Volume No. 9 Issue No.: 3A Page No.: 986-994 January-March 2015

 

EXPERIMENTAL STUDY ON INFLUENCE OF WASTE TYRE FIBRES ON STRENGTH OF COMPACTED CLAYEY SOIL-FLY ASH MIXES

 

Das Tapas* and Singh Baleshwar

Department of Civil Engineering, Indian Institute of Technology, Guwahati (INDIA)

 

Received on : September 10, 2014

 

ABSTRACT

 

Fly ash is a by-product of the combustion of pulverized coal in thermal power plants. Tyre buffing is a by-product of waste auto tyres and is elongated in shape and can be utilised as fibre reinforcement elements. Both the waste materials can be mixed with local soils available near the construction sites to create a new soil mix, as an effective means of disposal and utilization without adversely affecting the environment. An experimental study has been carried out to investigate the influence of randomly oriented tyre buffings on the triaxial compression behaviour of clayey soil-fly ash mixes. A Class F fly ash and waste car tyre fibres were added as additive and reinforcement material to a clayey silt soil. Compacted specimens were prepared at the corresponding optimum moisture content and maximum dry density. The results indicate that the stress-strain relationship and ductility of the specimens are substantially affected by the inclusion of the two waste materials. When fly ash alone is added to the soil, the stiffness and peak strength increase whereas ductility is reduced. When tyre fibres are added to the soil-fly ash mixes, strength decreases and the behaviour changes to a ductile one.

 

Keywords : Fly ash, Tyre buffing, Triaxial compression, Stress-strain, Strength

 

 

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