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
EXPERIMENTAL STUDY ON STRENGTH DEVELOPMENT AND DURABILITY CHARACTERISTICS OF MODIFIED CEMENT-BASED CONCRETE MIXTURES
Kanaklata Sagar1 , 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 - Concrete remains the most widely used constructionmaterial;however,itsconventionalformexhibits limitationssuchaslowtensilestrength,highpermeability,and poorresistancetoaggressive environmentalconditions. This study investigates the strength development and durability characteristics of modified cement-based concrete mixtures incorporating mineral and chemical admixtures. An experimental program was conducted using control and modified mixes with varying replacement levels of supplementary cementitious materials (0%, 10%, 20%, and 30%)whilemaintainingaconstantwater–cementratio.The performanceofconcretewasevaluatedthroughtestsonfresh properties (slump), mechanical strength (compressive, split tensile, and flexural strength), and durability indicators including water absorption, sorptivity, and chloride penetration. Results indicate that modified concrete exhibits improved workability and enhanced long-term strength compared to conventional concrete. The optimum performancewasobservedat20%replacementlevel,showing significant increases in compressive, tensile, and flexural strength. Additionally, durability characteristics improved substantially, with reduced permeability and water absorption, indicating a denser microstructure. Although early-age strength showed a slight reduction, long-term performance was superior due to pozzolanic reactions. The findings demonstrate that the use of modified concrete mixturescanenhancestructuralperformance,durability,and sustainabilityinmodernconstruction.
Key Words: Modified concrete, Strength development, Durability, Mineral admixtures, Supplementary cementitious materials, Sustainable construction
1. INTRODUCTION
1.1 Background
1.1.1
Importance of Concrete in Infrastructure
Concreteisthemostwidelyutilizedconstructionmaterialin civilengineeringduetoitsversatility,cost-effectiveness,and ease of production. It plays a fundamental role in the development of infrastructure such as buildings, bridges, highways,dams,andmarinestructures.Theglobaldemand forconcretecontinuestoincreasewithrapidurbanization and industrialization, making it indispensable for modern constructionpractices.Itsabilitytobemoldedintovarious shapesanditshighcompressivestrengthmakeitsuitablefor
diverse structural applications. However, the long-term performanceofconcretestructuresishighlydependenton their material properties and environmental exposure conditions(Neville,2011).
1.1.2 Need for Improved Performance and Sustainability
Despite its widespread use, conventional concrete faces challengesrelatedtodurability,environmentalimpact,and performance under aggressive conditions. Cement production, a key component of concrete, contributes significantly to global carbon dioxide emissions, raising sustainabilityconcerns.Additionally,moderninfrastructure requiresmaterialsthatcanwithstandharshenvironmental conditionswhilemaintaininglong-termstructuralintegrity. Asaresult,thereisanincreasingemphasisondeveloping high-performance and sustainable concrete through the incorporationofsupplementarycementitiousmaterialsand advanced admixtures, which enhance both mechanical properties and environmental compatibility (Mehta and Monteiro,2014).
1.2 Research Problem
1.2.1 Durability Issues in Concrete
Durabilityisacriticalconcerninconcretestructures,asit directly affects service life and maintenance costs. Conventional concrete is prone to issues such as high permeability,cracking,andchemicalattackfromchlorides andsulfates.Thesefactorsfacilitatetheingressofharmful substances, leading to reinforcement corrosion and structural deterioration. The presence of microcracks further accelerates degradation, especially in aggressive environments such as marine and industrial regions (Mindessetal.,2003).
1.2.2 Inconsistent Strength Development
Another major challenge in concrete technology is the variabilityinstrengthdevelopment.Factorssuchaswater–cement ratio, curing conditions, and material quality significantlyinfluencethestrengthofconcrete.Inmodified concrete,theinclusionofadmixturesintroducesadditional complexity,asimproperproportioningmayleadtoreduced early-agestrengthorunpredictablelong-termperformance. Thisinconsistencycreatesuncertaintyinstructuraldesign andperformanceassessment.
