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Investigation on chloride resistance of high-volume slag low-carbon cement-based materials with crystalline admixture under seawater
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Journal Article
Investigation on chloride resistance of high-volume slag low-carbon cement-based materials with crystalline admixture under seawater
2024
Overview
Focusing on promoting the widespread application of crystal self-healing technology in marine concrete engineering and improving the durability of marine concrete, the research on the chloride ion transport behavior and corrosion resistance of concrete with crystal admixtures under the action of seawater is conducted. Ion chelator (CA) as crystalline admixture can obviously improve self-healing of cement-based materials. Results showed that CA improved pore structure of mortar, increased the compactness of matrix, and thus limited the chloride diffusion. After 3 months of erosion by NaCl + Na
2
SO
4
, NaCl + MgCl
2
and NaCl + MgCl
2
+ Na
2
SO
4
solutions, compared with control sample, the chloride diffusion coefficient of 100%OPC mortar with CA decreased by 49.3%, 47.4%, 56.5%, and 52.9%, respectively. CA-enhanced chloride binding ability of 100%OPC and 50%BFS mortar. Compared with control sample, the chloride binding efficiency of 100%OPC mortar with CA and 50%BFS mortar with CA increased by 26.1% and 35.5% after 3 months of NaCl solution corrosion, increased by 35.3% and 48.0% after 3 months of NaCl + Na
2
SO
4
solution corrosion, and increased by 46.2% and 61.9% after 3 months of NaCl + MgCl
2
solution corrosion, respectively. SEM analysis showed that CA could significantly improve internal microstructure of mortar under salts erosion. The correlation analysis of pore structure and chloride diffusion coefficient displayed that total porosity of mortar had better correlation with chloride diffusion coefficient than gel pore, transition pore, capillary pore and macropore after salt erosion. Therefore, CA mainly limited chloride diffusion into matrix by reducing total porosity of mortar under salt erosion. The research results of this paper can provide theoretical support and basis for the application of crystal self-healing technology in marine concrete.
Publisher
Springer US,Springer,Springer Nature B.V
Subject
Admixtures for underwater concreting
/ Analysis
/ Binding
/ Characterization and Evaluation of Materials
/ Chemistry and Materials Science
/ Chloride
/ Concrete
/ Corrosion and anti-corrosives
/ Crystallography and Scattering Methods
/ Ethylenediaminetetraacetic acid
/ gels
/ Porosity
/ Seawater
/ slags
