Steady-state polarization response of chloride-induced macrocell corrosion systems in steel reinforced concrete — numerical and experimental investigations

Based on strut-and-tie model (STM) in deep beams, steel truss reinforced concrete (STRC) deep beam was developed. Experimental investigations of mechanical performances of STRC deep beams were carried out, and results show that STRC deep beam is of high ultimate bearing capacity, large rigidity and good ductility; Strut-and-tie force transference model is formed in STRC deep beams, and loads can be transferred in the shortest and direct way. Then Steel reinforced concrete (SRC) strut-and-tie model (SSTM) for determining the shear strength of STRC deep beams is proposed. The contribution of SRC diagonal strut, longitudinal reinforcements, stirrups and web reinforcements to the shear strength of STRC deep beams are determined with consideration of softened effects of concrete, and for safe consideration, superposition theory is employed for SRC struts. Computer programs are developed to calculate the shear strength of STRC deep beams and verified by experimental results.

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Leaching of Carbon Reinforced Concrete—Part 1: Experimental Investigations

Materials ◽

10.3390/ma13194405 ◽

2020 ◽

Vol 13 (19) ◽

pp. 4405

Author(s):

Lia Weiler ◽

Anya Vollpracht

Keyword(s):

Heavy Metal ◽

Reinforced Concrete ◽

Laboratory Experiments ◽

Outdoor Exposure ◽

Experimental Investigations ◽

Background Concentrations ◽

Steel Reinforced Concrete ◽

Zinc Concentrations ◽

High Concentrations ◽

Outdoor Behavior

The composite material ‘carbon concrete composite (C3)’ is currently capturing the building sector as an ‘innovative’ and ‘sustainable’ alternative to steel reinforced concrete. In this work, its environmental compatibility was investigated. The focus of this research was the leaching behavior of C3, especially for the application as irrigated façade elements. Laboratory and outdoor exposure tests were run to determine and assess the heavy metal and trace element emissions. In the wake of this work, the validity of laboratory experiments and the transferability to outdoor behavior were investigated. The experimental results show very low releases of environmental harmful substances from carbon concrete composite. Most heavy metal concentrations were in the range of <0.1–8 µg/L, and higher concentrations (up to 32 µg/L) were found for barium, chromium, and copper. Vanadium and zinc concentrations were in the range of 0.1–60 µg/L, boron and nickel concentrations were clearly exceeding 100 µg/L. Most of the high concentrations were found to be a result of the rainfall background concentrations. The material C3 is therefore considered to be environmentally friendly. There is no general correlation between laboratory leaching data and outdoor emissions. The results depend on the examined substance and used method. The prediction and evaluation of the leaching of building elements submitted to rain is therefore challenging. This topic is debated in the second part of this publication.

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Experimental Investigation on Behavior of Slender Steel Reinforced Concrete Columns Subjected to Eccentric Load

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.256-259.697 ◽

2012 ◽

Vol 256-259 ◽

pp. 697-701

Author(s):

Zhuo Han ◽

Shao Fei Jiang ◽

Zhi Ping Sun ◽

Le Zhou

Keyword(s):

Reinforced Concrete ◽

Failure Modes ◽

Slenderness Ratio ◽

Concrete Strength ◽

Axial Loading ◽

Experimental Investigations ◽

Eccentric Load ◽

Composite Columns ◽

Steel Reinforced Concrete ◽

Steel Shape

The objectives of this research were to investigate the structural behavior of slender steel reinforced concrete (Referred to as SRC)composite columns subjected to eccentric axial loading. The test consisted of 10 slender columns, with rectangular section160×180mm, and steel shape I10 encased in concrete. The stirrup spacing was 150 mm; its diameter was 6 mm. The diameter of longitudinal reinforcing bars was 10 mm. Details of the experimental investigations including description of the test columns, failure modes and mechanisms, strain characteristics, and load-deformation responses are discussed. Effects of concrete strength, slenderness of columns, and eccentricity of axial loads on the load-carrying capacity of slender column are then presented. Based on these results, a range of slenderness ratio and eccentric ratio of slender SRC column is proposed.

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Numerical and Experimental Investigations on the Behavior of Steel-reinforced Concrete Columns Subjected to Eccentric Loading

International Journal of Engineering ◽

10.5829/ije.2020.33.08b.11 ◽

2020 ◽

Vol 33 (8) ◽

Keyword(s):

Reinforced Concrete ◽

Concrete Columns ◽

Experimental Investigations ◽

Reinforced Concrete Columns ◽

Steel Reinforced Concrete

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The mathematical modelling of corrosion in hot dip galvanized steel reinforced concrete

International Review of Applied Sciences and Engineering ◽

10.1556/irase.2.2011.1.1 ◽

2011 ◽

Vol 2 (1) ◽

pp. 1-12

Author(s):

A. Hegyi ◽

H. Vermeşan ◽

V. Rus

Keyword(s):

Mathematical Model ◽

Reinforced Concrete ◽

Numerical Model ◽

Equation System ◽

Galvanized Steel ◽

Steel Reinforced Concrete ◽

Numeric Model ◽

Physical And Mathematical Models ◽

Physical Phenomena ◽

The Mathematical Model

Abstract In this paper we wish to present the numerical model elaborated in order to simulate some physical phenomena that influence the general deterioration of steel, whether hot dip galvanized or not, in reinforced concrete. We describe the physical and mathematical models, establishing the corresponding equation system, the initial and boundary conditions. We have also presented the numeric model associated to the mathematical model and the numeric methods of discretization and solution of the differential equations system that describes the mathematical model.

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