Abstract
Alternating current (AC) has been developed to be a promising method to accelerate the hydration of cement. For the bulk value-added utilization of electrolytic manganese slag (EMR), AC regulation technology for the early hydration of cement-solidified electrolytic manganese slag (CSE) may be the answer. TG, XRD, and ICP analyses were used to evaluate changes brought about by AC in the early solid phase and the aqueous species of the cement-EMR paste. EMR was calcined at 180 °C for 2 h to improve the reactivity. Two novel phenomena were found: 1) Gypsum depletion and the separation of SO42- adsorbed on C3A were both enhanced by AC. 2) The precipitation of CH and C-S-H was greatly increased by AC which could contribute to the raised Ca2+ concentration and effective saturation index of CH and C-S-H. The compressive strength of composite paste is increased by more than 100% under the action of AC. The recommended EMR content is 20%, according to the e-CO2 index and unit cement strength contribution index.
Published Version
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