International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 13 Issue: 05 | May 2026 www.irjet.net p-ISSN: 2395-0072
ENVIRONMENTAL PERFORMANCE ANALYSIS OF RECYCLED PLASTIC UTILIZATION PATHWAYS IN CIVIL INFRASTRUCTURE SYSTEMS
Sonam Jaiswal1 , Mr. Ushendra Kumar2
1Master of Technology, Civil Engineering, Lucknow Institute of Technology, Lucknow, India
2Head of Department, Department of Civil Engineering, Lucknow Institute of Technology, Lucknow, India
Abstract: The rapid growth of plastic waste has emerged as a critical environmental challenge, necessitating sustainable management strategies that align with circular economyprinciples.Thisstudyinvestigatestheenvironmental performance of recycled plastic utilization pathways in civil infrastructure systems, focusing on plastic-modified bituminous roads, plastic aggregate concrete, and geotechnical applications. A comprehensive Life Cycle Assessment (LCA) approach is employed to evaluate key environmentalindicators,includingGlobalWarmingPotential (GWP), energy consumption, and resource depletion, using a cradle-to-grave system boundary. Standard functional units such as 1 km of road, 1 m³ of concrete, and 1 m³ of stabilized soilareadoptedtoensureconsistencyandcomparability.The resultsindicatethatplastic-modifiedasphaltdemonstratesthe most significant environmental benefits, primarily due to reduced bitumen consumption and lower greenhouse gas emissions. Plastic aggregate concrete shows moderate environmentalimprovements,whilegeotechnicalapplications offerlocalizedsustainabilityadvantages.However,trade-offs such as energy use during processing and potential microplastic release are identified. The study provides a comparative framework for evaluating sustainability across multiplepathwaysandsupportsinformeddecision-makingfor infrastructure development. The findings highlight the potentialofrecycledplasticstoreduceenvironmentalimpacts while improving material efficiency in civil engineering applications.
Key Words: Recycled plastics; Life Cycle Assessment; Sustainable infrastructure; Plastic-modified asphalt; Environmental impact; Circular economy; Carbon footprint; Civil engineering materials
1. INTRODUCTION
1.1 Background
1.1.1 Global Plastic Waste Crisis
The exponential growth in plastic production over recent decadeshasresultedinasevereglobalwastemanagement challenge.Plasticsarewidelyused due to theirdurability, versatility,and low cost; however, these same properties contribute to their persistence in the environment. Global plasticproductionhasexceeded400milliontonnesannually, withasignificantproportionconsistingofsingle-useplastics thatarediscardedafterashortlifecycle.Alargefractionof
this waste is either landfilled, incinerated, or leaked into natural ecosystems, leading to long-term environmental degradation. The accumulation of plastic waste in oceans and terrestrial environments has intensified concerns regardingbiodiversityloss, ecosystem disruption, and the proliferationofmicroplastics,whichcanenterthefoodchain andposeriskstohumanhealth(Geyeretal.,2017).
1.1.2
Environmental Concerns and Need for Sustainable Materials
The environmental implications of plastic waste extend beyondpollution,encompassinggreenhousegasemissions, resourcedepletion,andecologicalimbalance.Conventional waste management practices such as landfilling and incinerationareincreasinglyviewedasunsustainabledueto their associated environmental impacts, including soil contamination and air pollution. Simultaneously, the constructionindustryisrecognizedasamajorcontributorto global environmental degradation through intensive consumption of natural resources and high carbon emissions, particularly from cement and aggregate production. In this context, the integration of recycled materials, especially plastics, into civil engineering applications offers a promising pathway toward sustainability.Suchapproachesalignwithcirculareconomy principles by promoting resource efficiency, waste minimization, and reduced environmental footprint (Hopewelletal.,2009).
1.2 Recycled Plastics in Civil Engineering
1.2.1 Types of Recycled Plastics (PET, HDPE, LDPE, PP)
Recycled plastics used in civil engineering are predominantly thermoplastics, which can be reprocessed and remoulded without significant alteration in their chemical structure. Among these, Polyethylene Terephthalate (PET), High-Density Polyethylene (HDPE), Low-DensityPolyethylene(LDPE),andPolypropylene(PP) arethemostcommonlyutilizedmaterials.PETisknownfor itshightensilestrengthandstiffness,makingitsuitablefor fiber reinforcement in concrete. HDPE exhibits excellent chemical resistance and durability, enabling its use in geosyntheticsandpipingsystems.LDPE,characterizedbyits flexibility,isfrequentlyusedinbituminousmixestoimprove binding properties, while PP is valued for its fatigue
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 13 Issue: 05 | May 2026 www.irjet.net p-ISSN: 2395-0072
resistance and is widely applied in fiber-reinforced composites. The selection of plastic type depends on the desired engineering performance and application requirements(Alqahtanietal.,2022).
