Different Types Of Cement
- Ordinary Portland Cement (OPC)
- Portland Pozzolana Cement (PPC)
- Rapid Hardening Cement.
- Extra Rapid Hardening Cement.
- Low Heat Cement.
- Sulfates Resisting Cement.
- Quick Setting Cement.
- Blast Furnace Slag Cement.
What is the most common type of cement?
By its turn, Portland cement, which is by far the most common type of cement in use, is manufactured basically from limestone and clay (or marl) with lower amounts of gypsum.
What is the 43 grade cement?
43 grade cement means that the compressive strength of the cement after 28 days is 43 N/mm3 when tested. This grade of cement is used for plain concrete work and plastering works. It is suitable to make concrete mix up to M30.43 grade cement is also used to make precast items, such as tiles, blocks, pipes, etc. It can be used where setting time is not a necessary concern.
What is OPC cement?
- • Higher durability of concrete structure due to less permeability of water.
- • More resistance towards the attack of alkalies, sulphates, chlorides, chemicals.
- • Better work ability.
- • Low heat of hydration.
- • Due to high fineness, PPC has better cohesion with aggregates and makes more dense concreteness.
- • Comparative lower Water-Cement ratio provides an added advantage for the further increase of compressive strength of the concrete.
- • Better surface finish.
Ordinary Portland Cement is prepared by a fully-automated, dry manufacturing process using state of the art technology under strict quality assurance at all stages of manufacturing with the help of the “ROBOTIC (POLAB)” system. The product comes in a range of specifications to suit various conditions and applications such as dry-lean mixes, general-purpose ready-mixes and even high strength pre-cast and pre-stressed concrete.
Is PPC 53 grade cement?
These are 33 grade, 43 grade, 53 grade, 43 S grade and 53 S grade. There are no grades in PPC or in any other type of cement.43 S grade and 53 S grade of cement are used in Railway Engineering for manufacture of sleepers.
What is N and R in cement?
|Type of Cement||MAIN CONSTITUENTS AS PER KS EAS 18-1 : 2017|
|CEM I||Portland Cement consist > 92 % of Portland Cement Clinker as main constituents.|
|CEM II||Portland Pozzolana Cement consists of Portland Cement Clinker with 35 % Fly Ash or Slag or Natural Pozzolana or Lime Stone as main constituents.|
|CEM III||Blast Furnace Cement consist of Portland Cement Clinker With 65 % or 80 % or 95 % Granulated Blast furnace slag as main constituents.|
|CEM IV||Pozzolanic Cement is consist of Min.45 % Portland Cement Clinker with Natural Pozzolana or Lime Stone as main constituents.|
|CEM V||Composite Cement is an composition of Portland Cement Clinker with Blast Furnace Slag, Natural Pozzolana & Fly Ash.|
32.5 N – This is the most commonly used cement with ordinary early strength. It is more suitable where high early strength is not required for construction. The ‘N’ in the cement class denotes normal strength.32.5 R – This type of cement is used where high early strength is required for construction.
- The ‘R’ denotes rapid strength when curing.32.5 R cement is used where high early strength is required for construction.42.5 N – This is a stronger class of cement, able to withstand higher pressures and loads.
- This class of cement should be used when a higher initial strength is needed during the curing phase; mainly to support the weight of a heavy structure.
This type of cement is used for heavy structure like dams, high rise buildings, bridges. Curing is very much essential for any class of Cement and Construction. For CEM-I, heat liberation rate is very high after adding of water to the cement. All other classes of cement, due to the mixing of Pozzolanic materials, heat liberation rates are low after adding of water when compared to Portland Cement.
Different projects, require different cement types. Always consult with construction professionals before making a purchase of cement to ensure you acquire the right Nyumba Cement for your project. Get it right! #BuildForGenerations ● ● ● ● Mombasa Cement Limited is the region’s leading cement producer.
We produce cement for construction projects, ranging from small affordable housing developments to large-scale infrastructure projects such as high-rise buildings and civil construction projects. ● ● ● ● Mombasa Cement Limited, under the Nyumba Brand, has grown to the most favorable cement producer in the region.
Our head offices are located in Mombasa, Kenya but with plants in Vipingo, Kilifi County & Athi River, Machakos County and a vast distributor network, we strive to reach every each and every customer. We believe our customers come first and strive to provide them with construction solutions that meet the highest of standards.
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What is Type C cement?
Class C –
- This product is intended for use when conditions require high early strength.
- Available in ordinary, O, MSR, and HSR grades (similar to ASTM Spec. C150, Type III).
What are the 6 main composition of cement?
Visit ShapedbyConcrete.com to learn more about how cement and concrete shape the world around us. Portland cement is the basic ingredient of concrete. Concrete is formed when portland cement creates a paste with water that binds with sand and rock to harden.
- Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients.
- Common materials used to manufacture cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore.
These ingredients, when heated at high temperatures form a rock-like substance that is ground into the fine powder that we commonly think of as cement. Bricklayer Joseph Aspdin of Leeds, England first made portland cement early in the 19th century by burning powdered limestone and clay in his kitchen stove.
With this crude method, he laid the foundation for an industry that annually processes literally mountains of limestone, clay, cement rock, and other materials into a powder so fine it will pass through a sieve capable of holding water. Cement plant laboratories check each step in the manufacture of portland cement by frequent chemical and physical tests.
The labs also analyze and test the finished product to ensure that it complies with all industry specifications. The most common way to manufacture portland cement is through a dry method. The first step is to quarry the principal raw materials, mainly limestone, clay, and other materials.
- After quarrying the rock is crushed.
- This involves several stages.
- The first crushing reduces the rock to a maximum size of about 6 inches.
- The rock then goes to secondary crushers or hammer mills for reduction to about 3 inches or smaller.
- The crushed rock is combined with other ingredients such as iron ore or fly ash and ground, mixed, and fed to a cement kiln.
The cement kiln heats all the ingredients to about 2,700 degrees Fahrenheit in huge cylindrical steel rotary kilns lined with special firebrick. Kilns are frequently as much as 12 feet in diameter—large enough to accommodate an automobile and longer in many instances than the height of a 40-story building.
- The large kilns are mounted with the axis inclined slightly from the horizontal.
- The finely ground raw material or the slurry is fed into the higher end.
- At the lower end is a roaring blast of flame, produced by precisely controlled burning of powdered coal, oil, alternative fuels, or gas under forced draft.
As the material moves through the kiln, certain elements are driven off in the form of gases. The remaining elements unite to form a new substance called clinker. Clinker comes out of the kiln as grey balls, about the size of marbles. Clinker is discharged red-hot from the lower end of the kiln and generally is brought down to handling temperature in various types of coolers.
- The heated air from the coolers is returned to the kilns, a process that saves fuel and increases burning efficiency.
- After the clinker is cooled, cement plants grind it and mix it with small amounts of gypsum and limestone.
- Cement is so fine that 1 pound of cement contains 150 billion grains.
- The cement is now ready for transport to ready-mix concrete companies to be used in a variety of construction projects.
Although the dry process is the most modern and popular way to manufacture cement, some kilns in the United States use a wet process. The two processes are essentially alike except in the wet process, the raw materials are ground with water before being fed into the kiln.