| 1. |
Is
Arasu brand cement a good quality cement? |
| |
Yes.
Arasu brand cement is a very good quality cement manufactured
by Tamilnadu Cements Corporation Ltd., a Govt. of Tamilnadu
undertaking and number of Govt. Buildings, Dams and Bridges
have been constructed by using entirely Arasu cement, which
stands as Testimony for "ARASU Cement". |
| 2. |
What
is the minimum quantity to be ordered for delivery at site?
|
| |
10
Tonnes consisting of 200 bags of cement. |
| 3. |
What
is the minimum time required for delivery of cement? |
| |
Cement
will be supplied within 24 hours from the time of remittance
of cash/DD. |
| 4. |
Whether
the customer can directly make the payment for supply of cement
at the factories? |
| |
Consumers
have to make the payment through one of the authorised dealers
situated near their place of construction excepting in Chennai
and Suburbs where they can make the payment for supply of cement
directly at TANCEM's Corporate Office at 735, Anna Salai, Chennai-2
for any quantity. |
| 5. |
What
is the mode of payment? |
| |
The
cost of cement has to be remitted either by cash or by way of
Demand Draft drawn in favour of
'Tamilnadu Cements Corporation Limited' . |
| 6. |
What
is OPC Cement? |
| |
OPC
means Ordinary Portland Cement which contains mixture of portland
clinker and Gypsum ground to a very fine powder. |
| 7. |
What
is PPC Cement? |
| |
PPC
means Portland Pozzolana Cement. It is manufactured by blending
a mixture of Ordinary Portland cement and Pozzolana materials
such as Fly Ash, in proportions not less than 15% and not more
than 35% by weight of cement. The fineness of PPC will be greater
than OPC. |
| 8. |
What
is the difference between OPC and PPC Cement? |
| |
Addition
of Pozzolanic material such as fly ash in the cement manufacture
by 15% to 35% is the only difference between OPC and PPC. |
| 9. |
What
are preferable constructions by OPC and PPC? |
| |
OPC: OPC
is categorised as 33 Grade, 43 Grade and 53 Grade. It is preferably
used in Defence Services, Railway Sleeper making and in lean
concrete structures.
PPC: PPC is having better resistance to Sulphate attack and
hence it is preferably used in Sea Shore, Dam constructions
and in the earth work concreting to neutralise corrosion effect
of soil and water under the earth's crest. Due to higher fineness,
mostly it is used in plastering work for smooth finishing.
|
| 10. |
What
are the duration of curing for OPC and PPC? |
| |
Duration
for curing is same for both OPC and PPC. But the water cement
ratio may be slightly varied. As the cement is attaining full
strength at 28 days, concretes made out of both the cements
are to be cured for 28 days. |
| 11. |
What
is the method of curing for OPC and PPC? |
| |
Method
of curing is identical for both OPC and PPC. A slightly higher
humidity has to be created around the cement construction (by
poring water) so as to allow the water content of cement mortar/concrete
is ready for hydration reaction upto 28 days, the time required
to attain full strength. |
| 12. |
What
is percentage of sand mixing for OPC and PPC? |
| |
Sand
mixing in OPC or PPC is at different level depending upon the
nature of mortar/concrete works. Some of the specialised concreting
works, the addition of sand is restricted in PPC when compared
to OPC. |
| 13. |
What
are the setting time for OPC and PPC? |
| |
Same
for both OPC and PPC. i.e. initial setting time 30 minutes and
final setting time 600 Minutes. (10 hours) |
| 14. |
What
is the difference between 43 and 53 Grade? |
| |
Both
differs in terms of compressive strength as per details given
below
|
TIME
|
43
GRADE
|
53
GRADE
|
| A.
3 Days Strength |
23
Mpa (min) |
27
Mpa (min) |
| B.
7 Days Strength |
33
Mpa (min) |
37
Mpa (min) |
| C.
28 Days Strength |
43
Mpa (min) |
53
Mpa (min) |
The differences
are due to change in the potential phase composition of the
clinker. The heat of hydration of 43 Grade is less than 53 Grade. |
| 15. |
Why
there is no grade for PPC? |
| |
Since
gradation of cement is mainly due to the difference in potential
phase composition of clinker such as C2S, C3S, etc., the addition
of Pozzolana to cement manufactured will not hold good for any
cement gradation for PPC. But PPC should meet out OPC 33 Grade
strength on curing for 28 days as per BIS. |
