Crown Cement

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Description

Description

CROWN PORTLAND CEMENT:

As per specification of BDS EN 197-1:2003, CEM-1, 52.5 N Crown Portland Cement is a cement prepared by mixing clinker 95-100% and gypsum 0-5%. This cement is also called Portland Cement (PC). This is obtained by intimately mixing together calcareous and argillaceous materials, burning them at clinker temperature up to about 1450 degree celsius and grinding the resulting clinker (calcined product) at required fineness and finally mixed with gypsum to obtain cement. This cement is a finely ground mixture of calcium aluminates and silicates capable of setting and hardening by chemical reaction with water. It is a binding material, which is used in engineering constructions.

CROWN PORTLAND COMPOSITE CEMENT:

Crown Portland Composite Cement is CEM-II/A-M which is a cement consisting of Clinker, Gypsum, Pulverized Fuel Ash (PFA), Blast Furnance Slag and Limestone designated by the specifications of BDS EN 197-1: 2003; CEM -II/A-M (V-S-L), 42.5 N. PCC is the most suitable cement for constructions in Bangladesh. CEM – II /A-M contains 80-94% Clinker, which is substantially higher than CEM – II/B-M containing 65 – 79% Clinker that provide us extra advantage in strength development and increase concrete performance.

 

CROWN BLAST FURNACE CEMENT:

As per specification of BDS EN 197-1:2003, CEM-III/A, 32.5 N Crown Blast Furnace Cement is a cement prepared by mixing clinker 35-64 %, slag 36-65% and gypsum 0-5%. This cement is also called Blast Furnace Slag Cement. In Blast furnace cement, the slag as obtained from blast furnace is used. The slag is a waste product in the manufacturing process of pig-iron and it contains the basic elements of cement, namely, alumina, lime and silica. The properties of blast furnace cement are more or less the same as those of ordinary cement. Its strength in early days is less and hence it requires longer curing period. It proves to be economical as slag, which is a waste product, is used in is manufacture. The blast furnace cement is durable, but not suitable for use in dry arid zones. Concrete made with Blast Furnace Cement sets more slowly than concrete made with ordinary Portland cement, depending on the amount of Ground Granulated Blast furnace Slag (GGBS) in the cement, but also continues to gain strength over a longer period in production conditions. This result in lower heat of hydration and lower temperature rises and makes avoiding cold joints easier, but also means that quick setting is required.

Additional information

Additional information

Weight N/A
Types

CEM II/A-M, CEM-I / PC, CEM-III A

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Crown Cement
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