Effect of surface preparation and bonding agent on the concrete-to-concrete interface strength

Santos, Dinis S.; Santos, Pedro; Dias-da-Costa, D.

doi:10.1016/j.conbuildmat.2012.07.028

Cited by 127 publications

(46 citation statements)

References 9 publications

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“…In the slant shear test, each type of repair mortar was bonded to a substrate concrete sample which has slant plane inclined at 30° angle from vertical axis. It should be noted that before casting the repair materials, the concrete substrates were surface treated by the sandblasting then by dry brushing to ensure a better bond strength [32,33]. The composite samples were 76 mm in diameter and 152 mm in height thus obtained (see Fig.…”

Section: Testing Methodsmentioning

confidence: 99%

Influence of limestone dust and natural pozzolan on engineering properties of self-compacting repair mortars

Ghrici

Choucha

Omran

2018

Frattura Ed Integrità Strutturale

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ABSTRACT. The main goal of this work is to develop self-compacting repair mortars (SCRMs) containing limestone dust (LD) and Natural Pozzolan (NP). Therefore, a three different mortar (SCRM0, SCRM-10LD and SCRM-20NP) were prepared and tested according to EN 1504-3. The results of the experimental study showed that the produced repair materials fulfilled the performances requirements for structural repair products, class R4. In addition, complete composite specimens for the slant shear, showed a good bond strength between the SCRMs and existing substrate concrete (SUBC) at 28-days and the fractures were only occurred in the SUBC, which means that the substrate is the weakest link in the repair system.

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Section: Testing Methodsmentioning

confidence: 99%

Influence of limestone dust and natural pozzolan on engineering properties of self-compacting repair mortars

Ghrici

Choucha

Omran

2018

Frattura Ed Integrità Strutturale

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“…Sci. 2017, 7, 893 3 of 11 splitting tensile [34,46,47,[60][61][62] or bi-surface shear strength [63,64]. Although the sand patch test [14,25] and the profilometric method [44,65] are still popular for evaluating the surface morphology of concrete, Tayeh et al [30], Siewczyńska [66], Hoła et al [67] and Sadowski et al [68] successfully used the 3D laser scanning method to evaluate the interphase zone between the overlay and concrete substrate.…”

Section: Levels Of Examination Of the Interphase Zone Between The Ovementioning

confidence: 99%

Multi-Scale Evaluation of the Interphase Zone between the Overlay and Concrete Substrate: Methods and Descriptors

Sadowski

2017

Applied Sciences

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This article presents the problem of examining the interphase zone between the overlay and concrete substrate at different levels of observation. The possibility of applying available modern research methods in order to examine the interphase zone with regard to the level of observation is presented. These levels were defined in the paper. Examples of tests that show a possible approach to the examination of the interphase zone are also presented.

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“…A range of substrate preparations were examined (no preparation, sand blasting and wire brushing) based on typical methods used in concrete surface preparations for joining concrete sections [10,12,13]. In addition, joint thicknesses of 2, 3 and 4 mm were examined, as these are sizes typically used in industry [24] and shear and tensile tests were undertaken using a combination of standard and non-standard methods (where standard methods do not take jointed concrete into consideration).…”

Section: Structural Mechanics Test Programmementioning

confidence: 99%

“…Moreover, Abu-Tair et al [17] and [18], Bonaldo et al [19], Santos and Julio [11,20] and [13], Tayeh et al [21] and many others with all sorts of splitting, pull off and slant shear tests showed that bond strength is very much dependant on the test method and the results can be very scattered. The failure modes can also change from adhesive failure to cohesive or mixed failure.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the use of various surface preparation techniques in an attempt to improve the bond strength of concrete overlays is common throughout the construction industry, but as bonding agents are introduced, the relationship between surface roughness and bond strength is unclear. Garbacz et al [10], Júlio et al [12] and Santos et al [13] concluded that the application of a bond coat unified the adhesion level, negating the influence of surface roughness especially in cases of bonding hardened concrete to hardened concrete.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical performance of statically loaded flat face epoxy bonded concrete joints

et al. 2018

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One of the main challenges in the offshore renewable energy industry is the reduction in the levelised cost of energy of wind, wave and tidal devices. The use of concrete as the primary construction material in such devices presents a low unit cost, high marine durability alternative to steel, however, to maximise material efficiency factors such as mix constituent design, structural detailing and manufacturing processes have to take into account the specific conditions of the marine environment. Pre-cast segmental construction can be considered as one of the fastest and cheapest construction options. However the challenges regarding performance of epoxy bonded concrete in marine environment should be taken into account. This paper presents the results of an experimental programme on the performance of shear and tensile capacity of flat face concrete joints, focussing on the effect of substrate surface preparation, joint thickness, properties of epoxy resins, exposure to seawater and presence of joint defects on the ultimate failure load. The ultrasonic pulse velocity (UPV) method for detection of defects in the adhesive layer was examined and digital image correlation is used to observe the surface strain flow through the joint. The results indicate that the epoxy joints behave monolithically and remain undamaged under different types of static loading. The joints do not significantly interrupt the flow of strain but can locally affect the distribution of strain (and thus stiffness and stresses) in a structure. An increase in the density of the epoxy (and the filler content) leads to the increase in the joint strength and thicker joints are less affected by small defects in the bonding layer. The majority of tested specimens failed by cracking of concrete rather than by debonding of the joint, whilst compressive stresses acting on the joint can help to augment its shear strength. Sandblasting of bonded surfaces can improve performance of joints, whereas UPV testing may be used for quality control of epoxybonded joints.

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Effect of surface preparation and bonding agent on the concrete-to-concrete interface strength

Cited by 127 publications

References 9 publications

Influence of limestone dust and natural pozzolan on engineering properties of self-compacting repair mortars

Influence of limestone dust and natural pozzolan on engineering properties of self-compacting repair mortars

Multi-Scale Evaluation of the Interphase Zone between the Overlay and Concrete Substrate: Methods and Descriptors

Mechanical performance of statically loaded flat face epoxy bonded concrete joints

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