Portland cement, the basic ingredient of concrete, is a closely controlled chemical combination of calcium, silicon, aluminum, iron and small amounts of other ingredients to which gypsum is added in the final grinding process to regulate the setting time of the concrete. Lime and silica make up about 85% of the mass. Common among the materials used in its manufacture are limestone, shells, and chalk or marl combined with shale, clay, slate or blast furnace slag, silica sand, and iron ore.
Each step in manufacture of Portland cement is checked by frequent chemical and physical tests in plant laboratories as per Cement Standards. The finished product is also analyzed and tested to ensure that it complies with all specifications.
R.K. Enterprises Ltd. is a leading supplier of OPC offering sustainable and performance advantages for those who build, occupy and use structures of all kinds.