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

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


Saad M. Raoof

Lampros N. Koutas

Dionysios A. Bournas


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.


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.

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 1359-8368
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 98
Pages 350-361
Keywords Fabrics/textiles; carbon fibre; debonding; mechanical testing; concrete strengthening
Public URL
Publisher URL


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