1.2.2 Major Infrastructure Applications
Recycledplasticshavebeensuccessfullyincorporatedinto various civil infrastructure systems through multiple applicationpathways.Oneofthemostprominentusesisin road construction, where plastic waste is blended with bitumentoproduceplastic-modifiedasphaltwithenhanced durability and resistance to deformation. In concrete technology, recycled plastics are used either as partial replacementsfornaturalaggregatesorasreinforcingfibers, contributingtoreducedmaterialdensityandimprovedcrack resistance.Additionally,ingeotechnicalengineering,plastics are employed in soil stabilization and reinforcement applications,wheretheyenhanceload-bearingcapacityand reduce settlement. These applications demonstrate the versatility of recycled plastics in addressing both engineeringperformanceandenvironmentalsustainability challenges(KumarandGarg,2021).
1.3 Research Gap
1.3.1
Lack of Lifecycle-Based Environmental Assessment
Despite the increasing adoption of recycled plastics in construction, existing research has largely focused on mechanicalandstructuralperformance,withcomparatively limitedattentiongiventoenvironmentalimpactsacrossthe lifecycle. Most studies evaluate short-term engineering benefits without considering upstream and downstream processessuchasmaterialprocessing,transportation,and end-of-life disposal. This lack of comprehensive lifecyclebasedassessmentrestrictstheabilitytoaccuratelyquantify the environmental benefits and trade-offs associated with recycledplasticapplications.Theapplicationofstandardized methodologiessuchasLifeCycleAssessment(LCA)remains limited,leadingtofragmentedandincompleteevaluationsof sustainability(ISO14040,2006).
1.3.2 Limited Comparative Studies Across Utilization Pathways
Another significant research gap is the scarcity of comparativestudiesthatevaluatemultiplerecycledplastic utilizationpathwayswithinaunifiedanalyticalframework. While individual applications such as plastic-modified asphalt or plastic aggregate concrete have been studied independently, there is a lack of integrated research comparing their environmental performance under consistent conditions. This limitation makes it difficult to identifythemostsustainableandefficientpathwayforlargescaleimplementation.Asystematiccomparativeanalysisis essential to understand trade-offs between different
applications and to support informed decision-making in infrastructuredevelopment(Guinéeetal.,2011).
1.4 Research Objectives
1.4.1 Identification of Utilization Pathways
Thefirstobjectiveofthisstudyistoidentifyandcategorize themajorpathwaysthroughwhichrecycledplasticscanbe utilized in civil infrastructure systems. This involves examiningexistingapplicationssuchasroadconstruction, concrete production,andgeotechnical engineering, with a focusontheirtechnicalfeasibility,scalability,andrelevance tocurrentconstructionpractices.
1.4.2
Environmental Performance Assessment Using LCA
The second objective is to evaluate the environmental performanceoftheseutilizationpathwaysusingLifeCycle Assessment(LCA).Thismethodologyprovidesasystematic frameworkforquantifyingenvironmentalimpactsacrossthe entirelifecycle,including material production, processing, use, and disposal. Key indicators such as Global Warming Potential,energyconsumption,andresourcedepletionare consideredtoensureacomprehensiveassessment.
1.4.3 Comparative Sustainability Evaluation
Thefinalobjectiveistoperformacomparativesustainability evaluation of the selected pathways by integrating environmentalandengineeringperformanceindicators.This analysis aims to identify the most sustainable option by consideringbothbenefitsandtrade-offs,therebysupporting evidence-baseddecision-makingfortheadoptionofrecycled plasticsincivilinfrastructuresystems.
2. LITERATURE REVIEW
2.1 Plastic Waste and Environmental Challenges
2.1.1
Global and Indian Scenario
Therapidincreaseinplasticproductionhasledtoaparallel rise in plastic waste generation, creating a significant environmental burden worldwide. Globally, plastic productionhassurpassed400milliontonnesannually,with aconsiderableproportionconsistingofshort-livedproducts that quickly enter the waste stream. Inefficient waste managementsystems,particularlyindevelopingcountries, haveresultedinlargequantitiesofplasticbeingmismanaged andleakingintonaturalecosystems.InIndia,thesituationis equallycriticalduetorapidurbanization,populationgrowth, andchangingconsumptionpatterns.Thecountrygenerates millionsoftonnesofplasticwasteeachyear,asubstantial portion of which remains uncollected or improperly disposedof.AlthoughregulatoryframeworkssuchasPlastic WasteManagementRuleshavebeenintroduced,challenges relatedtosegregation,recyclinginfrastructure,andpublic
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 13 Issue: 05 | May 2026 www.irjet.net p-ISSN: 2395-0072
awarenesspersist,limitingeffectivewasteutilization(CPCB, 2022).
