6533b86dfe1ef96bd12ca215

RESEARCH PRODUCT

Optimisation of liquid rubber modified bitumen for road pavements and roofing applications

Ayad SubhyAna Jiménez Del Barco CarriónMaria Angeles Izquierdo RodriguezDavide Lo PrestiDavide Lo Presti

subject

Recycled tyre rubberMaterials science0211 other engineering and technologiesEBS020101 civil engineering02 engineering and technologyAsphalt mixtures0201 civil engineeringEthylene bischemistry.chemical_compoundResponse surface methodologyNatural rubberRheology021105 building & constructionGeneral Materials ScienceResponse surface methodologyComposite materialCivil and Structural EngineeringPolymer modifiedWaxBuilding and ConstructionRoofing membranesLiquid rubberchemistryAsphaltLiquid rubbervisual_artvisual_art.visual_art_mediumSBS modified bitumen

description

Abstract Polymer Modified Bitumens (PMBs) are largely used for pavement and roofing membranes applications with Styrene-Butadiene-Styrene Block copolymer (SBS) playing a major role in both markets despite its constantly increasing price due to the rising demand for quality bitumen modifiers. On the other hand, there is an increasing trend of recycling end of life tyres generating Recycled Tyre Rubber (RTR) at affordable price. This investigation aims at engineering a modified bitumen with a combination of Liquid Rubber (LR), a homogeneous blend of 50–70% RTR pre-processed in combination with heavy oils, and a wax denominated Ethylene Bis Stearamide (EBS). In the first phase, the effect of LR and EBS was independently characterised and compared to PMBs. Next, the Response Surface Methodology (RSM) was used to predict the response of different combinations of LR and EBS in terms of low and high temperature properties and cost, to then be optimised targeting conventional and rheological properties of PMBs currently used in asphalt mixtures and roofing membranes in UK. As a result, an optimum combination of LR and EBS was found leading to a cost-effective modified bitumen comparable to PMBs. The work provided also analytical functions that could be of use in further design exercises.

yearjournalcountryeditionlanguage
2020-07-01Construction and Building Materials
https://doi.org/10.1016/j.conbuildmat.2020.118630