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.

DURABILITY/EARTHQUAKE RESISTANCE

Crown PCC will give you strong & durable concrete as compared to other cements in the markets.

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Crown PCC will give you strong & durable concrete as compared to other cements in the markets. As this cement contains fewer amounts of alkali, magnesia & free lime, it gives long term strength & durable concrete. This durability features minimize construction damage and help in earthquake/seismic resistant design.

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HIGHER LONG TERM STRENGTH

Ordinary Cement usually gains strength for only 90 days, whereas Crown PCC cement continues to gain strength for a much longer time

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Ordinary Cement usually gains strength for only 90 days, whereas Crown PCC cement continues to gain strength for a much longer time / period due to its pozzolanic and latent hydraulic reaction. Its steady strength gaining feature gives it extra advantage for durable concrete.

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IMPROVED WORKABILITY

Concrete mix with crown PCC generally requires less water usually between 5 & 10 % by comparison with PC mix.

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Concrete mix with crown PCC generally requires less water usually between 5 & 10 % by comparison with PC mix. This gives higher strength. PFA & Slag particles work like a ball bearing around coarse cement particles. This increases the workability & eases placing of the concrete. PFA & Slag act like a plasticizer.

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MINIMIZE BLEEDING

Concrete made of crown PCC is cohesive & has a reducing bleeding capacity.

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Concrete made of crown PCC is cohesive & has a reducing bleeding capacity.

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HIGH CHEMICAL RESISTANCE

Concrete mixes with PCC produce lower permeable dense concrete, which does not allow to penetrate

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Concrete mixes with PCC produce lower permeable dense concrete, which does not allow to penetrate water or air inside finished concrete. As a result reinforcement in concrete can stay long & sturdy longer. This also supplemented with resistance to sulphate and chloride attacks.

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SUITABLE FOR CONSTRUCTION WORKS IN BANGLADESH

The use of ordinary cement in concrete allows air, water and other pollutants to enter inside which corrodes

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The use of ordinary cement in concrete allows air, water and other pollutants to enter inside which corrodes reinforcements & deteriorates concrete which is not visible from outside. Crown PCC is an ideal cement whose PFA particles make dense & impermeable concrete. Consequently, air and water don’t enter into concrete keeping the reinforcements inside intact. Besides, crown PCC will give your constructions safe protection from pollution caused by humidity & flood water.

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CONSISTENCY IN QUALITY

Concrete made of crown PCC is cohesive & has a reducing bleeding capacity.

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We make all efforts in maintaining continuous high level of quality. We ensure the best raw materials sourcing from the best sources & maintain strict vigilance in every step of the cement production process. After production we test the cement every hour at our state-of-the-art laboratory to ensure the consistency in product quality.

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Lower Heat of Hydration

Lower Heat of Hydration: PCC is made to have low heat of hydration. This results in lower shrinkage & easier curing

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Lower Heat of Hydration: PCC is made to have low heat of hydration. This results in lower shrinkage & easier curing

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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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