This article is an abridged version of the full article, which appeared in the April Use our papers to help you with yours 1 - Unique cement industries ltd.
Portland cement Portland cement is by far the most common type of cement in general use around the world. Portland cement is a basic ingredient of concretemortarand most non-specialty grout. The most common use for Portland cement is to make concrete. Concrete is a composite material made of aggregate gravel and sandcement, and water.
As a construction material, concrete can be cast in almost any shape, and once it hardens, can be a structural load bearing element. Portland cement may be grey or white.
Portland cement blends[ edit ] Portland cement blends are often available as inter-ground mixtures from cement producers, but similar formulations are often also mixed from the ground components at the concrete mixing plant. All compositions produce high ultimate strength, but as slag content is increased, early strength is reduced, while sulfate resistance increases and heat evolution diminishes.
Used as an economic alternative to Portland sulfate-resisting and low-heat cements. The fly ash is pozzolanicso that ultimate strength is maintained. Because fly ash addition allows a lower concrete water content, early strength can also be maintained. Where good quality cheap fly ash is available, this can be an economic alternative to ordinary Portland cement.
In countries where volcanic ashes are available e. The maximum replacement ratios are generally defined as for Portland-fly ash cement.
Portland silica fume cement. However, silica fume is more usually added to Portland cement at the concrete mixer. They are usually complex proprietary formulations containing Portland clinker and a number of other ingredients that may include limestone, hydrated lime, air entrainers, retarders, waterproofers and coloring agents.
They are formulated to yield workable mortars that allow rapid and consistent masonry work. These are designed to produce a controlled bond with masonry blocks.
Expansive cements contain, in addition to Portland clinker, expansive clinkers usually sulfoaluminate clinkersand are designed to offset the effects of drying shrinkage normally encountered in hydraulic cements.
White blended cements may be made using white clinker containing little or no iron and white supplementary materials such as high-purity metakaolin. Colored cements serve decorative purposes. Some standards allow the addition of pigments to produce colored Portland cement.
Very finely ground cements are cement mixed with sand or with slag or other pozzolan type minerals that are extremely finely ground together. These are the cements the Romans used, and are present in surviving Roman structures like the Pantheon in Rome.
They develop strength slowly, but their ultimate strength can be very high. The hydration products that produce strength are essentially the same as those in Portland cement.
Slag-lime cements— ground granulated blast-furnace slag is not hydraulic on its own, but is "activated" by addition of alkalis, most economically using lime. They are similar to pozzolan lime cements in their properties. Only granulated slag i.Cement Industry In Bangladesh Essay 81 - Free Essay about Cement Industry In Bangladesh available now.
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