One dimensional consolidation studies on compacted black cotton soil treated with up to 16%. Similarly the value of plasticity index is also reduced by increase in percentage of mix soil. Effect of sodium chloride on consistency limits of black cotton soil test on liquid limit and plastic limit was carried out for treated and untreated black cotton soil. The properties of black cotton soils as they affects the. Studies on black cotton soil stabilization using rbi grade 81. Stabilization of black cotton soil using alkali activated.
The expansive soils exhibit high plasticity, high compressibility, high swelling. The adsorbed water in clayey soils is leads to the plasticity of soil. A laboratory experimental program consisting of series of specific gravity, atterberg limits, compaction, california bearing ratio cbr, unconfined compression and consolidation tests was conducted on the untreated. Stabilization of black cotton soil using alkali activated fly ash ijirst volume 3 issue 02 075 index decreases from 47. Plasticity index is one of the important properties of soil to determine the behavior of soil in presence of water.
Plasticity, strength, permeability and compressibility. In this study, lime is used as a stabilizing material to stabilize the. So this parameter should be reduced to improve the black cotton soil. For studying the behaviour of black cotton soil with different percentage of kota stone slurry, the atterbergs limits. Adsorbed water in the clay particles allow the particles to slip over. Plastic limit, maximum dry density, optimum moisture content, and california bearing ratio were studied. Stabilization of soils is an effective method for improvement of soil properties and the pavement system performance.
The properties of black cotton soil can be modified by stabilizing the soil with the use of additives or by mechanical means. The effect of terrazyme on soil is permanent and the soil become biodegradable in nature. Pdf study of black cotton soil characteristics with. Analysis of engineering properties of black cotton soil.
From the laboratory test results it is observed that the addition of salt in black cotton soil significantly reduces the liquid limit, plastic index, swelling and plasticity index of soil with a. Study of black cotton soil characteristics with cement. Studied on effect of flyash on expansive soil, flyash consists of hollow spheres of silicon, aluminum and iron oxides and unoxidized carbon. Strength, physicochemical and morphological characteristics of fly. The possibility of good construction sites to build structures on black cotton soils is difficult due to their poor strength and deformation characteristics. It was observed that the liquid limit, plastic limit and plasticity index was.
Stabilization of black cotton soil by using fly ash and lime. Effect of lime on index properties of black cotton soil by. The test shows the liquid limit for bc soil samples are ranging 5560 and plastic limit for the same ranges 3040. It has been found that the liquid limit decreased from 45. In civil engineering aspects black cotton soil is giving hazardous problems to engineers. Effect of common salt nacl on index properties of black. Experimental studies suggest that shrinkage limit of black cotton soil gradually increased from 3. As the mix soil percentage is increased upto 15%, value of plasticity index is reduced by 30. It could be observed that, in general, soils have shown an immediate decrease in plasticity index upon addition of lime.
The tests carried out with different proportions of. The swelling property generally increases with increase in plasticity index. Effect of sodium chloride on geotechnical properties of. After identifying the various properties viz plastic limit, liquid limit, plasticity index, california bearing ratio test, unconfined. The black cotton soil bc soil deposits existing on the road alignment were fully replaced with cohesive non swelling cns soil having plasticity index pi value ranging between 5 to 15 and freeswelling index fsi ranging between 7 to 35 in the entire length of new carriageway fig 4. Roads running in black cotton soils are known for bad condition and unpredictable behavior for which the nature of the soil contributes to some extent.
Figure 4 shows the effect of sodium chloride on atterbergs limits of black cotton soil. As same reduction in plasticity index for black cotton soil 30% 40% 50% black cotton soil % soil 15 % %. Black cotton soil the black cotton soil which was used for this. Stabilization of black cotton soil using waste material. Black cotton soils become very hard in their dry state and contain high bearing capacity. Chavhan india the biggest handicap is to provide a complete abstractstabilization of black cotton soil bc soil is studied by using lime and fly ash.
Pdf geotechnical investigation of black cotton soils. By students of rajiv gandhi proudyogiki bhopal soil sample taken near rgpv campus. Introduction black cotton soils are inorganic clay of medium to high compressibility and form a major soil group of india. Improvement of stabilization characteristics of black. Comparative study of black cotton soil stabilization with. Laboratory study on cbr value of black cotton soil treated with crushed coconut shells 15. Effect on index properties of black cotton soil by alkali. Practical problems of highway construction in black cotton. Hence it is important to study the stabilization of black cotton soil by using fly ash and lime as stabilizers and on the engineering properties of black cotton soil stabilized with fly ashlime.
This variation creates so many geo technical problems. Stabilisation of black cotton soil using admixtures pankaj r. The test results have shown that increase in the clay content in the black cotton soil attributes an increase in the plasticity index. There is so many methods are available to improvement of black cotton soil. When liquid limit increases with lime addition, the. This work presents the results of laboratory tests conducted on black cotton soil mixed with microfine slag. From fig 5 it is observed that plasticity index decrease as percentage of eaf dust increase and it may be due to decrease in total soil mass content.
The locations of existence of black cotton soils are identified and the soil samples are. Effect of lime and brick dust on compaction and swelling. A laboratory experimental program consisting of series of specific gravity, atterberg limits, compaction, california bearing ratio cbr, unconfined compression and consolidation tests was conducted on the untreated and ps. Sample ii black cotton soil with stabilizer 5% lime sample iii black cotton soil with 5% blast furnace slag and stabilizer sample.
