The Ultimate Load Design of Continuous Concrete Beams

Beckett, Derrick

doi:10.1007/978-1-4899-6297-3

Cited by 4 publications

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“…In the case of crack pattern, increasing applied loading causes an increase in the depth of the cracks, while the steel rebar between the cracks continues to take the tension. Inadequate bond illustrating by the rebar pull-out results in the formation of much larger cracks, as well as premature failure of the beam [22]. Regarding shells in RC frame, many experimental studies reported that bond-slip phenomenon directly affects the failure displacement and mode of RC slabs [23][24][25][26].…”

Section: Importance Of Steel Rebar-concrete Interface (Rci or Sci) Bondmentioning

confidence: 99%

A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

2020

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Minimum concrete cover for rebar, rebar diameter, concrete compressive strength, embedded length of rebar, and lateral reinforcement by stirrups are the crucial factors considered in existing predicting equations and regulations for predicting rebar-concrete interface (RCI) bond strength. However, considerable effects of concrete composition on RCI are ignored in design codes and investigations. This paper intends to comprehensively highlight the critical aspects of this research gap. Additionally, a practical experimental approach is described in the present study to efficiently consider the effect of the new generations of concrete on RCI bond strength. Finally, nano-concrete is considered as a case study to show the importance of nanoparticle types on RCI bond strength. Overall results show that studying the microstructure of the transition zone at RCI is essential to accompany with the RCI bond strength for considering new generations of concrete in reinforced concrete structures. Additionally, the current study emphasizes that more investigations are necessary to be conducted by future works to fill the existing research gaps in RCI.

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Section: Importance Of Steel Rebar-concrete Interface (Rci or Sci) Bondmentioning

confidence: 99%

A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

2020

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“…4,5 However, corrosion can be initiated due to carbonation or chloride contamination. 6 Carbonation can result in a pH drop ͑to about 8-9͒ 7,8 in the pore solution of the bulk cementitious matrix, leading to a general corrosion of the reinforcing steel. In the event of chloride penetration and chloride arrival at the steel/cement paste interface, localized corrosion is initiated; the local pH can drop to even below 6, resulting in fast corrosion propagation.…”

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confidence: 99%

Corrosion Performance of Carbon Steel in Simulated Pore Solution in the Presence of Micelles

Koleva

Wit

et al. 2011

J. Electrochem. Soc.

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This study presents the results on the investigation of the corrosion behavior of carbon steel in model alkaline medium in the presence of very low concentration of polymeric nanoaggregates ͓0.0024 wt % polyethylene oxide ͑PEO͒ 113 -b-PS 70 micelles͔. The steel electrodes were investigated in chloride-free and chloride-containing cement extracts. The electrochemical measurements ͑electrochemical impedance spectroscopy and potentiodynamic polarization͒ indicate that the presence of micelles alters the composition of the surface layers ͑i.e., micelles were indeed absorbed to the steel surface͒ and influences the electrochemical behavior of the steel, i.e., the micelles lead to an initially increased corrosion resistance of the steel whereas no significant improvement was observed within longer immersion periods. Surface analysis, performed by environmental scanning electronic microscopy, energy-dispersive x-ray analysis, and x-ray photoelectron spectroscopy, supports and elucidates the corrosion performance. The product layers in the micelles-containing specimens are more homogenous and compact, presenting protective ␣-Fe 2 O 3 and/or Fe 3 O 4 , whereas the product layers in the micelles-free specimens exhibit mainly FeOOH, FeO, and FeCO 3 , which are prone to chloride attack. Therefore, the increased "barrier effects" along with the layers composition and altered surface morphology denote for the initially increased corrosion resistance of the steel in chloride-containing alkaline medium in the presence of micelles. A well-known fact is that corrosion of steel reinforcement can cause reinforced concrete deterioration and thus affect civil structures durability.1,2 Logically, corrosion-related issues result in a significant economic loss. For example, in the United States, the annual direct cost of bridge infrastructure corrosion was estimated to be $8.3 billion, and the indirect cost was reported to be many times higher. 3In normal conditions, the reinforcing steel embedded in cementbased materials ͑i.e., cement paste, mortar, and concrete͒ is in a passive state because of the high alkalinity ͑pH = 12.6-13.5͒ of the pore solution and the cement paste, respectively. 4,5 However, corrosion can be initiated due to carbonation or chloride contamination. 6 Carbonation can result in a pH drop ͑to about 8-9͒ 7,8 in the pore solution of the bulk cementitious matrix, leading to a general corrosion of the reinforcing steel. In the event of chloride penetration and chloride arrival at the steel/cement paste interface, localized corrosion is initiated; the local pH can drop to even below 6, resulting in fast corrosion propagation. This will cause accelerated damage of the reinforcing steel and possible rapid failure of reinforced concrete. 9To minimize the corrosion processes, various methods and techniques are used. Among them, the polymer-based organic corrosion inhibitors are widely applied because they can provide an easy handling, cost-effective corrosion prevention, delaying corrosion initiation.10-14 The organic inh...

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An introduction to limit state analysis of reinforced concrete beams and slabs

Beckett¹

1969

Building Science

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The Ultimate Load Design of Continuous Concrete Beams

Cited by 4 publications

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A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

Corrosion Performance of Carbon Steel in Simulated Pore Solution in the Presence of Micelles

An introduction to limit state analysis of reinforced concrete beams and slabs

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