2.1.2
Environmental Impacts
Plastic waste poses severe environmental risks across terrestrial and aquatic ecosystems. Due to its nonbiodegradablenature,plasticpersistsintheenvironmentfor extendedperiods,leadingtoaccumulationinlandfills,rivers, and oceans. This accumulation adversely affects wildlife throughingestionandentanglement,whilealsodisrupting naturalhabitats.Additionally,thefragmentationofplastics intomicroplasticshasemergedasamajorconcern,asthese particles can enter the food chain and potentially impact humanhealth.Conventionaldisposalmethodssuchasopen burning and incineration release toxic pollutants and greenhousegases,contributingtoairpollutionandclimate change.Theseenvironmentalchallengeshighlighttheurgent need for sustainable waste management strategies and innovativereuseapproaches(Rochmanetal.,2013).
2.2 Recycled Plastic Applications in Infrastructure
2.2.1
Asphalt and Pavements
The use of recycled plastics in asphalt and pavement construction is one of the most widely adopted and successfulapplicationsincivilengineering.Plastic-modified bitumen involves the incorporation of shredded plastic waste into asphalt mixtures, either through dry or wet processes. This modification enhances the binding properties of bitumen and improves the mechanical performanceofpavements,includingresistancetorutting, cracking, and moisture damage. Field implementations, particularly in countries like India, have demonstrated improved durability and extended service life of plastic roads.Theabilitytoutilizelargevolumesofwasteplasticin road construction makes this application highly attractive from both environmental and economic perspectives (Vasudevanetal.,2012).
2.2.2
Concrete Applications
Recycled plastics are increasingly being explored as alternativematerialsinconcreteproduction,eitheraspartial replacementsfornaturalaggregatesorasreinforcingfibers. The inclusion of plastic aggregates reduces the density of concrete and contributes to resource conservation by minimizingtheuseofnaturalmaterials.Plasticfibers,onthe otherhand,enhancecrackresistance,ductility,andimpact strength.However,theincorporationofplasticsmayleadto a reduction in compressive strength if used in excessive quantities,primarilyduetoweakerbondingwiththecement matrix.Despitethesechallenges,plastic-modifiedconcrete offers potential environmental benefits, particularly in reducingwasteandconservingrawmaterials(Alqahtaniet al.,2022).
2.2.3 Geotechnical Applications
Ingeotechnicalengineering,recycledplasticsareutilizedfor soilstabilizationandreinforcementpurposes.Plasticstrips, fibers, and geosynthetics are incorporated into soil to improveitsshearstrength,reducesettlement,andenhance load-bearing capacity. Materials such as HDPE and PP are commonly used in geotextiles and geomembranes for applicationsincludingembankments,retainingstructures, and landfill liners. These applications are particularly beneficial in weak or expansive soils, where traditional stabilizationmethodsmaybelesseffectiveormorecostly. Theuseofrecycledplasticsingeotechnicsnotonlyimproves engineering performance but also provides an effective solutionforwasteutilization(KumarandGarg,2021).
2.3 Environmental Assessment Techniques
2.3.1
Life Cycle Assessment (LCA)
Life Cycle Assessment (LCA) is a systematic methodology usedtoevaluatetheenvironmentalimpactsofmaterialsand processes throughout their entire lifecycle, from raw material extraction to final disposal. It provides a comprehensive framework for assessing sustainability by consideringallstages,includingproduction,transportation, use,andend-of-lifemanagement.LCAisstandardizedunder international guidelines and is widely applied in civil engineering to compare alternative materials and technologies.Byquantifyingenvironmentalimpactsacross multiple categories, LCA enables researchers and practitioners to identify trade-offs and make informed decisions regarding sustainable material selection (ISO 14040,2006).
