Conventional superplasticizers for concrete – regardless of the generation or raw material basis – mainly work via the mechanisms of ‘dispersion’ or ‘steric repulsion’. All superplasticizers up to now have demonstrated good results with Portland cements, for which they were originally conceived. However, in the case of cements that tend towards the fast formation (from approx. 2 minutes after the addition of water) of large, plate-shaped crystals, e.g. felspars, the function of many superplasticizers is considerably limited. Cements that tend towards this behaviour are, among others, the puzzolanic cements such as CEM II/A-P, CEM II/B-P and in particular CEM IV cements, if they come from ‘young’ puzzolanic regions, such as the Canary Islands, but also some blast furnace or composite cements. The superplasticizer Duroretard V5.48 from YaYa Materiales, S.L.U., whose development up to series production maturity took nearly 3 years, has a differentiated action.
YaYa Materiales, S.L.U.
E-38750 El Paso, Cno. de La Era, 16
San Miguel de La Palma (TF) – Islas Canarias
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