INFLUENCE OF ACCELERATED AGEING ON PULL-OFF STRENGTH OF CONCRETE PRODUCED WITH RECYCLED CONCRETE AGGREGATE AND BLENDED WITH HEMP FIBERS

Slobodan Šupić; Bojan Poletanović; Vlastimir Radonjanin; Mirjana Malešev; Ildiko Merta; Vladan Pantić

doi:10.5937/jaes0-50466

Slobodan Šupić Faculty of technical sciences, University of Novi Sad, Novi Sad, Serbia https://orcid.org/0000-0003-3029-9309
Bojan Poletanović Institute of Building Construction and Technology, Technical University of Vienna, Vienna, Austria https://orcid.org/0000-0002-8550-5600
Vlastimir Radonjanin Faculty of technical sciences, University of Novi Sad, Novi Sad, Serbia https://orcid.org/0000-0002-3081-1766
Mirjana Malešev Faculty of technical sciences, University of Novi Sad, Novi Sad, Serbia https://orcid.org/0000-0002-9340-5220
Ildiko Merta Institute of Building Construction and Technology, Technical University of Vienna, Vienna, Austria https://orcid.org/0000-0002-0751-4480
Vladan Pantić Faculty of technical sciences, University of Novi Sad, Novi Sad, Serbia https://orcid.org/0000-0002-3482-9437

DOI: https://doi.org/10.5937/jaes0-50466

Keywords: environmentally friendly products, recycled concrete aggregate, hemp fibers, pull off strength

Abstract

As a result of rising demand for non-renewable resources, high energy consumption, and, most importantly, unfavourable environmental consequences, the construction sector is switching to environmentally friendly products. Some feasible options for developing alternative low-cost, renewable and green materials include the utilization of natural fibers and recycled materials from construction and demolition (C&D) waste. This report summarizes a portion of the experimental research being conducted as part of a bilateral research project: ''BIO-based cementitious composites with recycled aggregates (Bio-gates),'' performed by teams from Novi Sad's Faculty of Technical Sciences and Vienna's Technical University. This research explores the impact of hemp fibers and recycled concrete aggregate (RCA) on the pull off strength of concrete, cured under normal conditions and subjected to wet/dry cycles (accelerated ageing regime). The obtained results revealed that RCA has no detrimental effect on the adhesive bond, while hemp fibers reduce the pull off strength of concrete to a greater extent. Nonetheless, adhesion to the substrate may be regarded satisfactory for all tested concrete types when the limit values specified in the applicable regulations are taken into account.

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