fib Bulletin 55. Model Code 2010 First complete draft Volume 1

Walraven,; Vliet, Bigaj-van; Balazs,; Cairns,; Cervenka,; Corres,; Cosenza,; Eligehausen,; Falkner,; Fardis,; Foster,; Helland,; Høj,; Horst,; Keuser,; Klein,; Kollegger,; Mancini,; Marti,; Matthews,; Menegotto,; Müller, Martin Anton; Pinto, M.; Prisco, di; Randl,; Rostam,; Sakai,; Schiessl,; Sigrist,; Taerwe,; Ueda,; Wight,; Yamazaki,; Bentz,; Burkart,; Creton,; Curbach,; Demonté,; Dehn,; Ruiz, Fernandez; Gehlen,; Glavind,; Matthys,; Mechtcherine,; Muttoni,; Plizzari,; Reinhardt,; Triantafillou,; Vandewalle,; Vrouwenvelder,

doi:10.35789/fib.bull.0056

Cited by 18 publications

(4 citation statements)

References 0 publications

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“…The fib Model Code 2010 [35] has introduced the reduction in bond strength depending on the surface crack width (hereafter, called the fib model). It suggests the variation of the residual bond strength for a specific range of surface crack width.…”

Section: Comparison Of the Test Results With Fib Modelmentioning

confidence: 99%

Effect of Stirrup on Bond Strength Degradation in Concrete Cracked by Expansion Agent Filled Pipes

2021

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The corrosion of rebars in reinforced concrete structures cracks the concrete, which leads to the degradation of the bond strength between the rebar and concrete. Since bond deterioration can menace structural safety, bond strength evaluation is essential for proper maintenance. In this study, the authors investigated bond strength degradation by conducting pull-out tests on concrete specimens, with induced crack width and stirrups ratio being the principal parameters. An expansion agent-filled pipe (EAFP) simulates cracks due to the volumetric expansion of the corroded rebar. One advantage of this method is that it allows one to focus on the single effect of an induced crack. The pull-out tests on 36 specimens show that stirrups’ confinement significantly influences the bond degradation due to induced cracks. The authors proposed an empirical model for the degradation of bond strength, considering the impact of induced crack width. The result shows that the induced crack by EAFP can quantify the exclusive consequence of corrosion on bonds. Furthermore, the coefficient of variation is 12% for specimens without stirrup from Law et al. For specimen without and with stirrup from Lin et al., the coefficients of variation are 14% and 17%. The proposed model can predict the corroded specimen from the literature with reasonable accuracy.

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Section: Comparison Of the Test Results With Fib Modelmentioning

confidence: 99%

Effect of Stirrup on Bond Strength Degradation in Concrete Cracked by Expansion Agent Filled Pipes

2021

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“…Moreover, it remains difficult to accurately measure free chloride and pH within concrete. In view of the critics regarding the involvement of free chloride in the definition of the threshold level of chloride-induced corrosion, the authors have chosen the expression of total chloride content n th (subscript th refers to threshold), besides as used many times in the literature [23,30,31,[34][35][36][37][38][39].…”

Section: Towards Service Life Predictionmentioning

confidence: 99%

“…Values proposed by Polder [37] are chosen: a log-normal distribution with a mean value equal to 0.5 % of mass of binder and a high coefficient of variation equal to 44 %. This choice is more conservative than the distributions proposed in the DuraCrete project [23] and the fib model code [39].…”

Section: Studied Materialsmentioning

confidence: 99%

Sensitivity analysis of chloride ingress models: Case of concretes immersed in seawater

Pradelle

Thiéry

Baroghel-Bouny³

2017

Construction and Building Materials

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Reinforced concrete structures exposed to a marine environment deteriorate as a result of chloride-induced corrosion of the steel rebars. A wide variety of models to predict chloride ingress in water-saturated concretes have already been developed to understand and predict the underlying transport processes. The majority of these models focus on the initiation period of chloride-induced corrosion in order to predict the service life of reinforced concrete structures. They require information on the concrete properties, the concrete cover thickness, the definition of corrosion initiation, etc. These models combine well-known mechanisms, i.e. diffusion of relevant ions, electrical interactions between ions, and interactions between these ions and the solid matrix. As the mechanisms to consider are well identified, the objective here is to perform a probabilistic analysis of some common models. A general framework is proposed to calculate a reliability service life for reinforced concrete structures under chloride attack in case of continuous immersion in seawater. Then a sensitivity analysis is performed in terms of the most relevant mechanisms and influencing input data. The results point out the crucial role of the concrete cover thickness, the critical chloride content and, to a lesser extent, the effective chloride diffusion coefficient. The difficulty to use the Freundlich isotherm for chloride binding is highlighted; it seems to be due to the non-linearity of the description which is still difficult to control. Highlights• A reliability sensitivity analysis of chloride ingress models is performed.• A framework is proposed to calculate a reliability service life for RC structures.

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“…The relation between compressive and split tensile strength in concrete has been studied extensively over the years, and many data are available in the literature [20,21]. Formulas have been given by various standards to estimate the tensile strength of concrete from its compressive strength [22][23][24]. However, in the case of Carbstone products, the main mechanical property evaluated so far has been the compressive strength, and the relationship between the compressive strength and split tensile strength has not been investigated or established.…”

Section: Introductionmentioning

confidence: 99%

Carbstone Pavers: A Sustainable Solution for the Urban Environment

Kazemi-Kamyab

Nielsen

Mierloo³

et al. 2021

Applied Sciences

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To reduce CO2 emissions from the building industry, one option is to replace cement in specific applications with alternative binders. The Carbstone technology is based on the reaction of calcium- and magnesium-containing minerals with CO2 to form carbonate binders. Mixes of carbon steel slag and stainless-steel slag, with tailored particle size distributions, were compacted with a vibro-press and subsequently carbonated in an autoclave to produce carbonated steel slag pavers. The carbonated materials sequester 100–150 g CO2/kg slag. Compressive and tensile splitting strength of the resulting pavers were determined, and the ratio was found to be comparable to that of concrete. The environmental performance of the Carbstone pavers, with an average tensile splitting strength of 3.6 MPa, was found to be in compliance with Belgian and Dutch leaching limit values for construction materials. In addition, leaching results for a concrete mix made with aggregates of crushed Carbstone pavers (simulating the so-called “second life” of pavers) demonstrate that the pavers can be recycled as aggregates in cement-bound products after their product lifetime.

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fib Bulletin 55. Model Code 2010 First complete draft Volume 1

Cited by 18 publications

References 0 publications

Effect of Stirrup on Bond Strength Degradation in Concrete Cracked by Expansion Agent Filled Pipes

Effect of Stirrup on Bond Strength Degradation in Concrete Cracked by Expansion Agent Filled Pipes

Sensitivity analysis of chloride ingress models: Case of concretes immersed in seawater

Carbstone Pavers: A Sustainable Solution for the Urban Environment

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