The effect of milled fluidized catalytic cracking catalyst waste on calcium aluminate cement hydration and structure formation of binder

Abstract

In this work, the hydration of calcium aluminate cement (CAC, Al2O3>70%) binder mixtures with additives (0%, 1%, 5% and 10%) of non-milled fluidized catalytic cracking catalyst (FCCC) waste and milled FCCC waste was investigated. The methods of calorimetry, thermal analysis, XRD, SEM, as well as compressive strength evaluation were used. SEM and XRD analysis tests were also carried out for binder after it thermal treatment at the temperatures of 110°C and 1200°C. Milled and non-milled FCCC waste was found to shorten the induction period of the CAC hydration and accelerates the time of the secondary heat release effect, especially in specimens with the highest content of FCCC waste. However, the results obtained show differences in the effect of milled and non-milled waste on the formation of the structure of binder during its hardening and after firing in high temperature. SEM tests revealed significant changes in CAC binder microstructure caused by the added 5% and 10% of the milled FCCC.