Durability of Reinforced Concrete Beams under Simultaneous Flexural Load in Corrosive Environment

Karavokyros, Loukas; Batis, G.; Katsiotis, N.S.; Tzanis, Emmanouil; Beazi-Katsioti, Margarita

doi:10.4236/msce.2020.84003

Cited by 2 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a reminder, the tests which make it possible to study the behaviour of the steel-concrete interface are: The pull-out type test or pull-out test, the push-in type test and the double tie rod [55].…”

Section: The Investigation Of the Behaviour Of The Interface Presente...mentioning

confidence: 99%

The Effects of Degradation Phenomena of the Steel-Concrete Interface in Reinforced Concrete Structures

Karka¹,

Bruno²,

Ngarmaïm³

et al. 2023

MSCE

View full text Add to dashboard Cite

Reinforced concrete (RC) constructions are the innovation of sustainable constructions replacing masonry constructions. Despite this, the use of concrete and steel to improve the performance of structural members in service is a recurring problem due to the immediate or overtime appearance of cracks. The objective of this work was therefore to assess the damage phenomena of the steel-concrete interface in order to assess the performance of an RC structure. Samples of approximately 30 cm of reinforcement attacked by rust were taken from broken reinforced concrete columns and beams in order to determine the impact of corrosion on high adhesion steel (HA) and therefore on its ability to resist. The experimental results have shown that the corrosion degradation rates of reinforcing bars of different diameters increase as the diameter of the reinforcing bars decreases: 5% for HA12; 23.75% for HA8 and 50% for HA6. Using the approach proposed by Mangat and Elgalf on the bearing capacity as a function of the progress of the corrosion phenomenon, these rates made it possible to assess the new fracture limits of corroded HA steels. For HA6 respectively HA8 and HA12, their initial limit resistances will decrease by 4/4, 3/4 and 1/4. Based on the results of this study and in order to guarantee their durability, an RC structure can be dimensioned by taking into account the effects of reinforcement corrosion.

show abstract

Section: The Investigation Of the Behaviour Of The Interface Presente...mentioning

confidence: 99%

The Effects of Degradation Phenomena of the Steel-Concrete Interface in Reinforced Concrete Structures

Karka¹,

Bruno²,

Ngarmaïm³

et al. 2023

MSCE

View full text Add to dashboard Cite

show abstract

The simultaneous impact of corrosion and the reinforcement ratio on the load-bearing capacity of reinforced concrete under axial compression

Mikerego

Lionel

2022

Vestnik MGSU

View full text Add to dashboard Cite

Introduction. This study presents the results of an experimental assessment of the simultaneous impact of corrosion and the reinforcement ratio on the load-bearing capacity of standard reinforced concrete elements subjected to axial compression. Materials and methods. This study was conducted using 216 experimental specimens made of ordinary concrete longitudinally reinforced by high bond reinforcing steel FeE400. The cross-sectional dimension of our experimental reinforced concrete specimens was 20 × 20 cm, and their height was 32 cm. Six cases of bond strength degradation were considered in percent: 0, 20, 40, 60, 80 and 100 %. Experimental specimens had four diameters (Ø). Reinforcing steel rods had the following diameters: Ø10, Ø12, Ø14 and Ø16. For each bond degradation strength value, nine specimens were made using 4Ø10, 4Ø12, 4Ø14 and 4Ø16 rods. The longitudinal steel reinforcement had the reinforcement ratio of 0.80, 1.13, 1.54 and 2.01 %. Bond strength degradation was simulated by applying adhesive tape to the contour surface of the steel rods to prevent the adhesion between the reinforcement and the concrete, in compliance with the required extent of bond strength degradation. The experimental reinforced concrete specimens were subjected to axial compression 28 days later. The collapsing forces, thus obtained, were transformed in compressive strength for the purpose of analysis and interpretation of the results. Results. For one and the same reinforcement ratio, the loss of the load-bearing capacity of reinforced concrete increases, as bond strength degradation goes up. For the same bond strength degradation, the loss of the load-bearing capacity of reinforced concrete also increases, if the reinforcement ratio goes up. Bond strength degradation from 0 to 100 % leads to the load-bearing capacity loss to 11.62, 16.52, 21.32, 26.26 % respectively for the reinforcement ratio μ of 0.80, 1.13, 1.54 and 2.01 %. The curves, demonstrating the load-bearing capacity loss by the reinforced concrete subjected to axial compression, are presented as functions that depend on bond strength degradation and the reinforcement ratio. Conclusions. Bond strength degradation from 0 to 100 % leads to the load-bearing capacity in the range of 11.62 to 26.26 % for the reinforcement ratios between 0.80 and 2.01 %, respectively. The load-bearing capacity loss by reinforced concrete elements subjected to axial compression is presented as the function depending simultaneously on bond strength degradation and the reinforcement ratio. Evidently, excessive reinforcement will negatively affect the durability of the reinforced concrete element under axial compression. Over-reinforced concrete elements under axial compression will be less durable compared to normally reinforced ones.

show abstract

Durability of Reinforced Concrete Beams under Simultaneous Flexural Load in Corrosive Environment

Cited by 2 publications

References 25 publications

The Effects of Degradation Phenomena of the Steel-Concrete Interface in Reinforced Concrete Structures

The Effects of Degradation Phenomena of the Steel-Concrete Interface in Reinforced Concrete Structures

The simultaneous impact of corrosion and the reinforcement ratio on the load-bearing capacity of reinforced concrete under axial compression

Contact Info

Product

Resources

About