Bond behaviour improvement between infra-lightweight and high strength concretes using FRP grid reinforcements and development of bond strength prediction models

Liu, Yue and Tafsirojjaman, T. ORCID: https://orcid.org/0000-0002-4801-6744 and Dogar, Attiq Ur Rahman and Huckler, Alexander (2020) Bond behaviour improvement between infra-lightweight and high strength concretes using FRP grid reinforcements and development of bond strength prediction models. Construction and Building Materials, 270:121426. pp. 1-15. ISSN 0950-0618

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Abstract

The structural performance of a newly developed lightweight and thermally efficient alternate of normal concrete (NC) i.e. infra-lightweight concrete (ILC) had been under question due to its low elastic modulus, surface roughness, and cracking. In the present study, the structural performance of ILC has been improved by using a layer of high strength concrete (HSC) on each side of the ILC. As the efficiency of the ILC-HSC composite structure depends on the bond between them, therefore, an extensive study has been performed to assess and improve the bond strength in two parts. In the first part, shear (push-out) and tensile (pull-off) bond strength tests have been conducted on ILC-HSC specimens which revealed that the interfacial bond strength is weaker than the weakest material i.e. ILC550. Hence, the bond strength has been improved by carbon and glass fiber-reinforced polymers (CFRPs and GFRPs) with two different grid dimensions i.e. 25 mm and 38 mm in the second part. Test results indicated that both the CFRPs and GFRPs significantly improved the bond strengths and this improvement depends on the reinforcement ratios. Maximum bond strength has been achieved for GFRP-25 reinforced ILCs where shear and tensile bond reinforcement ratios of 0.492% and 0.445% increased the shear and tensile bond strengths by 331% and 456% respectively as compared to un-strengthened specimens. In addition, the comparison of experimental shear bond strengths with five commonly used prediction models revealed the inaccuracy of all the presently available models. Moreover, there is no prediction model available for tensile bond strength prediction. Therefore, two new prediction models have been developed for shear and tensile bond strengths. The comparison of experimental results with developed models has revealed the accuracy and applicability of these models for both the un-strengthened and FRP strengthened ILC-HSC composite structures.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 04 Feb 2021 02:55
Last Modified: 04 Feb 2021 03:17
Uncontrolled Keywords: Infra-lightweight concrete (ILC); High strength concrete (HSC); ILC-HSC composite; shear bond strength; tensile bond strength; FRP grid reinforced ILC-HSC; shear bond strength prediction model; tensile bond strength prediction model
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400510 Structural engineering
40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials
Socio-Economic Objectives (2008): B Economic Development > 87 Construction > 8704 Construction Processes > 870499 Construction Processes not elsewhere classified
B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870302 Metals (e.g. Composites, Coatings, Bonding)
B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Socio-Economic Objectives (2020): 12 CONSTRUCTION > 1203 Construction materials performance and processes > 120301 Cement and concrete materials
12 CONSTRUCTION > 1203 Construction materials performance and processes > 120304 Polymeric materials and paints
12 CONSTRUCTION > 1203 Construction materials performance and processes > 120399 Construction materials performance and processes not elsewhere classified
Funding Details:
Identification Number or DOI: https://doi.org/10.1016/j.conbuildmat.2020.121426
URI: http://eprints.usq.edu.au/id/eprint/40559

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