Tensile bond testing of concrete repairs

Austin, Simon A.; Robins, Peter J.; Pan, Youguang

doi:10.1007/bf02473259

Cited by 135 publications

(72 citation statements)

References 4 publications

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“…Bond quality is usually characterized by a fracture stress related to the process of breaking the bond between bodies that are already in contact [7]: another approach considers the process through which two bodies are brought together and attached (bonded) to each other: in this case, the kinetics of contact is of prime importance. Creation of the bond can be explained in terms of specific and mechanical adhesion.…”

Section: Fig1 Factors Affecting Bond Between Concrete Substrate and mentioning

confidence: 99%

Near-to-surface properties affecting bond strength in concrete repair

Courard

Piotrowski

Garbacz

2014

Cement and Concrete Composites

149

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Abstract:One of the main processes for repairing concrete structures is patch repair.Efficiency and durability of a repaired system depends on the bond between concrete substrate and repair material. By increasing the surface roughness, the surface treatment of concrete substrate can promote mechanical interlocking that is one of the basic mechanisms of adhesion. Nevertheless, some problems may arise from "co-lateral" effects of the treatment, especially due to the development of microcracks inside the substrate. In the presented paper, the effect of concrete substrate surface preparation has been characterized by roughness measurement, description of microcracking in the near-to-surface layer and a pull-off cohesion test. After repair, pull-off bond strength has been evaluated. It is concluded that selection of a suitable surface treatment technique should be preceded by the analysis of its aggressiveness in relation to the concrete substrate strength. A procedure for bond strength estimation using multiple regression approach, based on parameters describing surface quality really generated from various roughening techniques, is then proposed.

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Section: Fig1 Factors Affecting Bond Between Concrete Substrate and mentioning

confidence: 99%

Near-to-surface properties affecting bond strength in concrete repair

Courard

Piotrowski

Garbacz

2014

Cement and Concrete Composites

149

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“…Sand-blasting and water-jetting (WJ) are the best surface preparation methods according to several authors (Hindo 1990;Silfwerbrand 1990) and it has been proved that a saturated substrate with a dry surface is considered to be the best solution (Austin et al 1995;Cleand and Long 1997). The concrete substrates surfaces in this study were treated by WJ method.…”

Section: Materials and Specimensmentioning

confidence: 98%

Fatigue Degradation Properties of PCM-concrete Interface

Zhang

Furuuchi

Hori

et al. 2009

ACT

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Stress analysis of RC structures that have been retrofitted by an externally bonded layer of Polymer Cement Mortar (PCM) based materials requires the development of a constitutive model of the PCM-concrete interface under static and fatigue loading. In this paper, the bending fatigue and shear fatigue tests were conducted to determine the interface fatigue degradation properties by using the J-integral method based on the energy equivalence. Substrate concretes with four different compressive strengths and interface roughness were applied to understand the effects of substrate concrete and interface roughness on the fatigue degradation properties. It was found that the failure characteristics of the PCMconcrete interface is similar to those of cementitious material and the failure modes of PCM-concrete interface has an important effect on the interface tensile and shear degradation relation and S-N relation under fatigue loading. The degradation relation is similar in the case that the failure mode is identical, regardless of the type of substrate concrete. The fatigue resistance of the PCM-concrete interface is inferior to that in the concrete cohesion layer.

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“…The substrate mix design was based upon earlier work by Austin et al 28 and each 250x500x50mm substrate was grit-blasted on one side to produce a surface roughness index (SRI) 29 of approximately 220mm. The surface was wetted and left until saturated surface dry prior to spraying.…”

Section: Strengthsmentioning

confidence: 99%