Portland Composite CementCement
Portland Composite Cement (PCC)
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Portland Composite Cement (PCC)
Portland composite cement is a hydraulic binder. It is produced by grinding clinker and a certain amount of gypsum, fly ash, slag and limestone.
Source of raw materials
Bashundhara cement is produced without compromising the quality. We collect best quality clinker from Thailand, China, Korea & Vietnam directly to maintain superior quality of Bashundhara Cement.
Active ingredients are:
- Portland clinker
Mineral Component (MIC):
Fly ash – Pozzolan component.
Blast furnace Slag – hydraulic component.
Limestone – inert component.
Gypsum – Retarding agent to control setting time.
Clinker:
Clinkers are formed by the heat processing of cement elements in a kiln. Limestone, clay, bauxite and iron ore sand in specific proportions are heated in a rotating kiln at 2770◦F (1400◦C) unit they being to form cinder lumps, which are also known as cement clinkers.
Properties of different types of Mineral Components in cement:
Fly ash:
Fly ash is a byproduct of coal after burning for different purposes and subsequently crushed to powder level to be used for the manufacture of cement.
Advantages of Fly ash on cement:
- More fineness.
- Increase long age strength
Due to Pozzolanic and latent hydraulic properties, Bashundhara Portland Composite Cement (PCC) gives high long term concrete strength. In general, strength gains up to 90 days for other cement whereas Bashundhara Portland Composite Cement (PCC) gaining strength up to 5 to 10 years. Steady strength gaining features gives Bashundhara Portland Composite Cement (PCC) extra advantages for durable concrete.
- Less heat of hydration
The Pozzolanic reaction between pozzolan and lime generates less heat, resulting in reduced thermal cracking when pozzolans are used to replace Portland cement. During the manufacturing process Bashundhara Cement (PCC) specially designed to have low heat of hydration.
Reduce permeability.
Greater workability.
Improve durability.
Reduced bleeding.
Slag:
Slag is a byproduct of smelting ore to separate the metal from the unwanted materials. It can usually be considered to be a mixture of metal oxides and silicon dioxide. The most common sources of slag are manufacture of pig iron.
Advantage of slag on cement:
- Higher compressive and flexural strength
- High resistance to sulfate & chloride attack
Corrosion of reinforcement is the most widespread cause of deterioration in concrete. The expansion produced by corrosion of embedded reinforcement in concrete causes the surrounding concrete to crack and spall.
Concrete manufactured with Bashundhara Cement, produces lower permeable and denser concrete, which does not allow penetrating water or air inside finished concrete. This also supplements the resistance to Sulpahate and Chloride attacks.
More consistent plastic and hardened properties.
Less possibility of bleeding and segregation.
Less water demand.
Better concrete workability.
Lighter color.
Easier finish ability.
Environmental friendly structures.
During pozzolanic reaction there is leaching of lime in concrete. Such leaching produces the concrete to be porous and such concrete becomes very prone to various environmental aggressions. Bashundhara Portland Composite Cement reacts with this excess lime and makes extra CSH (Calcium Silicate Hydrate) gel resulting more strength and make environmental friendly structure.
Limestone:
Limestone is sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). Limestone’s has very pleasant appearance, can be polished to a smooth shiny surface and works as filler.
Gypsum:
Gypsum is a mineral and hydrated calcium sulfate in chemical form. Gypsum plays a very important role in controlling the rate
