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PARTIAL REPLACEMENT OF FINE AGGREGATE WITH CRUMB RUBBER

Mr. Sanskar Tiwari1, Mr. Keshav Mishra2

1Assistant Professor, Department of Civil Engineering, Rameshwaram Institute of Technology and Management, Lucknow, India

2Assistant Professor, Department of Civil Engineering, Rameshwaram Institute of Technology and Management, Lucknow, India

Abstract - Therapiddepletionofnaturalriversandandthe environmental burden caused by discarded tires have encouraged the exploration of sustainable alternatives in concrete production. This study investigates the feasibility of partially replacing fine aggregate with crumb rubber in conventional concrete and evaluates its effects on fresh and hardened properties. Concrete mixes were prepared with crumb rubber replacing natural fine aggregate at varying proportions, typically ranging from 0% to 20% by volume. Standard tests were conducted to assess workability, density, compressive strength, and flexural performance at different curing ages. Experimental observations indicate that the incorporation of crumb rubber reduces the unit weight of concrete,producingalightercompositematerial.Workability decreasesgraduallywithincreasingrubbercontentduetothe irregular particle shape and hydrophobic nature of crumb rubber. Mechanical strength shows a reduction compared to control concrete, primarily attributed to weaker interfacial bonding between rubber particles and the cement matrix. However, mixes with low replacement levels demonstrate acceptable strength characteristics for non-structural and secondaryapplications.Thefindingshighlightthepotentialof crumb rubber concrete as an eco-friendly material that contributes to waste tire management and sustainable construction practices. The study concludes that controlled replacement levels can balance performance and environmental benefits, encouraging further research on surface treatment methods and admixture optimization to enhance bonding and durability.

Key Words: Crumb rubber; fine aggregate replacement; sustainable concrete; compressive strength; workability; lightweight concrete

1. INTRODUCTION

1.1 Background

1.1.1 Importance

of Sustainable Concrete Materials

The concrete is a construction material that is of high compressive strength, available, and affordable, which makesitthemostcommonlyusedconstructionmaterialin the world. Nevertheless, the traditional manufacturing procedure of concrete is based on a high level of consumptionofnaturalmaterials,includingsandandgravel, whichleadstotheworseningoftheenvironment,exhaustion ofnon-renewableresources,andahigheramountofcarbon

emissions throughout the production process and the outputs.Recentstudieshavefocusedonsustainableconcrete materialsduetotheaimofminimizingtheadverseeffectson the environment without undermining the acceptable engineering characteristics. Sustainability in concrete technology is aimed at not only recycling industrial and urbanwastesbutalsosubstitutingthetraditionalmaterials withmaterialsthatareenvironmentallyfriendlyandwould decreasethecarbon footprintof theconstruction practice (Dasetal.,2025;Moolchandanietal.,2024).

1.2Challenges in TraditionalConcrete Components

1.2.1

Problems with Natural Sand Scarcity

Natural river sand, widely used as a fine aggregate in concrete,isfacingincreasingscarcityinmanypartsofthe worldduetounregulatedminingandgrowingconstruction demand. Excessive sand extraction leads to riverbank erosion,lossofaquatichabitats,reducedgroundwaterlevels, and ecological imbalance. These environmental concerns have motivated researchers and engineers to explore alternativematerialstopreservenaturalsandresourcesand ensuresustainableconcreteproduction(Moolchandanietal., 2024).

1.3 Alternative Materials for Concrete

1.3.1

Crumb Rubber: Source and Properties

Crumbrubberisproducedbymechanicallygrindingwaste tiresintosmallparticlestypicallylessthan5mminsize.Itis characterized by a lower specific gravity, hydrophobic surfaceproperties,andatendencytotrapairwhenmixed into cementitious materials, which differentiates it from naturalfineaggregates.Wastetiredisposalisasignificant environmentalissueduetothenon-biodegradablenatureof rubberandthelargevolumegeneratedannually.Utilizing crumb rubber in concrete offers a way to repurpose this waste into construction materials, thus reducing landfill burdenwhileconservingnaturalresources(Lietal.,2022; Moolchandanietal.,2024).

