Ultratech Cement was incorporated in 2000 as Larsen & Toubro. Later it was demerged and acquired by Grasim and was renamed as Ultra Tech Cement in 2004. Today Ultatech cement  a part of Aditya Birla group, is the country?óÔé¼Ôäós largest exporter of cement clinker. UltraTech Cement Limited has an annual capacity of 52 million tonnes. It manufactures and markets Ordinary Portland Cement, Portland Blast Furnace Slag Cement and Portland Pozzalana Cement. It also manufactures ready mix concrete (RMC). All the plants have received ISO 9001 certification.

The company has 11 integrated plants, one white cement plant, one clinkerisation plant in UAE, 15 grinding units 11 in India, 2 in UAE, one in Bahrain and Bangladesh each and five terminals, four in India and one in Sri Lanka.

The export markets span countries around the Indian Ocean, Africa, Europe and the Middle East.

Narmada Cement Company Limited was amalgamated with UltraTech in May 2006, while Samruddhi Cement Limited was amalgamated with UltraTech Cement Limited in July 2010.

UltraTech Cement Middle East Investments Limited, a wholly owned subsidiary of the Company acquired management control of ETA Star Cement together with its operations in the UAE, Bahrain and Bangladesh in September, 2010

UltraTech's other subsidiaries are Dakshin Cements, Harish Cements, UltraTech Ceylinco (P) and UltraTech Cement Middle East Investments.

Products

It manufactures ordinary portland cement commonly used in dry-lean mixes, general-purpose ready-mixes, and even high strength pre-cast and pre-stressed concrete.

It produces Portland blast furnace that has features like lighter colour, better concrete workability, easier finishability, higher compressive and flexural strength, improved resistance to aggressive chemicals and more consistent plastic and hardened consistency.It also manufactures portland pozzolana cement.

Ultratech cement exports over 2.5 million tonnes per annum which accounts for 30% of country?óÔé¼Ôäós total exports. It exports to countries like Africa, Europe and the Middle East.

Milestone

Ultratech Cement received Greentech Environment Excellence Award by the Greentech Foundation, New Delhiin the year 2000-2001

The Aditya Birla Group is the 11th largest cement producer in the world and the seventh largest in Asia.

In 2004-05 it received State and Zonal level I prize for overall performance in Mines safety.

UltraTech Cement

From Wikipedia, the free encyclopedia

UltraTech

Type	Public BSE: 532538
Industry	Building materials
Founded	1983
Headquarters	Mumbai, Maharashtra, India
Key people	O P Puranmalka, Director
Products	Cements
Revenue	US$3.7 billion (2011–12)[1]
Profit	US$450 million (2011–12)[1]
Parent	Grasim Industries
Website	www.ultratechcement.com

UltraTech Cement Limited (BSE: 532538) is India's biggest cement company^[2] and India’s largest exporter of cement clinkerbased in Mumbai, India.^[3] The company is division of Grasim Industries. It has an annual capacity of 52 million tonnes.

UltraTech cement holds the Superbrand status.^[4]

Contents

  [hide] 

• 1 Products
• 2 Plants
• 3 Brands
• 4 References

Products[edit source | editbeta]

It manufactures and markets ordinary Portland cement, Portland blast furnace slag cement, white cement and Portland Pozzolana cement. It also manufactures ready-mix concrete (RMC) and Autoclaved Aerated Concrete Blocks(AAC Blocks) with brand nameUltratech Xtralite. The export markets span countries around the Indian Ocean, Africa, Europe and the Middle East.

UltraTech is India's largest exporter of cement clinker. The company's production facilities are spread across eleven integrated plants, one white cement plant, one clinkerisation plant in UAE, fifteen grinding units, and five terminals — four in India and one in Sri Lanka. Most of the plants have ISO 9001, ISO 14001 and OHSAS 18001 certification. In addition, two plants have received ISO 27001 certification and four have received SA 8000 certification. The process is currently underway for the remaining plants. The company exports over 2.5 million tonnes per annum, which is about 30 per cent of the country's total exports. The export market consists of countries around the Indian Ocean, Africa, Europe and the Middle East. Export is a thrust area in the company's strategy for growth.

