Relations between Surface Roughness Indexes and Bond Strength between CFRP Sheets and Concrete.

Mitsui, Masakazu; Fukuzawa, Kimio; Numao, Tatsuya; Fuda, Ikuo

doi:10.2472/jsms.49.685

Cited by 6 publications

(2 citation statements)

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“…They evaluated the surface roughness index of concrete by changing the treatment methods, which were sandpaper polishing, disk sander grinding, sandblasting and chipping. They observed the three‐dimensional profile of the concrete surface, using an optical displacement meter, and obtained measurements of the maximum depth, superficial area, form factor and so on33. They concluded that the methods of sandblasting and chipping could lead to higher bond strength.…”

Section: Review On the Fundamental Bond Properties Of Frp Sheet‐conmentioning

confidence: 99%

Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

Ueda¹,

Dai²

2004

Progress Structural Eng Maths

120

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SUMMARYThe success of most of strengthening or retrofitting technologies for concrete structures by using external bonded FRP sheets highly depends on the interface bond between FRP sheets and concrete substrates. This paper reviews current studies on evaluating the bond properties of FRP sheet-concrete interfaces, and in particular, focuses on several newly developed bond models for describing the bond characteristics of FRP sheet-concrete interfaces under various loading conditions. This paper also gives several examples that apply those interfacial bond models to the design of different retrofitting cases. Analytical solutions are discussed that consider the local interfacial delamination and slip behaviour, which can improve the prediction of strength and deformation performances, as well as clarify the failure mechanisms of concrete members upgraded with FRP composites. Moreover, the improvement in structural performances of retrofitted concrete members is discussed by relating them to the optimum microscopic properties of the interface bond and the properties of retrofitting materials.

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Section: Review On the Fundamental Bond Properties Of Frp Sheet‐conmentioning

confidence: 99%

Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

Ueda¹,

Dai²

2004

Progress Structural Eng Maths

120

View full text Add to dashboard Cite

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“…There are some studies (Toutanji and Ortiz, 2001;Mitsui et al, 2000;Matana et al, 2005;Myers et al, 2007;Li and Ghebreyesus, 2006;Seo et al, 2012;Yuan et al, 2012;Chen and El-Hacha, 2013) regarding effect of surface preparation in application of FRP where the results of these studies signify that preparation of surfaces by means of water pressure and sandblasting techniques are best methods for creating efficient adhesion For FRP on bedding concrete. It should be noticed that the features of the used adhesive also impact on adhesion resistance of FRP sheets on concrete.…”

Section: Introductionmentioning

confidence: 99%

The analysis of efficiency of GFRP and CFRP covers to reinforce concrete beams under various conditions

Khamesi

2016

Int. j. adv. appl. sci

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Application of Fibre Reinforced Plastic (FRP) composites has been very widely developed for seismic reclamation during recent years. One of the important reasons that may be implied for selection of these materials is the high tensile strength, low-weight, and also flexibility of the system in these materials and very high durability of them. Rather than describing of installation technique of recent studies, it has been dealt with bending-shear behavior in the reinforced concrete beams with Glass-Fibre Reinforced Plastic (GFRP) and Carbon Fibre Reinforced Plastic (CFRP) composites. For this purpose, the concrete reinforced beams have been analyzed by various techniques and using built-in glass and carbon fibers. The carbon-fiber built samples without the end brace and other samples with end-brace were anchored by glass fibers. Similarly, glass-fiber reinforced plastic (GFRP) beams were built with and without bracing at end and reserved under laboratory conditions. These fibers have been installed in tensile point of beams and by means of epoxy adhesive and also one sample was built as control beam without using fibre. On the other hand, some solid and hollow beams were prepared as well. The results of experiments indicate that rates of rising strength for non-bracing carbon and glass were about 19-40% and 8-43% respectively and the strength were increased for braced carbon and glass 17-75% and 10-82% respectively. In hollow cylindrical column enclosed the compressional strength has increased 66% in one CFRP layer, 96% in two CFRP layers, and 123% in three CFRP layers while application of GFRP has increased compressional strength up to 36% in one GFRP layer, 63% in two GFRP layers, and 105% in three GFRP layers for hollow cylindrical column. In solid cylindrical enclosed by one CFRP layer the compressional strength has increased 71%, 138% in two CFRP layers, and 154% in three CFRP layers while application of one GFRP layer has increased compressional strength 45% and in two layer GFRP layer 79% and in three GFRP layers it has been increased up to 144% for solid cylindrical column. The rate of increase in final resistance at beams reinforced by bending-shear strength is greater than final resistance in other beams.

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An experimental investigation into the bond-slip behaviour between CFRP composite and lightweight concrete

Al-Allaf

Weekes

Augusthus-Nelson

et al. 2016

Construction and Building Materials

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Epoxy bonded fibre reinforced polymer (FRP) composites are widely used for the retrofit of ailing reinforced concrete structures, for both shear and flexure. The behaviour of retrofitted concrete structures is governed by the bond strength and the material characteristics of the epoxy bonded FRP and the concrete. Previous studies show that lightweight concrete (LWC), which uses Pulverised Fuel Ash (Lytag) instead of coarse granite aggregates, has significantly lower tensile strength and aggregate interlock compared to normal weight concrete. Performance of shear retrofitted concrete elements is primarily governed by the aggregate interlock and tensile strength. Thus the study of FRP enhancement techniques in LWC is paramount for limit state design. Many studies have been conducted to understand the bond-slip behaviour between normal weight concrete (NWC) and FRP composites, where the increasing interfacial (shear) and normal stresses with increasing plastic deformation lead to FRP debonding and/or FRP rupture failures. This paper presents the experimental pull-off test results obtained from lightweight concrete prisms with various configurations of epoxy bonded Carbon FRP (CFRP) sheets. The experimental results show that the LWC can successfully be applied in the strengthening of lightweight concrete structures. However, the lightweight concrete prisms failed due to a diagonal crack within the concrete materials. This was due to a lower tensile strength compared 2 to normal weight concrete specimens where peeling or rupture of FRP is the dominant failure mechanism.

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Relations between Surface Roughness Indexes and Bond Strength between CFRP Sheets and Concrete.

Cited by 6 publications

References 0 publications

Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

Interface bond between FRP sheets and concrete substrates: properties, numerical modeling and roles in member behaviour

The analysis of efficiency of GFRP and CFRP covers to reinforce concrete beams under various conditions

An experimental investigation into the bond-slip behaviour between CFRP composite and lightweight concrete

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