Product Range
The Company is always meeting the market requirement with its product range covering various grades of Ordinary Portland Cement (Now Grade 53) and Pozollona Portland Cement. In addition special cement (IRS Grade 53 S) is manufactured for supply to Railway Sleeper manufacturers.
We are also re-introducing Grade 43 which was stopped for want of demand to meet specific requirement of products if necessary.
The properties of NCL Cement far exceed the requirements of BIS Specifications. A comparison of properties is given below.
Grade
53’ Grade Ordinary Portland Cement (OPC_53)
A high – strength OPC, used for high-rise buildings, bridges, flyovers, chimneys and prestressed concrete structures where high grade concrete (>- M30) is normally required.
Advent of this grade of cement in the country owes to the improved technology at modern cement plants, which enabled production of high quality clinker. This grade was introduced in the country in 1987 by BIS and commercial production started from 1991. ‘53’ grade cement is a high-strength OPC, which provides numerous advantages wherever concrete for special high strength applications is required. Nagarjuna cement -53 Grade OPC is available on regular basis in the market.
COMPARISION OF PROPERITES OF NCL OPC WITH RELEVANT SPECIFICATIONS
S.No |
Particulars |
O P C 53 GRADE |
O P C 43 GRADE |
IS : 12269 / 1987 |
NCL Cement Range |
IS : 8112 / 1989 |
NCL Cement Range |
|
Chemical Requirements |
1 |
Lime Saturation Factor |
0.80 to 1.02 |
0.80 – 0.85 |
0.66 to 1.02 |
0.80 – 0.84 |
2 |
Insoluble Residue (% by mass) |
Max. 5.00 |
2.0 - 4.0 |
Max. 5.00 |
2.30 - 4.00 |
3 |
Magnesia (% by mass) |
Max. 6.00 |
0.60 – 0.80 |
Max. 6.00 |
0.60 – 0.80 |
4 |
Total Loss on Ignition (%) |
Max. 4.00 |
2.0 – 3.00 |
Max. 5.00 |
2.00 – 3.50 |
5 |
% AL2 O3 / Fe2 O3 |
Min. 0.66 |
1.10 – 2.40 |
Max. 0.66 |
1.20 – 2.20 |
6 |
Sulphuric Anhydride (% by mass) |
Max. 3.00 |
1.70 – 2.50 |
Max. 3.00 |
1.50 – 2.30 |
7 |
Added Performance improvers (%) |
Max.5 |
Max.5.0 |
Max.5 |
Max. 5.0 |
Physical Requirements |
1 |
Fineness (M2 / Kg) |
Min. 225 |
300- 340 |
Min. 225 |
290 - 320 |
2 |
Setting Time (in Minutes)
|
|
a. Initial |
Min. 30 |
120 – 180 |
Min. 30 |
110 – 160 |
|
b. Final |
Max. 600 |
190 - 230 |
Max. 600 |
170 – 220 |
3 |
Soundness |
| |
a. Le-Chatelier Expansion (mm) |
Max. 10.0 |
0.50 – 1.00 |
Max. 10.0 |
0.50 – 1.00 |
| |
b. Autoclave (%) |
Max. 0.8 |
0.01- 0.15 |
Max. 0.80 |
0.01- 0.15 |
3 |
Compressive Strength (Mpa) |
| |
a. 72 + 1 Hour |
Min. 27 |
29 – 32 |
Min. 23 |
27 - 30 |
| |
b. 168 + 2 Hours |
Min. 37 |
39 – 44 |
Min. 33 |
37 - 40 |
| |
c. 672 + 4 Hours |
Min. 53 |
56 – 60 |
Min. 43 |
54 – 57 |
Top
Blended Cements
Portland Pozzolana Cement (PPC)
Useful for general construction works and especially suitable for works in aggressive environmental conditions, employed for water retaining structures, marine works, mass concreting, such as dams, dykes, retaining walls, foundations, and sewage pipes.
Portland Pozzolana cement utilizes two types of pozzolanas
Portland Pozzolana cement is manufactured either by inter-grinding Portland cement, Clinker, gypsum and fly ash obtained from thermal power plants PPC with fly ash, as Pozzolana, is more popular in the country owing to the easy availability of quality fly ash from modern coal based thermal power plants. Our Kondapalli unit is slocated within proximate distance from VTPS.The fly ash to be used for manufacturing of PPC should conform to IS: 3812 (Part I) -2003. PPC accounts for nearly 47 per cent of the cement produced in the country.