2.3.2 Environmental Indicators (GWP, Energy, Toxicity)
Environmental impact assessment within LCA relies on specific indicators that quantify different aspects of sustainability.GlobalWarmingPotential(GWP)isoneofthe most critical indicators, measuring greenhouse gas emissions in terms of carbon dioxide equivalents. Energy consumptionisanotherkeyparameter,reflectingthetotal energyrequiredacrossthelifecycleofamaterialorprocess. Additionally, toxicity indicators evaluate the potential impactsonhumanhealthandecosystemsduetotherelease of hazardous substances. These indicators collectively provideacomprehensiveunderstandingofenvironmental performanceandenablecomparisonbetweenconventional and alternative materials in infrastructure applications (Finnvedenetal.,2009).
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
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2.4 Comparative Studies and Existing Findings
2.4.1
Performance vs Sustainability Trade-offs
Existingstudiesonrecycledplasticapplicationshighlighta complexrelationshipbetweenengineeringperformanceand environmentalsustainability.Whileplastic-modifiedasphalt has consistently demonstrated superior durability and reduced maintenance requirements, its environmental benefitsdependonfactorssuchasprocessingmethodsand transportationdistances.Inconcreteapplications,theuseof recycledplasticscontributestoresourceconservation but maycompromisemechanicalstrengthathigherreplacement levels. Similarly, geotechnical applications offer localized improvements in soil performance but require further validation for large-scale implementation. These findings indicatethatnosingleapplicationuniversallyoutperforms others across all criteria; instead, each pathway involves trade-offs between performance, cost, and environmental impact.Therefore,acomprehensivecomparativeframework isessentialtoevaluatethesetrade-offsandidentifythemost sustainable solutions for infrastructure development (Guinéeetal.,2011).
3. MATERIALS AND METHODS
3.1 Research Framework
3.1.1 Quantitative and Comparative Approach
The present study adopts a quantitative and comparative research framework to evaluate the environmental performanceofrecycledplasticutilizationpathwaysincivil infrastructuresystems.Aquantitativeapproachenablesthe systematicmeasurementofenvironmentalindicatorssuch as emissions, energy consumption, and resource use, ensuring objectivity and reproducibility of results. The comparativenatureofthestudyfacilitatestheevaluationof multiple application pathways namely plastic-modified bitumen, plastic aggregate concrete, and geotechnical applications under consistent conditions. This approach ensures that the performance of each pathway can be assessed relative to others using standardized metrics, therebyenablingarobustevaluationofsustainability.
3.1.2
Integration of Engineering and Environmental Analysis
Akeyfeatureoftheresearchframeworkistheintegrationof engineeringperformancewithenvironmentalassessment. While environmental indicators provide insights into sustainability, engineering parameters such as durability, strength, and workability are essential for practical implementation in infrastructure systems. The study therefore combines Life Cycle Assessment (LCA) with engineeringconsiderationstodevelopaholisticevaluation framework.Thisintegratedapproachensuresthatmaterials arenotonlyenvironmentallybeneficialbutalsotechnically
viable,therebysupportinginformeddecision-makingincivil engineeringpractice.
3.2 Selection of Utilization Pathways
3.2.1 Plastic-Modified Bitumen
Plastic-modifiedbitumenisselectedasoneoftheprimary utilization pathways due to its widespread adoption and proven performance in road construction. In this method, shredded plastic waste is incorporated into bituminous mixes, improving binding properties and enhancing resistance to rutting, cracking, and moisture damage. The abilitytoutilizesignificantquantitiesofwasteplasticandits compatibilitywithexistingconstructionpracticesmakethis pathwayhighlyrelevantforlarge-scaleimplementation.
3.2.2 Plastic Aggregate Concrete
Thesecondpathwayinvolvestheuseofrecycledplasticsin concrete, either as partial replacements for natural aggregates or as reinforcing fibers. This approach contributes to resource conservation by reducing dependence on conventional materials while offering potential improvements in certain mechanical properties such as crack resistance. However, the performance of plastic-modified concrete depends on the proportion and typeofplasticused,necessitatingcarefulevaluation.
3.2.3 Geotechnical Applications
Geotechnical applications represent the third pathway, where recycled plastics are used for soil stabilization and reinforcement. Plastic fibers, strips, and geosynthetics enhancesoilstrength,reducesettlement,andimproveloadbearingcapacity.Theseapplicationsareparticularlyuseful in weak soil conditions and offer an effective solution for utilizingplasticwasteininfrastructureprojects.
