25-06-2014, 11:09 AM
SOIL STABILIISATION USING RAW PLASTIC BOTTLES
SOIL STABILIISATION USING RAW PLASTIC BOTTLES.pdf (Size: 151.48 KB / Downloads: 264)
ABSTRACT
: Soil stabilisation is any process which improves the physical properties of soil, such as increasing shear
strength, bearing capacity etc. which can be done by use of controlled compaction or addition of suitable admixtures like
cement, lime and waste materials like fly ash, phosphogypsum etc. The cost of introducing these additives has also
increased in recent years which opened the door widely for the development of other kinds of soil additives such as
plastics, bamboo etc. This new technique of soil stabilisation can be effectively used to meet the challenges of society, to
reduce the quantities of waste, producing useful material from non-useful waste materials. Use of plastic products such as
polythene bags, bottles etc. is increasing day by day leading to various environmental concerns. Therefore the disposal of
the plastic wastes without causing any ecological hazards has become a real challenge. Thus using plastic bottles as a soil
stabiliser is an economical utilization since there is scarcity of good quality soil for embankments. This project involves the
detailed study on the possible use of waste plastic bottles
INTRODUCTION
bearing power of the soil by the use of controlled
compaction, proportioning and/or the addition of suitable
admixture or stabilisers. The basic principles of soil
stabilisation are:
x Evaluating the properties of given soil.
x Deciding the lacking property of soil and choose
effective and economical method of soil stabilisation.
x Designing the stabilised soil mix for intended stability
and durability values.
Stabilisation can increase the shear strength of a soil and/or
control the shrink-swell properties of a soil, thus improving
the load bearing capacity of a sub-grade to support
pavements and foundations. Stabilisation can be used to
treat a wide range of sub-grade materials from expansive
clays to granular materials. The most common
improvements achieved through stabilisation include better
soil gradation, reduction of plasticity index or swelling
potential, and increases in durability and strength. In wet
weather, stabilisation may also be used to provide a
working platform for construction operations. These types
of soil quality improvement are referred to as soil
modification. Benefits of soil stabilisation are higher
resistance values, reduction in plasticity, lower
permeability, reduction of pavement thickness, elimination
of excavation, material hauling and handling, and base
importation, aids compaction, provides all-weather ac
RESEARCH SIGNIFICANCE
For many years, road engineers have used additives such as
lime, cement and cement kiln dust to improve the qualities
of readily available local soils. Laboratory and field
performance tests have confirmed that the addition of such
additives can increase the strength and stability of such
soils. However, the cost of introducing these additives has
also increased in recent years. This has opened the door
widely for the development and introduction of other kinds
of soil additives such as plastics, bamboo, liquid enzyme
soil stabilizers etc.
Soil stabilisation using raw plastic bottles is an alternative
method for the improvement of subgrade soil of pavement.
It can significantly enhance the properties of the soil used
in the construction of road infrastructure
MATERIALS AND METHODOLOGY
lateritic soil, plastic bottles (both cut and uncut), sea sand
and synthetic threads were used.
The Standard Proctor Compaction tests were done to assess
the amount of compaction and the water content required in
the field [1]. The water content at which the maximum dry
density is attained is obtained from the relationships
provided by the tests.
The California Bearing Ratio test was conducted to
determine the optimum amount of plastic strips in soil. This
is done by mixing soil with varying percentages (0.0%,
0.2%, 0.4% etc.) of plastic strips in soil and the 4 day
soaked CBR Value is obtained. [2].Plate load tests were
conducted with plain lateritic soil, soil stabilised with full
bottles, soil stabilised with bottles cut to two halves and
soil stabilised with optimum percentage of plastic strips[3].
Load-settlement graphs for each plate load test were drawn.
For each load-settlement graph, the load corresponding to
4mm settlement was noted. The ultimate load and
corresponding settlement of the plate is also determ
RESULTS AND DISCUSSIONS COMPACTION TEST
From the compaction curve, the maximum dry density and
optimum moisture content were obtained as 18.95kN/m3
and 11.22 % respectively. This is used for finding the bulk
density of the soil filled in the tank for plate load test. The
California Bearing Ratio test was also carried out by
mixing the soil with optimum moisture content
CONCLUSIONS
Use of plastic products such as polythene bags, bottles,
containers and packing strips etc. is increasing day by day.
The disposal of the plastic wastes without causing any
ecological hazards has become a real challenge to the
present society. Thus using plastic bottles as a soil
stabiliser is an economical and gainful utilization since
there is scarcity of good quality soil for embankments and
fills. Thus this project is to meets the challenges of society
to reduce the quantities of plastic waste, producing useful
material from non-useful waste materials that lead to the
foundation of sustainable society