Bond between textile-reinforced mortar (TRM) and concrete substrates: experimental investigation

Raoof, Saad M.; Koutas, Lampros N.; Bournas, Dionysios A.

Abstract

This paper presents an extended experimental study on the bond behaviour between textile-reinforced mortar (TRM) and concrete substrates. The parameters examined include: (a) the bond length (from 50 mm to 450 mm); (b) the number of TRM layers (from one to four); (c) the concrete surface preparation (grinding versus sandblasting); (d) the concrete compressive strength (15 MPa or 30 MPa); (e) the textile coating; and (f) the anchorage through wrapping with TRM jackets. For this purpose, a total of 80 specimens were fabricated and tested under double-lap direct shear. It is mainly concluded that: (a) after a certain bond length (between 200 mm and 300 mm for any number of layers) the bond strength marginally increases; (b) by increasing the number of layers the bond capacity increases in a non-proportional way, whereas the failure mode is altered; (c) concrete sandblasting is equivalent to grinding in terms of bond capacity and failure mode; (d) concrete compressive strength has a marginal effect on the bond capacity; (e) the use of coated textiles alters the failure mode and significantly increases the bond strength; and (f) anchorage of TRM through wrapping with TRM jackets substantially increases the ultimate load capacity.

Citation

Raoof, S. M., Koutas, L. N., & Bournas, D. A. (2016). Bond between textile-reinforced mortar (TRM) and concrete substrates: experimental investigation. Composites Part B: Engineering, 98, 350-361. https://doi.org/10.1016/j.compositesb.2016.05.041

• Journal Article Type: Article
• Acceptance Date: May 15, 2016
• Online Publication Date: May 17, 2016
• Publication Date: Aug 1, 2016
• Deposit Date: May 18, 2016
• Publicly Available Date: May 18, 2016
• Journal: Composites Part B: Engineering
• Print ISSN: 1359-8368
• Electronic ISSN: 1879-1069
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 98
• Pages: 350-361
• DOI: https://doi.org/10.1016/j.compositesb.2016.05.041
• Keywords: Fabrics/textiles; carbon fibre; debonding; mechanical testing; concrete strengthening
• Public URL: https://nottingham-repository.worktribe.com/output/789786
• Publisher URL: http://dx.doi.org/10.1016/j.compositesb.2016.05.041
• Contract Date: May 18, 2016