3.3 Material Characterization
3.3.1
Types of Plastics (PET, HDPE, LDPE, PP)
The study focuses on commonly available thermoplastic materials,includingPolyethyleneTerephthalate(PET),HighDensity Polyethylene (HDPE), Low-Density Polyethylene (LDPE),andPolypropylene(PP).Theseplasticsareselected due to their widespread availability in municipal waste streamsandtheirsuitabilityforrecycling.Eachtypeexhibits distinctphysicalandmechanicalproperties,influencingits applicability in different construction scenarios. For instance, PET is known for its high strength, HDPE for its durability,LDPEforflexibility,andPPforfatigueresistance.
3.3.2 Key Properties and Standards
Material characterization involves the evaluation of key propertiessuchasdensity,tensilestrength,andmeltflow index,whichinfluenceprocessingbehaviorandperformance
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 13 Issue: 05 | May 2026 www.irjet.net p-ISSN: 2395-0072
inconstructionapplications.Standardizedtestingmethods areemployedtoensureconsistencyandreliabilityofresults. Thesestandardsfacilitatethecomparisonofmaterialsand ensure that recycled plastics meet the required specificationsforengineeringuse.Propercharacterizationis essential for ensuring quality control and enhancing the performanceofplastic-basedconstructionmaterials.
3.4 Life Cycle Assessment (LCA) Methodology
3.4.1
Goal and Scope Definition
TheprimarygoaloftheLifeCycleAssessment(LCA)inthis studyistoevaluateandcomparetheenvironmentalimpacts ofdifferentrecycledplasticutilizationpathways.Thescope is defined to include all relevant stages of the lifecycle, ensuringacomprehensiveassessment.Functionalunitsare established to provide a consistent basis for comparison, including1kmofroadforpavementapplications,1m³of concreteforstructuralapplications,and1m³ofstabilized soil for geotechnical applications. These units reflect practical engineering quantities and enable meaningful comparisonacrossdifferentsystems.
3.4.2
System Boundary: Cradle-to-Grave Approach
Acradle-to-gravesystemboundaryisadoptedtocapturethe completelifecycleofmaterialsandprocesses.Thisincludes rawmaterialextraction,plasticwastecollection,processing, transportation, construction, use phase, and end-of-life disposalorrecycling.Byconsideringallstages,theanalysis ensuresthatenvironmentalimpactsarenotunderestimated andprovidesaholisticevaluationofsustainability.
3.4.3
Life Cycle Inventory (LCI)
TheLifeCycleInventoryphaseinvolvesthecollectionand quantificationofallinputsandoutputsassociatedwitheach utilizationpathway.Inputsincludematerialssuchasplastic waste,aggregates,cement,andbitumen,aswellasenergy usedduringprocessingandconstruction.Outputsconsistof emissions released into air, water, and soil, including greenhousegasesandotherpollutants.Accurateinventory data is critical for ensuring the reliability of subsequent impactassessment.
3.4.4
Life Cycle Impact Assessment (LCIA)
TheLifeCycleImpactAssessmentphasetranslatesinventory dataintoenvironmentalimpactindicators.Inthisstudy,key indicators include Global Warming Potential (GWP), expressedintermsofCO₂equivalents,energyconsumption, and resource depletion. These indicators provide a comprehensivemeasureofenvironmentalperformanceand enablecomparisonbetweendifferentutilizationpathways. TheLCIAresultsformthebasisforevaluatingsustainability andidentifyingenvironmentallypreferableoptions.
3.5 Comparative Analysis Method
3.5.1 Multi-Criteria Decision Analysis (MCDA)
Tofacilitateasystematiccomparisonofdifferentutilization pathways, Multi-Criteria Decision Analysis (MCDA) is employed.Thismethodallowstheevaluationofalternatives based on multiple criteria, including environmental, engineering, and economic indicators. MCDA provides a structured framework for decision-making, enabling the integration of diverse performance metrics into a single evaluationsystem.
3.5.2 Weight-Based Ranking System
A weight-based ranking system is used within the MCDA framework to assign relative importance to different evaluationcriteria.Forinstance,environmentalindicators such as GWP and energy consumption may be assigned higher weights in sustainability-focused studies, while engineeringperformancemayalsobeconsideredsignificant. Each pathway is scored based on these weighted criteria, resulting in a composite ranking that identifies the most sustainable and efficient option. This approach ensures transparencyandflexibilityindecision-making,allowingfor adaptationbasedonspecificprojectrequirementsorpolicy priorities.
