Early age hydration of model slag cement: Interaction among C3S, gypsum and slag with different Al2O3 contents

A deeper insight into SO3/Al2O3 ratio including the contribution of alumina in slag at early age is required to ensure a properly sulfated cement. In this paper, investigate effect gypsum and slag, emphasis was laid on hydration characteristics C3S-gypsum-slag system during age, which synthesized laboratory with varying Al2O3 contents from 3.69 18.19 wt%. The duration dormant period C3S depended content significantly; however, amount silicate reaction before onset aluminate independent chemistry added. rate controlled by availability reactants, SO42? Al3+ ions particular, were sourced respectively. Calcium monosulfoaluminate only occurred mixture when contained high (18.19 wt% study) its formation proceeded continuously expense ettringite. Sulfur rich species incorporated started participate after main peak C3S, it played similar role gypsum.