What is portland cement?
Portland cement is the most common cement used in concrete. The patent dates back to 1824 in England and is so named because the color of the cement resembled a stone found on the Isle of Portland. Portland cement is made by combining a mixture of ingredients, usually limestone, clay and shale, at very high temperatures. When mixed with water, portland cement forms a paste, which cures into a hardened mass. This chemical reaction is known as hydration. Portland cement is a hydraulic cement. Any cement, which sets and hardens when mixed with water and is capable of doing so under water, is hydraulic cement. Portland cement is usually gray in color but can be made in white or buff by adjusting the basic ingredients. The two most commonly used types of portland cement are: • Type I – For general concrete work. • Type II – For moderate sulfate resistance. The most commonly used form of Portland cement is designated Type I/II because it meets the requirements of both I and II.
Portland cement is a typical ingredient of concrete, and the most widely used type of cement. It was invented in the early nineteenth century and named after the fine building stones it resembled that were quarried in Portland, England. The innovation of Portland cement marked a milestone in the construction history, as it created a far stronger bond than the plain crushed limestone of the day. Today it remains the best-performing and most economical binder used in concrete.
Portland cement is composed of calcium silicates and aluminate and aluminoferrite It is obtained by blending predetermined proportions limestone clay and other minerals in small quantities which is pulverized and heated at high temperature around 1500 deg centigrade to produce clinker. The clinker is then ground with small quantities of gypsum to produce a fine powder called Ordinary Portland Cement (OPC). When mixed with water, sand and stone, it combines slowly with the water to form a hard mass called concrete.
Portland cement is hydraulic cement produced by pulverizing clinker consisting essentially of hydraulic calcium silicates, usually containing one or more of the forms of calcium sulfate as an interground addition. Portland cement was first patented in 1824 and is named after the natural limestone quarried on the Isle of Portland in the English Channel.
Considered to be the most common type of cement in use today, Portland cement is utilized for all sorts of building projects. The cement is used as an ingredient in materials used for sidewalks, buildings and as a binder between other substances, such as stone or brick. The basic formula for Portland cement appears to have originated in the late 18th century and was first identified by that name in the early 19th century. The name for the dry cement product is derived from the similarity of the finished product to Portland stone. This type of building product was quarried in England in the early 19th century. Using methods that were somewhat like the procedure for making Roman cement, Joseph Aspdin was awarded a patent in 1822 for creating the cement. The original formula called for the use of cement clinker, and a small amount of other ingredients. The stability of the product made the cement ideal for use in the creation of mortar and other binding materials. Aspdin’s son William lat
