What is geopolymer concrete ppt?
Geopolymer concrete is an innovative, eco-friendly construction material. It is used as replacement of cement concrete. In geopolymer concrete cement is not used as a binding material. Fly ash, silica-fume, or GGBS, along with alkali solution are used as binders.
What is geopolymer concrete PDF?
Geopolymer concrete is an innovative construction material which shall be produced by the chemical action of inorganic molecules. Fly Ash, a by-product of coal obtained from the thermal power plant is plenty available worldwide.
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 application of geopolymer concrete?
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 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.
Who invented geopolymer?
Geopolymers are amorphous three-dimensional alumina-silicate binder materials, which were first named and developed by Davidovits in the late 1970s (Davidovits, 1989).
How do Geopolymers work?
Geopolymerization occurs at ambient or slightly elevated temperature, where the leaching of solid aluminosilicate raw materials in alkaline solutions leads to the transfer of leached species from the solid surfaces into a growing gel phase, followed by nucleation and condensation of the gel phase to form a solid binder …
What are the properties of geopolymer concrete?
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 limitations of geopolymer concrete?
Disadvantages of Geopolymer Concrete:
- They are difficult to produce.
- Also, requires special handling.
- Chemicals like sodium hydroxide are harmful to humans.
- They have a high cost of alkaline solutions.
- Pre-mixed with pre-mix or pre-cast material.
- The geo-polymerization process is sensitive.
- It loses uniformity.
What is geopolymer simple words?
Geopolymers are chains or networks of mineral molecules linked with co-valent bonds. They have following basic characteristics: a) Nature of the hardened material: X-ray amorphous at ambient and medium temperatures. X-ray crystalline at temperatures > 500°C.
How strong is geopolymer?
The highest compressive strength of the geopolymer specimen under the study is 50.24 MPa after exposure to 100 °C. The strength declined consistently by 11.01, 34.95, 63.28, 82.84, and 97.37% at 300, 500, 800, 1000, and 1200 °C respectively.
What is the principle of geopolymer concrete?
It relies on minimally processed natural materials or industrial byproducts to significantly reduce the carbon footprint of cement production, while also being highly resistant to many common concrete durability issues. Geopolymer cements exist which may cure more rapidly than Portland-based cements.
What are the disadvantages of geopolymer concrete?
How do geopolymers work?