Volume No. 3 Issue No.: 2 Page No.: 421-426 Oct-Dec 2008

 

STUDIES ON IMMOBILIZATION OF INCINERATOR ASH IN CONCRETE

 

S. Shrihari* and R.G.D’Souza

Department of Civil Engineering, NITK, Surathkal, Karnataka (INDIA)

 

Received on : July 12, 2008

 

ABSTRACT

 

Concrete has the ability to recycle an array of byproduct wastes from other industries. Storage of these industrial wastes would otherwise require vast areas of land and cause pollution, as they would contain small amounts of toxic metals. Incorporating wastes into concrete as a cement substitute on a selective basis could help to solve some of the problems encountered in waste disposal of some industries. However before waste can be used on a large scale in concrete, the properties of the resulting concrete needs to be studied in order to ensure that the resulting material is suitable for use in construction and is not an environmental concern In this paper the utilization of incinerator ash obtained as waste, on incinerating the effluent treatment plant sludge cake from a dyes and intermediaries industry in concrete is discussed. The ash was initially characterized to understand its physical and chemical properties. The ash was then mixed with concrete replacing varying amounts of cement and concrete blocks were cast which were subjected to compressive strength test. To rule out environmental concerns the samples and the contact water was chemically analyzed using SEM and Voltammetry. The results obtained were promising and showed that the variation in compressive strength upto certain percentage of replacement of cement with ash was within limits. The chemical analysis of water in contact with the ash-concrete blocks showed that the amount of toxic elements leaching out were not of much concern. The results indicate that the utilization of incinerator ash in concrete in large scale is a viable option.

 

Keywords : Incinerator ash, SEM, Voltammetry, Cement replacement

 

 

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