1.4 Research Gap

1.4.1

Performance of Concrete with Crumb Rubber

Although many studies have investigated crumb rubber concrete, variationsinmaterial behavior, suchasreduced

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workabilityanddecreasedmechanicalstrength,stillpresent challenges.Thehydrophobicnatureofrubberparticlesand weak bonding withthecement matrixoftenlead tolower compressiveandtensilestrengthcomparedtoconventional concrete.Inaddition,mostpublishedworksfocusonlimited replacement percentages and specific test conditions. Therefore, further research is needed to comprehensively evaluate the effects of different crumb rubber contents, particlesizes,andpossiblesurfacetreatmentsonconcrete performanceacrossfreshandhardenedstates.Suchstudies willhelpclarifytheoptimalapplicationsandperformance limitations of crumb rubber concrete for sustainable constructionsolutions(Lietal.,2022).

2. LITERATURE REVIEW

2.1

Overview of Previous Research

2.1.1

Studies on Material Used and Tests Conducted

Much literature has been done on the replacement of fine aggregate by crumb rubber in concrete partially and the issueunderregardisworkability,mechanicalperformance and durability properties of concrete. A majority of the research cases have consistently indicated that incorporation of crumb rubber influences fresh and hardenedconcrete,whichtendstodecreasestrengthbuthas no effect on other characteristics like ductility or impact resistance.

Asanexample,Mohammedetal.(2017)examinedconcrete mixtures with 5, 10 and 15 crumb rubber used instead of fine aggregates and conducted slump and compressive strengthtests.Theyfoundthattheworkabilitystartedrising with low replacement percentages but generally declined with higher replacement percentages of more rubber, whereascompressivestrengthwasinferiortoconventional concrete over all replacement percentages. This has been credited to the light specific gravity and low bonding propertiesofrubberparticlesthatformvoidsandlowerthe densityofconcreteadverselyimpactingthestrength.

Onthesamenote,testswerecarriedoutonconcretewith5, 7 and 9 percent crumb rubber substitute with slump, compressivestrengthanddurabilitymonitoring(Dhumalet al.2025).Theirresultssupportedthefactthatthehigherthe crumb rubber, the lower the compressive strength as the rubberandcementpasteinteractedwithlessstrengthbut that there were mixes that had good flexibilities and resistance to environmental stresses such as freeze thaw processsuchasmoderatequantitiesofcrumbrubber.

Theliteraturereviewisalsocomprehensiveandsummarizes the trends of numerous studies, highlighting the negative shift in mechanical properties at increased crumb rubber content.Amongotherresearchers,Azunnaetal.(ascitedby others)foundthatcompressivestrengthdecreasedsharply with rubber percentage after about 10 percent mainly

because of increased void content, reduced strength of interfacialtransitionzones,andreducedstiffnessthanthat ofnaturalaggregates.Nonetheless,rubberconcretetended tohaveahighlevelofductilityandenergyabsorption.

Otherstudieshave notedsurfacetreatmentoraddition of othermaterials(e.g.silica fume or flyash) canreduce the bad effects of crumb rubber partially by increasing interfacialbondingandinsomecasesincreasingdurability properties, but compressive strength is usually still lower thanplainconcrete.

3. MATERIALS AND METHODS

3.1 Materials

3.1.1

Cement — Grade & Properties

Inthisstudy,PortlandPozzolanaCement(PPC)orOrdinary Portland Cement (OPC) is used as the primary binder in concrete. OPC conforming to relevant standards (e.g., IS 8112 or ASTM C150) typically has a grade designation of 42.5N or 43, indicating a 28-day compressive strength of approximately 42.5–43 MPa when tested as per standard procedures.Chemically,cementconsistsprimarilyofcalcium silicates (C₃S and C₂S), which contribute to strength development,alongwithgypsumtocontrolsettingtime.Its use ensures hydration reactions proceed effectively with water to form a cohesive matrix that binds aggregates together(basedontypicalconcretematerialstandardsand researchpractice).

