Chemical shrinkage of cementitious pastes with incorporation of different mineral additions

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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