UltraTech's products include Ordinary Portland cement, Portland Pozzolana cement and Portland blast furnace slag cement.

Ordinary Portland cement Portland blast furnace slag cement Portland Pozzolana cement Cement to European and Sri Lankan norms

Ordinary Portland cement Ordinary Portland cement is the most commonly used cement for a wide range of applications. These applications cover dry-lean mixes, general-purpose ready-mixes, and even high strength pre-cast and pre-stressed concrete.

Portland blast furnace slag cement Portland blast-furnace slag cement contains up to 70 per cent of finely ground, granulated blast-furnace slag, a nonmetallic product consisting essentially of silicates and alumino-silicates of calcium. Slag brings with it the advantage of the energy invested in the slag making. Grinding slag for cement replacement takes only 25 per cent of the energy needed to manufacture Portland cement. Using slag cement to replace a portion of Portland cement in a concrete mixture is a useful method to make concrete better and more consistent. Portland blast-furnace slag cement has a lighter colour, better concrete workability, easier finishability, higher compressive and flexural strength, lower permeability, improved resistance to aggressive chemicals and more consistent plastic and hardened consistency.

Portland Pozzolana cement Portland pozzolana cement is ordinary Portland cement blended with pozzolanic materials (power-station fly ash, burnt clays, ash from burnt plant material or silicious earths), either together or separately. Portland clinker is ground with gypsum and pozzolanic materials which, though they do not have cementing properties in themselves, combine chemically with Portland cement in the presence of water to form extra strong cementing material which resists wet cracking, thermal cracking and has a high degree of cohesion and workability in concrete and mortar.

Plants   [edit source | editbeta]

UltraTech Cement Limited has 12 integrated plants, 1 white cement plant, 11 grinding units in India and 1 clinkerization plant in UAE, 15 grinding units( 11 in India, 2 in UAE, 1 each in Bahrain and Bangladesh)and 6 bulk terminals (5 in India and 1 in Sri Lanka).

As part of the seventh biggest cement manufacturer in the world, UltraTech Cement has eleven integrated plants, one white cement plant, one clinkerisation plant in UAE, 15 grinding units – 11 in India, 2 in UAE, one in Bahrain and Bangladesh each and five terminals — four in India and one in Sri Lanka.. These facilities gradually came up over the years, as indicated below:

2011

UltraTech Cement Middle East Investments Limited, a wholly owned subsidiary of the Company has acquired management control of ETA Star Cement together with its operations in the UAE, Bahrain and Bangladesh

The cement business of Grasim demerged and vested in Samruddhi Cement Limited in May, 2010. Subsequently, Samruddhi Cement Limited amalgamated with UltraTech Cement Limited in July 2010.

2006

Narmada Cement Company Limited amalgamated with UltraTech pursuant to a Scheme of Amalgamation being approved by the Board for Industrial & Financial Reconstruction (BIFR) in terms of the provision of Sick Industrial Companies Act (Special Provisions)

2004 :: Completion of the implementation process to demerge the cement business of L&T and completion of open offer by Grasim, with the latter acquiring controlling stake in the newly formed company UltraTech

2003

The board of Larsen & Toubro Ltd (L&T) decides to demerge its cement business into a separate cement company (CemCo). Grasim decides to acquire an 8.5 per cent equity stake from L&T and then make an open offer for 30 per cent of the equity of CemCo, to acquire management control of the company.

2002 :: The Grasim Board approves an open offer for purchase of up to 20 per cent of the equity shares of Larsen & Toubro Ltd (L&T), in accordance with the provisions and guidelines issued by the Securities & Exchange Board of India (SEBI) Regulations, 1997.