3.1.2 Coarse Aggregate Size & Source

Coarseaggregateinconcreteservestoprovidebulk,reduce shrinkage, and improve stability and strength. Commonly sourced from crushed stone or quarry rock, coarse aggregatesusedinresearchconformtogradingstandards withamaximumnominalsizeof20mmandacontinuous grading to ensure good particle packing. Their specific gravitytypicallyrangesaround2.50–2.70,andtheyhavelow absorption, contributing to concrete’s mechanical performancebyresistingdeformationunderloadconditions. Inspecificresearchcontexts,locallyavailablelimestoneor granite aggregates with sizes between 5 mm and 20 mm havebeenemployedconformingtoIS383/ASTMgradation standardstoensureconsistencyinmixquality.

3.1.3 Fine Aggregate (Natural Sand)

Fine aggregate, often natural river sand or manufactured sand (M-sand), passes through a 4.75 mm sieve and generallyhasafinenessmodulusbetween2.6and3.0.This rangeensuresanadequatebalancebetweenworkabilityand strength.Fineaggregatesfillvoidsbetweencoarseparticles, improvecohesivenessofthemixture,andfacilitateadense packing of materials. According to standard aggregate specifications, fine aggregates should be clean, free of

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deleteriousparticles,andappropriatelygradedtoenhance workabilitywithoutexcessivewaterdemand.

3.1.4 Crumb Rubber Size & Treatment

Crumbrubberusedinthisresearchisrecycledfromend-oflife vehicle tires and processed into granulated particles suitable for use as a fine aggregate replacement. Typical crumbrubberparticlesizesforconcreterangefrom0.5mm to 4.75 mm, matching the grading of fine aggregate and complyingwithASTMC33standards.Thespecificgravityof crumb rubber is significantly lower (approximately 1.08–1.10) compared to natural aggregates, and its surface characteristicsleadtoreducedwaterabsorptionandweaker bondingwithcementpaste.

3.1.5 Water

Clean,potablewaterisusedformixingandcuringconcrete. Watershouldbefreeofimpuritiesthatinfluencesettingand hydration, with a typical pH between 6 and 8. The watercementratio(w/c)ismaintainedatalevelappropriatefor thetargetedconcretegrade(oftenbetween0.40and0.50)to balance workability and strength development. Water chemicallyreactswithcementparticlestoinitiatehydration, whichformshydratedproductsresponsibleforstrengthgain anddurability.

3.2. Mix Proportions

3.2.1

Concrete Mix Design and Replacement Levels

Theconcretemixdesign withinthisstudyis basedonthe principles of IS 10262:2019 and IS 456:2000 regarding ordinary reinforced concrete but change it in order to considertheusageofcrumbrubberasapartialsubstituteof afineaggregate.NominalconcretegradeofM30isuseddue toits broaduse in general construction. Theconventional materials are used in the control mix (M0) with no 0% naturalfineaggregatereplacements.

Tomeasuretheeffectofcrumbrubber(CR)ontheconcrete propertiesina systematicway,fourothermixes(M1-M4) are prepared in which natural fine aggregate has been substitutedbycrumbrubberinvolumeas5,10,15and20 percent respectively. The percentages of replacement are chosenaccordingtothepaststudiesthathaveshownthat more than 20 percent replacement can have very strong compressive strength with other lower proportions preserving the more acceptable mechanical properties (Moolchandanietal.,2024;Lietal.,2022).Theproportionof mixesisadjustedtokeepwater/cementratio(w/c)at0.45 tobalancetheworkabilitywithstrengthassuggestedinIS 456:2000oftheconcreteasdurableconcrete.Wheretheuse ofsuperplasticizersisrequired,itisdoneincompliancewith IS9103:1999.

Table-1: mix identification and replacement percentages

Mixadjustmentssuchasslightincreasesincementcontent oruseofadmixturesareapplieduniformlyacrossCRmixes to offset reduced workability and to help achieve target strengthparametersasperIndiancodeprovisions.

