Maha cement-PPC Grade
Maha – Portland Pozzolana Cement (PPC) is
premium blended cement manufactured by inter-grinding the high quality clinker
with superfine processed fly ash. The clinker used here is specially made with
high percentage of Tricalcium Silicate C3S (58-60%). Only high quality fly ash
from select chambers of Electrostatic Precipitators (ESPs) are extracted and
transported in closed bulkers is used to manufacture Maha Cement. Clinker and
fly ash with desired proportion of gypsum is inter-ground in high efficiency closed
circuit Ball Mills. The “O-Sepa”and SKS separators used in the mills enable us
to maintain high fineness (about 350 m2/kg) and good particle size distribution
(PSD). Maha Cement thus manufactured surpasses the compressive strength
requirement of OPC 53 grade at 3, 7 and 28 days while enabling you to get
excellent durability in concrete.
|
Physical Requirements |
Requirement as per
lS1489 |
|
|
|
Fineness |
Specific
Surface (m2/kg) |
300
(min) |
330-600 |
|
Setting
Time |
a.
Initial minutes) |
30
(min) |
160-200 |
|
b.
Final (minutes) |
600
(max) |
270-300 |
|
|
Soundness |
Expansion
of unaerated cement |
||
|
a.
By LeChatelier Method (mm) |
10
(max) |
0.5-1.5 |
|
|
b. By Auto
Clave (%) |
0.8
(max) |
0.06-0.1 |
|
|
Compressive
Strength |
a.
72 ± 1 hr i.e. 3 days (M Pa) |
16
(min) |
23-26 |
|
b.
168 ± 2 hr i.e. 7 days (M Pa) |
22
(min) |
32-36 |
|
|
c.
672 ± 4 hr i.e. 28 days (M Pa) |
33
(min) |
53-56 |
|
