Chloride binding ability and anti-corrosion properties of supersulfated cement in seawater/sand mixing concrete

Abstract

In this study, we aim to shift attention to ability of chloride binding of supersulfated cement and its use for formulating sea water/sand mixing concrete. To formulate SSC cement, slag as main component is activated by high alkaline of C-H and the following reaction with SO42−. Material analysis (XRD, SEM/EDX) showed that effectively low-Ca-ettringite products were formed abundantly at early age and others chloride binding products such as Friedel’s salt, hydrotalcite in their turn were resulted at later age in high Cl− solution. Notable high ratios of bound Cl− on total Cl− indicate eventually capacity of hydrated cement matrix in neutralizing chloride content in seawater. As an addition, very low Cl− permeability of mortar specimen could be taken into account. By monitoring the corrosive state of embedded steel bar ϕ8 mm (inside mortar prism 40 × 40 × 160 mm, with seawater exposure condition), we observe no major deterioration due to such natural anti-corrosion phenomenon.