scholarly journals Ion-triggered calcium hydroxide microcapsules for enhanced corrosion resistance of steel bars

RSC Advances ◽  
2018 ◽  
Vol 8 (69) ◽  
pp. 39536-39544 ◽  
Author(s):  
Zi Liang ◽  
Qian Wang ◽  
Biqin Dong ◽  
Bingyin Jiang ◽  
Feng Xing
Keyword(s):  
Corrosion Resistance ◽  
Calcium Hydroxide ◽  
Steel Bars

By exchanging PF6− of the CPILs with Cl−, Ca(OH)2 can penetrate out of the microcapsule through the formed hydrophilic channels.

scholarly journals Influence of Rust Inhibitor on the Corrosion Resistance of Reinforcement in Cement Paste with Chloride

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 606
Author(s):  
Linchun Zhang ◽  
Ailian Zhang ◽  
Ke Li ◽  
Qian Wang ◽  
Junzhe Liu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Cement Paste ◽  
Photoelectron Spectroscopy ◽  
Electrical Resistance ◽  
Corrosion Properties ◽  
Passivation Film ◽  
Steel Bars ◽  
Assembly Unit ◽  
Chloride Environment ◽  
Rust Inhibitor

The electrical resistance and polarization effect of cement paste containing reinforcement were tested to research the anti-corrosion properties of steel bars in cement paste. Moreover, the microstructure and composition of passivation film and rust on the steel bars were studied. The water–cement ratio of the cement paste in this study was 0.3, with 0.5% NaCl, 1% NaNO2, and 1% Benzotriazole, and an assembly unit of 0.5% NaNO2 + 0.5% Benzotriazole by mass of cement was added to the cement to provide a chloride environment. X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were applied to research the composition of the passivation film and the microstructure of the cement paste, respectively. The results indicated that the samples with the assembly unit of 0.5% NaNO2 + 0.5% Benzotriazole showed the highest electrical resistance and polarization electrical resistance, while the specimens with 1.0% Benzotriazole showed the lowest electrical resistance and polarization electrical resistance. Moreover, the passivation film of steel bars weakened with increasing distance from the surface of the steel bars. Therefore, the corrosion of steel bars becomes more serious with increasing distance. Finally, the influence of the rust inhibitor on the corrosion resistance of steel bars in the specimens decreased in the following order: 0.5% NaNO2 + 0.5% Benzotriazole >1.0% NaNO2>1.0% Benzotriazole.

scholarly journals Research on the Mechanical Strengths and the Following Corrosion Resistance of Inner Steel Bars of RPC with Rice Husk Ash and Waste Fly Ash

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1480
Author(s):  
Lili Cui ◽  
Hui Wang
Keyword(s):  
Corrosion Resistance ◽  
Fly Ash ◽  
Rice Husk ◽  
Electrical Resistance ◽  
Rice Husk Ash ◽  
Time History ◽  
Freeze Thaw ◽  
Steel Bars ◽  
Reactive Powder ◽  
Mechanical Strengths

In this paper, the slump flow and mechanical strengths (compressive and flexural strengths) of the reactive powder concrete (RPC) with rice husk ash (RHA) and waste fly ash (WFA) were investigated. The following corrosion resistance of steel bars-reinforced specimens was researched. The ultrasonic sound, the mass loss rate, the electrical resistance, and the electrical resistance time history curves were determined to reflect the corrosion resistance of steel bars. The influence of NaCl freeze–thaw cycles and dry–wet alternations was considered. Results showed that the addition of RHA and WFA demonstrated a negative effect on the fluidity of fresh RPC. The fluidity of fresh RPC with WFA was lower. Moreover, RHA and WFA could effectively improve the mechanical strengths of hardened RPC, and the enhancing effect of RHA was higher. The increasing dosage of RHA could improve the corrosion resistance of steel bars in RPC when the specimens were exposed to the environment of NaCl freeze–thaw cycles and dry–wet alternations. However, when WFA was added, the effect was the opposite. The steel bars in RPC corroded more seriously when the specimens were exposed to the environment of NaCl dry–wet alternations than the environment of NaCl freeze–thaw cycles.

scholarly journals Corrosion Resistance of a Sand Particle-Modified Enamel Coating Applied to Smooth Steel Bars

Materials ◽  
2014 ◽  
Vol 7 (9) ◽  
pp. 6632-6645 ◽  
Author(s):  
Fujian Tang ◽  
Genda Chen ◽  
Richard Brow ◽  
Michael Koenigstein
Keyword(s):  
Corrosion Resistance ◽  
Enamel Coating ◽  
Sand Particle ◽  
Steel Bars

Corrosion resistance of steel bars in mortar mixtures mixed with organic matter, microbial or other

