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    Int. J. Struct. & Civil Engg. Res. 2015 Tushar R More et al., 2015

    STRENGTH APPRAISAL OF CONCRETECONTAINING WASTE TYRE CRUMB RUBBER

    Tushar R More1*, Pradip D Jadhao1 and S M Dumne2

    1 Department of Civil Engineering, K K Wagh Institute of Engineering Education & Research Nashik 422 203, India.2 Department of Applied Mechanics, Government Polytechnic Aurangabad, 433 005, India.

    *Corresponding author: Tushar R More trm_more@yahoo.com

    ISSN 2319 6009 www.ijscer.comVol. 4, No. 1, November 2015

    2015 IJSCER. All Rights Reserved

    Int. J. Struct. & Civil Engg. Res. 2015

    Research Paper

    INTRODUCTIONCement and aggregate, which are the mostimportant constituents used in concreteproduction, are the vital materials needed forthe construction industry. This inevitably led toa continuous and increasing demand of

    Waste-Tire rubber is one of the significant environmental problems worldwide because ofincrease in auto mobile production huge amounts of waste tire need to be dispose. Due to rapiddepletion of available sites for waste disposal, many countries banned the disposal of waste tirerubber in landfills. Hence, efforts have been taken to identify the potential application of wastetyre crumb rubber in civil engineering projects. Crumb rubber is a waste material that is ideal foruse in concrete applications. This has an additional advantage of saving in natural aggregatesused in production of concrete which are becoming increasingly scarce. In this essence, ourpresent study aims to study the use of waste tyre rubber as partial replacement of fine aggregateto produce rubberize concrete in M25 grade of mix. Different partial replacements of crumbrubber (0, 3, 6, 9 and 12%) by volume of fine aggregates are cast and tested for flexural strengthand split tensile strength. The results show that there is a reduction in all type of strength forcrumb rubber mixture, but crumb rubber content concrete becomes more lean due to increasein partial replacement of crumb rubber fine aggregates from 0% to 12% therefore such type ofconcrete of is useful in making light weight concrete. The experiments were carried out todetermine flexural and split tensile strength of waste tyre crumb rubber concrete beams andcylinders on 7 and 28 days. The results of using waste tyre rubber aggregates in concrete ascompared to normal concrete are analyzed. It is recommended to use the rubberized concretefor nonstructural applications.

    Keywords: Fine aggregates, Crumb rubber aggregates, Silica fume, Normal concrete,Rubberized concrete, Workability, Flexural strength, Split tensile strength

    natural materials used for their production.Parallel to the need for utilization of naturalresources emerges a growing concern forprotecting the environment and a need topreserve natural resources, such asaggregate, by using alternative materials that

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    Int. J. Struct. & Civil Engg. Res. 2015 Tushar R More et al., 2015

    are either recycled or discarded as a waste.The discharge of waste tyres are expensiveand continuously decreasing numbers oflandfills generates significant pressure to thelocal authorities identifying the potentialapplication for this waste products. One of thelargest potential routes is in construction, butusage of waste tyres in civil engineering iscurrently very low. The sustainablemanagement of the aforesaid waste tyrerubber is a huge task to the industries andpublic sectors because of the disposal ofwaste tyre to landfill is legally banned in all thecountries due to the environmental impact.Several studies have been carried out to reusescrap tyres in a variety of rubber products,incineration for production of electricity or asa fuel for cement kilns as well as in asphaltconcrete (Mohammad Reza shorbi andMohammad Karbalai, 2011). Investigationsshow that used tyres are composed ofmaterials which do not decompose underenvironmental conditions and cause seriouscontaminations. Burning is a choice for theirdecomposition; however the gases exhaustedfrom the tyre burning results in harmfulpollutions. Based on examinations, anotherway is using the tyres in concrete. This resultsin the improvement of such mechanical anddynamical properties as energy adsorption,ductility, and resistance to cracking. However,this may cause a decrease in compressivestrength of the concrete which wi ll becompensated by adding Nano-silica to rubbercontaining concretes (Parveen, 2013). Partialreplacement of rubber tyre aggregates inconcrete has the additional advantage ofsaving in natural aggregates used in theproduction of concrete which are becoming

    increasingly scarce. This paper investigateda wide range of physical and mechanicalproperties of concrete containing recycled tyreaggregates, to assess its suitability as aconstruction material (Ameer, 2011). Crumbrubber mixture is more workable compare tonormal concrete and also it is useful in makinglight weight concrete (El-Gammal, 2010).Using rubber waste in concrete, less concretemodulus of elasticity is obtained thereforemodulus of elasticity is related to concretecompressive strength and the elasticproperties of aggregates have substantialeffect on the modulus of elasticity of concrete.The larger amount of rubber additives isadded to concrete, the less modulus ofelasticity is obtained. The objective of the workwas to analyze the effect of fine compositionof the elastic aggregate made from rubberwaste on the elastic properties of concreteunder the static and dynamic load (Kamil,2005). It is recommended to use therubberized concrete for nonstructuralapplications.