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
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1.2.3 Lack of Combined Admixture Studies
Whileextensiveresearchhasbeenconductedonindividual admixtures,thereislimitedunderstandingofthecombined effects of multiple modifiers in concrete. In practical applications,concretemixturesoftenincludeacombination of mineral and chemical admixtures, which interact in complexways.Theabsenceofcomprehensiveexperimental studiesontheseinteractionslimitstheabilitytoaccurately predictperformanceandoptimizemixdesign.
1.3 Research Gap
1.3.1
Limited Experimental Data on Combined Modifiers
Existingliteratureprimarilyfocusesontheeffectsofsingle admixtures on concrete properties, with relatively few studies addressing the synergistic effects of combined modifiers.Thisgapinknowledgerestrictsthedevelopment of advanced concrete mixtures that can simultaneously enhancestrengthanddurability.Asystematicexperimental investigation is therefore required to understand these combinedeffectsandestablishreliableperformancetrends (Thomas,2013).
1.3.2 Need for Optimized Mix Design
The lack of comprehensive data on multi-component systems highlights the need for optimized mix design strategies. Achieving an optimal balance between workability, strength, and durability requires careful selection and proportioning of materials. Without proper optimization, the benefits of admixtures may not be fully realized, leading to inefficient or suboptimal concrete performance.
1.4 Objectives
1.4.1
Evaluation of Mechanical Strength
The primary objective of this study is to evaluate the mechanical properties of modified concrete, including compressive, split tensile, and flexural strength. These parameters are essential for assessing the load-bearing capacityandstructuralperformanceofconcrete.
1.4.2
Study of Strength Development
Thisresearchaimstoinvestigatebothearly-ageandlongterm strength development of concrete mixes. Understanding the rate of strength gain is crucial for constructionschedulingandlong-termstructuralreliability.
1.4.3 Analysis of Durability Characteristics
The study also focuses on evaluating key durability parameters such as water absorption, permeability, and
resistancetochloridepenetration(RCPT).Theseindicators provideinsightintothelong-termperformanceofconcrete underenvironmentalexposure.
1.4.4 Comparative Performance Assessment
Acomparativeanalysisbetweenconventionalandmodified concrete mixes is conducted to quantify improvements in strengthanddurability.Thiscomparisonhelpsinidentifying theeffectivenessofdifferentmodifications.
1.4.5
Determination of Optimum Mix
Another importantobjectiveis to determine theoptimum replacement level of admixtures that provides the best combination of mechanical and durability properties, ensuringbothperformanceandsustainability.
1.5 Scope and Limitations
1.5.1
Laboratory-Based Study
The present research is conducted under controlled laboratoryconditionstoensureconsistencyandaccuracyin experimental results. While this approach minimizes external variability, it may not fully represent field conditions.
1.5.2
Selected Admixtures and Replacement Levels
The study is limited to selected mineral and chemical admixtureswithspecificreplacementlevels.Althoughthese materialsarecommonlyused,theresultsmaynotbedirectly applicabletoalltypesofconcretemixtures.
1.5.3
Time-Bound Durability Assessment
Durability evaluation is carried out over relatively short curingperiods(upto56days),whichmaynotfullycapture long-term performance. Extended studies are required to assess durability over the entire service life of concrete structures.
2. LITERATURE REVIEW
2.1 Overview of Conventional Concrete
2.1.1
Composition and Properties
Conventionalconcreteisacompositematerialcomposedof cement, fine aggregates, coarse aggregates, and water. Cementactsasthebindingagent,whileaggregatesprovide bulk and mechanical strength. The hydration of cement resultsintheformationofcalciumsilicatehydrate(C–S–H) gel,whichisprimarilyresponsibleforstrengthdevelopment. Thepropertiesofconcreteinbothfreshandhardenedstates dependontheproportionsandqualityoftheseconstituents. Fresh concrete must possess adequate workability for
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
proper placement and compaction, whereas hardened concreteshouldexhibitsufficientstrength,durability,and dimensional stability. Key properties include density, permeability, shrinkage, and resistance to environmental exposure(Neville,2011).
