Corrosion resistance of reinforced concrete based on different cementitious materials

2021 ◽  
Vol 28 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Cementitious Materials

scholarly journals Effect of Plastering Layer on Corrosion Resistances of Reinforced Concrete Beams

2019 ◽  
Vol 9 (1) ◽  
pp. 1390-1393
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Point Load ◽  
Reinforced Concrete Beams ◽  
Experimental Program ◽  
Structural Elements ◽  
Accelerated Corrosion ◽  
Total Mass Loss ◽  
Load Arrangement

Reinforced concrete structures are subjected to deterioration due to many factors such as corrosion of reinforcing steel. Ultimate strengths of structural elements can be greatly affected by these deteriorating factors. There are numerous methods and techniques used to protect these structural elements. The mortar layer (Plastering) is considered the first defense line against all the deteriorating factors. The main goal of this research is to investigate to what extent the plastering layer can protect reinforced concrete beams against corrosion. The aim of the experimental program is to study the effect of plastering layer on corrosion resistance of reinforced concrete beams. Four reinforced concrete beams (1002001100 mms) and four Lollypop specimens (cylinders 100200 mms) were tested and described as follows: • A beam and a lollypop specimen without any plastering layer (control). • A beam and a lollypop specimen with traditional plastering layer (cement + sand + water). • A beam and a lollypop specimen with modified plastering (traditional plastering + waterproof admixtures). • A beam and a lollypop specimen with painted and modified plastering layer (traditional plastering + waterproof admixtures + external waterproof paint). These eight specimens were subjected to corrosion using accelerated corrosion technique, after that the four beams were tested in flexure under three point load arrangement while the four lollypops were used to calculate the total mass loss due to accelerated corrosion. The test results were used to figure out the effect of plastering layer on corrosion resistance of RC beams.

scholarly journals Improving Sustainability through Corrosion Resistance of Reinforced Concrete by Using a Manufactured Blended Cement and Fly Ash

2018 ◽  
Vol 10 (6) ◽  
pp. 2004 ◽  
Author(s):  
Hector Campos Silva ◽  
Pedro Garces Terradillos ◽  
Emilio Zornoza ◽  
Jose Mendoza-Rangel ◽  
Pedro Castro-Borges ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Blended Cement

Chemical Deposition of Thin Layers on Reinforcing Steel

2015 ◽  
Vol 660 ◽  
pp. 213-218 ◽  
Author(s):  
Petru Lazăr ◽  
Costică Bejinariu ◽  
Andrei Victor Sandu ◽  
Alin Marian Cazac ◽  
Ioan Gabriel Sandu
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Experimental Research ◽  
Immersion Time ◽  
Chemical Deposition ◽  
Thin Layers ◽  
Phosphate Solution ◽  
Reinforcing Steel ◽  
Good Surface

This paper presents the results of experimental research on the influence of using microcrystalline phosphating process on the OB37 steel used in construction. For this purpose, the samples were immersed in phosphate solution and the structures were characterized using SEM microscope. The results show that the obtained structures, are influenced by pH and immersion time and show a good surface compactity and roughness, which means that the obtained layer on the OB37 reinforcement improves corrosion resistance and adhesion of these reinforcements in the reinforced concrete.

Repair of Severely Damaged Reinforced Concrete Beams with High-Strength Cementitious Grout

2020 ◽  
Vol 2674 (6) ◽  
pp. 372-384
Author(s):  
Antoine N. Gergess ◽  
Mahfoud Shaikh Al Shabab ◽  
Razane Massouh
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Cementitious Materials ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Rc Structures

High-strength cementitious materials such as high-performance concrete are extensively used for retrofit of reinforced concrete (RC) structures. The effectiveness of these materials is increased when mixed with steel fibers. A commonly used technique for strengthening and repair of RC beams consists of applying high-performance fiber-reinforced concrete jackets around the beam perimeter. This paper investigates the jacketing method for repairing severely damaged RC beams. Four 2 m (6 ft 63/4 in.) long rectangular RC beams, 200 × 300 mm (8 ×12 in.) were initially cast and loaded until failure based on three-point bending tests. The four beams were then repaired by thickening the sides of the damaged RC beams using a commercially available high-strength shrinkage grout with and without steel fibers. Strain and deformation were recorded in the damaged and repaired beams to compare structural performance. It is shown that the flexural strength of the repaired beams is increased and the crack pattern under loading is improved, proving that the proposed repair method can restore the resistance capacity of RC beams despite the degree of damage. A method for repair is proposed and an analytical investigation is also performed to understand the structural behavior of the repaired beams based on different thickening configurations.

Corrosion resistance of steel bar and chloride binding capacity of cementitious materials with internal chloride

2019 ◽  
Vol 139 (3) ◽  
pp. 1903-1914
Author(s):  
Yongmin Yang ◽  
Tongsheng Zhang ◽  
Zhaoheng Li ◽  
Kexin Zhao ◽  
Jiangxiong Wei ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Binding Capacity ◽  
Cementitious Materials ◽  
Chloride Binding ◽  
Steel Bar
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