Article
Construction & Building Technology
Fabio Bolzoni, Andrea Brenna, Marco Ormellese
Summary: Rebar corrosion is a critical issue in reinforced concrete structures, and corrosion inhibitors are effective techniques to delay or reduce corrosion. In addition to traditional nitrite-based inhibitors, new organic and inorganic substances, including natural extracts from plants, are being studied as potential corrosion inhibitors to address safety and environmental concerns.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Chenxi Liu, Narasi Sridhar
Summary: Localized corrosion of carbon steel in simulated concrete pore solutions was studied using CPP technique, showing that high OH- and NO2- levels, along with low Cl- levels, can reduce the risk of pitting corrosion. The presence of NO3- was found to be insignificant in this study. Additionally, NO2- and Cl- were identified as the main factors influencing the corrosion rate, while cationic species had minimal impact on electrochemical parameters.
Review
Construction & Building Technology
Jixi Chen, Jinqing Jia, Mengyu Zhu
Summary: Due to the scarcity of fresh water and river sand, many countries are using seawater and sea sand as substitutes for concrete pouring to promote sustainability in the construction industry. However, the high chlorine content in seawater and sea sand can reduce the lifespan of concrete structures. By adding admixtures, this research explores the composition, properties, and mechanisms of chloride ion transport and binding in seawater sea sand concrete (SSC). It also examines the corrosion mechanism of seawater sea sand reinforced concrete (SSRC) and the impact of various admixtures on the hardening characteristics and corrosion resistance of SSC.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xiao-Yong Wang, Seokhee Lee, Hyeongkyu Cho
Summary: Previous studies mainly focused on the anti-corrosion performance of corrosion inhibitors, with limited research on the construction technology of applying corrosion inhibitors to hardened concrete. An experiment injecting corrosion inhibitors into concrete under high pressure was conducted, revealing that the water-cement ratio significantly influences the inhibitor and proposing a predictive equation for inhibitor penetration. Pressure and pressurizing time were crucial factors in measuring nitrite ion concentration in concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Environmental
Yuhao Hu, Guannan Liu, Yugui Yang, Yuxin Cao, Jing Wang, Dayu Ye
Summary: In this study, a fractal diffusivity model considering the fractal characteristics of concrete pore structure and a fluid-solid-chemical coupling model considering the non-uniform corrosion of iron were established. The corrosion thickness and pore structure evolution of concrete under different chloride ion concentration invasion and porosity were simulated. The results show that the fractal dimension of tortuosity decreases and then sharply decreases in the initial stage of corrosion, concrete with low porosity has a more significant improvement in transport due to chloride ion invasion, and concrete porosity has a nonlinear effect on steel corrosion and concrete pore structure evolution.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Construction & Building Technology
Stephen Sammut, Edward Gatt, Ruben Paul Borg
Summary: This paper discusses the potential role of chloride ions in rebar corrosion in reinforced concrete structures and proposes an embedded chloride ion sensory system for real-time detection and corrective action. Through evaluating existing technologies, the study identifies galvanic voltage measurement as a promising area for developing miniaturized chloride ion detection sensors.
STRUCTURAL CONTROL & HEALTH MONITORING
(2021)
Article
Chemistry, Physical
Benjamin Valdez-Salas, Ramiro Vazquez-Delgado, Jorge Salvador-Carlos, Ernesto Beltran-Partida, Ricardo Salinas-Martinez, Nelson Cheng, Mario Curiel-Alvarez
Summary: This study evaluated the potential of Azadirachta indica leaf extract as a corrosion inhibitor for carbon steel in reinforced concrete. Results showed that the Neem treatment did not affect the concrete integrity and showed good long-term corrosion protection.
Article
Construction & Building Technology
Wagner Alessandro Pansera, Thiago Alessi Reichert, Gustavo Savaris, Carlos Eduardo Tino Balestra
Summary: Reinforcement corrosion due to chlorides is a major issue for the durability of reinforced concrete structures in the marine environment. The traditional diffusion-based model fails to accurately simulate chloride transport, leading to significant discrepancies between modeled and measured data. This study proposes an empirical chloride transport model using Gaussian-Lorentzian functions, which provides a more realistic and accurate representation of chloride penetration in concrete structures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Luping Tang, Dimitrios Boubitsas, Liming Huang
Summary: This study examined the long-term performance of different concrete mixes in a highway environment with de-icing salt. The results showed that chloride penetration was weaker compared to marine splash environments. The estimated critical chloride content for corrosion initiation was found to be around 0.3% by mass of binder. The ClinConc model was modified to better describe chloride profiles in the concrete at this exposure site.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Chemistry, Physical
Magdalena German, Jerzy Pamin
Summary: Reinforced concrete structures are prone to severe damage from chloride corrosion of reinforcement, which can cause cracking of the surrounding concrete. To simulate the corrosion process, the initiation phase is examined considering oxygen and chloride transport, as well as corrosion current flow. A combination of numerical methods is used to predict evolving chloride concentration and time to reinforcement depassivation.
Article
Construction & Building Technology
Manu Harilal, Deepak K. Kamde, Sudha Uthaman, R. P. George, Radhakrishna G. Pillai, John Philip, Shaju K. Albert
Summary: The study investigates the long-term corrosion resistance of a novel ternary-blended reinforced concrete system, showing that CFNI concrete has better corrosion resistance compared to other systems. CFNI concrete exhibits a higher polarization resistance value and lower chloride ingress rate than other concretes, with no microcracks or pores observed at the corroded concrete-steel interface in CFNI specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
Maohua Zhang, Shanghui Sun, Ke Liu, Tao Li, Haixu Yang
Summary: This paper summarizes the factors influencing the critical chloride content in marine concrete reinforcement corrosion and systematically elaborates the determination methods of corrosion initiation time. The analysis suggests that nanomaterials have a significant impact on the critical chloride content. Additionally, concrete in the splash zone and tidal zone is more susceptible to chloride erosion, emphasizing the importance of addressing this in practical engineering.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Thiruman Ramesh, Dhanraj Suji, M. A. Quraishi
Summary: This study systematically investigated the corrosion of thermo-mechanically treated rebars with and without 3.5% NaCl in simulated concrete pore solution. The results showed that the inhibitors, glucosamine and stevioside, exhibited better corrosion inhibition effectiveness and higher polarization resistance and charge transfer resistance values in SCPS. In addition, the optimized concentration of the inhibitors also showed better performance in admixed concrete against corrosion, with the stevioside inhibitor showing the highest corrosion inhibition efficiency. The findings suggest the importance of using these green corrosion inhibitors to enhance the durability of concrete structures.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2022)
Review
Construction & Building Technology
Heng Yang, Chuansheng Xiong, Xiaoyan Liu, Ang Liu, Tianyu Li, Rui Ding, Surendra P. Shah, Weihua Li
Summary: Hydrotalcite materials, also known as LDHs, have strong ion exchange properties and are widely used in reinforced concrete corrosion protection. LDHs intercalating with corrosion inhibitors have multiple functions, such as reducing degradation, prolonging protection effects, and improving environmental alkalinity. The calcination-rehydration method shows potential for large-scale application in preparing LDHs.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Duc Thanh Tran, Han-Seung Lee, Jitendra Kumar Singh
Summary: The hybrid inhibitor consisting of 2 wt% L-arginine (LA) and 0.25 wt% trisodium phosphate dodecahydrate (TSPDH) exhibits excellent performance compared to organic or inorganic inhibitors alone. The chloride threshold of this hybrid inhibitor is 6 wt% NaCl, providing effective corrosion protection for steel rebar in simulated concrete pore solution.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
