As costs of waste disposal, transport and materials procurement continue to increase, the use of ground improvement techniques to prepare problematic soils for construction has become much more popular. Improving the unconfined compression strength of black cotton soil. Effect of hdpe plastic on the unconfined compressive strength of. Stabilization of black cotton soil with bagasse ash. Bagasse ash treated black cotton soil d use on cement kiln dust as an activator recorded great improvement in terms of strength gain bello, 2014. An experimental study on stabilization of black cotton. Determine unconfined compressive strength of cohesive soil.
Unconfined compressive strength of black cotton soil treated with various percentage of geopolymer. The method of soil reinforcement with the application of geosynthetics as the reinforcement is taken into. Mineralogy and physical properties of the test materials. Normally it has very high dry strength and very low wet strength. Experimental investigation on stabilization of black cotton. The changes in unconfined compressive strength of clayey soilsoptimum granite stone slurry dust composite with curing. Polypropylene fibers of 12 mm size with varying fibre content f 0%, 0. A series of compaction and unconfined compressive strength tests were conducted to. Thus sea shells powder can be used as a firm up agent. Literature view anil kumar singhai 1 et al, suggested that this study evaluates the effect of fly ash and rice husk ash to improve the performance of black cotton soil. Soil stabilization aims at increasing or maintaining the stability of soil mass and chemical alteration of soils to enhance their engineering properties.
For the waste added, the maximum strength obtained at 4. Introduction black cotton soil mostly found in africa and asia are considered as shrinks and swells soils. The admixture sea shell powder is added with an increment. This study aims to show the changes in the properties of clayey soils in the presence of granite stone slurry dust and lime sludge collected from granite block sawing mill and sugar industry, respectively. The black cotton soil obtained from the field was tested in the laboratory for unconfined compressive strength. Unconfined compression tests were conducted on a straincontrolled triaxial testing frame at a strain rate of 1%min without application of the cell pressure. The maximum load was converted to the unconfined compression strength of the sample. Effect of fly ash on the unconfined compressive strength of black. It is noted that only reactive fly ash can increase the unconfined compressive strength of black cotton soil. Where p axial load at failure, a corrected area, where is the initial area of the specimen, axial strain change in lengthoriginal length. The bond strength and friction at the interface may be the. The unconfined compressive strength of the black cotton soil increased upon addition of hdpe plastic waste.
Unconfined compressive strength of black cotton soil treated with various percentage of geopolymer for 7days. Pdf unconfined compressive strength of clayey soils. Sonawane and others published improving the unconfined compression strength of black cotton soil by. The ucs at each curing time has been normalized by the ucs at 0 day curing. It has been observed that the liquid limit decreased from 21%to 17% with the addition of quarry dust and granite waste from 0% to 20%. Engineers often face the problem with soft soil like clay soil or black cotton soil which does not possess sufficient strength to carry imposed loads. From fig 4, it can be shows that variation of unconfined compression strength with curing period for black cotton soil samples with different percentage of fly ash under unsoaked condition. This section contains description of the materials used in the investigation and the experiments carried out for the determination of the unconfined compressive strength of cement stabilized brown earth, black cotton soil and red earth under different water and cement contents and curing periods. Reliability estimate of unconfined compressive strength of black cotton soil stabilized with cement and quarry dust john engbonye sani, dayo oluwatoyin akanbi, godwin lazhi yisa and hadiza ibrahim hamidu 194 es. California bearing ratio, unconfined compressive strength and shear strength. The unconfined compression strength increases from 90.
Standard test method for unconfined compressive strength. Rice husk ash to improve the performance of black cotton soil. These tests are to be conducted at both nonstabilized and stabilized states by adding 2%, 4%, 6%, 8% and. Results presented show low strength characteristics. Reliability estimate of unconfined compressive strength of black. This study focuses on the use of calcium carbide residue ccr together with black cotton soil bcs to produce a stabilised material. To conduct the cbr test on the fiber combination giving best ucs unconfined compression strength to determine the suitability of the best fiber reinforcement. Stabilization of expansive soils by using corncob ash. Effect of compactive effort on strength characteristics of.
It has low shear strength, high swelling, shrinkage and compressibility characteristics. Evaluation of cohesive soil mixed with fly ash and. The unconfined strength of black cotton soil is 256kn m. Table 1 shows the geotechnical properties of this soil.
Unconfined compression strength of the soil q u shear strength of the soil q u 2 sensitivity q u for undisturbed sample q u for remoulded sample. The study involves the determination of unconfined compressive strength. Bearing ratio cbr test and unconfined compressive strength ucs test of the soil specimen were carried out in the laboratory. Study of geotechnical properties of black cotton soil contaminated. Comparative study of black cotton soil stabilization with rbi. Some of the properties which are improved are cbr value, shear strength, liquidity index, plasticity index, unconfined compressive strength ucs and bearing capacity, etc. From figure 3 to figure 5, graphs are plotted for different percentage dosage of geopolymer cured for 7, 15, 28 days for curing. The present study is to determine the behavior of black cotton soil reinforced with sisal fibre and lime in a random manner. The study focuses on effect of change of percentage fiber content and curing period on the engineering properties of soil 2. Study of geotechnical properties of black cotton soil. The unconfined compressive strength and cbr values increased addition of sisal fiber to mixture of black cotton soil and optimum dosage of ggbs.
