A high-performance rubberised alkali-activated mortar for repair of RC beams

Zakeremamreza, Amin and Kianifar, Mohammad E. and Chibuisi, Chidera and Ahmadi, Ehsan and Salami, Mohammad R. (2023) A high-performance rubberised alkali-activated mortar for repair of RC beams. Construction and Building Materials, 400. p. 132610. ISSN 0950-0618

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Abstract

The application of recycled waste tyre rubber in construction materials is increasingly growing due to its economic, environmental, and technical benefits. This study, in particular, examines the potential use of a waste tire rubber alkali-activated mortar in effective repair of damaged RC beams, which contains a very slight embodied-carbon footprint compared to the existing repair mortars. To assess the effectiveness of the proposed mortar for repair purposes, an extensive set of small-scale mortar samples with diverse contents are designed, assembled, and tested for compressive strength, flexural strength, bonding strength, and water absorption capacity. After discovering the efficient mortar mix that in general provides improved performance, large-scale RC beams are designed, constructed, damaged, repaired, and tested in flexure. It is found that the proposed mortar showed remarkable results and potential as a repair material. It contains significantly lower embodied carbon (35.3 kg/m3) compared to ordinary mortar (530.8 kg/m3). Also, the beam repaired by the proposed mortar exhibits high overall performance including strength capacity, ductility index, and bonding feature that are superior to the existing mortars. In particular, the experimental results demonstrated about 20 % increase in cracking load and 30 % increase in maximum displacement compared to the undamaged beam.

Item Type:	Article
Identification Number:	10.1016/j.conbuildmat.2023.132610
Dates:	Date Event 24 July 2023 Accepted 28 July 2023 Published Online
Uncontrolled Keywords:	Waste tire rubber alkali-activated mortar, RC concrete beams, Concrete repair, Flexural strength, Compressive strength, Bonding strength, water absorption
Subjects:	CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-01 - engineering (non-specific)
Divisions:	Faculty of Computing, Engineering and the Built Environment > College of Built Environment
Depositing User:	Gemma Tonks
Date Deposited:	25 Oct 2023 14:47
Last Modified:	20 Jun 2024 11:45
URI:	https://www.open-access.bcu.ac.uk/id/eprint/14870

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