2.1.2
Strength Characteristics
Thestrengthofconventionalconcreteistypicallyevaluated in terms of compressive, tensile, and flexural strength. Compressivestrengthisthemostimportantparameterand is widely used for structural design and quality control. However,concreteexhibitsrelativelylowtensilestrength, which makes it prone to cracking under tensile stresses. Flexuralstrength,representingtheresistancetobending,is particularlysignificantinstructuralelementssuchasbeams andslabs.Theoverallperformanceofconcretedependson the balance between these strength parameters and is influenced by factors such as water–cement ratio, curing conditions,andmaterialproperties(Mindessetal.,2003)
2.1.3
Limitations
Despiteitsadvantages,conventionalconcretehasinherent limitationsthataffectitslong-termperformance.Oneofthe primary issues is its low tensile strength, leading to crack formation under stress or environmental effects. Additionally, conventional concrete often exhibits high permeability,allowingtheingressofwaterandharmfulions such as chlorides and sulfates. This results in durability problemsincludingreinforcementcorrosion,sulfateattack, andprogressivedeterioration.Furthermore,theproduction of cement contributes significantly to greenhouse gas emissions,raisingenvironmentalconcernsandnecessitating the development of more sustainable alternatives (Mehta andMonteiro,2014).
2.2 Modified Concrete Concepts
2.2.1
Definition and Classification
Modified concrete refers to concrete in which additional materials are incorporated to enhance its performance characteristics. These modifications can influence the hydrationprocess,microstructure,andoverallbehaviorof concrete.Basedonthetypeofmodification,concretecanbe classifiedintomineraladmixture-basedconcrete,chemically modifiedconcrete,fiber-reinforcedconcrete,andpolymermodified concrete. Each category offers specific benefits depending on the intended application and performance requirements(Aïtcin,2000).
2.2.2 Types of Modification
Variousmodificationtechniquesareemployedtoimprove the propertiesof concrete. Mineral admixtures suchasfly ash,silicafume,andGGBSareusedtoenhancestrengthand durability through pozzolanic reactions. Chemical
admixtures, including superplasticizers, retarders, and accelerators, are used to control workability and setting time. Fiber reinforcement improves tensile strength and crack resistance, while polymer modification enhances bonding,flexibility,andimpermeability.Thecombineduse ofthesemodificationshasgainedimportanceinproducing high-performanceanddurableconcrete(Neville,2012).
2.3 Mineral Admixtures
2.3.1 Fly Ash, Silica Fume, and GGBS
Mineral admixtures, also known as supplementary cementitiousmaterials(SCMs),arewidelyusedtoimprove concrete performance. Fly ash, a by-product of coal combustion,enhancesworkabilityandcontributestolongterm strength. Silica fume, a highly reactive material with extremelyfineparticles,significantlyincreasesstrengthand reducespermeability.Groundgranulatedblastfurnaceslag (GGBS), a by-product of the steel industry, improves durabilityandresistancetochemicalattack.Thesematerials are commonly used as partial replacements for cement, contributing to both performance enhancement and sustainability(Thomas,2013).
2.3.2
Effect on Strength and Durability
The inclusion of mineral admixtures leads to improved strengthanddurabilitythroughpozzolanicreactions.These reactions consume calcium hydroxide and produce additionalC–S–Hgel,resultinginadensermicrostructure. While early-age strength may be slightly reduced due to slower reaction rates, long-term strength is significantly enhanced.Additionally,reducedporosityandpermeability improve resistance to chloride ingress, sulfate attack, and otherenvironmentalfactors,therebyincreasingtheservice lifeofconcretestructures(MalhotraandMehta,2005).
2.4 Chemical Admixtures
2.4.1
Superplasticizers, Retarders, and Accelerators
Chemical admixtures are added to concrete in small quantities to modify its properties in both fresh and hardened states. Superplasticizers are high-range water reducersthatimproveworkabilitywithoutincreasingwater content,enablingtheproductionofhigh-strengthconcrete. Retardersareusedtodelaythesettingtime,makingthem suitable for hot weather conditions or large pours. Accelerators, on the other hand, increase the rate of hydrationandareusedtoachieveearlystrength,especially incoldclimates(Ramachandran,1995).
2.4.2
Influence on Hydration and Workability
Chemical admixtures significantly influence the hydration process and workability of concrete. Superplasticizers reducethewater–cementratio,leadingtohigherstrength
International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
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andimproveddurability.Retardersandacceleratorsmodify the rate of hydration, allowing better control over setting time and strength development. These admixtures also enhancecompactionandreducevoidformation,resultingin a more uniform and dense concrete matrix (Neville and Brooks,2010).
