Advantages And Disadvantages Of Fly Ash
In recent years, attempts to increase the utilization of fly ash to partially replace the use of Portland cement in concrete are gathering momentum. Most of this by-product material is currently dumped in landfills, creating a threat to the environment. Instead, the source of materials such as fly ash, that are rich in Silicon (Si) and Aluminium (Al), are activated by alkaline liquids to produce the binder. Keywords: geopolymer; fly-ash, rice-husk ash Introduction: Geopolymer is used as the binder, instead of cement paste, to produce concrete. The geopolymer paste binds the loose coarse aggregates, fine aggregates and other unreacted materials together to form the geopolymer concrete. The manufacture of geopolymer concrete is carried out using …show more content…
It can also contribute to LEED points. • It improves the strength over time and thus, it offers greater strength to the building. DISADVANTAGES OF FLY ASH: • The quality of fly ash to be utilized is very vital. Poor quality often has a negative impact on the concrete. • The poor quality can increase the permeability and thus damaging the building. • Some fly ash, those are produced in power plant is usually compatible with concrete. RICE HUSK • Combustion of rice hulls affords rice husk ash (acronym RHA),. This ash is a potential source of amorphous reactive silica, which has a variety of applications in materials science. Most of the ash is used in the production of Portland cement When burnt completely, the ash can have a Blaine number of as much as 3,600 compared to the blain number of cement between 2,800 to 3,000, meaning it is finer than cement. • Silica is the basic component of sand, which is used with cement for plastering and concreting. This fine silica will provide a very compact concrete. The ash also is a very good thermal insulation material. CHEMICAL COMPOSITION: TECHNICAL SPECIFICATIONS : SiO2 – Silica 85 % minimum Humidity 2 %
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