Investigating the rheological properties and compatibility behaviours of RET/PE and WR/CR/SBS compound-modified bitumen

Two types of elastomer/plastic compound-modified bitumen were developed by means of incorporating the reactive elastomeric terpolymer (RET) into the plastic (high-density polyethylene HDPE or recycled polyethylene RPE) modified bitumen and adding the wax residue (WR) into the bitumen/elastomer (crumb rubber CR or styrene–butadiene–styrene SBS) blends.Therheologicalproperties,morphologymicrostructureandstorage stabilityofthesenovelelastomer/plasticcompound-modifiedbinderswerecharacterised.TheresultsrevealedthatRETelastomerpositivelyimproved thehigh-temperaturemodulus,temperatureinsensitivity,rutresistant,elasticrecoveryandshear-resistanceofHDPE-andRPE-modifiedbitumen. However,excessiveRETdosageadverselyinfluencedthecrackingresis-tanceofplastic-modifiedbitumen,anditsoptimumdosagewasrecom-mendedas1wt%.Moreover,RETelastomersignificantlystrengthenedthestoragestabilityofHDPEandRPE-modifiedbinders.Theelasticityimprove-menteffectofRETwasattributedtothegeneratedpolymernetwork.Ontheotherhand,addingWRlimitedlydeterioratedtheruttingresistance andweakenedtheelasticrecoveryperformanceofelastomer(CRandSBS)modifiedbitumen.Toensurethelow-temperatureperformance,theopti-mumlevelofWRwas2wt%.Furthermore,theadditionofWRpromotedthecompatibilityanddispersionofCRandSBSmodifiersinbitumen.

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