2.5 Fiber and Polymer Modification
2.5.1
Crack Resistance and Tensile Behavior
Fiber-reinforcedconcreteincorporatesdiscretefiberssuch as steel, polypropylene, or glass into the mix to improve tensile strength and crack resistance. Fibers act as crack arresters by bridging microcracks and preventing their propagation. This enhances theductilityand toughness of concrete, allowing it to withstand higher tensile stresses withoutsuddenfailure.Fiberreinforcementisparticularly effectiveinreducingshrinkageandthermalcracking(Bentur andMindess,2007).
2.5.2
Durability Enhancement
Polymer-modified concrete involves the addition of polymers such as latex or epoxy to improve bonding and impermeability.Polymersformacontinuousfilmwithinthe concretematrix,reducingporeconnectivityandlimitingthe ingress of water and harmful chemicals. This results in improved resistance to chemical attack, abrasion, and environmentaldegradation.Thecombineduseoffibersand polymers further enhances durability and structural performance,makingsuchconcretesuitablefordemanding applications(Ohama,1995).
2.6 Strength Development Mechanisms
2.6.1
Early vs Long-Term Strength
Strength development in concrete is a time-dependent process influenced by material composition and curing conditions. Conventional concrete typically exhibits rapid early-age strength due to cement hydration. In contrast, modifiedconcretecontainingmineraladmixturesmayshow slower early strength gain but achieves higher long-term strength.Thisdelayedstrengthdevelopmentisattributedto the gradual pozzolanic reaction, which continues over an extendedperiod(Taylor,1997).
2.6.2
Hydration and Pozzolanic Reactions
The primary mechanism of strength development in concreteisthehydrationofcement,whichproducesC–S–H gelandcalciumhydroxide.Inmodifiedconcrete,pozzolanic materialsreactwithcalciumhydroxidetoformadditionalC–S–H gel, enhancing the microstructure. This results in reduced porosity, improved strength, and increased durability.Thesynergisticeffectofhydrationandpozzolanic
reactions is essential for achieving high-performance concrete(Scriveneretal.,2015).
2.7 Durability Characteristics
2.7.1 Water Absorption and Permeability
Water absorption and permeability are key indicators of concretedurability.Highpermeabilityallowstheingressof water and aggressive agents, leading to deterioration. Modifiedconcretewithmineraladmixturesexhibitsreduced permeabilityduetoarefinedporestructure.Lowerwater absorption indicates a denser matrix and improved resistancetoenvironmentalexposure(Basheeretal.,2001).
2.7.2 Chloride and Sulfate Resistance
Durability of concrete is significantly influenced by its resistance to chloride and sulfate attack. Chloride ingress leads to corrosion of reinforcement, while sulfate attack causesexpansionandcracking.Theuseofsupplementary cementitiousmaterialsreducesthepermeabilityandalters the chemical composition of concrete, thereby enhancing resistance to these attacks. Improved durability ensures longer service life and reduced maintenance costs in aggressiveenvironments(Santhanametal.,2002).
3. MATERIALS AND METHODS
3.1 Research Methodology
3.1.1
Experimental Approach
The present study adopts an experimental research methodology to evaluate the strength development and durabilitycharacteristicsofmodifiedcement-basedconcrete mixtures.Asystematiclaboratory-basedapproachisusedto ensure accuracy, repeatability, and control over variables influencing concrete performance. The experimental programinvolvestheselectionofsuitablematerials,design ofconcretemixes,preparationofspecimens,andtestingof bothfreshandhardenedproperties.Thisapproachenables the generation of reliable quantitative data, which is essentialforanalyzingtheinfluenceofvariousmodifications onconcretebehavior.
3.1.2 Comparative Study (Control vs Modified Mixes)
A comparative framework is employed in which a conventionalconcretemix,referredtoasthecontrolmix,is preparedwithoutanymodificationandusedasabaseline. Modified concrete mixes are developed by incorporating selected admixtures at different replacement levels. The performanceofmodifiedmixesiscomparedwiththatofthe controlmixintermsofworkability,strength,anddurability. This comparative analysis facilitates the identification of improvements achieved through modification and helps determinethemosteffectivemixcomposition.