Reliability estimate of unconfined compressive strength of black cotton soil stabilized with cement and quarry dust john engbonye sani, dayo oluwatoyin akanbi, godwin lazhi yisa and hadiza ibrahim hamidu 192 cotton soil as a subbase material for road pavement at all coefficient of variation cov. Optimum ccr dosage was obtained from atterberg limits, ph and unconfined compressive strength tests. From this study conducted with varying percentages of lime content it has been shown that at very low lime contents, sufficient strength can be achieved for a soil reactive fly ash mixture. Triaxial tests were then conducted on the treated samples to study the.
Effect of fly ash on the unconfined compressive strength. Reliability estimates of unconfined compressive strength values from laboratory results for specimens compacted at british standard light bslfor compacted quarry dust treated black cotton soil using cement for road sub base material was developed by incorporating data obtained from unconfined compressive strength ucs test gotten from the laboratory test to produce a. After performing all the necessary tests on the black cotton soil for unconfined compressive strength, the following observations were made. Increase in unconfined compressive strength after 4 weeks of curing was reported as 246 to 404%. The results obtained from the geotechnical tests conducted on black cotton soil treated with polymer stabilizer were analyzed. Mainly ucs and other properties of soil were calculated.
Strength properties of bioenzyme treated black cotton soil. This type of soil has excessive expansive and shrinkage characteristics which make it undesirable for use as subgrade in highway construction. Influence of fly ash, groundgranulated blast furnace slag and lime on unconfined compressive strength of black cotton soil. Strength and f o s performance of black cotton soil treated with. Effect of fly ash on the unconfined compressive strength of. Initially ucs of stabilized soils using both the stabilizers increased but with the increase in days of curing. Effect of sea shell powder on the unconfined compressive.
This paper was based on study of behavior of black cotton soil using bagasse ash and additives as stabilizing agent. Comparative study of black cotton soil stabilization with. Technical note unconfined strength of compacted black. An experimental study on stabilization of black cotton soil by using quarry dust and lime mixture. Black cotton soil is found in many states of india and is found to be problematic soil for construction. Unconfined compressive strength improved in black cotton soil after adding 20% quarry dust and granite waste. The test results reveals that the strength of bioenzyme treated black cotton soil is significantly increased and enzymes are effective for stabilization of expansive soils. Studies on the use of fish net fibers for stabilization of. Chanuhan rajiv and et al 2009 has studies the strength improvement of soil treated with lime and flyash mix for durability criteria. The study proved that the soil with plastic pieces have more strength than the plain soil. Pdf reliability estimate of unconfined compressive strength. The unconfined compressive strength and cbr values increased with curing period.
Effects of acids on geotechnical properties of black cotton soil. A study on strength properties of expansive soil treated. The geology and geotechnical properties of the black. On the other hand, an increase in pva content led to a reduction of free. Figure 2 load deflection curve of black cotton soil mixed with optimum percentage of fly ash and different. It was concluded that with the addition of admixtures, the unconfined compressive strength of the black cotton soil. Effect of curing time on strength development in black. The maximum unconfined compressive strength is obtained at 05% ba with 95% of black cotton soil is 0.
The main objective of this study was to evaluate the effect of fly ash in stabilization of black cotton soil. The study, conducted at constant percentage content of lime on the unconfined compressive strength of black cotton soil, with varying percentages of neyveli fly ash and vijayawada fly ash with and without curing, has shown that the effect of fly ash is mainly through pozzolanic reactivity and the silty character of fly ash. Experimental investigation the materials used for the tests include the black cotton soil and terrazyme bioenzyme. Experimental study on strength behaviour of kuttanad soil.
Plasticity, compaction, and unconfined compressive. Department of civil engineering, kaduna polytechnics, kaduna. The various tests such as liquid limit, plastic limit, differential free swell, unconfined compressive strength. The results show that the addition of ca to the soil. The study, conducted at constant percentage content of lime on the unconfined compressive strength of black cotton soil, with varying. The unconfined compressive strength of black cotton soil indicated significant increase in strength on addition of hdpe plastic waste.
Hdpe plastic, black cotton soil, unconfined compressive strength, shear test. For the present research work the black cotton soil was collected from harihara, davanagere district. In the unconfined compression test, we assume that no pore water is lost from the. Influence of lime sludge and sodium salts on the strength and. It is observed that there is a significant increase in unconfined compressive strength due to the inclusion of bamboo fiber in black cotton soil treated with optimum percentage flyash.
