Bond strength evaluation between textiles reinforced mortar with carbon nanotubes and concrete substrate

Abstract

The influence of using carbon nanotubes to improve bond strength between textiles reinforced mortar and concrete was investigated. Forty-two specimens were tested using double-shear test to evaluate the effect of various parameters such as CNTs addition, type of textile material, bond length and width, and number of TRM layers on the bond behavior. Two types of textile: carbon and basalt fibers were used. Various bond length and width including 50 mm, 100 mm, and 150 mm were considered. Three different percentages of CNTs; 0.05%, 0.1%, and 0.2% by weight of cement, were used. The effect of CNTs addition on the mechanical strength of cement mortar and pull-off strength of TRM were also investigated. Test results showed that adding small amount of CNTs enhanced the tensile and flexural strength of cement mortar, the pull-off strength of the TRM, and the ultimate bond load between the TRM and concrete substrate. The ultimate bond load was highly dependent on the amount of added CNTs, type of textile material, geometry of the bonded area, and number of TRM layers. The SEM images showed the role of the CNTs to enhance the adhesion at the fiber-matrix interface.

Influence of Carbon Nanotubes on Phase Composition, Thermal and Post-Heating Behavior of Cementitious Composites

“…They claimed that CNTs acted as nucleation for the hydration products, which accelerated their crystallization process and thus the overall hydration process. Other studies showed that incorporating CNTs in cementitious composites was an efficient way to improve their mechanical properties [ 8 , 9 , 10 ] such as compressive and flexural strengths [ 11 , 12 , 13 , 14 , 15 ], fracture toughness [ 16 ], and Young modulus [ 4 ]. CNTs improved these properties by bridging the nano-cracks and delaying their propagation to micro level [ 17 ].…”

Targeting functionalised carbon nanotubes at the interphase of Textile Reinforced Mortar (TRM) composites

“…[38,39] and references therein). Within the framework of cementitious materials, Irshidat and Al-Shannaq [40] study the dispersion of CNTs in in the cementitious embedding mortar of textile composites and provide strong evidence as to performance and durability enhancements. In the subsequent paper [12], they present the findings of an experimental program concerning bending of reinforced concrete (RC) beams strengthened with MWCNT-modified TRM laminates.…”