A study on engineering behavior of black cotton soil and. Further, relationships of plasticity index with liquid limit and optimum moisture content. A number of representative samples were evaluated for soil plasticity on both this and the adjacent properties, presented herein as figs. Pdf geotechnical investigation of black cotton soils researchgate. The type of soil is black cotton soil which is an expansive soil with high plasticity according to. It improves the quality of soil like cbr, durability and decreases the omc, plasticity index of soil. The following problems generally occur in black cotton soil high compressibility. Pdf study of black cotton soil characteristics with cement waste. In india, they are also known as black cotton soils due to their black colour and suitability for cotton crops. The value of liquid limit and plastic limit are used to classify fine grained soil. The poorest soil among all is black cotton soil bc soil. Results as obtained were compared with the indian standard code. Black cotton soils are highly plastic and compressible, when they are saturated. Effect of lime on the index properties of black cotton.
Pdf stabilization of soils is an effective method for improvement of soil properties and the pavement system performance. The improvement in the characteristics of stabilized soil was assessed by evaluating the changes in the physical and strength parameters of the. The identification tests were conducted on these collected soil samples to confirm whether it is a black cotton soil or not and to know the properties of the collected soil samples. Increase in unconfined compressive strength after 4 weeks of curing was reported as 246 to 404%. In india there is about 20% soil is black cotton soil. Most of the soils decreases the plasticity index by addition of lime and thereby increasing the workability thompson 19665.
Stabilization of black cotton soil using terrazyme civil. The study also revealed a progressive reduction of swelling pressure and liquid limit up to the addition of 16% rice husk ash by weight of the black cotton soil. Black cotton soil in this area is generally grayish brown to black in color and occur from 0. Liquid limit, plastic limit, california bearing ratiocbr and maximum dry density were analyzed. In our country expensive soil has liquid limit value ranging from 45100%, plasticity index from 2065% and shrinkage limit 914%. Liquid limit test of black cotton soil india youtube. Swelling properties of expansive soils treated with. The properties of black cotton soil include liquid limit ranging from 3045, plasticity index from 2025 percent, the activity ratio ranges from 1. For nonplastic and low plasticity index soils in which lime alone is not satisfactory for stabilization, the addition of fly ash may be needed to produce the necessary. Properties of black cotton soil properties of black cotton soil value specific gravity 2. Influence of blast furnace slag on the consistency limits. An experimental study of bioenzyme on black cotton soil. A correlation relationship between cbr and soil index properties were developed using nonlinear and multiple line ar regression analysis.
Terrazyme, soil stabilization, black cotton soil, cbr and ucs. The black colour in black cotton soil is due to the presence of titanium oxide in small concentration. Plasticity index of soil pi it is the numerical difference between the liquid limit and the plastic limit of a soil and indicates the magnitude of the range of the moisture contents over which the soil is in a plastic condition as defined by the tests. Stabilization of black cotton soil subgrade using sawdust. The suitability of using precipitated silica ps from the burning of rice husk was investigated to improve the geotechnical engineering properties of a black cotton soil. Reduction in plastic limit value for 30, 40, 50 % marble powder are respectively 9. Correlation between cbr values and index properties of.
Soil, there is less reduction in plastic limit value. This research dwells on how black cotton soil bcs could be stabilized and made a suitable subgrade material using sawdust, a readily and cheaply available material. With the addition of 10% fly ash to black cotton soil, the plastic limit reduces to 29. Expansive soil stabilization using plastic fiber waste. Stabilization of black cotton soil using microfine slag. The moisture content at this boundary is arbitrarily defined as the water content at which two halves of a soil cake will flow together, for a distance of. Swell behaviour of lime treated soil under sulphate. The soil was taken from 1 meter below the ground level. Liquid limit of samples are decreasing with the inclusion of common salt into the black soil. The apparatus required for the experiment should be clean. However increasing the lime content beyond 5% had a marginal effect in further reducing the plasticity index. Beside this, with the increase in optimum moisture content, an increase in the plasticity index, compression index, liquid limit were also observed. Footing, resting on such soils under goes consolidation settlements of high magnitude. Impact of marble powder on engineering properties of black.
The plasticity index variations for different soils are depicted in figs. The liquid and plastic limits are both dependent on the amount and type of clay in a soil, but the plasticity index is generally only. Bc soils absorb water heavily, swell, become soft, lose strength, easily compressible and has atendency to heave during wet condition. Changes in various soil properties such as liquid limit. It is an important index property of fine grained soil, especially for clayey soils. The failures of structure are mostly due to the failure of foundations. A study on engineering behavior of black cotton soil and its. Improvement of stabilization characteristics of black cotton soil using ternary blend for international organization of scientific research 33 page erdalcokca 2001. With the same intention, an attempt is made to modify engineering properties of black cotton soils from nagpur region, maharashtra, india by using rbi grade 81 and sodium silicate. Therefore, this study showed that coconut husk ash can be effectively used to improve lateritic soils with low cbr values. Atterbergs limit, compaction, california bearing ratio c. Atterberg limits, expansive soil, potassium chloride, swell, strength, compaction introduction expansive soils cover a considerable part of several countries around the globe.
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