Grasim increases its stake in L&T to 14.15 per cent

Arakkonam grinding unit

2001 :: Grasim acquires 10 per cent stake in L&T. Subsequently increases stake to 15.3 per cent by October 2002

Durgapur grinding unit

1998-2000

Bulk cement terminals at Mangalore, Navi Mumbai and Colombo

1999 :: Narmada Cement Company Limited acquired

Ratnagiri Cement Works

1998 :: Gujarat Cement Works Plant II

Andhra Pradesh Cement Works

1996 :: Gujarat Cement Works Plant I

1994 :: Hirmi Cement Works

1993 :: Jharsuguda grinding unit

1987 :: Awarpur Cement Works Plant II

1983 :: Awarpur Cement Works Plant I

Brands[edit source | editbeta]

UltraTech Cement

Birla White

UltraTech Ready Mix Concrete

UltraTech Xtralite

References[edit source | editbeta]

1. ^ ^a b "BSE Plus". Bseindia.com. Retrieved 2011-02-02.
2. ^ "Ultratech Cement | TopNews". Topnews.in. Retrieved 2010-07-16.
3. ^ "UltraTech | Contact us". Ultratechcement.com. Retrieved 2010-07-16.
4. ^ "superbrandsindia". superbrandsindia.com. Retrieved 2011-07-30.

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Categories: 

• Cement companies of India
• Companies based in Mumbai
• Companies established in 1983
• Aditya Birla Group
• S&P CNX Nifty

SO3 1.3-3.0 % Na2 + K2O 0.4-1.3 % Cl 0.01-0.1% IR 0.6-1.75 %

There are four major compounds in cement and these are known as C2S, C3S, C3A & C4AF, and their composition varies from cement to cement and plant to plant. In addition to the above, there are other minor compounds such as MgO, TiO2, Mn2O3, K20 and N2O. They are in small quantity. Of these K2O and Na2O are found to react with some aggregates and the reaction is known as Alkali Silica Reaction (ASR) and causes disintegration in concrete at a later date. The silicates C3S and C2S are the most important compounds and are mainly responsible for the strength of the cement paste. They constitute the bulk of the composition. C3A and C4AF do not contribute much to the strength., but in the manufacturing process they facilitate combination of lime and silica, and act as a flux. In a typical Portland cement, the composition of mineralogical compounds could be

Table 1 : The extent of chemical compounds in cement

S no Compound Composition as % 1 C3S 48-52 % 2 C2S 22-26 % 3 C3A 6-10 % 4 C4AF 13-16 % 5 Freelime 1-2 %

Role of compounds on properties of cement

Characteristic C3S C2S C3A C4AF Setting Quick Slow Rapid - Hydration Rapid Slow Rapid - Heat Liberation (Cal/gm) 7 days Higher Lower Higher Higher Early Strength High up to 14 days Low up to 14 days Not much beyond 1 day Insignificant Later Strength Moderate at later stage High at later stage after 14 days - -

Heat of Hydration

Most of the reactions occurring during the hydration of cement are exothermic in nature (heat is generated). This heat is called heat of hydration. It is desirable to know the heat producing capacity of cement in order to choose the most suitable cement for a given purpose. For Ordinary Portland Cement, half of the total heat is liberated between 1-3 days, about ¾th in 7 days and nearly 90% in 28 days. The rate at which the heat is produced is important for practical purposes. It may lead to cracks if not properly dissipated. The sum total heat produced, if spread over a longer period can be dissipated  to a greater degree with fewer problems. The hydration of C3S produces higher heat as compared to the hydration of C2S. Fineness of cement also affects the rate of heat development. The heat of hydration generated is generally as follows at 28 days.

