A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A short-term test method to determine the chloride threshold of steel–cementitious systems with corrosion inhibiting admixtures
Abstract Now-a-days, multiple types of corrosion inhibiting admixtures (CIAs) are being used to enhance the chloride threshold ($ Cl_{th} $) of steel–cementitious systems. However, due to the application of external potential to drive chlorides, some existing short-term test methods are not suitable to assess the $ Cl_{th} $ of S–C systems with CIAs containing anions. This paper presents the development of a Modified Accelerated Chloride Threshold (mACT) test to determine the $ Cl_{th} $ for S–C systems with CIAs. The test specimens consisted of a mortar cylinder with an embedded steel piece and electrodes forming a 3-electrode corrosion cell. The specimens were exposed to chloride solution and the linear polarization resistance tests were conducted every 3.5 days. The corrosion initiation was detected using statistical analysis of the repeated Rp measurements. After corrosion initiation, the chloride content in mortar adjacent to the embedded steel piece was determined and defined as $ Cl_{th} $. The time required to complete mACT test for an S–C system with CIAs is about 120 days. The $ Cl_{th} $ of eight specimens each with S–C system containing (i) without inhibitor, (ii) anodic inhibitor [calcium nitrite] and (iii) bipolar inhibitor [both calcium nitrite and amino alcohol] were determined. Both anodic and bipolar CIAs showed enhanced corrosion resistance. Also, the bipolar inhibitor performed better than anodic inhibitor. It was concluded that the use of CIAs could significantly delay the initiation of chloride-induced corrosion. The mACT test can be used to determine the $ Cl_{th} $ and estimate the service life during the planning and design stages of a project and help select durable materials.
A short-term test method to determine the chloride threshold of steel–cementitious systems with corrosion inhibiting admixtures
Abstract Now-a-days, multiple types of corrosion inhibiting admixtures (CIAs) are being used to enhance the chloride threshold ($ Cl_{th} $) of steel–cementitious systems. However, due to the application of external potential to drive chlorides, some existing short-term test methods are not suitable to assess the $ Cl_{th} $ of S–C systems with CIAs containing anions. This paper presents the development of a Modified Accelerated Chloride Threshold (mACT) test to determine the $ Cl_{th} $ for S–C systems with CIAs. The test specimens consisted of a mortar cylinder with an embedded steel piece and electrodes forming a 3-electrode corrosion cell. The specimens were exposed to chloride solution and the linear polarization resistance tests were conducted every 3.5 days. The corrosion initiation was detected using statistical analysis of the repeated Rp measurements. After corrosion initiation, the chloride content in mortar adjacent to the embedded steel piece was determined and defined as $ Cl_{th} $. The time required to complete mACT test for an S–C system with CIAs is about 120 days. The $ Cl_{th} $ of eight specimens each with S–C system containing (i) without inhibitor, (ii) anodic inhibitor [calcium nitrite] and (iii) bipolar inhibitor [both calcium nitrite and amino alcohol] were determined. Both anodic and bipolar CIAs showed enhanced corrosion resistance. Also, the bipolar inhibitor performed better than anodic inhibitor. It was concluded that the use of CIAs could significantly delay the initiation of chloride-induced corrosion. The mACT test can be used to determine the $ Cl_{th} $ and estimate the service life during the planning and design stages of a project and help select durable materials.
A short-term test method to determine the chloride threshold of steel–cementitious systems with corrosion inhibiting admixtures
Karuppanasamy, Jayachandran (author) / Pillai, Radhakrishna G. (author)
2017
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2017
Evaluation of Corrosion-Inhibiting Concrete Admixtures
| NTIS | 1998