caa a22 4500 463192974 CHVBK 20180406164914.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10973-006-7772-2 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7772-2 Pozzolanicproperties of a residual FCC catalyst during the early stages of cement hydration [Elektronische Daten] Evaluation by thermal analysis [Carolina Pinto, P. Büchler, J. Dweck] The catalyst used in fluidized catalytic cracking (FCC) units of refineries after several recovery cycles in regeneration units, reduces its activity and it is partially substituted by new catalyst in the process. As it has a high silicon and aluminum oxides content, the pozzolanic properties of a Brazilian FCC spent residual catalyst, used in different substitution degrees to cement, were evaluated by three thermal analysis techniques during the early stages of hydration of a type II Portland cement. NCDTA curves show in real time that the residual catalyst, accelerates the stages of cement hydration. TG and DSC curves of respective pastes after 24 h of hydration evidence the pozzolanic activity of the waste, respectively, by the lower water mass loss during the dehydroxylation of the residual calcium hydroxide and by the lower dehydroxylation endothermal effect. Within the analyzed period, the higher is the cement substitution degree, the higher is the pozzolanic activity of the residual catalyst. Springer-Verlag, 2007 catalytic cracking nationallicence DSC nationallicence NCDTA nationallicence pozzolanic activity nationallicence residual catalyst nationallicence TG nationallicence Pinto Carolina Chemistry School, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil aut Büchler P. Chemical Engineering Department, Polytechnic School, University of São Paulo, São Paulo, Brazil aut Dweck J. Chemistry School, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 715-720 1388-6150 87:3<715 2007 87 10973 https://doi.org/10.1007/s10973-006-7772-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7772-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pinto Carolina Chemistry School, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 700 1- Büchler P. Chemical Engineering Department, Polytechnic School, University of São Paulo, São Paulo, Brazil aut NATIONALLICENCE 700 1- Dweck J. Chemistry School, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 715-720 1388-6150 87:3<715 2007 87 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer