Corrosion Resistance and Mechanism of CSA-OPC Based Repair Materials in Artificial Seawaters
Several sulfoaluminate cement-ordinary Portland cement-based repair materials(CSA-OPC)were prepared,then their corrosion resistance in artificial seawaters containing NaCl,NaCl+Na2SO4,NaCl+Na2SO4+MgCl2 respectively were assessed via dry-wet cycle test,X-ray diffractometer(XRD)and scanning electron microscopy(SEM).The study focuses on the evolution of mass,compres-sive strength,bond strength and Cl-content of the CSA-OPC with the variation of OPC content and corro-sion process.The results show that in the test conditions with solutions of NaCl,NaCl+Na2SO4,NaCl+Na2SO4+MgCl2,an appropriate amount of OPC incorporation can significantly improve the corrosion re-sistance of CSA in artificial seawaters.When the content of OPC is 20％-30％,the mass change,com-pressive strength,bond strength and Cl-combination ability of CSA-OPC are the best.The Cl-infiltrated into the CSA-OPC materials are trapped through the formation of Friedel's salt,while the SO42-may inhib-it the combination of Cl-,and Mg2+may reduce the combination rate of Cl-by consuming more OH-.
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维普
