves its place-ability with reduced tendency of segregation and honeycombing.
The pozzolanic reaction involving fly ash and calcium hydroxide causes pore refinement which reduces the permeability of concrete. The embedded reinforcements therefore remain relatively better protected from ingress of water and salts thus making the structure more durable.
Use of good quality fly ash in lkilkyin Cement improves the resistance of concrete to acidic waters. sulphate and chlorides. This happens due to reduction of calcium hydroxide in concrete and reduced permeability as a result of pozzolanic reactions.
Every tonne of clinker produced releases one tonne of carbon dioxide in the atmosphere. Replacing over 30% of clinker with fly ash not only reduces CO2 emissions but also helps conserve energy and scarce natural resources.
Chemical Characteristics (Units % By Mass) |
Requirements Of IS 1489 (Part1) | DUFFERIN STRONG | |
---|---|---|---|
Magnesia (MgO) | 6.0 | Maximum | <3.00 |
Insoluble Residue | x+4x(100-x)/100 Where x is the declared % of fly ash in the PPC sample |
Maximum | <32.00 |
Sulphuric Anhydride(SO2) | 3.0 | Maximum | 2.4 0.1 |
Loss On Ignition | 5.0 | Maximum | <3.5 |
Total Chloride(Cl) | 0.1 | Maximum | <0.006 |
Physical Characteristics | Units | Requirements Of IS 1489 (Part1) | DUFFERIN STRONG |
---|---|---|---|
Sp. surface blaine | M2/kg | 300 minimum | 380 10 |
Le-Chatelier Expansion Aotuclave Expansion |
mm % |
10 maximum 0.8 maximum |
<2.0 <0.1 |
Initial setting time Final setting time |
Minutes Minutes |
Not less than 30 Not more than 600 |
180 20 250 20 |
At 3 days At 7 days At 28 days |
MPa MPa MPa |
16 minimum 22 minimum 33 minimum |
27 2 35 2 51 2 |
A Lime Saturation Factor 0.870 Cao-0.7S03 2.8 SiO3+ 1.2 A1503+ 0.65 Fe303 |
0.870 | |
B Ratio of Alumina to that of 1.56 Iron Oxide % of A1303/ Fe303 | 1.56 | |
C Magnesia % by Mass 0.89 | 0.89 | |
D Total Sculpture Contents as SO3 2.18 | 2.18
1.82 |
Not more than 2.5 and 3.0 when c3A percent by mass is 5 or less & greater than 5 respectively |
E Insoluble residue % by Mass | 1.84 | 3 % Max |
F Loss of Ignition | 0.40 | |
G Alkalizes % K2O | 0.016 | 5 % Max |
H Total Chloride Contents | 0.10 | |
I % Na2O | 10 % Max |
A Fineness | 273.3 | 225 sqr km/kg |
B Soundness 1 Lech atelier 2 2 Autoclave |
1.00 0.040 |
10mm Max 0.8%Max |
C Setting Time 1 Initial 2 Final |
130 180 |
30 minutes min. 600 minutes max. |
D Compressive Strength 1 3 Days (72 +/- 1 Hr.) 2 7 Days (168 +/- 2 Hrs.) 3 28 Days (678 +/- Hrs.) |
30.5 40.0 54.5 |
23.0 Mpa Min. 33.0 Mpa Min. 43.0 Mpa Min. |
Percentage of water required for Standard Consistency | 27.5 |