3.3. Tests Conducted

3.3.1 Workability and Density

Workability of all concrete mixes is evaluated using the Slump Test in accordance with IS 1199:1959, providing essential insight into the flow and ease of placement. Workability is expected to reduce with increasing crumb rubbercontentduetothelowsurfaceenergyandirregular shape of rubber particles, requiring energy to maintain flowability.

Unit weight (density) measurements are carried out following guidelines in IS 2386 (Part 3):1963, which help determine the mass-per-unit volume of fresh concrete. Density valuesare useful to assesstheinfluenceofcrumb rubber’slowerspecificgravityonoverallmixcompactness, typicallyresultinginreduceddensitycomparedtocontrol concrete.

3.3.2 Mechanical Strength Tests

The primary mechanical property investigated is compressivestrength,testedat7,28,and56days usinga compression testing machine as specified in IS 516:1959. Standardcubes(150mm×150mm×150mm)arecastand cured in water for defined periods before testing. Compressive strength trends with age and replacement percentageprovidequantifiableinsightintothestructural capacityofcrumbrubberconcreterelativetoconventional mixes.

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Flexuralstrengthisevaluatedusingstandardprisms(100 mm × 100 mm × 500 mm) following IS 516:1959, determining the bending capacity which is crucial for applicationswhereconcreteslabsorbeamsaresubjectedto flexuralstresses.

3.3.3

Durability Assessment

Durability is preliminarily assessed through water absorptiontestsinaccordancewithASTMC642(commonly referencedfordurabilityperformance),whichmeasurethe volume of water absorbed by hardened concrete. Higher absorption generally indicates increased porosity and potential for reduced long-term durability, particularly relevant where crumb rubber particles increase void content.

4. RESULTS

4.1 Workability Results

4.1.1 Slump Test Performance (IS 1199:1959)

Workabilityoffreshconcretewasevaluatedusingtheslump conetestinaccordancewithIS 1199:1959.Themeasured slumpvaluesforallmixesarepresentedinTable2.

Table-2: Slump Test Performance

Graph-1: Slump Test Performance

Thecontrolmix(M0)exhibitedaslumpof70mm,indicating medium workability suitable for reinforced concrete construction as per IS 456:2000 recommendations. With progressivereplacementoffineaggregatebycrumbrubber

(CR), slump values decreased gradually to 50 mm at 20% replacement(M4).

Thereductioninworkabilityisprimarilyattributedtothe hydrophobic surface texture, irregular shape, and lower specific gravity of crumb rubber particles, which reduce cohesionandinternallubricationwithintheconcretematrix. Similardecreasingtrends in slumpwithincreasingcrumb rubbercontenthavebeenreportedinrubberizedconcrete research (Li et al., 2022). However, despite reduction, all mixes remained within workable limits for manual compaction.

4.2 Density

4.2.1 Unit Weight of Concrete (IS 2386 Part III:1963)

The density of hardened concrete was determined in accordance with IS 2386 (Part III):1963. Results are summarizedinTable3.

Table-3: Unit Weight of Concrete

Graph-2: Unit Weight of Concrete

The control mix recorded a density of 2400 kg/m³, which falls within the typical range for normal-weight concrete (2200–2500kg/m³).Incorporationofcrumbrubberresulted inasystematicreductionindensity,reaching2200kg/m³at 20%replacement.

This reduction is expected due to the significantly lower specific gravity of crumb rubber (~1.10) compared to naturalsand(~2.6).Thedecreasingdensityindicatesthat

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crumb rubber concrete behaves as a semi-lightweight materialathigherreplacementlevels.Previousstudieshave similarlyobserveddensityreductionsrangingbetween5–15%dependingonreplacementpercentage(Moolchandani etal.,2024).

4.3 Compressive Strength

4.3.1 Compressive Strength Development (IS 516:1959)

Compressive strength tests were conducted on 150 mm concretecubesat7,28,and56daysinaccordancewithIS 516:1959.TheresultsareshowninTable4.

