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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: The Influence of Superplasticizers on
the Dissolution of C3S
Author(s): T. Sowoidnich and C. Rößler
Publication: Special Publication
Appears on pages(s): 335-346
Keywords: dissolution; hydration; superplasticizers.
Abstract:The hydration of tricalcium silicate (C3S), the major component of portland
cement, determines setting and strength of concrete. Setting of portland cement pastes (that is, concretes) is strongly affected by the use of superplasticizers (SP).
As it is commonly agreed, the hydration of C3S proceeds through a dissolution
precipitation process. Thus, the present study investigates the dissolution behavior of C3S in dependence of SP addition. Dissolution experiments are carried out at paste conditions (w/C3S = 0.5) and at high liquid-solid ratio (w/C3S = 50). It is shown that in the presence of SP the ionic concentrations in the solution are shifted to lower calcium and higher silicon values. The reason might be a varied degree of C3S hydration, complex formation, or shifted ion concentrations due to the presence of ions introduced by SP addition (that is, Na). Additionally, calorimetric analysis clearly shows that in the presence of SP the dissolution heat of C3S is increased. It is concluded that in the presence of SP the dissolution of C3S is not diminished but rather unchanged or even increased.
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