Experimental and Numerical Investigation of Textile Reinforced Mortars for strengthening reinforced concrete beams at ambient and elevated temperatures

Revanna, Naveen (2023) Experimental and Numerical Investigation of Textile Reinforced Mortars for strengthening reinforced concrete beams at ambient and elevated temperatures. PhD thesis, University of Liverpool.

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Abstract

Textile reinforced mortars (TRM) are cementitious composites used to strengthen reinforced concrete members, masonry structures and bridges. TRM composites have excellent prospects as strengthening materials as different types of textile fibres can be utilised to reinforce the cementitious matrices. In the last decade or so, there has been a surging interest in TRM with research covering the composite’s behaviour in tension, concrete/masonry-bond, flexure performance of reinforced concrete beams, out-of-plane bending of masonry walls, shear, torsional strengthening of reinforced concrete beams, strengthening masonry and reinforced concrete columns. The present investigation is aimed to evaluate the basic properties of TRM in flexure concrete members at ambient and elevated temperatures as TRMs perform better than FRPs at elevated temperatures. The main purpose of this research was to assess Textile Reinforced Mortars at ambient and elevated temperatures. The current experimental campaign was taken up in two parts. The first part consisted of three sets of experiments. The first set of experiment was on the flexural testing of ambient temperature specimens. The second set of experiment was carried out at elevated temperatures, and a case of transient cum steady state was adopted; that is, the specimens were heated initially followed by a state where the temperature was maintained constant and was subsequently subjected to mechanical loading till failure. Like the ambient temperature case, in addition, a set of temperature ranges was chosen to carry out specimen testing. The third set and the last experimental programme were carried out on specimens subjected to prior heat treatment, allowed to cool down and later, the specimens were tested till failure at 2000C, 4000C and 6000C. The second part of the study is devoted to numerical modelling of the experimental findings from part one. A calibrated Concrete Damaged Plasticity (CDP) model was adopted to model existing experimental data from the literature. The same modelling technique was applied to the laboratory and obtained experimental results to validate the experimental outcomes. Finally, a simple parametric study was carried out. The numerical model and the modelling technique showed potential for future analysis of similar specimens.

Item Type:	Thesis (PhD)
Uncontrolled Keywords:	Textile Reinforced Mortars, FRP, ambient and elevated temperatures, parametric study
Divisions:	Faculty of Science and Engineering > School of Engineering
Depositing User:	Symplectic Admin
Date Deposited:	31 Jan 2024 09:06
Last Modified:	31 Jan 2024 09:07
DOI:	10.17638/03172331
Supervisors:	Loo Chin Moy, Charles Krevaikas, Theofanis Jones, Steve
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3172331