Resistance of Calcium Sulphoaluminate Cement-based Coral Sand Mortar to Chloride Ingress

Abstract

The utilization of discarded coral debris in cementitious material is a prominent research area for island construction projects. The aim of this study is to explore the use of environment-friendly cement and waste coral sand in the preparation of coral mortar, while investigating its performance when exposed to a chloride environment. Three types of low-carbon cements were employed, such as rapid hardening sulphoaluminate (RCSA) cement, high belite sulphoaluminate (HBCSA) cement, and slag sulphoaluminate cement (SSC). The coulomb electric flux, mechanical properties, free chloride content, and mass change of the cement mortar under exposed to 3.5 wt% NaCl solution were examined at various time intervals. X-ray diffraction analysis was conducted to identify the mineral phases present in the mortar samples. The results demonstrate that the flex-ural and compressive strength of the mortar consistently increase throughout the 360 days chloride exposure period. Incorporating coral sand into SSC-based mortars enhances their compressive strength from day 28 up until day 360. However, it adversely affects the strength of HBCSA-based mortars. The behavior of mortars exposed to a chloride-rich environment is closely associated with the amount of C-S-H gel present within them. SSC generates a significant quantity of C-S-H gel which possesses a large specific surface area capable of absorbing more chloride ions thereby reducing their concentration within the mortar matrix as well as increasing its mass and improving resistance against chloride ion penetration.

Keywords

calcium sulphoaluminate cement / coral sand / chloride penetration / coral mortar

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Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature