scholarly journals Avaliação da vida útil de elementos de concreto armado a partir de medições de íons cloretos existentes na atmosfera marinha da região metropolitana do Recife e através de modelos numéricos computacionais / Evaluation of the service life of reinforced concrete elements from measurements of chloride ions in the marine atmosphere of the metropolitan region of Recife and through numerical computer models

2021 ◽  
Vol 7 (11) ◽  
pp. 105411-105420
Author(s):  
Inêz Prazeres Virgínio ◽  
Fuad Carlos Zarzar Junior
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Computer Models ◽  
Chloride Ions ◽  
Metropolitan Region ◽  
Marine Atmosphere ◽  
Numerical Computer ◽  
Concrete Elements

scholarly journals A review on performance – based specification of durable concrete

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Elson John ◽  
Goldy Prince ◽  
Jessymol George
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Service Life ◽  
Low Cost ◽  
General Assumption ◽  
Chloride Ions ◽  
Actual Structure ◽  
Strength Performance ◽  
Rc Structures ◽  
Performance Specification

Concrete is the most common and widely used building material because of its relatively low cost, flexibility, and adaptability. Recent historical experience indicates that with exposed to aggressive chloride or carbonation-induced conditions, the reinforced concrete (RC) structures deteriorate prior to the expected service life. This is because of the general assumption that the concrete must be sufficiently durable if the strength requirements are adequate. The variability of concrete arising from the actual concreting procedures, such as placement, consolidation, finishing, and curing, does not take this assumption into account. In other words, the concrete cast for compressive strength in the specimens shows no similarity to the concrete in the actual structure. This paper provides a thorough analysis of the advancements that are taking place to achieve the long-term reliability of RC structures based on performance specifications. Keywords: reinforced concrete, service life, compressive strength, performance specification, durability, carbonation, chloride ions

Effect of the ITZ Damage on Durability of Reinforced Concrete in Chloride Environment

1994 ◽  
Vol 370 ◽  
Author(s):  
Raoul François ◽  
Ginette Arliguie
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Concrete Structures ◽  
Operating Conditions ◽  
Reinforced Concrete Structures ◽  
Actual Operating ◽  
Chloride Environment ◽  
Concrete Elements ◽  
Transfer Properties ◽  
Salt Fog

AbstractThis paper deals with the effect of the ITZ on the service life of reinforced concrete. In the case of reinforced concrete structures, the penetration of chlorides does not depend only on concrete transfer properties but also on the loading applied, on the state of strains and on the exposure to the aggressive environment.In order to take into account these different parameters, we have performed experiments on reinforced concrete elements, over a long period. The samples used have to be of an adequate size (3 meters long) and stored in a salt fog in a loading state so as to be representative of the actual operating conditions of the reinforced concrete structures.The bending of the beams leads to the development of cracks which are neither preceded nor accompanied by microcracks, but the cement paste-aggregate interfaces are damaged in the tensile areas.The service loading of reinforced concrete has two consequences : firstly, a cracking with widths ranging between 0.05 mm and 0.5 mm according to the intensity of the mechanical strength applied. Secondly, a damage of the ITZ in the tensile areas causing an increase of chloride penetration directly proportional to the intensity of the stress applied to the beam.The model of the development of corrosion, worked out in relation with time and based on our results, emphasizes the influence of the paste-aggregate interface damage on the duration of the service life.

Corrosion Risk of Patch Repaired Reinforced Concrete Elements Under Influence of Internal Chloride Ions

2017 ◽  
pp. 2101-2108
Author(s):  
Rohaya Abdul Malek ◽  
Atsushi Hattori ◽  
Hirotaka Kawano
Keyword(s):  
Reinforced Concrete ◽  
Chloride Ions ◽  
Corrosion Risk ◽  
Concrete Elements

scholarly journals Service life of hydraulic structure reinforced concrete elements according to protective layer carbonization criteria

2019 ◽  
Vol 1425 ◽  
pp. 012015 ◽  
Author(s):  
A A Yangiev ◽  
M R Bakiev ◽  
O A Muratov ◽  
J M Choriev ◽  
Sh Djabbarova
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Hydraulic Structure ◽  
Protective Layer ◽  
Concrete Elements

SETTING A DIAGRAM APPROACH TO CALCULATING VIBRATED, CENTRIFUGED AND VIBROCENTRIFUGED REINFORCED CONCRETE COLUMNS WITH A VARIATROPIC STRUCTURE

2020 ◽  
pp. 22-34
Author(s):  
Л. Р. Маилян ◽  
С. А. Стельмах ◽  
Е. М. Щербань ◽  
М. П. Нажуев
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
The Cross ◽  
Concrete Elements ◽  
Diagram Approach

Состояние проблемы. Железобетонные элементы изготавливаются, как правило, по трем основным технологиям - вибрированием, центрифугированием и виброцентрифугированием. Однако все основные расчетные зависимости для определения их несущей способности выведены, исходя из основного постулата - постоянства и равенства характеристик бетона по сечению, что реализуется лишь в вибрированных колоннах. Результаты. В рамках диаграммного подхода предложены итерационный, приближенный и упрощенный способы расчета несущей способности железобетонных вибрированных, центрифугированных и виброцентрифугированных колонн. Выводы. Расчет по диаграммному подходу показал существенно более подходящую сходимость с опытными данными, чем расчет по методике норм, а также дал лучшие результаты при использовании дифференциальных характеристик бетона, чем при использовании интегральных и, тем более, нормативных характеристик бетона. Statement of the problem. Reinforced concrete elements are typically manufactured according to three basic technologies - vibration, centrifugation and vibrocentrifugation. However, all the basic calculated dependencies for determining their bearing capacity were derived using the main postulate, i.e., the constancy and equality of the characteristics of concrete over the cross section, which is implemented only in vibrated columns. Results. Within the framework of the diagrammatic approach, iterative, approximate and simplified methods of calculating the bearing capacity of reinforced concrete vibrated, centrifuged and vibrocentrifuged columns are proposed. Conclusions. The calculation according to the diagrammatic approach showed a significantly better convergence with the experimental data than that using the method of norms, and also performs better when using differential characteristics of concrete than when employing integral and particularly standard characteristics of concrete.

scholarly journals The procedure of fire-resistance calculation for compressed reinforced concrete elements

2020 ◽  
Vol 1001 ◽  
pp. 012074
Author(s):  
Dmitry Korolchenko ◽  
Evgenii Artem’ev
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
Concrete Elements
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