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Root > Materials Chemistry > Patents > Cement Set Retarders

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Dry mortars with improved processing properties (German)
The invention provides cementitious dry mortars comprising a) from 0.5 to 80% by weight of cement, b) from 0 to 97% by weight of fillers, c) from 0 to 3.5% by weight of thickeners, wherein a polymer powder composition is present, with d) from 1.0 to 80% by weight of redispersible polymer powder, e) from 0.02 to 4.0% by weight of one or more compounds from the group consisting of zinc oxide, zinc hydroxide, and zinc hydroxide carbonate, f) from 0 to 30% by weight of alkali metal hydroxide and/or alkaline earth metal hydroxide, based in each case on the overall weight of the dry mortar, the percentages by weight adding up to 100% by weight
Hrsg.: Wacker Chemie AG; Brillux GmbH & Co. KG; DE10113978, Nov. 2002

Hydration retarder
A method of reclaiming unset cement compositions by mixing a polymethoxy polyphosphonate to the unset composition to cause long-term retardation of cement hydration and subsequently treating the composition with a set accelerator to reinitiate hydration.
Hrsg.: Luthra et al, 1993, US5215585

Whey protein cement retarder
Whey protein (and modified whey protein) is described as a cement retarder especially for use downhole. The setting behaviour has been tested in class G oilwell cement at temeratures between 125 and 330°F (52-166°C).
Hrsg.: Halliburton Energy Services, Inc., 2003. EP1321445

Hydration control of cementitious systems
Neutralized salts of a alpha-monohydroxy di- or multifunctional carboxylic acid act at low dosages, usually below 4% by weight based on the weight of the hydraulic binder, as retarders. At higher dosages, i.e. greater than about 5% up to about 8% by weight based on the weight of the hydraulic binder, the neutralized salts reverse their roles and act as accelerators.
Hrsg.: Pacanovsky et al, Sandoz Ltd. (Basel, CH), 1997, US5634972

Reactivatable set-inhibited cementitious compositions
Aqueous grouting compositions based on high alumina cement have the onset of setting delayed for upwards of one month by the incorporation therein of a set-inhibiting agent such as boric acid or gluconic acid delta lactone and can then be rapidly reactivated for use by the incorporation therein of a reactivator, for example lithium carbonate, to produce a high strength hardened cementitious composition.
Hrsg.: Spensley et al, Societe Anonyme d'Explosifs et de Produits Chimiques (Paris, FR), 1982, US4455171

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