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Experimental investigation on inhibiting compounds against steel corrosion in concrete admixed with different chloride salts
https://orcid.org/http://orcid.org/0000-0002-4511-4234
This experimental study reports the effect of internally admixed chloride salts and their associated cations on corrosion performance of sodium nitrite (NaNO2) and di-sodium hydrogen phosphate (Na2HPO4) in concrete. The performance of corrosion inhibitors in chloride contaminated concrete was monitored by conducting corrosion tests on reinforced cylindrical members at regular intervals up to 854 days. Chloride analysis and microstructure analysis were performed on powder concrete samples collected from adjacent to the rebar surface of cylindrical members. Results indicated that NaNO2 and Na2HPO4 increased the chloride binding of concrete thereby reducing the free chloride near rebar level. NaNO2 was more capable in protecting the steel passivity than Na2HPO4. In most of the cases, chloride salt plus Na2HPO4 showed more corrosion activity than that in the concrete with only chloride salt. Further, NaCl showed higher corrosion activity than MgCl2 and CaCl2. Between MgCl2 and CaCl2, initially MgCl2 exhibited higher corrosion activity than CaCl2. However, at later ages, CaCl2 showed more corrosion activity as compared to MgCl2. The ordinary Portland cement (OPC) mixes showed better performance against steel reinforcement corrosion than Portland pozzolana cement (PPC) mixes. The XRD and FESEM analyses confirmed the formation of more amount of calcium chloroaluminate in the concrete admixed with corrosion inhibitor plus chloride salt than that admixed with only chloride salt. The XRD analysis indicated more formation of calcium oxychloride in the concrete added with MgCl2 in comparison to CaCl2, whereas the formation of calcium chloroaluminate was higher in CaCl2 than MgCl2.
Experimental investigation on inhibiting compounds against steel corrosion in concrete admixed with different chloride salts
https://orcid.org/http://orcid.org/0000-0002-4511-4234
This experimental study reports the effect of internally admixed chloride salts and their associated cations on corrosion performance of sodium nitrite (NaNO2) and di-sodium hydrogen phosphate (Na2HPO4) in concrete. The performance of corrosion inhibitors in chloride contaminated concrete was monitored by conducting corrosion tests on reinforced cylindrical members at regular intervals up to 854 days. Chloride analysis and microstructure analysis were performed on powder concrete samples collected from adjacent to the rebar surface of cylindrical members. Results indicated that NaNO2 and Na2HPO4 increased the chloride binding of concrete thereby reducing the free chloride near rebar level. NaNO2 was more capable in protecting the steel passivity than Na2HPO4. In most of the cases, chloride salt plus Na2HPO4 showed more corrosion activity than that in the concrete with only chloride salt. Further, NaCl showed higher corrosion activity than MgCl2 and CaCl2. Between MgCl2 and CaCl2, initially MgCl2 exhibited higher corrosion activity than CaCl2. However, at later ages, CaCl2 showed more corrosion activity as compared to MgCl2. The ordinary Portland cement (OPC) mixes showed better performance against steel reinforcement corrosion than Portland pozzolana cement (PPC) mixes. The XRD and FESEM analyses confirmed the formation of more amount of calcium chloroaluminate in the concrete admixed with corrosion inhibitor plus chloride salt than that admixed with only chloride salt. The XRD analysis indicated more formation of calcium oxychloride in the concrete added with MgCl2 in comparison to CaCl2, whereas the formation of calcium chloroaluminate was higher in CaCl2 than MgCl2.
Experimental investigation on inhibiting compounds against steel corrosion in concrete admixed with different chloride salts
https://orcid.org/http://orcid.org/0000-0002-4511-4234
This experimental study reports the effect of internally admixed chloride salts and their associated cations on corrosion performance of sodium nitrite (NaNO2) and di-sodium hydrogen phosphate (Na2HPO4) in concrete. The performance of corrosion inhibitors in chloride contaminated concrete was monitored by conducting corrosion tests on reinforced cylindrical members at regular intervals up to 854 days. Chloride analysis and microstructure analysis were performed on powder concrete samples collected from adjacent to the rebar surface of cylindrical members. Results indicated that NaNO2 and Na2HPO4 increased the chloride binding of concrete thereby reducing the free chloride near rebar level. NaNO2 was more capable in protecting the steel passivity than Na2HPO4. In most of the cases, chloride salt plus Na2HPO4 showed more corrosion activity than that in the concrete with only chloride salt. Further, NaCl showed higher corrosion activity than MgCl2 and CaCl2. Between MgCl2 and CaCl2, initially MgCl2 exhibited higher corrosion activity than CaCl2. However, at later ages, CaCl2 showed more corrosion activity as compared to MgCl2. The ordinary Portland cement (OPC) mixes showed better performance against steel reinforcement corrosion than Portland pozzolana cement (PPC) mixes. The XRD and FESEM analyses confirmed the formation of more amount of calcium chloroaluminate in the concrete admixed with corrosion inhibitor plus chloride salt than that admixed with only chloride salt. The XRD analysis indicated more formation of calcium oxychloride in the concrete added with MgCl2 in comparison to CaCl2, whereas the formation of calcium chloroaluminate was higher in CaCl2 than MgCl2.
Experimental investigation on inhibiting compounds against steel corrosion in concrete admixed with different chloride salts
Mater Struct
Das, Jyotish Kumar (author) / Pradhan, Bulu (author)
2023-02-01
Article (Journal)
Electronic Resource
English
Thermodynamic Investigation of Allowable Admixed Chloride Limits in Concrete
| British Library Online Contents | 2018
| British Library Conference Proceedings | 2012