Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Controlling the Mix. Rheology is critical to optimising cement-based compositions
Since the 1980s the range of additives available to modify the behaviour and performance of concrete has greatly expanded. For many applications, control of concrete rheology is critical to obtaining the best performance. The impact of different concrete admixtures on rheology is discussed. Several types of superplasticiser are available. All reduce the yield stress (the point at which flow starts to occur) but they vary not only in their efficiency but in how this efficiency changes as hydration (setting) starts to occur. This can be important in ready-mix applications where there may be an extended period between mixing and use. Mineral fillers can reduce cement requirements in mixes and improve mechanical properties. Their effects on viscosity depend mainly on particle size and any interactions with the superplasticesrs. Polymeric stabilising agents are generally polysaccharides or starches, which can increase the thixotropy of the mix.
Controlling the Mix. Rheology is critical to optimising cement-based compositions
Since the 1980s the range of additives available to modify the behaviour and performance of concrete has greatly expanded. For many applications, control of concrete rheology is critical to obtaining the best performance. The impact of different concrete admixtures on rheology is discussed. Several types of superplasticiser are available. All reduce the yield stress (the point at which flow starts to occur) but they vary not only in their efficiency but in how this efficiency changes as hydration (setting) starts to occur. This can be important in ready-mix applications where there may be an extended period between mixing and use. Mineral fillers can reduce cement requirements in mixes and improve mechanical properties. Their effects on viscosity depend mainly on particle size and any interactions with the superplasticesrs. Polymeric stabilising agents are generally polysaccharides or starches, which can increase the thixotropy of the mix.
Controlling the Mix. Rheology is critical to optimising cement-based compositions
Schmidt, Wolfram (Autor:in)
European Coatings Journal ; 24-28
2015
5 Seiten, Bilder, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
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