PPC provides improved workability, has less segregation and bleeding increased It produces less heat of hydration and offers greater resistance to the attack of aggressive water-tightness and reduced tendency of lime to leach out.
Waters containing sulphates and chlorides. It improves the durability of structure, and also the strength of concrete over a period of time. It protects concrete against alkali-aggregate reaction. Although the minimum compressive strength of PPC after 28 days, as prescribed by BIS, is 33 N/mm the Nagarjuna brands of PPC exhibit much higher strength.
PPC is becoming popular in construction industry and its market share is progressively increasing. The fly ash in PPC helps to improve the impermeability of concrete by converting Ca(OH)2 into calcium silicate hydrate (C-S-H) gels and make concrete denser. As we use good quality fly ash conforming to IS: 3812-2003.
PPC: PPC+WATER=Gel (CSH)+Ca(OH)² Ca OH2 + Pozzolana=Gel (CSH)
S.No |
Particulars |
IS : 1489 / (Part 1) 1991 |
NCL Cement Range |
Chemical Requirements |
1 |
Total Loss on Ignition (%) |
Max. 5% |
3.0 – 4.0 |
2 |
Insoluble Residue (% by mass) (X = Declared % of fly ash) Max. |
x + 4 (100 – x) |
|
3 |
Magnesia (% by mass |
Max. 6.00 |
0.60 – 0.80 |
4 |
Sulphuric Anhydride (% by mass) |
Max. 3.00 |
1.70 – 2.20 |
Physical Requirements |
1 |
Fineness (M2 / Kg) |
Min. 300 |
310- 350 |
2 |
Setting Time (in Minutes) |
|
|
|
a. Initial |
Min. 30 |
120 - 180 |
|
b. Final |
Max. 600Max. 600 |
190 - 250 |
3 |
Soundness: |
|
a. Le-Chatelier Expansion mm) |
Max. 10.0 |
0.50 – 1.00 |
|
b. Autoclave (%) |
Max. 0.8 |
0.01- 0.15 |
4 |
Compressive Strength (Mpa): |
| |
a. 72 + 1 Hour |
Min. 16 |
25 – 28 |
| |
b. 168 + 2 Hours |
Min. 22 |
34 – 37 |
| |
c. 672 + 4 Hours |
Min. 33 |
50 – 55 |
Top
SLEEPER GRADE IRS 53
- NCL is the only unit in Andhra Pradesh to supply IRS 53 Grade Cement for Railway Sleeper Manufacture.
- IRS 53 Grade is a special Grade of Ordinary Portland Cement with properties superior to OPC 53 Grade.
- Railway Board, RVNL and Sleeper Manufacturers procure this cement from us at premium price
S.No |
Particulars |
IS : 12269 / 1987 |
Typical NCL Properties |
Chemical Requirements |
1 |
Lime Saturation Factor |
0.8 to 1.02 |
.96 |
2 |
Insoluble Residue (% by mass) |
3.0 Max |
.50 |
3 |
Magnesia (% by mass) |
5.0 Max |
1.91 |
4 |
Total Loss on Ignition (%) |
4.0 Max |
1.84 |
5 |
% AL2 O3 / Fe2 O3 |
0.66 Min |
1.22 |
6 |
Sulphuric Anhydride (% by mass) |
3.0 Max |
2.10 |
Physical Requirements |
1 |
Fineness (M2 / Kg) |
370 Min |
384 |
2 |
Setting Time (in Minutes) |
|
a. Initial |
60 Min |
110 |
|
b. Final |
600 Max |
200 |
3 |
Soundness: |
| |
a. Le-Chatelier Expansion (mm) |
5.0 Max |
1.0 |
| |
b. Autoclave (%) |
.8 Max |
.07 |
| |
c. 672 + 4 Hours |
Min. 33 |
50 – 55 |
4 |
Compressive Strength (Mpa): |
| |
a. 72 + 1 Hour |
27.0 Min |
36 |
| |
b. 168 + 2 Hours |
37.5 Min |
46 |
| |
c. 672 + 4 Hours |
53.0 Min |
70 |
