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Binfer slows computer8/15/2023 The chemical and physical properties of the hydration products are known to change with variations in properties, composition, and proportions of the components. Magnesium silicate hydrate (M–S–H) is one of the most recently developed and least investigated binders among the various MgO cementitious systems whose current state-of-the-art uses a formulation that is based on the hydration of light burnt MgO in the presence of reactive SiO 2. The aluminum present in the CC and MK helps to improve the overall characteristics of the MgO–SiO 2 binder. The durability indicators for MgO–MK concrete showed better or similar performance as compared to PC. MgO mixes with CC and MK showed a continual increase in compressive strength until 365 days whereas strength retrogression was observed in MgO–SF mixes after 90 days. In addition, elastic modulus and electrical resistivity was also measured on the concrete samples at all the above-mentioned ages. The compressive strength and porosity were measured at 7, 28, 90 and 365 days on mortar and concrete specimens. Concrete mixes comprising of MgO and MK or SF in a ratio of 1:1 and PC as a control mix were cast a water to binder ratio of 0.4. Thermodynamic modelling was carried out to further understand the changes occurring in the phase assemblage during hydration for the adopted proportions. Mortar specimens were prepared with all the three silica sources at three different proportion levels of MgO and silica source. In addition to silica fume (SF), the most widely used silica source with MgO, calcined clay (CC) with kaolinite content of ~ 40–50% and industrial grade metakaolin (MK) were also investigated. In this study, the performance of MgO–SiO 2 binder was assessed up to 365 days. Limited knowledge is available on the long-term mechanical and durability performance of M–S–H binder systems. Magnesium silicate hydrate (M–S–H) formed on reaction of MgO and reactive SiO 2 imparts binding characteristics similar to Portland cement (PC).
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