Volume No. 10 Issue No.: 1 Page No.: 65-72 July-September 2015

 

IMPROVEMENT OF SHEAR STRENGTH OF CLAYEY SOIL USING RANDOMLY DISTRIBUTED PET BOTTLE STRIPS

 

Raghu P.V.,* Mukherjee S.P. and Chakrabarti S.

Department of Civil Engineering, Jadavpur University, Kolkata (INDIA)

 

Received on : January 10, 2015

 

ABSTRACT

 

Waste plastics impart adverse environmental problems like clogging in drainage system and need of large space required for solid waste disposal in the metropolitan and over crowded cities. Recycling of plastic waste from water bottles is becoming one of the challenges worldwide. The bottled water is the fastest growing beverage industry in the world. Plastic bottle recycling has not kept pace with the dramatic increase in sale of virgin resin Poly Ethylene Terephthalate (PET) and the same are to reduce/reuse/recycle that has emerged as one of the important need for sustainable development. The introduction of randomly distributed plastic fibers in reinforcing soil has enabled geotechnical engineers to effectively use unsuitable soils as reliable construction material and foundation medium in a wide range of civil engineering applications for ground improvement, sub bases and sub grade preparation in building and road construction. In order to use waste plastic material as means of waste management an experimental work has been undertaken with one type of locally collected clayey soil and two types of amended soil (clayey soil with 10% sand and 20 % sand) reinforced with randomly mixed PET bottle strips of different percentages (varying from 0.5% to 2% by weight) with different values of aspect ratio (length/width) with constant width of 5 mm. The work has been done with the objective of examining the improvement of shear strength parameters of a clayey soil by mixing PET bottle strips. A series of triaxial compression tests were carried out adopting standard procedures on those three types of soil with different percentages of plastic strips with varying aspect ratio as mentioned. It is observed that angle of internal friction (?) enhances with the elevated percentage of sand up to addition of 1 % of plastic strips by weight for values of aspect ratio (length/width) 1, 2 and 3. However beyond this value the angle of internal friction descends gradually, when other parameters do not vary. The present study provides an approach in improvement of strength of weak soil as well as in recycling plastic waste and also brings out change in shear strength parameters of soil with mixing of PET bottle strips in different proportions for its use in geotechnical engineering.

 

Keywords : Soil Improvement, Shear strength, Fiber reinforcement material, Recycling PET waste

 

 

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