Volume No. 3 Issue No.: 4 Page No.: 1211-1222 April-June 2009

 

USE OF FLY ASH IN CONSTRUCTION INDUSTRIES FOR SUSTAINABLE DEVELOPMENT

 

Radhakrishna*, Renuka Devi M.V. and Udayashankar B.C.

Department of Civil Engineering, RV College of Engineering, Bangalore (INDIA)

 

Received on : January 28, 2009

 

ABSTRACT

 

Portland cement concrete is the most widely used manufactured product in the world. It is the popular choice among all the building materials. The global use of concrete is second only to water. More than a tonne of concrete is produced every year for each person in the planet, approximately six billion tonnes per year. Each ton of cement produced releases an equal amount of CO2. Since it is a major contributor to the greenhouse effect and the global warming of the planet, it is necessary to consider this with very severe regulations and limitations. The demand for industrial and domestic energy results in the production of a large volume of fly ash from solid coal fuel, which will increase in the world on an unprecedented scale in future. Therefore, fly ash should not only be disposed of safely to prevent environmental pollution, but should be treated as a valuable resource. The installation of new cement plants substantially increases the CO2 emissions, and installation of coal-fired thermal power plants results in large amount of coal ashes.
Fly ash can be used part replacement of cement in concrete. Concrete can be manufactured without using conventional Portland cement. Fly ash, lime and Gypsum ( FaL-G) can be used in construction. Fly ash/ slag can be activated using high alkaline solution. The resulting material is termed as geopolymer. Both FaL-G and Geopolymer are termed as no cement concrete.
All the three methods of utilizing fly ash are considered in construction in different forms. Cement can be replaced partly with fly ash for better and strength and durability. FaL-G and geopolymer can be used in the form of concrete and masonry blocks. These new materials posses

 

Keywords : Fly ash, FaL-G, Geopolymer, Sustainable development, Concrete, Compressive strength.

 

 

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