Filtern
Erscheinungsjahr
- 2012 (9) (entfernen)
Dokumenttyp
- Zeitschriftenartikel (9) (entfernen)
Sprache
- Englisch (4)
- Mehrsprachig (3)
- Deutsch (2)
Schlagworte
- Africa (6)
- Cement (6)
- Concrete (4)
- Proficiency testing (3)
- Round robin (3)
- Betonpflastersteine (1)
- Early cement hydration (1)
- Frühe Zementhydratation (1)
- Polycarboxylate ether vicat (1)
- Polycarboxylatether (1)
Self-compacting concrete (SCC) differs substantially from normal concrete as regards the quantity of superplasticiser dosage. The functionality of superplasticisers, based on the polycarboxylate ether (PCE) superplasticiser customary with SCC, is nowadays very well understood at construction material research level. However, knowledge concerning pertinent correlations does not always permeate practice to an equal extent. PCEs are extremely polymorphic as opposed to earlier superplasticiser groups, which still possess a considerable proportion of the superplasticiser market. The geometry of polymers can be adjusted individually to performance characteristics required for certain uses. Yet, in selecting a superplasticiser for its specified rheological properties, a very strong influence can equally be exerted simultaneously on the subsequent hydration process. The charge density of the PCE employed also plays a key role in connection with both rheology and early hydration.
SCM potential in Africa
(2012)
Clearing the way
(2012)
Sub-Saharan Africa is populated by more than half a billion people,
and rapid urbanization is creating challenges in the areas of housing,
roads, railways, power supply, dams and water pipelines —
aspects of infrastructure that are critical to the well being of the
population. This situation indicates that cement and concrete will
play a major role in the future construction technology in Africa, despite
the fact that it does not have a long-lasting tradition over most
of the continent. Although the continent is rich in natural resources
for the production of mineral binder systems, many sub-Saharan
African countries exhibit challenging boundary conditions, that have
to be well understood in order to use cement and concrete technologies
in a sustainable and reasonable way.