How is geopolymer cement made?

Geopolymer cements are formed by dissolving alumi- nosilicate material in a strong alkaline solution. The resulting paste can be mixed with aggregates and cured to form concrete with strength and elastic characteristics similar to those of portland cement concrete.

What is geopolymer PDF?

Geopolymer is obtained by activating industrial by-products, which include blast furnace slag, fly ash, steel slag, phosphorus slag etc, with alkali activators, such as the sodium silicate, sodium carbonate and sodium hydroxide etc.

How many types of geopolymer cement are there?

Presently, there are two types based on siliceous (EN 197) or Class F (ASTM C618) fly ashes: Type 1: alkali-activated fly ash geopolymer (user-hostile):

What are the uses of geopolymer cement?

Applications of Geopolymer Concrete This concrete has been used for construction of pavements, retaining walls, water tanks, precast bridge decks. Recently world’s first building Structural Building, The University of Queensland’s Global Change Institute (GCI) has been constructed with the use of geopolymer concrete.

What are the ingredients of geopolymer concrete?

Composition of Geopolymer Cement Concrete Mixes

• Fly ash,
• GGBS,
• Fine aggregates and.
• Coarse aggregates.
• Catalytic liquid system (CLS): It is an alkaline activator solution (AAS) for GPCC. It is a combination of solutions of alkali silicates and hydroxides, besides distilled water.

What is meant by geopolymer concrete?

Geopolymer concrete is a type of concrete that is made by reacting aluminate and silicate bearing materials with a caustic activator, such as fly ash or slag from iron and metal production. It can be a suitable substitute for ordinary Portland cement (OPC).

What are the chemicals used in geopolymer concrete?

The Geopolymer concrete was prepared using Fly Ash, Manufacturing Sand, Coarse aggregates, Sodium Hydroxide and Sodium Silicate.

What is the advantage of geopolymer concrete?

Benefits of geopolymer significantly lower CO2 emissions than OPC concretes – up to~90% better thermal insulation properties. higher temperature/fire resistance. providing a viable use for ‘waste’ materials which are often disposed in landfill.

What are the properties of geopolymer cement?

Their unique properties which include high early strength, low shrinkage, freeze-thaw resistance, sulphate resistance and corrosion resistance, make them ideal for long term containment in surface disposal facilities. These high-alkali cements do not generate any Alkali-Aggregate-Reaction.

What are the advantages of geopolymer concrete?

Geopolymer concretes offer a number of benefits over conventional OPC concrete including:

• significantly lower CO2 emissions than OPC concretes – up to~90%
• better thermal insulation properties.
• higher temperature/fire resistance.
• providing a viable use for ‘waste’ materials which are often disposed in landfill.

What is geopolymer cement made of?

What are the limitations of geopolymer concrete?

Geopolymer concrete requires special handling and it is difficult to create. It requires the use of alkalis, such as sodium hydroxide/ sodium silicate, that can be harmful to humans. GPC should be cured at 60-70 degrees celsius.

What are the constituents of geopolymer concrete?

Two main constituents of geopolymers are: source materials and alkaline liquids. The source materials on alumino-silicate should be rich in silicon (Si) and aluminium (Al). They could be by-product materials such as fly ash, silica fume, slag, rice-husk ash, red mud, etc.