2019 ◽  
Vol 124 ◽  
pp. 105822 ◽  
Author(s):  
K. Kawaai ◽  
T. Nishida ◽  
A. Saito ◽  
I. Ujike ◽  
S. Fujioka
Keyword(s):  
Corrosion Resistance ◽  
Organic Matter ◽  
Steel Bars

Experimental Study of Bond Stress between Concrete and FRP Rebars

2014 ◽  
Vol 488-489 ◽  
pp. 774-777 ◽  
Author(s):  
Nan Hui Yu ◽  
Ji Jun Fan
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Unsaturated Polyester ◽  
Surface Form ◽  
Bonding Performance ◽  
Pull Out ◽  
Steel Bars ◽  
Polyester Composite ◽  
Corrosion Problem

Owing to the excellent tensile strength and corrosion-resistance of fiber reinforced unsaturated polyester composite, it is expected to solve the corrosion problem of building instead of steel bars in some special occasions. Bonding performance between concrete and FRP rebars was studied by pull-out test,the influences of the surface form, anchorage length and diameter of FRP rebar on bonding strength were discussed in detail.

Effects of Coating/Electroplating on Corrosion Resistance of Steel Bar in Reinforced Concrete

2012 ◽  
Vol 446-449 ◽  
pp. 3176-3179 ◽  
Author(s):  
Qun Zhou ◽  
Zhong He Shui ◽  
Yi De Xiao ◽  
Chang Sheng Xu
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Surface Treatment ◽  
Equivalent Circuit ◽  
Surface Coating ◽  
Corrosion Process ◽  
Steel Bar ◽  
Study Results ◽  
Steel Bars ◽  
Corrosion Of Steel

One of the main reasons for the damage of reinforced concrete is the expansion caused by corrosion of steel bar in concrete. In this paper, the equivalent circuit that inflects corrosion process of steel bars in reinforced concrete was analyzed, with the A.C.Impedance Spectrum method. And the effects of surface treatment of the bars on corrosion resistance of the reinforced concrete were investigated. Study results show that the surface coating (plating) on the built-in reinforcement can effectively prevent corrosion of steel bar, thereby enhancing the durability of concrete structures.

scholarly journals Feasibility of Distributed Fiber Optic Sensor for Corrosion Monitoring of Steel Bars in Reinforced Concrete

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3722 ◽  
Author(s):  
Liang Fan ◽  
Yi Bao ◽  
Genda Chen
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Bond Strength ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Corrosion Monitoring ◽  
Distributed Sensor ◽  
Optic Sensor ◽  
Steel Bars ◽  
Distributed Fiber Optic Sensor

This study investigates the feasibility of distributed fiber optic sensor for corrosion monitoring of steel bars embedded in concrete. Two sensor installation methods are compared: (1) attaching the sensor along the bar and (2) winding the sensor on the bar. For the second method, optical fibers were winded spirally on steel bars with different spacings: 0 mm, 2 mm, 5 mm, and 10 mm. Steel bar pull-out testing was conducted to evaluate the effect of presence of distributed sensor on the bond strength of steel–concrete interface. Electrochemical testing was carried out to assess the influence of the installation methods on the corrosion resistance of the reinforced concrete. Winding the optical fiber on steel bars with a 10-mm spacing does not affect the bond strength and corrosion resistance and allows real-time corrosion monitoring. The distributed sensor data can be used to estimate the corrosion induced steel loss and predict concrete cracking.

scholarly journals Research on the Influence of Carbonation on the Content and State of Chloride Ions and the Following Corrosion Resistance of Steel Bars in Cement Paste

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1071
Author(s):  
Hui Wang ◽  
Ailian Zhang ◽  
Linchun Zhang ◽  
Junzhe Liu ◽  
Yan Han ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Blast Furnace ◽  
Cement Paste ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Slag Powder ◽  
Free Chloride ◽  
Steel Bars ◽  
Furnace Slag

In this paper, the changes of free chloride ion concentration and bound chloride concentration in cement paste with different total and proportion of mineral admixtures under carbonation were studied. Moreover, the following corrosion resistance of steel bars buried in cement paste under carbonation was researched by testing the electrical resistance and alternating current (AC) impedance spectroscopy of reinforced cement paste. Results indicated that fly ash and granulated blast furnace slag powder with the content less than 20% by mass ratio of total binder hindered the solidification of chloride ions in cement-based materials, and blast furnace slag powder with the content higher than 20% promoted the solidification of chloride ions in cement paste. The carbonation effect was able to decrease the amount of solidified chloride ion and increase the amount of free chloride ions leading to accelerating the corrosion of reinforcement. Meanwhile, the blast furnace slag powder with the content higher than 20% could effectively promote the corrosion resistance of steel bars.

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