Portland Composite Cement (PCC)

INTRODUCING 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.

Both slag & fly ash (PFA) are used in PCC. Percentage of SiO2 in PFA is higher than slag which is advantageous to gain more long-term strength and ensure durable concrete. This type of cement is used for large constructions all around the world and it has been used during the last few decades.

The hydration process of normal cement produces Calcium Silicate Hydrate CHS & Calcium Hydroxide Ca(OH)2. Calcium Hydroxide Ca(OH)2 does not contribute to gain strength and it is the weak part of reaction which is not suitable for concrete. Since PFA contains higher portion of reactive silica and slag contains alumina, it helps to convert Ca(OH)2 into CSH to gain further strength.

ADVANTAGES OF PCC IN CONCRETE

  • Improved pumpability
  • Improved fresh concrete properties
  • Lower heat of hydration
  • Higher long term strength
  • Low permeability, dense structure
  • Optimum early strength
  • Low effective alkali content
  • High chemical resistance (Sea water, chloride diffusion, sulphate attack)
  • Compactability

TECHNICAL SPECIFICATIONS

CEM-II/A-M , 42.5 N

Clinker 80-94 %
Fly Ash, Slag, Limestone 6-20 %
Gypsum 0-5 %

Benefits of Crown PCC:
  • Reduces heat of hydration, which protect cracks
  • Gains long-term strength in concrete
  • Increases workability
  • Suitable for constructions of dwellings or residential buildings or retaining concrete, canals, channels, & edging productions, in plastering, & mortar applications
  • Also suitable for ready-mixed concrete where high compressive strength is not required

PROPERTIES

FINENESS

Crown Cement is tested for fineness by Blaine’s air permeability method.

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Crown Cement is tested for fineness by Blaine’s air permeability method. The specific surface of cement is 300-380 m2/kg.

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SOUNDNESS

Crown Cement is tested for soundness by the Le-Chatelier method and autoclave test.

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Crown Cement is tested for soundness by the Le-Chatelier method and autoclave test. The unareated cement shall have an expansion of less than 2.00 mm (Le-Chatelier method) & 0.08% (Autoclave Method) respectively.

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SETTING TIME

The setting time of cement is tested by Vicat apparatus method. Initial setting time is not

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The setting time of cement is tested by Vicat apparatus method. Initial setting time is not less than 45 minutes. Final setting time is not more than 375 minutes.

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COMPRESSIVE STRENGTH

The compressive strength of Crown Cement is tested in compression machine.

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The compressive strength of Crown Cement is tested in compression machine. In 2 days it is ≥ 20 MPa. In 28 days it is ≥ 52.5 MPa.

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CHEMICAL

Insoluable residue (by mass) 5.0% max Total Chloride Content 0.10% max

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Insoluable residue (by mass) 5.0% max Total Chloride Content 0.10% max Alkali as Na2O 0.60% max

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QUALITY CONTROL

We ensure consistent quality control at every stage of production. Our plant is well supported

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We ensure consistent quality control at every stage of production. Our plant is well supported by a powerful in-house modern laboratory with the latest state-of-the-art equipment for quality control and continuous improvement in the products. In addition to the well equipped and furnished chemical and physical laboratory, we have highly qualified foreign trained chemists and technicians with long experience in the field of cement who are absolutely dedicated to their work.

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LAB TEST

Raw materials are tested in this lab before they are imported and sample of cement are also tested each

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Raw materials are tested in this lab before they are imported and sample of cement are also tested each and every hour during production. For quality assurance cement is tested on various parameters. For this, the chemists of M.I. Cement Factory Ltd. conduct the compressive strength test making concrete/mortal cubes of different test age-3 days, 7 days and 28 days, as per ASTM C-150, and 2 days & 28 days as per EN (European Standard) at its laboratory. Therefore we can deliver the highest quality cement to our customers.

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