Joachim Pakusch
Bosch
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Publication
Featured researches published by Joachim Pakusch.
Journal of Colloid and Interface Science | 2008
Anatol Zingg; Frank Winnefeld; Lorenz Holzer; Joachim Pakusch; Stefan Becker; Ludwig J. Gauckler
In this study the influence of polycarboxylate-based polyelectrolytes on the particle interaction among tricalcium silicate (C(3)S, main clinker phase), calcium silicate hydrates (CSH), and calcium aluminate sulfate hydrates (ettringite) (main hydration phases) has been examined. These phases are the constituents of major concern during early hydration of cement suspensions. The results of zeta potential measurements on single mineral phase experiments show that the phases C(3)S and CSH are positively charged in synthetic pore solution (liquid phase of hydrating cement suspension), whereas the ettringite is negatively charged. Due to these opposite charges, ettringite crystals should coagulate with CSH phases and/or deposit on surfaces of the much larger C(3)S clinker particles. This behavior was proven by cryo-microscopic analysis of high-pressure frozen cement suspensions, which illustrates the consequences of colloidal mechanisms on the microstructure of early cement suspensions. Furthermore, it is shown that the polyelectrolytes have a much higher adsorption affinity to ettringite surfaces (hydrate phase) compared to silicate surfaces. However, the results from rheology experiments reveal that the presence of polyelectrolytes has a strong impact on the suspension properties of all investigated mineral phases by decreasing yield stress and plastic viscosity. From the results it can be concluded that the ettringite is the dominant mineral phase in terms of the state of dispersion which includes particle-particle and particle-polyelectrolyte interaction in the bulk cement system.
Cement & Concrete Composites | 2007
Frank Winnefeld; Stefan Becker; Joachim Pakusch; Thomas Götz
Cement & Concrete Composites | 2009
Anatol Zingg; Frank Winnefeld; Lorenz Holzer; Joachim Pakusch; Stefan Becker; Renato Figi; Ludwig J. Gauckler
Cement and Concrete Research | 2008
Anatol Zingg; Lorenz Holzer; Andres Kaech; Frank Winnefeld; Joachim Pakusch; Stefan Becker; Ludwig J. Gauckler
Archive | 2002
Ekkehard Jahns; Hans-Juergen Denu; Joachim Pakusch; Horst Seibert; Marco Schmidt
Cement and Concrete Research | 2015
Xiangming Kong; Sebastian Emmerling; Joachim Pakusch; Markus Rueckel; Jörg Nieberle
Archive | 2002
Ekkehard Jahns; Hans-Juergen Denu; Joachim Pakusch; Horst Seibert; Marco Schmidt
Archive | 1998
Joachim Pakusch; Bernd Reck; Peter Claassen; Hans-Jürgen Denu; Eckehardt Wistuba; Claudia Heibel
Cement and Concrete Research | 2016
Xiangming Kong; Joachim Pakusch; Daniel Jansen; Sebastian Emmerling; Juergen Neubauer; Friedlinde Goetz-Neuhoeffer
Archive | 1997
Joachim Pakusch; Maximilian Angel; Joachim Roser; Andree Dragon; Heinrich Sack