Table-4: Compressive Strength

At28days,thecontrolmix(M0)achieved35MPa,satisfying the target mean strength requirement for M30 grade concrete as per IS 456:2000. Strength reduction was observed with increasing crumb rubber content. At 5% replacement(M1),thereductionwasapproximately8.6%, while at 20% replacement (M4), the reduction reached nearly37%relativetothecontrolmix.

The decrease in compressive strength is primarily due to:

 Weakinterfacialtransitionzone(ITZ)betweenrubber particlesandcementpaste

 Increasedentrappedaircontent

 Lower stiffness and elastic modulus of rubber comparedtomineralaggregates

However,mixesupto10%replacement(M2)stillachieved 29MPaat28days,whichmaybeacceptableforcertainnonstructuralorsecondarystructuralapplications.Comparable strength reduction trends have been widely reported in crumbrubberconcreteresearch(Lietal.,2022).

4.4 Flexural Strength

4.4.1 Flexural Behaviour (IS 516:1959)

Flexuralstrengthwasdeterminedusingprismspecimensin accordancewithIS516:1959.Theresultsarepresentedin Table5.

Table-5: Flexural Behaviour

Flexural strength decreased progressively with crumb rubberinclusion.At20%replacement,strengthreducedby approximately 27% compared to control. The reduction mirrors compressive strength behavior due to weaker bondingandreducedstiffness.

However, crumb rubber concrete often exhibits improved ductilityandcrackresistance,asrubberparticleshelpbridge microcracksanddelaysuddenbrittlefailure(Moolchandani et al., 2024). This characteristic may be advantageous in applicationssubjectedtovibrationorimpactloading.

5. DISCUSSION

5.1 Interpretation of Fresh Concrete Behaviour

5.1.1 Influence of Crumb Rubber on Workability

The experimental results clearly indicate a progressive reduction in workability as crumb rubber (CR) content increases. This behavior is consistent with the physical characteristics of rubber particles, which possess an irregular geometry and hydrophobic surface that limits properwettingbycementpaste.Unlikenaturalsand,crumb rubber does not absorb water or contribute to internal lubrication, resulting in reduced flowability and higher resistancetocompaction.Fromapracticalstandpoint,the observedslumpvaluesremainwithinacceptablelimitsfor medium-workability concrete as per Indian practice, but additional plasticizer dosage may be required at higher replacementlevelstomaintainplacementefficiency.Similar observations have been reported in rubberized concrete research, where slump reductions of 10–30% were associated with increasing rubber content due to particle morphologyandsurfacechemistry(Lietal.,2022).

5.2 Hardened Concrete Characteristics

5.2.1

Density Reduction and Lightweight Behaviour

The decrease in density with increasing crumb rubber replacement reflects the intrinsic material properties of rubber,whosespecificgravityissignificantlylowerthanthat

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of mineral aggregates. The gradual drop in unit weight indicatesthatcrumbrubberconcretetransitionstowarda semi-lightweight material at higher replacement percentages.Thisreductioncanbebeneficialinapplications wheredeadloadminimizationisdesirable,suchasnon-loadbearingpanelsorarchitecturalcomponents.However,lower density also correlates with increased entrapped air and reduced packing efficiency, which influence strength development. Comparable density reductions have been documentedinexperimentalinvestigations,reinforcingthat rubber inclusion systematically lowers the mass per unit volumeofconcretewhilepreservingstructuralintegrityat modestreplacementlevels(Moolchandanietal.,2024).

5.3 Mechanical Performance

5.3.1

Strength Reduction and Interfacial Bonding Mechanism

Compressiveandflexural strengthreductionsobserved in this study are primarily linked to the weak interfacial transitionzone(ITZ)betweencrumbrubberparticlesand the cement matrix. Rubber is elastic and chemically inert comparedtomineralaggregates,leadingtopooradhesion and stress transfer. Under loading, these weak interfaces becomesitesformicrocrackinitiation,resultinginreduced load-bearingcapacity.Additionally,theinclusionofrubber increases void content and lowers stiffness, further contributingtostrengthloss.Despitethisreduction,strength gain with curing age follows normal hydration trends, indicating that cementitious reactions remain unaffected. These mechanisms align with established findings in rubberized concrete literature, where interfacial bonding andelasticmismatchareidentifiedasthedominantcauses ofstrengthdecline(Lietal.,2022).