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3.2 Materials
3.2.1
Cement (OPC/PPC)
Cement is used as the primary binding material in the concretemix.OrdinaryPortlandCement(OPC)orPortland PozzolanaCement(PPC)isselectedbasedonavailabilityand compliance with relevant standards. The properties of cement,suchasconsistency,settingtime,andstrength,play acrucialroleindeterminingtheperformanceofconcrete.
3.2.2
Fine and Coarse Aggregates
Fineaggregate,typicallynaturalsandormanufacturedsand, isusedtofillvoidsbetweencoarseaggregatesandimprove workability.Coarseaggregates,generallycrushedstoneof specified sizes, provide bulk and strength to the concrete. The physical properties of aggregates, including grading, specificgravity,andwaterabsorption,influencethestrength anddurabilityoftheconcretemix.
3.2.3
Mineral Admixtures
Mineraladmixturessuchasflyash,silicafume,andground granulated blast furnace slag (GGBS) are incorporated as partialreplacementsforcement.Thesematerialscontribute to improved strength and durability through pozzolanic reactionsandhelpinreducingpermeabilityandenhancing themicrostructureofconcrete.
3.2.4 Chemical Admixtures
Chemicaladmixtures,particularlysuperplasticizers,areused toimproveworkabilitywithoutincreasingthewater–cement ratio.Theseadmixturesenhancetheflowabilityofconcrete and contribute to better compaction and strength development.
3.2.5 Water
Clean potable water is used for both mixing and curing of concrete.Thequalityofwaterisessential,asimpuritiesmay adversely affect the hydration process, strength, and durabilityofconcrete.
3.3
Mix Design
3.3.1 Basis of Mix Design (IS 10262:2019 and IS 456:2000)
Themixdesigniscarriedoutinaccordancewithstandard guidelines to ensure that the concrete meets the required strength and durability criteria. The design procedure considersfactorssuchasexposureconditions,workability requirements, and material properties. The objective is to achieveanoptimalproportionofingredientsforenhanced performance.
3.3.2 Target Strength Calculation
The target mean strength is determined to account for variationsinmaterialpropertiesandqualitycontrolduring production. It is calculated based on the characteristic strengthandstandarddeviation,ensuringthatthedesigned mixconsistentlyachievestherequiredperformancelevel.
3.3.3 Water–Cement Ratio Selection
Thewater–cementratioisselectedbasedonbothstrength and durability requirements. A lower water–cement ratio generally results in higher strength and reduced permeability, while maintaining adequate workability throughtheuseofadmixtures.
3.3.4
Trial Mixes
Trial mixes are prepared to validate the designed proportions and assess workability and strength. Adjustmentsaremadebasedontestresultstoachievethe desiredperformancecharacteristics.Thisiterativeprocess ensuresthereliabilityofthefinalmixdesign.
3.4 Experimental Variables
3.4.1
Admixture Type
Different types of admixtures, including mineral and chemical admixtures, are used to modify the concrete properties.Eachtypeofadmixturehasa specific effect on strengthdevelopmentanddurability.
3.4.2 Replacement Levels (0%, 10%, 20%, 30%)
The study investigates the effect of varying replacement levelsofcementwithadmixtures.Typicalreplacementlevels include 0% (control), 10%, 20%, and 30%, allowing for a systematicevaluationofperformancetrends.
3.4.3 Curing Periods (7, 28, 56 Days)
Concrete specimens are tested at different curing ages to assess both early-age and long-term performance. The selected curing periods provide insight into the rate of strength development and durability characteristics over time.
3.5 Specimen Preparation
3.5.1
Batching, Mixing, and Casting
Materials are batched using the weight method to ensure accuracy and consistency. Mixing is carried out using a laboratorymixertoachieveahomogeneousmix.Concreteis thencastintostandardmouldscorrespondingtodifferent tests,ensuringuniformspecimenpreparation.
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3.5.2 Compaction and Curing
Compactionisperformedusingvibrationormanualtamping to remove entrapped air and achieve maximum density. After casting, specimens are cured under standard conditions, typically by immersion in water, to ensure properhydrationandstrengthdevelopment.
