TY - JOUR AU - Fernández-Jiménez, A. AU - Puertas, F. PY - 2001/03/30 Y2 - 2024/03/28 TI - Alkaline activated slag cements. Determination of reaction degree JF - Materiales de Construcción JA - Mater. constr. VL - 51 IS - 261 SE - Research Articles DO - 10.3989/mc.2001.v51.i261.380 UR - https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/380 SP - 53-66 AB - The aim of the present work was to evaluate the validity of non-calorimetric different methods, used in the determination of reaction degree of alkaline activated slag pastes. The methods used were: (a) chemical separation by methanol-salicylic acid; (b) determination of the weight loss mass between 100-600°C in TG curves, associated to chemically combined water; (c) quantification of the -74 ppm signal in <sup>29</sup>Si MAS-NMR spectra.The parameters considered in the process were: nature of the alkaline activator (Waterglass, Na<sub>2</sub>CO<sub>3</sub> and NaOH), activator concentration (4% and 3% Na<sub>2</sub>O in mass with respect to the slag), curing temperature (25 and 45°C), slag specific surface (460 and 900 m<sup>2</sup>/kg) and time of reaction (from 7 days to 18 months).The results obtained indicate that none of the three methods is definitive but complementary and they provide to follow the reactive evolution of the alkaline activated slag cements. The method based on the quantification of the -74 ppm signal in the <sup>29</sup>Si MAS NMR is the most suitable method. ER -