    In this paper, general objectives of study isto evaluate the fresh and hardened propertiesof concrete produced by replacing part ofnatural fine aggregates with an aggregatesproduced from locally available recycled tyrerubber. The specific objectives of this study are(i) observation of some physical properties ofconcrete mix contained from waste tyreaggregates; (ii) flexural and split tensilestrength of concrete mix using differentpercentage replacement; (iii) interpretationand discussion of test results obtained fromvarious mixes in the laboratory; and (iv)comparing test results obtained from crumbrubber concrete with the normal concrete.

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    Int. J. Struct. & Civil Engg. Res. 2015 Tushar R More et al., 2015

    CONCRETE INGREDIENTSAND PROPERTIESFor this experimental work material used todevelop the concrete mixtures were cement,fine aggregate, coarse aggregate, water, andcrumb tyre rubber. The cement used wasOrdinary Portland Cement of 53 as per IS12269: 1987. The fine and coarse aggregatesamples for conducting the experiments areused from the store room of K K Wagh Instituteof Engineering Education and ResearchCenter, Nashik. Crumb rubber that replacesfor sand as shown in Figure 1, is manufacturedby special mills in which big rubbers changeinto smaller torn particles. To investigate itsproperties and suitability for the intendedapplication, various tests are performed as (1)sieve analysis and fineness modulus; (2)specific gravity; (3) water absorption; (4) siltcontent. The test results obtained for fineaggregates are, fineness modulus = 2.31,specific gravity = 2.75, water absorption =0.69% and silt content = 0.89% whereas forcoarse aggregates, fineness modulus = 7.51,specific gravity = 2.8, water absorption = 0.39%and silt content = 0.25%.

    The rubber aggregates used in the presentinvestigation were made by mechanically cuttingthe tire in to the required sizes. It was verylaborious, time consuming and was not easy tohandle at the initial stages. However, all thiscomplications can be easily sorted out if a largescale production is devised and proper cuttingtools and machineries are made for this particularusage. Source of rubber aggregates is thediscarded tyre that is, trucks tyre which iscollected from the local market and rubber tyrefine aggregates are prepared from tyre remoldingshop in Nashik as shown in Figure 1.

    The rubber aggregates used in present studyare prepared mechanically by cutting the tyresto maximum nominal size equal to 4.75 mm asshown in Figure 1 and kept for air drying aftercleaning with potable water. The specific gravityis obtained from test equal to 1.10.

    EXPERIMENTAL SETUPIn this work various tests are performed byconducting the experiments in the materialtesting laboratory of K K Wagh Institute ofEngineering Education and Research, Nashik.

    Figure 1: Waste Tyres and Crumb Rubber Aggregates Used in Concrete Mix

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    Int. J. Struct. & Civil Engg. Res. 2015 Tushar R More et al., 2015

    In this study, four different concrete mixes ofsame concrete grade are prepared withconstant 10% silica fume replaced to cementand by partial replacement of fine aggregatesof 3, 6, 9 and 12% with rubber aggregates byan equal volume of rubber aggregates to formrubberized concrete. In addition, a normalconcrete of same grade is also prepared withno replacement of fine aggregates and silicafume. Mixing was done in a small rotary drummixer as shown in Figure 2. Coarseaggregate, sand, rubber aggregate, cement,and water were added to the mixerrespectively. After the addition of each material,the mixer continues to mix until the mixturebecame homogenous. Oiled steel molds ofbeam dimensions 100 100 500 mm, andfor cylindrical specimen having diameter 150mm and length 300 mm shown in Figure 2,were filled in approximately three equal layersand compacted manually. After 24 h of casting,specimens were cured by soaking in to wateruntil the age of testing. In experimentalassessment, tests are performed are,compaction factor, and flexural strength and

    split tensile strength at 7th and 28th days forvarious concrete mixes.

    STEEL MOULDS FORCONCRETE CASTINGTest Results and Discussion

    This section describes the results of tests carriedout to investigate t

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