portland cement manufacturing process ppt pakistan

ppc cement manufacturing process - portland pozzolana cement plant | agico

ppc cement manufacturing process - portland pozzolana cement plant | agico

What is Portland pozzolana cement? The hydraulic cementitious materials made of Portland cement clinker, pozzolanic material, and a proper amount of gypsum are all called Portland pozzolana cement (PPC cement). It is a kind of blended cement which is manufactured by mixing and fine-grinding silicate cement clinker, pozzolanic material, and gypsum.

Pozzolanic materials contain active silica and aluminum and usually do not have any cementitious properties. But when they are mixed with water and lime at ambient temperatures, they will react with calcium hydroxide to form compounds possessing cementitious properties. The commonly used pozzolanic materials can be classified as natural or artificial:

Portland pozzolana cement shall be manufactured by mixing and inter-grinding Portland cement clinker, pozzolanic materials, and gypsum. The manufacturing process is approximately the same as ordinary Portland cement, which can be divided into four processes: raw material crushing, raw material grinding, clinker calcination, and cement grinding.

Limestone and clay are the main material for Portland cement production. After mining, these raw material stones are unloaded by trucks and sent into crushers for reducing particle size. Then they are piled in a pre-homogenization yard waiting for processing.

Fine particle size raw materials are fed into the raw mill in a desired proportion for further particle size reduction, then they are stored in silos, meanwhile completing the material blending and homogenization process.

Cement raw meals are sent into a cement rotary kiln to be calcined under a high temperature. After several chemical reactions are produced, some spherical gray particles, what we called clinker, are formed. In cement cooler, these hot clinkers will be cooled to a normal temperature.

After cooling, the clinker is mixed with pozzolanic materials and gypsum in a required proportion and then sent to the cement mill for final grinding. The cement powder is usually stored in cement silos, then bagged and stored in the warehouse.

In the Portland pozzolana cement manufacturing process, we need a variety of cement equipment. AGICO, as a cement plant supplier in China, offers different cement solutions and cement manufacturing equipment.

Portland pozzolana cement, portland slag cement, and portland fly ash cement are all made by adding active admixture and an appropriate amount of gypsum based on Portland cement clinker. They are similar in nature and scope of application, so they can be used interchangeably in most cases. However, the physical properties and characteristics of the active admixture are different, which makes the three types of cement have their unique characteristics.

Slow setting and hardening, low early strength, and high late strength. The clinker content of the three kinds of cement is small, and the secondary hydration reaction is slow, while their later strength exceeds the ordinary Portland cement of the same grade.

Sensitive to temperature and humidity, suitable for high-temperature curing. When the three types of cement are cured at high temperatures, the hydration of the active mixture and clinker will be accelerated, and the early strength is improved without affecting the development of the later strength. Ordinary Portland cement, although the use of high-temperature curing can improve the early strength, the development of later strength will be affected.

Good corrosion resistance. They have good corrosion resistance and are suitable for the environment containing sulfate, magnesium salt, soft water, etc. However, when the corrosion resistance requirements are high, it is not suitable for the application.

Poor frost resistance. Slag and fly ash are easy to bleed to form connected pores. As to pozzolana, it has a large water storage capacity, which will increase the internal pore number. Therefore, the frost resistance of the three types of cement is poor.

Composite Portland cement: the early strength of composite Portland cement is higher than slag (or pozzolana, fly ash) cement, closes to ordinary Portland cement. It has low hydration heat, good corrosion resistance, impermeability, and frost resistance.

AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.

portland cement - types, manufacturing & functions of ingredients

portland cement - types, manufacturing & functions of ingredients

Hydraulic Cement sets and hardens by action of water. Such as Portland Cement In other words it means that hydraulic cement are: Any cements that turns into a solid product in the presence of water (as well as air) resulting in a material that does not disintegrate in water.

The 3 primary constituents of the raw materials used in the manufacture of Portland Cement are: a) Lime b) Silica c) Alumina Lime is derived from limestone or chalk Silica & Alumina from clay, shale or bauxite

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