Comparison of methods for evaluating bond strength between concrete substrate and repair materials

Structural performance and durability of ultra high performance concrete could demonstrate optimal performance when unity was kept. Accordingly, it is necessary to involve the characteristics and quantitative surface treatment at the same time in order to retain oneness of Ultra-High-Performance Concrete(UHPC) according to construction joint occurrence. Therefore, this study derives a reasonable surface treatment method in a material's point of view through the shear adhesion performance evaluation according to the construction joints surface processing method as a part for securing the adhesion performance of the construction joints when casting UHPC. 180 MPa of required average strength was used for mix of UHPC and surface treatment method was set to totally 7 level that MN, GR-10-0, GR-20-0, GR-30-0, SH-30-5, SH-30-10. After the specimen were manufactured to a size of 150×150×150mm, Direct shear test was performed to evaluate the shear adhesion strength. As a result, it was confirmed that the adhesion performance was improved when executing a surface treatment for the construction joint interface and standard of failure mode of specimen was over Type C. Also, It was considered that interface of cross section and depth of concavo-convex should be concerned.

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Section: 전단부착강도unclassified

An Experimental Study on the Bonding Shear Performance Evaluation of the UHPC According to an Bonding Interface Treatment of the Construction Joint

장현오¹,

김보석²,

이한승³

2016

Journal of the Korea Institute of Building Construction

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“…In the field of rehabilitation and strengthening the bond strength between the substrate and repair material generally presents a weak bond [12]. A good bond is one of the main requirements for successful repair.…”

Section: Surface Preparationmentioning

confidence: 99%

“…Some researchers normally will investigate and make a comparison between geopolymer mortar and commercial products [8][9][10][11]. Slant shear test is one of the approached method highlighted by the previous researchers in order to evaluate the performances of the repair material [12]. However, bond strength depends not only on the characteristics of the repair material but also on the surface roughness of concrete substrate.…”

Section: Introductionmentioning

confidence: 99%

Review on Potential of Geopolymer for Concrete Repair and Rehabilitation

et al. 2016

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Abstract. Cracking, spalling, surface deterioration, seepage and other concrete damage of the existing infrastructure have raised concern among residents, local authorities and developers. Dealing with concrete infrastructure rehabilitation is an important issue due to most of infrastructures today are concrete based. To simply patch up the spalling concrete as temporary solution and sooner or later, the cracks will return to haunt. This paper reviewed the current research and studies on concrete repair materials, highlighting the properties of geopolymer. It covers geopolymer repair materials which addressed in the field of concrete infrastructure rehabilitation. Geopolymer had good repair characteristics and displays the potential as an excellent repair material.

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“…It is well known that this roughness of joint and the ratio between compressive strength of substrate and repair material affect the performance of jointed members under static loading (Momayez et al 2005;Furuuchi at al. 2006;Zhang at al.…”

Section: Introductionmentioning

confidence: 99%

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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Comparison of methods for evaluating bond strength between concrete substrate and repair materials

Cited by 400 publications

References 1 publication

An Experimental Study on the Bonding Shear Performance Evaluation of the UHPC According to an Bonding Interface Treatment of the Construction Joint

An Experimental Study on the Bonding Shear Performance Evaluation of the UHPC According to an Bonding Interface Treatment of the Construction Joint

Review on Potential of Geopolymer for Concrete Repair and Rehabilitation

Fatigue Degradation Properties of PCM-concrete Interface

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