Reference | Presenter | Authors (Institution) | Abstract |
---|---|---|---|
04-048 | Roberto Cesar de Oliveira Romano | Muniz, G.H.(University of São Paulo); Romano, R.C.(University of São Paulo); Mesquita, J.A.(University of São Paulo); Brasileiro, G.C.(University of São Paulo); Maciel, M.H.(University of São Paulo); Pileggi, R.G.(University of São Paulo); Cincotto, M.A.(University of São Paulo); | The physico-chemical characteristics of
particles have direct effect on the hardening process of cementitious
suspensions. The greater fineness and mineralogical composition leads to change
the solubility of the particles and can to create nucleation points, whose affect
the kinetics of reaction and, consequently, the formation of hydrated products.
So, the use of different kinds of mineral addition in association of Portland
cement becomes this stage more complex. This study shows the influence of
partial replacement of Portland cement by different kind of mineral addition in
the hydration reactions and chemical shrinkage of cementitious pastes. For
this, pastes were prepared using replacements of 10% by mass of silica fume,
metakaolin, ground blast furnace slag, limestone filler and red mud, and a
reference paste, using a constant water-to-solid ratio of 0.5. Chemical
shrinkage was measured continuously automating the method of dilatometry, and
the hydration kinetics was evaluated using an isothermal conduction calorimetry.
The results show that there is an excellent relationship between chemical
shrinkage and calorimetry and the addition of different kind of mineral
addition leads to changes of the hydration kinetics, which also affect the
chemical shrinkage.<!--[if gte mso 9]> |
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