Abstract

CASTELLANO, C; BONAVETTI, V  and  IRASSAR, E. Influence of water content on evolution of hydration slag cement pastes. Revista de la Construcción [online]. 2012, vol.11, n.1, pp. 64-74. ISSN 0718-915X.  doi: 10.4067/S0718-915X2012000100007.

The evolution of the hydration of cement pastes with granulated blast furnace slag depends on several factors including the characteristics of the addition (fineness, composition and reactivity) of the proportions of the mixture (slag content, w/b ratio, the presence of alkaline activators) and curing conditions (humidity and temperature). If remain constant characteristics of the slag and the curing conditions, the amount of slag hydration may depend on the content of water available for reaction. This paper evaluated the effect of the w/b (0.3, 0.4 and 0.5) on the evolution hydration and mechanical properties in pastas with variable content of granulated slag, blast furnace (0-80%) cured at 20 º C. The influence of individual variable on the compressive strength was determined from the analysis of the response surface central composite experimental design. The evolution hydration was evaluated through non evaporable water content and the amount of slag reacted. Complementary were detected by XRD hydration products.

Keywords : Granulated blast furnace slag; water/binder ratio; mechanical strength; slag reacted.