QUALITY CONTROL
The factory is equipped with a ‘state of the
art’ laboratory. A team of highly qualified
professionals work 24x7 who carry out quality
tests and analysis of raw materials, work in
process and finished products, to ensure the
products are of the highest quality.
The Research and Development team has developed
cost effective inputs to meet process parameters.
Regular analysis of cement samples is conducted
in-house. By using XRF and instrumental methods. Samples are also sent to independent
quality analysts for inspections and to establish
quality standards.
|
| |
|
Product wise Quality Parameters |
|
Fineness |
| Specific Surface (M2/Kg) |
290 |
225 |
300 |
225 |
350 |
300 |
| Soundness
|
| Lechatlier Method (m.m.) |
0.5-1.0 |
Max 10 |
0.5-1.0 |
Max 10 |
1.0 |
Max 10 |
| Auto clave (%) |
0.05-0.06 |
Max 0.8 |
0.05-0.06 |
Max 0.8 |
0.02 |
Max 0.8 |
|
Setting time (Minutes) |
| Initial |
100-140 |
Min 30 |
100-140 |
Min 30 |
110 |
Min 30 |
| Final |
180-220 |
Max 600 |
180-220 |
Max 600 |
200-220 |
Max 600 |
| Compressive
strength Mpa |
| 3 days |
30 |
Min 23 |
33 |
Min 27 |
25 |
Min 16 |
| 7 days |
40 |
Min 33 |
43 |
Min 37 |
35 |
Min 22 |
| 28 days |
50 |
Min 43 |
58 |
Min 53 |
45 |
Min 33 |
|
Chemical requirements |
| Loss on
ignition (%) |
0.8-2.0 |
Max 5 |
1.5-2.0 |
Max 4.0 |
1.8-2.5 |
Max 5 |
| Insoluble
residue (%) |
3.0-4.5 |
Max 5 |
3.0-4.0 |
Max 5 |
25-27 |
18-37 |
| Magnesium
Oxide (%) |
0.8-1.2 |
Max 6 |
0.8-1.0 |
Max 6 |
1.0-1.2 |
Max 6 |
| Lime
saturation factor |
0.83-0.6 |
0.66-1.02 |
0.85-0.93 |
0.8-1.02 |
|
|
| Sulphuric
Anhydride (%) |
2.0-2.5 |
Max 3.00 |
2.0-2.5 |
Max 3.00 |
2.0-2.2 |
Max 3 |
| Chlorides
(%) |
0.05 |
Max 0.1 |
0.05 |
Max 0.1 |
0.05 |
NA |
 |
| |
|
Not more than - X+ ——————, X = Declared % of Fly ash. %
will not vary more than +3.0%
|
| 100 |
