Evaluation of the Development of Bond Strength between Two Concrete Layers

Dybeł, Piotr; Wałach, Daniel

doi:10.1088/1757-899x/245/3/032056

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…An interfacial transition zone was formed at the point of contact between the batches of concrete, within which the failure surface of the composite element was found. The bond strength of this type of connection is low and, according to literature data [25], constitutes about 50% of the strength of the monolithic element. The research revealed that the larger the area of the intact first layer surface was, the smaller the bond strength between two layers was (Table 4, Figure 5).…”

Section: Bond Failure Mechanismmentioning

confidence: 74%

Effect of Placement Technology on the Bond Strength Between Two Layers of Self-Compacting Concrete

Dybeł

Kucharska

2020

Materials

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Self-compacting concrete (SCC) should generally be placed continuously, but it is not uncommon for contractors to be forced to use interruptions in concrete works due to delivery delays. The multilayer casting of SCC can cause weak bond conditions in the contact area of subsequent layers. Methods of preventing cold joint or lift line formation for normal concretes are not suitable for self-compacting concretes. This article provides research on the effect of multilayer casting technology on the bond strength between two layers of SCC. Three technological variants of connecting successive layers of SCC mixture on beam elements were analyzed: The free flow of the mixture, dropping the mixture from a greater height, and mechanical disturbance of the first layer. Three delay times were applied: 30, 45, and 60 min between two layers of SCC. In general, the research revealed that, regardless of the multilayer casting variant, the bond strength between two layers decreased as the delay time was extended. The best performance and the lowest drop in bond strength were obtained for samples with a mechanically disturbed first layer, independent of the delay time. This method gave similar results to a reference element made without a break in concreting. It was also demonstrated that current recommendations and standard guidelines for multilayer casting appear to be insufficient for ensuring an adequate bond between layers.

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Section: Bond Failure Mechanismmentioning

confidence: 74%

Effect of Placement Technology on the Bond Strength Between Two Layers of Self-Compacting Concrete

Dybeł

Kucharska

2020

Materials

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“…The results demonstrated that silica fume contact and rough surfaces are the two factors that increase the bond strength. Failure (P. Dybeł et al, 2017) mainly occurs in the concrete when bonding the old and new layers by adding a thin layer of an overlay to the existing concrete.…”

Section: Literature Reviewmentioning

confidence: 99%

Bond Strength Analysis of Repaired Concrete based on Polymerization of Glycoluril Formaldehyde

Pothinathan

Education²,

Muthukannan³

et al. 2021

JER is an international, peer-reviewed journal that publishes f

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Repairing old concrete include the correct choice of material and methodology adopted which may not affect the quality providing monolithic condition for old and new concrete. This study investigates two different parameters such as the impact as well as the optimum usage of new polymer glycoluril-formaldehyde as bonding material. Second one is about to understand the surface preparation for increased bonding strength at the interfacial area of old and new concrete. Five different types of surface textures are used to estimate the bond strength such as plane, lined, waved, grid and chipped. Glycoluril aids as a bonding material in both old and new concrete, and it is introduced at 0%, 1%, 2%, 3%, and 4% into the cement mixture. When the surface preparation creates a rough surface, it helps in repairing the concrete with the help of polymerization of glycoluril formaldehyde which promotes the enhancement of bond strength and slant shear. The bond strength of the specimens was measured by slant shear method in compression as well as tension for a period of 1, 2 and 4 weeks of new concrete. The results indicated that the highest bond strength was achieved in 3 percentage addition of glycoluril and grid patten substrate preparation.

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“…To determine the fracture energy of an interface, methods initially developed for homogenous concrete are used, like the three-point bending sample with a notch [ 26 , 27 ] or the wedge splitting test [ 28 ]. For a quick assessment of the strength properties of an interface, it is convenient to introduce the bond efficiency coefficient

[ 16 , 29 ] which can be calculated as follows:

where:

and

are the strength of the interface and the weaker concrete layer obtained from the same test method, respectively.…”

Section: Introductionmentioning

confidence: 99%

On the Calibration of a Numerical Model for Concrete-to-Concrete Interface

2021

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The study was devoted to the numerical modelling of concrete-to-concrete interfaces. Such an interface can be found in many modern composite structures, so proper characterisation of its behaviour is of great importance. A strategy for calibration of a model based on cohesive finite elements and the elastic-damage traction–separation constitutive law available by default in the Abaqus code was proposed. Moreover, the default interface material model was enhanced with the user-field-variables subroutine to include a real strength envelope for such interfaces. Afterwards, the modelling approach was validated with numerical simulation of the most popular tests for determining the strength characteristics of concrete-to-concrete interfaces: three-point bending beam with a notch, splitting bi-material cubic specimens, and slant-shear tests. The results of own pilot studies were used as well as those reported by other researchers. The performed simulations proved the accuracy of the proposed modelling strategy (the mean ratio of ultimate forces obtained with numerical models and from experiments was equal to 1.01). Furthermore, the presented examples allowed us to better understand the basic test methods for concrete interfaces and the observed mechanisms of failure during them.

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Evaluation of the Development of Bond Strength between Two Concrete Layers

Cited by 14 publications

References 6 publications

Effect of Placement Technology on the Bond Strength Between Two Layers of Self-Compacting Concrete

Effect of Placement Technology on the Bond Strength Between Two Layers of Self-Compacting Concrete

Bond Strength Analysis of Repaired Concrete based on Polymerization of Glycoluril Formaldehyde

On the Calibration of a Numerical Model for Concrete-to-Concrete Interface

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