4. RESULTS
4.1 Identified Utilization Pathways
Theanalysisidentifiedthreemainrecycledplasticutilization pathways in civil infrastructure systems: plastic-modified bituminous roads, plastic aggregate concrete, and geotechnical applications. These pathways were selected based on data availability, practical relevance, and compatibility with existing engineering practices. Each pathway represents a distinct application domain where recycledplasticscanbeeffectivelyincorporated.
4.2 Environmental Impact Results
4.2.1
Global Warming Potential (GWP)
The Life Cycle Assessment results indicate variations in greenhouse gas emissions across different utilization pathways. Plastic-modified bitumen shows a reduction in GlobalWarmingPotentialcomparedtoconventionalasphalt duetopartialreplacementofbitumenandreduceddemand for energy-intensive materials. Plastic aggregate concrete alsodemonstratesloweremissionsrelativetoconventional concrete, primarily due to decreased use of natural aggregates.Geotechnicalapplicationsexhibitcomparatively lower emissions due to minimal material processing requirements.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
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4.2.2 Energy Consumption
The lifecycle energy demand varies among the selected pathways.Plastic-modifiedasphaltexhibitsreducedenergy consumption due to lower bitumen usage and efficient material processing. Plastic aggregate concrete shows moderateenergysavingsassociatedwithreducedextraction and processing of natural aggregates. Geotechnical applicationsdemonstraterelativelylowenergydemand,as theyrequireminimalprocessingandutilizelocallyavailable materials.
4.2.3 Resource Utilization
The incorporation of recycled plastics contributes to a reductionintheconsumptionofnaturalresourcessuchas aggregates and bitumen. Plastic-modified asphalt reduces bitumen demand by approximately 8–10%, while plastic aggregateconcretedecreasesrelianceonnaturalaggregates. Geotechnicalapplicationsreducetheneedforconventional stabilization materials by utilizing plastic-based reinforcements.
4.3 Comparative Performance
4.3.1
Ranking of Pathways Based on Indicators
A comparative evaluation of the selected pathways was conducted based on environmental indicators, including GWP, energy consumption, and resource utilization. The resultsindicatethatplastic-modifiedasphaltrankshighestin terms of overall environmental performance, followed by plasticaggregateconcreteandgeotechnicalapplications.The rankingreflectstherelativeperformanceofeachpathway basedontheselectedindicators.
5.CONCLUSION
This study evaluated the environmental performance of recycledplasticutilizationpathwaysincivilinfrastructure systemsusingacomprehensiveLifeCycleAssessment(LCA) framework. Three major applications plastic-modified bituminous roads, plastic aggregate concrete, and geotechnical stabilization were analyzed based on key environmental indicators, including Global Warming Potential (GWP), energy consumption, and resource utilization.Theresultsdemonstratethattheincorporationof recycled plastics can significantly reduce environmental impactscomparedtoconventionalconstructionmaterials.
Among the selected pathways, plastic-modified asphalt emerged as the most environmentally efficient option, primarilyduetoreducedbitumenconsumptionandlower greenhouse gas emissions. Plastic aggregate concrete showed moderate environmental benefits, particularly in terms of resource conservation and reduced aggregate usage,althoughperformancevariabilityremainsaconcern. Geotechnical applications provided localized advantages
with relatively low energy demand and improved soil performance.
The study also highlights the importance of considering lifecycle-based assessment rather than focusing solely on mechanical properties. While environmental benefits are evident, certain trade-offs such as energy use during processing and potential long-term impacts, including microplastic release, must be carefully addressed. The integrationofenvironmentalandengineeringperformance providesaholisticframeworkforevaluatingsustainabilityin infrastructuresystems.
Overall, the findings confirm that recycled plastics offer a viable and sustainable alternative for civil engineering applications, supporting waste reduction, resource conservation, and environmentally responsible infrastructuredevelopment.
5.1.Future Scope of Research
Futureresearchshouldfocusonlong-term environmental and structural performance of recycled plastic-based materials under real field conditions. Detailed studies on microplasticrelease,leachingbehavior,anddurabilityover extendedservicelifeareessentialtoensureenvironmental safety. Additionally, the integration of Life Cycle Cost Analysis (LCCA) with LCA can provide a more comprehensivesustainabilityassessmentbyincorporating economicconsiderations.
Furtherinvestigationisrequiredtooptimizetheproportion and processing techniques of recycled plastics to enhance both environmental and mechanical performance. The developmentofstandardizedguidelinesandqualitycontrol measures will also support large-scale implementation. Moreover, expanding the analysis to include emerging applications such as plastic composites and modular constructionsystemscanbroadenthescopeofsustainable infrastructuresolutions.
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