Abstract
In this study, reverse osmosis brine (ROB) and sodium aluminate (NA) were used as mix water and an activator for ground granulated blast furnace slag (GGBFS), respectively, to investigate the hydration reaction and mechanical properties of the GGBFS. Samples with NA alone and a combination of NA and 5% and 10% CaO were fabricated using tap water (TW) and ROB as mix water. The addition of CaO enhanced the effect of the NA activator in increasing the strength of the samples. With the NA–CaO combination, TW samples promoted the formation of C2ASH8 and C3AH6 phases more than the ROB samples. In the ROB samples, Friedel’s salt was formed. The strength of the TW samples was lower than that of the ROB samples, attributed to the abundantly formed C3AH6 phase in the TW samples. The NA–CaO–ROB samples improved the chloride ion adsorption capacity by increasing the Ca/Si ratio of the hydration reactant. However, in the ROB samples, Friedel's salt was decomposed due to carbonation by air exposure, increasing the concentration of chloride ions in the pore solution and promoting calcite formation. The NA–CaO–ROB samples confirmed the effectiveness of NA as a new GGBFS activator and the potential of ROB as a building material.
Published Version
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