A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Importance of Concrete Mesoscale Structure on Bond-Slip Behavior of Externally Bonded CFRP Strips
Currently, the effect of the concrete substrate on the load-bearing capacity of externally bonded carbon fiber-reinforced polymer (CFRP) strips is determined in the guidelines solely on the basis of the concrete strength. In addition to strength, surface preparations can improve the bond resistance by exposing the aggregates of the substrate. However, the interlocking also depends on the parameters that derive from the inner concrete structure such as the aggregate grain dimension and shape, as well as the air void distribution. Therefore, the influence of the concrete inner structure on the bond is investigated with double shear tests by comparing specimens with equivalent concrete strength and varying grain shape and dimension. Bond parameters are calculated using a novel procedure based on optical measurements. Furthermore, crack paths are analyzed by means of computed tomography (CT) scans, which prove to be an essential inspecting technique for characterizing the inner concrete structure. The fracture energy is approximately 30% higher for concrete with a maximum grain size of 8 mm compared to an equivalent mortar with 4 mm maximum grain size.
Importance of Concrete Mesoscale Structure on Bond-Slip Behavior of Externally Bonded CFRP Strips
Currently, the effect of the concrete substrate on the load-bearing capacity of externally bonded carbon fiber-reinforced polymer (CFRP) strips is determined in the guidelines solely on the basis of the concrete strength. In addition to strength, surface preparations can improve the bond resistance by exposing the aggregates of the substrate. However, the interlocking also depends on the parameters that derive from the inner concrete structure such as the aggregate grain dimension and shape, as well as the air void distribution. Therefore, the influence of the concrete inner structure on the bond is investigated with double shear tests by comparing specimens with equivalent concrete strength and varying grain shape and dimension. Bond parameters are calculated using a novel procedure based on optical measurements. Furthermore, crack paths are analyzed by means of computed tomography (CT) scans, which prove to be an essential inspecting technique for characterizing the inner concrete structure. The fracture energy is approximately 30% higher for concrete with a maximum grain size of 8 mm compared to an equivalent mortar with 4 mm maximum grain size.
Importance of Concrete Mesoscale Structure on Bond-Slip Behavior of Externally Bonded CFRP Strips
J. Compos. Constr.
Lunardelli, Matteo (author) / Leusmann, Thorsten (author) / Lowke, Dirk (author)
2022-10-01
Article (Journal)
Electronic Resource
English
Bond slip behavior of anchored CFRP strips on concrete surfaces
| British Library Online Contents | 2016
Bond slip behavior of anchored CFRP strips on concrete surfaces
| Online Contents | 2016
Bond slip behavior of anchored CFRP strips on concrete surfaces
| British Library Online Contents | 2016
Bond slip behavior of anchored CFRP strips on concrete surfaces
| British Library Online Contents | 2016