Structures sitting on expansive soils black cotton soil suffers from both structurally and nonstructurally damages due to the alternate expansion. Evaluation of engineering properties of black cotton soil. Stabilization of black cotton soil using alkali activated. Undrained shear strength of the ccrtreated soil was measured in this work. This is an expansive soil with a liquid limit of 80. Finally, the sample is oven dried to determine its water content. So it is planned to do shear strength test on al l kin d of sh ear strength testing instruments and the test results are compared. Need and scope of the experiment iitk indian institute. Unconfined compressive strength test on black cotton soil treated with optimum coir fiber content of 0. Materials and methods black cotton soil was collected from gulbarga, in karnataka state. Unconfined compressive test results for black cotton soil treated with optimum fiber content and varying percentage of cement content at zero days curing. Standard test method for unconfined compressive strength of. Effect of hdpe plastic on the unconfined compressive strength. Pdf unconfined compressive strength behavior of soil stabilized.
Effect of curing time on strength development in black cotton. Reliability estimate of unconfined compressive strength of. Minimum three samples should be tested, correlation can be made between unconfined strength and field spt value n. Prediction of strength development in black cotton soil. Need and scope of the experiment iitk indian institute of. Unconfined compressive strength of black cotton soil treated with 4 layers maximum of fish net fibers content have shown an increase in the strength by 356. D653 terminology relating to soil, rock, and contained fluids. Stabilization of black cotton soil using waste material. Sensitivity q u for undisturbed sample q u for remoulded sample general remarks. The strength improved with respect to the percentage of plastic present in the test specimen. Reliability of estimates of strength characteristic values from laboratory results for specimens compacted at the energy levels of british standard light bsl, west african standard was and british standard heavy bsh for compacted bagasse ash.
Keywordseggshell powder, gum arabic, california bearing ratio, compaction, unconfined compressive strength 1. The rapid industrialization has resulted in generation of large quantities of wastes. The unconfined compressive strength of the black cotton soil increases by adding the soil with sea shells powder. Black cotton soil which is a type of expansive soil, has the property of swelling excessively when wet and shrinks highly when exposed to dry conditions. The highest result was obtained for mixture of black cotton soil and optimum dosage of ggbs with 0. Black cotton soil using bioenzyme and bagasse ash civil. The various tests such as liquid limit, plastic limit, differential free swell, unconfined compressive strength, and california bearing ratio were performed on each sample. It is one of admixture out of remaining admixture like stone dust, fly ash, rice husk, polymers, portland cement, lime and ionic stabilizers. Influence of fly ash, groundgranulated blast furnace slag. India consists of 3040% of black cotton soil of its total area, black cotton soil is widely spread in north karnataka, maharashtra, gujarat and madhya pradesh which has high clay content, low. Black cotton soil with 6% cement gives optimun value with respect to unconfined compressive strength. Effect of random inclusion of sisal fibre on strength.
Undrained yielding of black cotton soil treated with. The undrained shear strength s of the soil is equal. Active standard astm d2166 d2166m developed by subcommittee. Mineralogical analysis shows the soils to be predominantly kaolinite and mont morillonite. Aishwaryalakshmi assistant professor, department of civil engineering, saveetha engineering college, thanadalam, chennai, tamil nadu vishweshwaran m assistant professor, school of civil engineering. The ucs was obtained for 17 different soils each of them was prepared. Unconfined compressive strength behavior of soil stabilized by various fiber.
Increase in ucs by adding hdpe occured with increase in maximum dry unit weight at lesser omc. Utilisation of industrial waste products with black cotton soil bcs in the improvement of its engineering properties has gained attention to the sustainability of the natural resources and cost efficiency. Clayey soils in this study refer to black cotton soil and red earth. Oct 11, 2016 black cotton soil is found in many states of india and is found to be problematic soil for construction. Plasticity, compaction, and unconfined compressive strength qu 40 fig.
The unconfined compressive strength q u is the load per unit area at which the cylindrical specimen of a cohesive soil falls in compression. Fsi indicates potential of expansiveness of soil which is not desirable for soil treated with sodium silicate and pose limitation of sodium silicate to be used as stabilizer for black cotton soil. Effect of hdpe plastic on the unconfined compressive. Cbr values of black cotton soil treated with 4 layers of fish net fibers have increased the value by 8. D2216 test methods for laboratory determination of water moisture content of soil and. Results showed that the strength of the compacted soil samples increased with curing time and that the maximum unconfined compressive strength was reached for the soil samples with 5% gypsum. Soil and foundation engineering ced 43 designator of legally binding document. Reliability estimate of unconfined compressive strength of black cotton soil stabilized with bagasse ash and cement kiln dust hamidu, h. The study focuses on effect of change of percentage fiber content on the properties of soil. The california bearing ratio value from the cbr test, the obtained results are shown in. An astm designation number identifies a unique version of an astm standard. The maximum load per unit area is defined as the unconfined compressive strength, qu. Prediction of unconfined compressive strength of soft grounds.
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