Abstract
In the present work, the effect of various freeze–thaw cycles (namely, 0, 10, 30, 50, 60, and 70) on the residual bond characteristics of textile reinforced mortar (TRM)-to-concrete was experimentally examined. The TRM consisted of a carbon dry fiber textile embedded in a cement-based matrix. Two mortar types were used as the matrix: a normal-weight and a lightweight one sharing the same hydraulic powders but different aggregates (limestone and pumice sand, respectively). The single-lap/single-prism set up was applied after the specimens underwent hygro-thermal treatment (according to ASTM C 666-Procedure B). Failure was due to the sleeve fibers rupturing the load aligned yarns or textile slippage from the mortar for an exposure period ranging between 0 and 60 cycles and to TRM debonding from the substrate for 70 cycles. Increasing cycles resulted in the intensification of partial interlaminar debonding phenomena and the weakening of the textile-to-matrix bond, with lightweight mortar being more prone to these effects. In the absence of a commonly accepted standardized method for the assessment of the freeze–thaw resistance of cement-based composites, the criterion for the termination of the freeze–thaw sequence was the number of cycles inferring a shift in failure mode (from fiber rupture/fiber slippage to TRM debonding from the substrate).
Highlights
Textile reinforced mortar (TRM) is an innovative composite material consisting of inorganic matrices reinforced with fibrous technical grids
The current paper focuses on the effect of freeze–thaw cycles on the bond response of textile reinforced mortar (TRM) systems applied to concrete substrates
All of the textile reinforced normal weight mortar (TRNM) specimens, control textile reinforced lightweight mortar (TRLM) specimens, and TRLM specimens subjected to 10 freeze–thaw cycles failed due fiber rupture
Summary
Textile reinforced mortar (TRM) is an innovative composite material consisting of inorganic matrices reinforced with fibrous technical grids (textiles). The textiles are made of carbon, glass, basalt, aramide, or PBO fibers that are usually arranged in two orthogonal directions; there are hybrid grids with different types of fibers in each direction Regarding the matrix, this can be a cement-, lime-, pozzolana- or geopolymer-based mortar (or any blend thereof), which can be modified with polymeric additives. For all cases, the most decisive parameter governing the effective use of this family of composite materials in strengthening applications is the bond capacity of both the TRM-to-substrate and the textile-to-matrix interfaces ([1,2]). This bond capacity is a function of the long-term performance characteristics of the composite, the TRM-protected substrate, and the interaction between them. An investigation of the effects of various aggressive environments on the bond performance of TRM strengthening systems is of high priority so as to ensure their prolonged and useful life
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