International Research Journal of Engineering and Technology (IRJET) Volume: 04 Issue: 02| Feb -2017
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e-ISSN: 2395 -0056 p-ISSN: 2395-0072
STABILIZATION OF BLACK COTTON SOIL USING COIR PITH Arthi priya.D 1, Asst Prof.R.Gopalakrishnan2, Asst Prof. M.Jawahar 3
UG Student, Department of Civil Engineering, Pollachi Institute of Engineering & Technology, Tamil Nadu, India Assistant Professor , Department of Civil Engineering, Pollachi Institute of Engineering & Technology, Tamil Nadu, India
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Abstract - Black cotton soil is typical expansive soil have
method for improving the properties of soil and pavement system performance. For any given soil many stabilization methods, using different stabilizing agents, may be effective to improve the soil properties in-place rather than removing and replacing the material. Availability or financial considerations may also be the determining factor on which a stabilizing agent is selected. This p a p e r aims to present the studies on chemical stabilization of an expansive soil using coir pith. The investigations done earlier on untreated coir pith on soil indicate that strength properties soils decrease but when the NAOH is added with coir pith the strength is increase randomly. Then coir pith added with soil it increase the bearing capacity of foundation soil. Coir pith, a fluffy and spongy material, is a part of coir waste that is dumped near the coir manufacturing units in Pollachi. These are conventionally disposed of by burning which leads to many environmental problems. So finding out an efficient way for the disposal of coir waste is of critical importance.
inherent property of shrinking when they are dried and swelling water is absorbed. For all structure, the foundation is very important and it has to be strong to support the entire structure. In order for the foundation to be strong, the soil around it plays a very critical role. To work on soils, we need to have proper knowledge about their properties and factors which affect their behavior. Expansive soils always create problems more for lightly loaded structures than moderately loaded structures. In this paper the experimental results obtained in the laboratory on expansive soils treated with industrial waste Coir Pith (CP) treated with 5% of NaOH as a stabilizer are presented. A study is carried out to check the improvements in the properties of expansive soil with Coir Pith in varying percentages. The test results such as liquid limit, Modified proctor compaction, and Unconfined Compression strength test obtained on black cotton soil mixed at different proportions of Coir Pith as an admixture ranging from 2%, 2.5%, 3%, 3.5% and 4%. The plasticity index (PI) of 2% & 3% addition of coir pith is less compared to untreated BC Soil. The max dry density (MDD) of 2% &3% addition of coir pith is more compare to untreated BC Soil, optimum moisture content (OMC) is reduced compare to BC Soil. The unconfined compressive strength (UCS) for BC Soil treated with 2%and 3% compare to untreated BC soil.
2. OBJECTIVE OF THE STUDY
Roads running on black cotton soils are known for bad condition and unpredictable behavior. Modification of black cotton soils by chemical admixtures is a common method for stabilizing the swell- shrink tendency of expansive soils. Advantages of chemical stabilization are that they reduce the swell-shrink tendency of the expansive soils and also render the soils less plastic. Stabilization of problematic black cotton soil with coir pith and NaOH agent is neither economical nor ecofriendly and increases carbon footprints.
Key Words: Coir pith, Black cotton soil, Strength Test, Maximum dry density, Optimum moisture content.
1. INTRODUCTION Engineers a r e o ft en faced w i t h t h e Problem of constructing facilities on or with soils, which do not possess sufficient strength to support the loads imposed upon them either during construction or during the service life of the structure. Many areas of India consist of soils with high silt contents, low strengths and poor bearing capacities. Stabilization of soils is an effective
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In this project, Coir pith was used as one such stabilization material, in the construction of foundation and pavement work. The improvement of t he soil stability due to coir pith has been attributed to main mechanisms reduce the voids on s o i l . The s o i l u s e d i n t h i s
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