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Portland cement is the most common type of cement in general use around the world as a basic ingredient of concrete, mortar, stucco, and non-specialty grout. It was developed from other types of hydraulic lime in England in the early 19th century by Joseph Aspdin , and is usually made from limestone .
The resulting hard substance, called 'clinker', is then ground with a small amount of gypsum (CaSO 4 ·2H 2 O) into a powder to make ordinary Portland cement, the most commonly used type of cement (often referred to as OPC). Portland cement is a basic ingredient of concrete, mortar, and most non-specialty grout. The most common use for Portland ...
Attock Cement Pakistan Limited (Urdu pronunciation: [a.ˈʈʌk sɪˈmɛnt] ah-TUCK-si-MENT), trading as Falcon Cement, is a Pakistani cement manufacturer headquartered in Karachi, with manufacturing plant in Hub, Balochistan. It was incorporated in Pakistan on 14 October 1981 as a public limited company.
Unlike regular concrete, ECC has a tensile strain capacity in the range of 3–7%, [1] compared to 0.01% for ordinary portland cement (OPC) paste, mortar or concrete. ECC therefore acts more like a ductile metal material rather than a brittle glass material (as does OPC concrete), leading to a wide variety of applications.
Maple Leaf Cement was founded in 1956 by the West Pakistan Industrial Development Corporation in a collaboration with the Government of Canada. [7] [8] The initial production capacity was 120,000 tons per annum (tpa) of ordinary Portland cement, which increased by an additional 180,000 tpa in 1960.
Portland cement is usually made from cheap, quarried raw materials, and these usually contain substantial amounts of Cr, Mn and Fe. For example, limestones used in cement manufacture usually contain 0.3-1% Fe 2 O 3, whereas levels below 0.1% are sought in limestones for white manufacture. Typical clays used in gray cement rawmix may contain 5 ...
There he introduced a new and substantially stronger cement, using a modified recipe for cement-making, the first "modern" Portland cement. [4] In 1844 Joseph retired, transferring his share of the business to James. James moved to a third site at Ings Road in 1848, and this plant continued in operation until 1900.
OPC Foundation, a related consortium Operations Planning and Control, from Tivoli Software , known as IBM Tivoli Workload Scheduler Optimized Power Control , a method to adjust laser power when writing optical media.