3.6 Testing Procedures
3.6.1
Fresh Concrete Tests
Slump Test
Theslumptestisconductedtoevaluatetheworkabilityof freshconcrete.Itmeasurestheconsistencyandeaseofflow, whichareessentialforproperplacementandcompaction.
Compaction Factor Test
The compaction factor test provides a measure of workability, particularly for low-workability mixes. It indicatesthedegreeofcompactionachievedunderstandard conditions.
3.6.2 Strength Tests
Compressive Strength
Compressivestrengthisdeterminedusingcubespecimens testedunderacompressiontestingmachine.Itrepresents the load-bearing capacity of concrete and is a primary parameterforstructuraldesign.
Split Tensile Strength
Thesplittensilestrengthtestevaluatesthetensilebehavior of concrete indirectly. It provides insight into cracking resistance and the effectiveness of modifications in improvingtensileproperties.
4. RESULTS
4.1 Fresh Concrete Properties
4.1.1 Workability Results (Slump and Compaction Factor)
The workability of concrete mixes was evaluated using slumpandcompactionfactortests.Theresultsindicatethat the incorporation of mineral admixtures, along with superplasticizers,significantlyimprovedtheflowabilityof concrete.Thecontrolmixexhibitedmoderateworkability, whereasmodifiedmixesshowedenhancedconsistencydue to reduced water demand and improved particle packing. However, at higher replacement levels (30%), a slight reduction in workability was observed, possibly due to increasedsurfaceareaoffineparticlesrequiringadditional water.
Table 1: Workability Results
4.2.3 Flexural Strength
Flexuralstrengthresultsfollowedasimilartrendastensile strength, with modified mixes outperforming the control mix. The improved flexural performance is attributed to enhancedinterfacialbondingandreducedmicrocracking.
Table 2: Flexural Strength (MPa)
4.3 Durability Results
4.3.1 Water Absorption
Water absorption values decreased significantly with the inclusionofmineraladmixtures.Thereductionindicatesa denser concrete matrix with lower porosity, enhancing resistancetomoistureingress.
Table 3: Water Absorption (%) S.No
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5. CONCLUSIONS
This study investigated the strength development and durabilitycharacteristicsofmodifiedcement-basedconcrete mixturesincorporatingmineralandchemicaladmixturesat varying replacement levels. Based on the experimental results,itisconcludedthattheinclusionofsupplementary cementitious materials significantly enhances both mechanicalanddurabilitypropertiesofconcrete.Althougha slight reduction in early-age compressive strength was observed in modified mixes, long-term strength showed considerable improvement due to ongoing pozzolanic reactions and the formation of additional calcium silicate hydrate gel. Among all mixes, the 20% replacement level demonstratedoptimumperformance,exhibitingthehighest compressive,splittensile,andflexuralstrengths.
Workability of concrete improved with the use of superplasticizers, enabling lower water–cement ratios without compromising consistency. Durability indicators such as water absorption, sorptivity, and chloride ion penetration were markedly reduced in modified mixes, confirmingthedevelopmentofadenserandlesspermeable microstructure.Theseimprovementsdirectlycontributeto enhancedresistanceagainstenvironmentaldegradationand increasedservicelifeofconcretestructures.
Statistical analysis further validated the reliability and consistencyoftheexperimentalresults,withlowstandard deviation values indicating uniform performance. Overall, the study demonstrates that modified concrete mixtures provideaviableandsustainablealternativetoconventional concrete, offering improved structural performance, durability,andreducedenvironmentalimpact.
6. FUTURE SCOPE OF RESEARCH
Future research can focus on extending the durability assessmenttolongerperiods,suchas90days,180days,and beyond, to better understand long-term performance. Advanced microstructural analysis techniques such as scanning electron microscopy(SEM)and X-raydiffraction (XRD)canbeemployedtoinvestigatetheinternalstructure and hydration mechanisms in greater detail. The use of emerging materials such as nano-silica, graphene, and geopolymer binders may further enhance concrete performance and sustainability. Additionally, field-based studies are recommended to validate laboratory findings under real environmental and loading conditions. The application of statistical and machine learning models for mix optimization can also be explored to develop more efficientandpredictivedesignmethodologies.
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