Cement is an inorganic, non-metallic substance with hydraulic binding properties, and is used as a bonding agent in building materials. It is a fine powder, usually gray in color that consists of a mixture of the hydraulic cement minerals to which one or more forms of calcium sulfate have been added. Mixed with water it forms a paste, which hardens due to formation of cement mineral hydrates. Cement is the binding agent in concrete, which is a combination of cement, mineral aggregates and water. Concrete is a key building material for a variety of applications. In the manufacture of Portland cement, clinker is lumps or nodules, usually 3-25 mm in diameter, produced by sintering limestone and alumino-silicate during the cement kiln stage. Clinker is the main ingredient in cement. These hardened granules are obtained by firing a mixture of approximately 80% limestone and 20% clay to a high temperature. The most commonly used cement in the world is Portland cement, which is formed at high temperatures that chemically combine the ingredients into new components, including calcium silicates and calcium aluminates. When the cement clinkers are ground with approximately 5% gypsum, they form Portland cement. These compounds allow cement to set when combined with water and to form strong bonds that can withstand pressure, water immersion, and other elements. Cement Clinker is an intermediate product used in manufacture of Portland and Blended Cements in Cement. Portland cement clinker is ground (usually with the addition of a little gypsum, that is, calcium sulfate dehydrate) to a fine powder and used as the binder in many cement products. As a whole it is a good project for entrepreneurs to invest. Few Indian Major Players are as under • A C C Ltd. • Almora Magnesite Ltd. • Ambuja Cement Eastern Ltd. • Ambuja Cement Rajasthan Ltd. • Ambuja Cements Ltd. • Anjani Portland Cement Ltd. • Barak Valley Cements Ltd. • Bheema Cements Ltd. • Bhilai Jaypee Cement Ltd. • Birla Corporation Ltd. • Cement Manufacturing Co. Ltd. • Century Textiles & Inds. Ltd. • Chettinad Cement Corpn. Ltd. • Dalmia Cement (Bharat) Ltd. • Dhar Cement Ltd. • Gangotri Cement Ltd. • Greygold Cements Ltd. • Gujarat High Tech Inds. Ltd. • Gujarat Sidhee Cement Ltd. • Hemadri Cements Ltd. • K C P Ltd. • Keerthi Industries Ltd. • Khalari Cements Ltd. • Lafarge India Pvt. Ltd. • Malabar Cements Ltd. • Mangalam Cement Ltd. • Meghalaya Cement Ltd. • My Home Inds. Ltd. • N C L Industries Ltd. • Namo Cements Ltd. • Narmada Cement Co. Ltd. • C L India Ltd. • Orient Cement Ltd. • P R Cements Ltd. • Ramco Cements Ltd. • Ramco Industries Ltd. • Rashmi Cement Ltd. • Rishi Cement Co. Ltd. • Sanghi Industries Ltd. • Saurashtra Cement Ltd. • Shaktiman Cements Ltd. • Shiva Cement Ltd. • Shree Cement Ltd. • Shree Digvijay Cement Co. Ltd. • Shri Hariganga Cement Ltd. • Snhehadhara Industries Ltd. • Sparta Cements & Infra Ltd. • Sri Vishnu Cement Ltd. • Srichakra Cements Ltd. • Tata Chemicals Ltd. • Trinetra Cement Ltd. • Ultratech Cement Ltd. • Vinay Cements Ltd. • Virgo Cements Ltd. • Visaka Cement Industry Ltd. • Zuari Cement Ltd.
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