Instandsetzung von gefugten Betonflächen mit einer dünnen Schicht aus Carbonbeton

Farwig, Kristina; Neumann, Julia; Schneider, Robert J.; Breitenbücher, Rolf; Curbach, Manfred

doi:10.1002/best.202000048

Cited by 5 publications

(8 citation statements)

References 13 publications

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“…Depending on the type of failure, a significant level of strengthening was achieved 15 . Further investigations showed that TRC layers can be realized for strongly exposed components without additional sealing or road surfaces 16,17 …”

Section: Rehabilitation Of Road Surface Using Textile‐reinforced Conc...mentioning

confidence: 99%

Experimental investigation on salt frost scaling of textile‐reinforced concrete

Konzilia

Egger

Feix

2022

Structural Concrete

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With the aim of reducing life cycle costs and dead weight, there are various concepts for replacing bridge pavements and sealants with high‐performance concrete. The corrosion resistance of textile reinforcements allows the realization of thin reinforcement layers that fulfill this objective. However, the textile‐reinforced concrete used as a road surface must meet the particular requirements relating to frost resistance and, specifically, scaling. An investigation on an existing structure indicated the influence of textile reinforcements on frost resistance. Therefore, the present investigations focus on the frost scaling of different combinations of a carbon reinforcement and fine‐grained concrete. For this purpose, a multistage research design is used. First, the influence of the reinforcement and the concrete mix on the capillary porosity is investigated. The capillary porosity of concrete is directly related to its resistance to freeze–thaw scaling. This resistance is examined using the slab‐test method. Finally, the influence of the frost exposure on the pull‐off strength, which is crucial for the strengthening of structures, is determined.

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Section: Rehabilitation Of Road Surface Using Textile‐reinforced Conc...mentioning

confidence: 99%

Experimental investigation on salt frost scaling of textile‐reinforced concrete

Konzilia

Egger

Feix

2022

Structural Concrete

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“…39 The mathematically described and averaged bond stress-slip curve is then used for the calculation of the required anchorage length and to predict the crack widths and spacing for a given load, see Reference [9]. Besides the calculation algorithms presented in Reference [9], other models for the calculation of crack widths are known, for example, as presented in [Reference 40] Since the calculation algorithms from Reference [9] are based on SPO tests, they were used for the research in the presented project and adapted for the special application. By creating an extensive tool using Microsoft Excel software to analyze the data of a high number of specimens, it was possible to define a multilinear bond-slip relation.…”

Section: Bond-slip Relation and Calculation Of Crack Formationmentioning

confidence: 99%

“…In the SPO tests, a correlation between the force and the crack opening is determined which can be converted into a bond stress‐slip relation, using simplified formulas 38 or other numerical methods 39 . The mathematically described and averaged bond stress‐slip curve is then used for the calculation of the required anchorage length and to predict the crack widths and spacing for a given load, see Reference [9]. Besides the calculation algorithms presented in Reference [9], other models for the calculation of crack widths are known, for example, as presented in [Reference 40] Since the calculation algorithms from Reference [9] are based on SPO tests, they were used for the research in the presented project and adapted for the special application.…”

Section: Experimental Investigation Of Crack Developmentmentioning

confidence: 99%

“…In this context, different temperature ranges (À15 C, 20 C, and 60 C) as well as an initial frost attack were taken into account. Subsequently, the results were used to simulate the crack widths and spacing according to the calculation method presented in Reference [9]. The aim of this experimental and analytical process has been to achieve the best possible crack distribution combined with limited crack widths for different stress conditions considering the temperature load of an deck cap.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the crack formation in carbon concrete for the use in deck caps on cantilever slabs of bridges

Farwig

Schulte‐Schrepping

Curbach

et al. 2022

Structural Concrete

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Deck caps of bridges—in Germany shortly known as “bridge caps”—are usually made of steel reinforced concrete to form the anchoring area for the guardrail of bridge deck edges on existing cantilever slabs. Combined with protective devices, the outside arranged deck caps provide safety against lateral breaking or crashes of vehicles. Due to their exposed position in the cross section of bridges and the particularly intensive stresses, the deck caps are considered as wear parts and have to be renewed several times during the service life of a bridge. The decisive factor here is the discrepancy between the frost resistance of the concrete and the crack width restriction. On the one hand, only very small cracks (<0.2 mm) can be accepted to prevent corrosion of the rebars under the strong exposure of these elements. To confine crack widths without applying an excessively high degree of reinforcement, a low concrete compressive strength is advantageous. On the other hand, a sufficient frost resistance requires a correspondingly high compressive strength. With carbon reinforcement, these contrary points could be defused and simultaneously the needed durability could be provided. Therefore, slightly modified deck cap concretes combined with a carbon reinforcement mesh were tested to examine the bond behavior with and without freeze–thaw attack. To prove the characteristics of this combined system, the crack formation and crack distribution were investigated experimentally. The test results were compared to calculated values from a mathematically tool to be able to develop different reinforcement concepts in future that can ensure an optimized crack formation and crack width for deck caps.

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“…Fig 9. Example of the change of the relative dynamicYoung's modulus on beams with cracks considered for the CRC layer; adapted from[20] …”

mentioning

confidence: 99%

Thin Bonded Overlays with Carbon Reinforcement for Concrete Pavements

Neumann

Breitenbücher²

2022

MATEC Web Conf.

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Here a possible alternative joint design in plain concrete pavements was investigated. The basis for this is to cover the concrete pavement with a thin jointless carbon reinforced concrete layer (CRC layer) of 50 to 70 mm as the top concrete. In the process, the classic joints already present in the lower concrete layer are also covered. The carbon reinforcement with a very high load capacity is intended to generate a finely distributed crack pattern in the upper concrete layer, thus preventing the penetration of moisture and other fluids into the joint area. This method thus represents an alternative to conventional joint sealing. Such a construction method is applicable both in the context of repair and new construction measures. In addition to tests on the cracking behaviour of CRC for concrete pavements, the main focus was on tests on large scale composite beams (classic jointed lower concrete + CRC layer). The focus was on the effects of static and cyclic bending on the material behaviour of the CRC over the moving joints in the lower concrete and the bond behaviour of lower and carbon reinforced concrete. The influence of differently designed bond breakers on the crack formation in the joint area was also considered.

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Instandsetzung von gefugten Betonflächen mit einer dünnen Schicht aus Carbonbeton

Cited by 5 publications

References 13 publications

Experimental investigation on salt frost scaling of textile‐reinforced concrete

Experimental investigation on salt frost scaling of textile‐reinforced concrete

Investigation on the crack formation in carbon concrete for the use in deck caps on cantilever slabs of bridges

Thin Bonded Overlays with Carbon Reinforcement for Concrete Pavements

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