International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 05 | May -2017
p-ISSN: 2395-0072
www.irjet.net
Evaluation of Fly Ash as Amended Liner and the Effect of Pore Fluids Amina S M1, Rani V2
1
Mtech: Geotechnical Engineering, Dept of Civil Engineering, Marian Engineering College, Kerala, India 2 Associate Professor, Dept of Civil Engineering, Marian Engineering College, Trivandrum, India
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Abstract - Major energy production in India is
hydraulic conductivity and low cation exchange capacity. Therefore amending fly ash with bentonite improves cation exchange capapcity, shrinkage and volume change behavior. Also fly ash- bentonite mix poses suitable strength to be used a liner system for landfill.
achieved by the thermal power plants. By- product from these plants mainly include fly ash and bottom ash. Effective utilization of fly ash is being mainly concentrated on in this paper. Fly ash even though have so many advantages in using as a liner it can’t be used alone since it is having high hydraulic conductivity and low cation exchange capacity. To overcome this, fly ash is mixed with bentonite. Amending fly ash with bentonite improves cation exchange capacity, shrinkage and volume change behavior. It also poses good strength to be used as a liner. When the liner is encountered with waste materials its properties get altered. This paper also studies the variation in geotechnical properties on addition of pore fluids with variation in concentration.
2. MATERIALS AND METHODS 2.1 SOIL Soil used in the study is Calcium bentonite. It was collected from Coimbatore. Engineering properties of it is listed in table 1. The scanning electron microscopic image of calcium bentonite is shown in fig 1. Table 1: Properties of calcium bentonite PROPERTIES Specific gravity Liquid limit (%)
Key Words: fly ash, liquid limit, plasticity index, UCC
Plastic limit(%) Plasticity index(%) Shrinkage limit Max dry density (g/cc)
1. INTRODUCTION
Landfills are required to effectively dispose of waste. If not properly planned landfill can lead to pollution of environment, ground water, soil contamination etc. to avoid this suitable liner system have to be provided so that these liners can prevent the percolation of the leachate to the surrounding soil. Fly ash when used alone meets some of the requirements of a liner but the most important disadvantage of using it alone is its high
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Impact Factor value: 5.181
52 224 12.54 1.463
OMC(%) UCC(kPa) Permeability(cm/s)
In India major energy consumption is achieved by the Thermal power plants. The environmental impact of these power plants include issues such as land use, waste management, water and air pollution caused by the coal mining, processing and the use of its products. Major bproduct released from the thermal power plants are the fly ash and the bottom ash. Main focus on this paper is the effective utilization of fly ash. About 110 million tones of coal ash is being generated every year which leads to degradation of land. As per a survey conducted by the National Power Corporation about 20000 hectares of the land is occupied by the ash ponds. It became very necessary to find out alternative routes for the disposal of fly ash and that due to its pozzolanic nature its use in geotechnical engineering field increased.
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VALUES 2.67 276
19.12 94.16 2.79×10-5
Fig- 1: SEM image of Calcium Bentonite
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