The International Journal of Engineering and Science (IJES) || Volume || 7 || Issue || 8 Ver. III|| Pages || PP 33-38 || 2018 || ISSN (e): 2319 – 1813 ISSN (p): 23-19 – 1805 DOI:10.9790/1813-0708033338 www.theijes.com Page 33 Effect of Steel Mill Scale Dust and Bamboo Fibres on the Strength Characteristics of Expansive Soil Gorapalli N Satyanarayana, S.Durga Prasad, Dr. D S V Prasad, Dr. G V R Prasada Raju M.Tech Student, Department of Civil Engineering, JNTUK, Kakinada, AP, India Research Scholar, Department of Civil Engineering, JNTUK, Kakinada, AP, India Department of Civil Engineering, BVC Engineering College, Odalarevu, AP, India Department of Civil Engineering, JNTUK, Kakinada, AP, India Corresponding Author: Gorapalli N Satyanarayana --------------------------------------------------------ABSTRACT--------------------------------------------------------------- In highway construction where unsuitable soil is present, it requires to improve its engineering properties. Due to fund restrictions we have to use economical material. As steel industry has a waste with good engineering properties, we can use steel waste with soil. Bamboo is recognized as a potential natural reinforcing material for improvement and stabilization of soil. Construction of foundation for structures on black cotton soil is highly risky on geo-technical grounds because such soil is susceptible to differential settlements, poor shear strength and high compressibility. The properties of the black cotton soils can be altered in many ways viz. mechanical, thermal and chemical means. Therefore, soil stabilization techniques are necessary to ensure the good stability of soil so that it can successfully sustain the load of the Superstructure especially in case of soil which is highly active; also it saves a lot of time. In the present work, an attempt has been made to study the geotechnical characteristics of black cotton soil mixing with different percentages of Mill scale dust and Bamboo fibres with a view to determine the optimum percentage and its effect on strength characteristics. Test results shows that stabilizing clayey soils with Mill scale dust and Bamboo fibres enhance the strength. KEYWORDS - Bamboo Fibres, Compaction, CBR, Expansive Soil, Mill Scale Dust. ------------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 08-08-2018 Date of acceptance: 23-08-2018 ------------------------------------------------------------------------------------------------------------------------------------------- I. INTRODUCTION Stability of any structure depends on strength properties of underground soil on which it is constructed.Excessive use of materials, leads to industrialization, which has an adverse impact on the environment. From industries, large amount of chemicals or other suspended particles as a waste are produced, which are mostly dumped that acquires large space leading to deterioration of soil properties. So, we should use these waste for some constructive or useful purposes. As steel industry releases waste with some good engineering properties so, we can use this type of waste with soil which has low strength and does not have good engineering properties. Various techniques are available like soil stabilization, providing reinforcement etc. to improve load bearing capacity of soil. Black cotton soil is one of the major soil deposits of India. Black Cotton soils absorb water heavily, swell, become soft and lose strength. These soils are easily compressible when wet and possesses a tendency to heave during wet condition. Soil stabilization is one of the modification techniques used to improve the geotechnical properties of soil and has become the major practice in construction engineering which enables the effective utilization of industrial wastes as a stabilizer. Bamboo is recognized as a potential natural reinforcing material for improvement and stabilization of soil. Effect of bamboo fibres on local soil and based on the current investigation when bamboo fiber quantity is increases, un-soaked and soaked California Bearing Ratio (CBR) value of soil are considerable increase and this increase is occurred up to 1.2% of bamboo fiber dosage. Usage of more than 1.2% of bamboo fiber dosage is not feasible and optimal proportion of bamboo fiber is found 1.2% by waterless weight of ordinary soil. The unsoaked and soaked CBR test value of soil increases with the increase in bamboo fiber length and diameter [1]. Stabilization of expansive soil treated with different percentages of Mill Scale and concludes that the coarse fraction decreases OMC, increases MDD and CBR, but effect is insignificant for course fraction less than 30% to 40% by weight of soil. Unconfined compressive strength decreases with coarse fraction but effect being insignificant for coarse fraction more than 30%to 40% by weight of soil. With increase in percentage of Mill scale the shear strength of the soil increased from 0.12 to 0.2974, obtained at 21% of mill scale added to the dry weight of soil. The Percentage increase is 147.83%. With increase in percentages of Mill scale the Unsoaked CBR value is increased from 1.66 to 10.29