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A Review on Utilization of Copper Slag and Silica Fume in Geotechnical Engineering
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1836 A Review on Utilization of Copper Slag and Silica Fume in Geotechnical Engineering K. Saranya1, K. Rohini2, A. Naveena3 1Assistant Professor, Department of Civil Engineering, Panimalar Engineering College, Chennai, India 2Student, Department of Civil Engineering, Panimalar Engineering College, Chennai, India 3 Student, Department of Civil Engineering, Panimalar Engineering College, Chennai, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract – The use of industrial wastes in various engineering projects has been trending in India. This is necessitated by the disposal problems associated with it. Copper slag and Silica fume are the most extensively used waste materials in the construction industry in recent times. Large quantities of these wastesareaccumulatedanddumped on costly land, causing wastageofgoodcultivableland. Mixing these wastes with existing soil type without completely removing and refilling with another soil type can be an alternative improvement technique to cement mixing and soil stabilization which are expensive. In thispaper, areviewof the previous research studies carried out by various researchers on effective usage of copper slag and silica fume is presented. Key Words: Copper Slag, Silica Fume, Soil Stabilization, Waste Utilization, Properties 1.INTRODUCTION Soil is a naturally occurring material used for the construction of all except the surface layers of pavements which generally involves concrete and asphalt. Copper slag and silica fume are the industrial wastes with commercial value which improve some engineeringcharacteristicsofthe soil such as strength, workability, texture and plasticity.The selection of type and determination of the percentage of additive to be used is dependent upon the classification and the degree of improvement in soil quality desired. Copper is one of the basic elements which is often usedinconstruction and electrical industries. It is a by-product of copper extraction by smelting. The other waste which ishighlyused in soil stabilization is silica fume which is a very reactive pozzolan which is by-product ofsiliconandferrosiliconalloy production. It is available in both wet or dry form. Soil containing silica fume can have very high strength and can be very durable. Silica fume and copper slag upon mixing with soil, can be used as an effective stabilizing agent for the improvement of problematic soils for use in sub-grades and sub-bases. 1.1 Copper Slag Copper slag(CS) isa wasteproductwhichcomesoutfrom the smelting of copper. The process of extracting copper slag varies according to the type of ore and the purity of the final product.Theunwantedmaterialsarephysicallyorchemically removed to get proper concentration of slag. Copper ore is mixed with powdered coke and sand which is heated at a high temperature in blast furnace. The furnace consists of steel plates lined inside with fire clay bricks. Hot air is introduced from the tuyers near the base of the furnace. The upper layer consists of slag and is removed while the lower layer is called matte which is a mixture of cuprous sulphide and unchanged ferrous sulphide [1]. Fig-1: Copper slag The production of one ton of copper generates approximately2-3tonnesofcopperslag.Utilizationofcopper slag in soil stabilization can solve a hazardous problem for environment. Copper slag is also widely accepted as embankment and structural fill material [2]. 1.2 Silica Fume Silica fume consists primarily of amorphous (non- crystalline) silicon dioxide. It is produced in electric furnace. The raw materials are quartz, coal and woodchips. The ash that results from this process is collected and sold as silica fume. It is commonly used as a mineral admixture in concrete. It is grey coloured powder which is similar to Portland cement or flyash. After environmental concerns necessitated the collection and landfilling of silica fume, itbecameeconomicallyjustified to use in various geotechnical applications. Flatwork containing silica fume concrete generally requires less finishing effort than conventional concrete. Silica fume concrete with low water content is resistant to penetration by chloride ions [3].