5.4 Optimum Replacement Range

5.4.1 Performance

Balance at Lower Replacement Levels

A critical observation from the results is that mixes containing 5–10% crumb rubber demonstrate a favorable balance between mechanical performance and material sustainability. At these levels, reductions in strength and workabilityremainmoderatewhiledensitybenefitsbecome noticeable. Such mixes may be suitable for secondary structural elements, pavement layers, vibration-resistant components,orarchitecturalapplicationswhereenhanced ductilityandenergyabsorptionareadvantageous.Beyond 15–20%replacement,strengthdegradationbecomesmore pronounced,limitingstructuralapplicability.Thisthreshold behavior closely matches trends reported in prior investigations,whichidentifylowreplacementlevelsasthe practicaloptimumformaintainingengineeringperformance whileachievingenvironmentalbenefits(Moolchandanietal., 2024).

5.5 Comparison with Published Research

5.5.1

Alignment with Literature Trends

The experimental trends observed decreasing workability,reduceddensity,andgradualstrengthlosswith increasingcrumbrubbercontent areconsistentwiththe broader body of rubberized concrete research. Published studies consistently demonstrate that crumb rubber inclusionaltersfreshandhardenedconcretebehaviordueto its low stiffness, hydrophobicity, and poor interfacial bonding. Importantly, many researchers emphasize that controlled replacement levels can produce concrete with acceptableperformanceandimprovedductility,supporting itsroleinsustainableconstruction.Theagreementbetween present findings and existing literature strengthens the reliability of the experimental observations and confirms that crumb rubber concrete behaves predictably within established material science frameworks (Li et al., 2022; Moolchandanietal.,2024).

6. CONCLUSION

This study evaluated the performance of concrete incorporating crumb rubber as a partial replacement for natural fine aggregate at levels ranging from 5% to 20%. Experimental results demonstrate that crumb rubber significantly influences both fresh and hardened concrete properties. Workability showed a gradual reduction with increasingrubbercontent,primarilyduetothehydrophobic nature and irregular particle geometry of crumb rubber, which reduce internal lubrication within the mix. Density decreased consistently as replacement levels increased, indicating the production of lighter concrete that may be advantageousforapplicationswherereduceddeadloadis beneficial.

Mechanicalperformancerevealedaproportionaldeclinein compressive and flexural strength with increasing crumb rubbercontent,attributedtoweakinterfacialbondingand increasedvoidformation.However,mixescontaining5–10% crumb rubber retained strength values close to the target design requirements, suggesting their suitability for nonstructural and semi-structural applications. Strength development with curing age remained consistent, confirming that cement hydration was not adversely affected.

Thefindingsindicatethatcontrolledincorporationofcrumb rubbercan produce environmentallysustainableconcrete with acceptable engineering performance. The study supportsthepracticalfeasibilityoflow-levelcrumbrubber replacement as a strategy for waste tire utilization while maintainingfunctionalconcreteproperties.

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6.1. Limitations of the Study

Thisresearchislimitedtoevaluatingmechanicalandfresh concretepropertiesundercontrolledlaboratoryconditions and does not fully represent long-term field performance. Durabilityaspectssuchasfreeze–thawresistance,chemical attack, shrinkage, creep, and fatigue behavior were not extensively investigated. The study also focused on untreatedcrumbrubber,whereassurface-modifiedrubber may improve bonding and performance. Only a single concrete grade and fixed water–cement ratio were examined,whichrestrictsbroadergeneralizationofresults. Variability in crumb rubber particle size distribution and source characteristics may also influence outcomes. Additionally,economicfeasibilityandlarge-scaleproduction challenges were beyond the scope of this work. Future research should incorporate durability studies, treatment methods, and life-cycle assessment to validate practical implementation.

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