The hydration characteristics of MSWI fly ash slag present in C3S

This paper reports on an investigation of the hydration characteristics Of C3S and the mixing Of C3S with municipal solid waste incinerator (MSWI) fly ash slag. The results can be summarized as follows: TGA observations show lower amounts of CSH and Ca(OH)(2) in samples that incorporated MSWI slag into C3S, possibly due to the partial replacement of the C3S by slag with less activity. In general, the incorporation of slag into C3S decreases the initial hydration reactions, but it increases the pozzolanic reactions at a later stage by consuming Ca(OH)(2). As the hydration precedes, the C3S peaks decrease, up to 90 days, due to the activation of the slag by liberated Ca(OH)(2). As well, the amount of hydration products (Ca(OH)(2)) from the pure C3S pastes are more than for the C3S-slag pastes. Moreover, the degree of hydration of the C3S pastes increases with the curing time, the C3S-slag paste also shows that lower hydration degree values at all ages. (C) 2002 Elsevier Science Ltd. All rights reserved.