Effects of pre-treatment using waste quarry dust on the adherence of recycled tyre rubber particles to cementitious paste in rubberised concrete. (10th September 2020)

• Record Type: Journal Article
• Authors: Polydorou, Thomaida; Constantinides, Georgios; Neocleous, Kyriacos; Kyriakides, Nicholas; Koutsokeras, Loukas; Chrysostomou, Christis; Hadjimitsis, Diofantos
• Is Part Of: Construction & building materials. Volume 254(2020)
• Publication Date: 2020-09-10
• Subjects: Rubberised concrete -- Hydrophobicity -- Rubber pre-treatment -- Waste quarry dust -- Interfacial Transition Zone; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.119325
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The weak interface and main drawback of rubberised concrete remains unresolved. A novel technique that improves the adhesion of rubber to cement paste is presented. The method eliminates the hydrophobicity of rubber, allowing better mixing action. SEM images reveal notable reduction of air voids at the rubber-cement paste interface. Compressive strength increase of over 270% is achieved for the selected mixture. Abstract: This research is focused on improving the mechanical response of rubberised concrete, with the objective of enhancing its weak Interfacial Transition Zone (ITZ). Pre-treatment of recycled tyre rubber particles by another material that is otherwise considered as waste, Waste Quarry Dust (WQD), diminished the hydrophobicity of rubber and subsequently eliminated excessive fluid repelling during mixing, key in reducing the gaps observed at the interface via SEM imaging. The pre-treatment consequently allowed for improved compressive strength; results indicate an increase of 282% and 276% in the 7 and 28-day compressive strength, respectively, for the selected rubberised concrete mixture.