International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 03 | Mar -2017
p-ISSN: 2395-0072
www.irjet.net
Compaction and seepage characteristics of Fly ash mixed with Bentonite Mayank Pandey1, Prof Rajesh Jain2 1ME
Scholar, 2Associate Professor Jabalpur Engineering College, Jabalpur (M.P.)
------------------------------------------------------------------------------------------The present study has been carried out to find out the compaction properties and seepage characteristics of fly ash and bentonite mixtures. Laboratory tests were conducted at different proportions of fly ash and bentonite. Fly ash, a waste generated by thermal power plants is as such a big environmental concern. The investigation reported in this paper is carried out to study the utilization of fly ash in lining applications with bentonite additive so as to provide an environmentally consistent way of its disposal and reuse. Fly ash is generated in tons as a residue from burning of coal in the power plants. The components of fly ash vary according to the type of coal being burned. But mainly all fly ash include substantial amounts of silicon dioxide (SiO2) (both amorphous and crystalline) and calcium oxide (CaO). Bentonite is clay formed as a result of chemical weathering of volcanic ash. It consists of montmorillonite. Due to its swelling properties, bentonite provides as a selfsealing, low permeability hydraulic barrier. Fly ash is cohesion less material and having very low compressive and shear strength however its strength can be increased by adding low cost cohesive materials such as lime and clayey soil whereas bentonite is clay having high swelling properties when it comes in contact with the water. Wastes are generated more and more with increasing industrialisation and population growth. Based on the safety level, these wastes can be controlled by different options such as waste reduction, separation and recycling, resources recovery through waste processing, waste transformation, and environmentally sustainable disposal on land. The most frequently used disposal option for solid waste in the landfill because of its low cost and efficiency. In the present study seepage and compaction characteristics of fly ash mixed with bentonite are studied to enable its use in various engineering applications such as land fill liner and subgrade material of pavements. Keywords: Fly ash, Bentonite, lining applications, subgrade material
Introduction Landfills are the most popular municipal solid waste disposal system. The design of liner is made so as to isolate the waste from the environment minimizing the passage of leachate into the groundwater. To ensure this the important characteristics for compacted landfill liners are selection of materials, hydraulic conductivity, strength, compressibility and contaminant retention capacity. Fly ash is the notorious waste product of coal based electricity generating thermal power plants, known for its ill effects on agricultural land, surface and sub-surface water pollution, soil and air pollution and diseases to mankind. Researchers have proposed few ways of reusing fly ash for variety of application. Fly ash particles are almost totally spherical in shape, allowing them to flow and blend freely in mixtures. With this in view, the present study purports to examine the suitability of fly ash as a landfill liner material. The major objective of this study is to maximize the use of fly ash for the liner application. Therefore, different fly ash-bentonite mixes were subjected to hydraulic conductivity, Shear strength and compressibility evaluation. Mishra1 et al. (2010) worked on mixtures of expansive soil such as bentonite with fly ash and pond ash can is used as compacted barriers. Lakshmikanth H2(2004) worked on the Properties of Fly ash as Hydraulic Barrier, Soil and Sediment Contamination. Yilmaz3 (2001) was carried out an investigation on the utilization of fly ash and bentonite mixture as a bottom and/or upper liner material at waste disposal areas. In this study, Catalagziflyash was mixed with bentonite, as binding material, at 10, 20 and 30 percentages (dry weight bentonite/dry weight Catalagziflyash) to obtain less permeable liner material 1. Alam J4 et el. (2012) also worked on the Seepage characteristics and geotechnical properties of fly ash mixed with bentonite. Bello5 (2013) worked on the basic attributes of a suitable liner. the presence of significant amount of a clay minerals and having a hydraulic conductivity less than or equal to 1Ă—10-7acm/s. Therefore, different fly ash-bentonite mixes were subjected to different tests to determine its swelling properties.
Š 2017, IRJET
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