Performance of mortar incorporating calcined marine clays with varying kaolinite content

This study is an attempt in exploring the feasibility of low-grade kaolinite clays, generated as waste from excavation works, supplementary cementitious materials and potential candidate for cement replacement. Clays five sources were investigated composition, pozzolanic reactivity effect on mortar strength durability. grinded calcined at 700 °C to convert into metakaolin. Thereafter, 30% by wt. was replaced with a combination clay limestone 2:1 wt ratio. The nature clays studied through thermo-gravimetric analysis (TGA), isothermal calorimetry (ITC) X-ray diffraction (XRD). corrosion resistance examined using electrical resistivity rapid chloride penetration tests (RCPT). Results show that marine Singapore general have low moderate content (20–40%). In ITC tests, blended mixes displayed accelerated hydration 20–30% higher heat per gram 7th day compared reference mix without any substitution. bound water calculated TGA results showed noticeable increase mixes, indicating additional products those samples. Though 10–20% decrease observed mortars samples 28-days, their remarkable improvement. charge passed during RCPT reduced 20–60% while increased 50–200% depending its properties. Overall, encouraging suggest use viable alternative replace thereby producing sustainable carbon concrete.