Comparative table of heat of hydration produced at the end of 90 days

S no Compound Heat of hydration (calories per gram) 1 C3S 100-110 2 C2S 50-60 3 C3A 300-315 4 C4AF 95-105

It may be seen that the heat produced by C3S is twice that of C2S and that by C3A is still higher. It follows that, reducing the proportions of C3S and C3A, the heat of hydration and its rate can be reduced.

What is hydration of cement?

When water is added to cement, the paste is formed due to chemical reaction, which hardens into rock like mass over a period of time. Compounds like C3S and C2S react in the presence of moisture and fully hydrated reaction can be expressed as 2C3S +6H -> C3S2H3 +3Ca(OH)2 2C2S +4H -> C3S2H3 +Ca(OH)2 C3S2H3 (Calcium Silicate Hydrate) becomes a hard mass over a period of time and normally called as C-S-H gel. While C3S contributes to most of the strength development during the first two weeks, C2S influences gain of strength after two weeks. However, in the long term (over a year) the contribution to strength is same for equal individual weight.

Site best viewed in 1024x768 screen resolution using Internet Explorer 5.0 or above. Home Cement Concrete Site Map Disclaimer Home » Cement » Composition Composition of Portland cement The basic components of cement are: SiO2 17-25 % Al2O3 4-8% Fe2O3 0.5-0.6 % CaO 61-63 % MgO 0.1-4.0 % SO3 1.3-3.0 % Na2 + K2O 0.4-1.3 % Cl 0.01-0.1% IR 0.6-1.75 %

Authorised Dealer Ultratech  Cement

UltraTech Cement Limited is India’s leading and the world’s 8th largest cement manufacturer. The company`s state-of-the-art production facilities are spread across 11 integrated plants, 1 white cement plant, 1 clinker plant in UAE, 15 grinding units (11 in India, 2 in UAE, 1 in Bahrain and Bangladesh each) and 6 bulk terminals (5 in India and 1 in Sri Lanka). Most of the plants are ISO 9001, ISO 14001 and OHSAS 18001 certified. In addition, 2 plants have received ISO 27001 certification, while four have received SA 8000 certification.

With exports of over 2.5 million tonnes per annum to countries across the Indian Ocean, Africa, Europe and the Middle East, UltraTech Cement is India’s largest exporter of cement clinker.

UltraTech stands for:

• Premium-quality cement and allied products
• Superior strength for durable structures that can weather any condition
• The largest technical cell providing value-added services like training programmes to the construction fraternity for capacity building, on-site demos, testing of raw materials and consultative services on best construction practices
• A clear customer focus with dedicated teams attending to enterprise customers
• Bringing in innovation in every application
• Well-spread network with multiple logistic feed
• Use of technology for improved speed and connectivity thereby ensuring availability of products

Products:

• Ordinary Portland Cement
• Portland Blast Furnace Slag Cement
• Portland Pozzolana Cement

Ordinary Portland Cement (OPC)
Ordinary portland cement is most commonly used for a wide range of applications. These applications cover dry-lean mixes, general-purpose ready-mixes, high strength pre-cast and pre-stressed concrete.

Portland Blast Furnace Slag Cement (PSC)
Portland blast-furnace slag cement comprises 50 per cent finely ground and granulated blast-furnace slag, consisting essentially of silicates and alumino silicates of calcium. Using slag cement in a concrete mixture is a useful method to make concrete better and more consistent. Portland blast-furnace slag cement has a lighter colour, better concrete workability, easier finishability, higher compressive and flexural strength, lower permeability, improved resistance to aggressive chemicals and better plastic and hardened consistency.

Portland Pozzolana cement (PPC)
Portland pozzolana cement consists of 25 to 35 percent of pozzolanic material like fly ash which is a byproduct of coal burning in thermal power stations. Pozzolanic materials, though not having cementing properties by themselves react with lime produced during hydration of cement to form compounds that give strength and enhance durability. Use of PPC helps in minimizing shrinkage and thermal cracking, increases workability and cohesion in concrete and mortar.