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1837 Fig-2: Silica fume 2. REVIEW OF RESULTS The effect of copper slag can be seen by replacing a partof the cement in concrete. The study conducted by CRRI, New Delhi showed that fine sand with copper slag upto 40% can be used as fine aggregate in pavement quality concrete as well as in dry lean concrete[4].Copperslagmixedwithflyash and clayey soil produces effective results in different proportions with suitability in embankment, sub-base and base of a road pavement [5]. Copper slag, when mixed with locally available soil in a proportion of 30% CS and 70% of soil, the plasticity index of the soil was reduced by 40% [6]. The physical properties of copper slag as obtainedfromBirla Copper Unit, Hindalco’sIndustriesLtd,Dahej,Gujarat,Indiais shown in the table-1. Table-1: Physical properties of Copper slag Property Value Specific gravity 3.51 Plasticity index Non-plastic Swelling index Non-swelling Hardness, Moh’s scale 6-7 Granular shape Angular, sharp edges Gravel (%) 1.00 Sand (%) 98.9 Silt + clay 0.05 Colour Black The siliceous and silica-aluminous substances available in copper slag are considered pozzolanic.Theyreactchemically with calcium hydroxide in the presence of water at normal temperature to form cementitious products in the form of a gel. Further addition of copper slag to lime or cement form calcium-alumina-silicates which have excellent binding characteristics [7]. A numberofstudieshavebeencarriedout in India as well as abroad to study the impact of copper slag and silica fume as partial replacements of cement and soil stabilizers and the results are encouraging. Mroueh et al carried out life-cycle analysis for the use of industrial waste slag in the construction of road which yielded effective conclusions forthe reuse ofwasteby-products[8].Improved soil with 35% Cu slag can be used as a subgrade material and the tensile and compressive characteristics can be improved substantially. TheCaliforniaBearingRatio(CBR)valuecanbe increased by more than 50% [9]. Copper slag isalso used as a replacement forsandinsand drains and sand piles. Mixing of copper slag with expansive soil has a good potential and economical [10]. Studies show that the behaviour of copperslag is similar to that of medium sands and can be used as construction material in place of sands, such as backfill of retaining walls and landfill for the construction of shallow foundations [11].The chemical composition of copper slag is shown in table-2. Table-2: Chemical composition of Copper Slag Property (% wt) Iron oxide 42-48 Silica 26-30 Aluminium Oxide 1-3 Magnesium Oxide 0.8-1.5 The addition of silica fume decreases the development of cracks on the surface of compacted clay samples which reduces the width of crack by75%. Thepermeabilityofsoilis increased with increase in silica fume content [12]. Silica fume canalso be used as a non-traditional stabilizerforblack cotton soil which is highly expansive in nature. The chemical composition of silica fume as collected from Shisher Export House, Raipur, Chattisgarh is presented in table-3. Table-3: Chemical Composition of Silica Fume Parameter Value Silica 89.9 Total Sulphur Content 0.58 Lime 7.85 Magnesia 4.03 Alumina - Iron Oxide - Increasingsilica fume upto 10% cementcontentsignificantly increased the unconfined compressive strength of the samples. Optimal percentage of nanosilica for the stabilization of cemented sand was 10%cementcontent.The optimum moisturecontent of cemented sand increased with the increase in nanosilica content. 3. CONCLUSIONS 1. Copper Slag has the potential to use as admixture to improve the properties of problematic soils. 2. Copper slag is recommended for sub grade, sub-base and bitumen mixes.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 04 Issue: 02 | Feb -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 1838 3. Utilizing and reusing the industrial waste products like copper slag and silica fume, the wastage of good cultivable land can be avoided. 4. Soil stabilized by silica fume and copper slag can be used for backfilling retaining walls and embankments. REFERENCES [1] Alpa I, Devecia H and u”ng”unbHS(2008),“Utilizationof flotation wastes of Copper Slag as Raw Material in Cement Production,” Turkey. [2] C. Lavanya, A. Sreerama Rao and N.Darga Kumar, “ A Review on Utilization of Copper Slag in Geotechnical Applications”, Kochi. [3] Chhaya Negi, R.K. Yadav and A.K. Singhai, “ Effect of Silica fume on Index Properties of Black Cotton Soil” (2013) [4] Vasant G.Havanagi, Sudhir Mathur, P.S. Prasad, C. Kamaraj, “Feasibility of Copper Slag- Fly ash- Soil mixas a Road Construction Material”, CRRI, Delhi. [5] Sh. Binod Kumar, “Utilization of Copper Slag as Fine Aggregate in Cement Concrete”, CRRI, Delhi. [6] Tandel Yogendra. K., “Utilization of Copper Slag as a subgrade”, Srilanka. [7] Chu.S.C and Kao.H.S. (1993),” A Study of Engineering Properties of a Clay Modified by Fly ash and Copper Slag”, ProceedingS, Flyash for soil improvement, American Society of Civil E ngineers, Geotechnical Special Edition, No.36, pp 89-99. [8] Mroueh,U.M., Laine-Ylijoki,J “Life-Cycle Impacts of the use of Industrial By-products in Road and Earth Construction”. [9] U.P. Nawagamuwa and H.K.P. Madushanka “Ground Improvement with Waste Copper Slag”. [10] Jegandan.S, Liska.M and Osman A, “Sustainable Binders for Soil Stabilisation” Proceedings of the ICE-Ground Improvement 163(1): pp.53-61. [11] “Use of waste materials and by-products in Road Construction” (1997) Organisation for Economic Cooperation and Development (OECD), pp.68-69. [12] Asskar Janalizadeh Choobbasti, Ali Vafaei and Saman Soleimani Kutanaei, “ Mechanical Properties of Sandy Soil Improved with Cement and Nano Silica”
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