Portal de Periódicos da CAPES

Microstructural control and hydration of novel micro-dendritic clinkers with CaO/SiO 2 = 1.4

2015; Elsevier BV; Volume: 76; Linguagem: Inglês

10.1016/j.cemconres.2015.06.004

1873-3948

Rodrigo Lino Santos, Ricardo Bayão Horta, João R. Pereira, Teresa Nunes, Paulo Novis Rocha, José N. Canongia Lopes, R. Colaço,

Advanced ceramic materials synthesis

In this paper we describe the production of CaO/SiO2-based hydraulic binders formed of dendritic belite embedded in an amorphous phase. These hydraulic binders are produced by a process involving heating the raw materials with a specified CaO/SiO2 ratio to a temperature bellow the liquidus surface, followed by a two-step cooling ramp, in order to obtain during solidification a dendritic morphology of the crystalline phase. After milling the clinker obtained by this process, and by adding up to 25% of water, the paste sets showing mechanical resistances that went up to 4 times higher the values obtained for a reference round shape belite clinker. This result opens the possibility of developing a novel belite-based clinker, that may lead to a relevant reduction of the CO2 emissions, as compared to common alitic clinkers.