Product Description
Portland cement (often referred to as OPC, from Ordinary
Portland Cement) is the most common type of cement in general use
around the world because it is a basic ingredient of concrete,
mortar, stucco and most non-specialty grout. It is a fine powder
produced by grinding Portland cement clinker (more than *0%), a
limited amount of calcium sulfate (which controls the set time) and
up to 5% minor constituents as allowed by various standards such as
the European Standard EN****1:Portland cement clinker is a
hydraulic material which shall consist of at least two-thirds by
mass of calcium silicates (3 CaO·SiO2 and 2 CaO·SiO2), the
remainder consisting of aluminium- and iron-containing clinker
phases and other compounds. The ratio of CaO to SiO2 shall not be
less than 2.0. The magnesium oxide content (MgO) shall not exceed
5.0% by mass.ASTM C **0 defines portland cement as "hydraulic
cement (cement that not only hardens by reacting with water but
also forms a water-resistant product) produced by pulverizing
clinkers consisting essentially of hydraulic calcium silicates,
usually containing one or more of the forms of calcium sulfate as
an inter ground addition." Clinkers are nodules (diameters, 0.**1.0
inch [5–*5 mm]) of a sintered material that is produced when a raw
mixture of predetermined composition is heated to high temperature.
The low cost and widespread availability of the limestone, shales,
and other naturally occurring materials make portland cement one of
the lowest-cost materials widely used over the last century
throughout the world. Concrete becomes one of the most versatile
construction materials available in the world.
Portland cement clinker is made by heating, in a kiln, a
homogeneous mixture of raw materials to a sintering temperature,
which is about ***0 °C for modern cements. The aluminium oxide and
iron oxide are present as a flux and contribute little to the
strength. For special cements, such as Low Heat (LH) and Sulfate
Resistant (SR) types, it is necessary to limit the amount of
tricalcium aluminate (3 CaO·Al2O3) formed. The major raw material
for the clinker-making is usually limestone (CaCO3) mixed with a
second material containing clay as source of alumino-silicate.
Normally, an impure limestone which contains clay or SiO2 is used.
The CaCO3 content of these limestones can be as low as *0%. Second
raw materials (materials in the rawmix other than limestone) depend
on the purity of the limestone. Some of the second raw materials
used are: clay, shale, sand, iron ore, bauxite, fly ash and slag.
When a cement kiln is fired by coal, the ash of the coal acts as a
secondary raw material.
Country: |
India |
Model No: |
BS EN 197
|
FOB Price: |
(Negotiable)
Get Latest Price
|
Place of Origin: |
India |
Price for Minimum Order: |
- |
Minimum Order Quantity: |
500 Metric Ton |
Packaging Detail: |
50 Kg PP Bag |
Delivery Time: |
7-10 days after receipt of Payment |
Supplying Ability: |
5000 Metric Ton per Month |
Payment Type: |
T/T, L/C |
Product Group : |
Construction Material
|