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Materials Science: Set-Retarders and -Accelerators  (1)


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Patents: Set Accelerators for Cement (18)
Patents: Set Accelerators for Plaster of Paris (1)


Cement setting accelerator and method of manufacturing the same
A cement setting accelerator comprising 100 parts (by weight) of a sintered body, 5 to 70 parts of an alkali metal carbonate powder and at most 170 parts of a lime powder.
Publisher: Kikuchi et al, Onoda Cement Co., Ltd. (Onoda, JP), 1992, US5160376
Cat: Patents: Cement Set Accelerators

Process for accelerating the setting and hardening of material which contains a hydraulic binder, setting and hardening accelerator and use of a mixture for accelerating the setting and hardening
A setting accelerator mixture which is free of alkali metals and free of chlorides. It contains at least one water soluble sulfate of a polyvalent cation and a further constituent which is selected from the group consisting of calcium aluminate, calcium sulfoaluminate, basic aluminum salts or mixtures thereof.
Publisher: Burge et al, Sika AG, vorm. Kaspar Winkler & Co. (CH), 1996, US5560774
Cat: Patents: Cement Set Accelerators

Retarder-Accelerator Combination
Described is a method of controlling the hydration behaviour of gypsum in the manufacture of composite materials, in particular board. The retarder-accelerator combination comprises a calcium salt of an N-polyoxymethylene amino acid and potassium sulfate.
Publisher: Sattler et al (Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung e.V., Munich, DE), 1998, US5846317
Cat: Patents: Gypsum Set Accelerators

Retarder-Accelerator Combination
Described is a method of controlling the hydration behaviour of gypsum in the manufacture of composite materials, in particular board. The retarder-accelerator combination comprises a calcium salt of an N-polyoxymethylene amino acid and potassium sulfate.
Publisher: Sattler et al (Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung e.V., Munich, DE), 1998, US5846317
Cat: Patents: Gypsum Set Retarders

Hydraulic cement set-accelerating admixtures incorporating glycols
Set accelerator, developed on the basis of US5348583, especially for low concrete temperatures.
Publisher: Arfaei et al, W.R. Grace & Co.-Conn. (New York, NY), 1994, US5348583
Cat: Patents: Cement Set Accelerators

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.
Publisher: Luthra et al, 1993, US5215585
Cat: Patents: Cement Set Retarders

Liquid accelerator for the setting of concrete mixtures
The accelerators are characterized by containing only potassium aluminate, potassium carbonate and potassium hydroxide in a defined range. They have a long shelf life even in higher concentrations than the liquid accelerators known heretofore and, within the defined concentrations, produce no precipitation.
Publisher: Allemann et al, Dynamit Nobel AG (Troisdorf, DE), 1985, US4504315
Cat: Patents: Cement Set Accelerators

Joint Filler based on alpha-hemihydrate (1987) (German)
Joint filler formulation based on alpha hemihydrate, fine grain calcium carbonate, 0.1 to 0.4% by weight of an alkaline salt of carbonic acid, 1.5 to 2.0% by weight of a thickener in the form of starch ether, 0.3 to 0.6% by weight of a water-retention agent in the form of methylcellulose, 2.5 to 5.0% by weight of a mixture of a vinyl polymer and polyvinyl alcohol in the form of a dispersion powder, 0.5 to 2.5% by weight of fibres and an accelerator/retarder combination as well as small quantities of gelifying agent and a polyelectrolyte.
Publisher: Andrea Glatthor
Cat: Guide Formulations: Joint Fillers

Hydraulic cement set-accelerating admixtures incorporating glycols
Set accelerator especially for low concrete temperatures.
Publisher: Arfaei et al, W.R. Grace & Co.-Conn. (New York, NY), 1994, US5340385
Cat: Patents: Cement Set Accelerators

Chloride-free setting accelerator for hydraulic binding agents
Alkali-free setting- and hardening-accelerator based on aluminum hydroxide, a water soluble sulfate, nitrate or formate salt (of calcium, magnesium, iron or aluminum), and a cellulose ether.
Publisher: Burge et al, Sika AG, vorm. Kaspar Winkler & Co. (CH), 1985, US4507154
Cat: Patents: Cement Set Accelerators

Setting- and hardening-accelerator containing no chloride and nitrite and a method to accelerate the setting and hardening of hydraulic binders and mixtures thereof
A setting- and hardening-accelerator for hydraulic binders containing at least a nitrate- or sulfite component, at least a thio-cyanate component, at least an alkanolamine component and at least a carboxylic acid component.
Publisher: Buerge et al, Sika AG, vorm. Kaspar Winkler & Co. (CH), 1997, US5605571
Cat: Patents: Cement Set Accelerators

Accelerator for portland cement derived from fertilizer
Method of producing a calcium nitrate composition, and the resulting composition, for use as a accelerator for time of set for portland cement in concrete and mortars comprising the steps of reacting a calcium ammonium nitrate hydrate composition with a tri- or tetramethylolglycoluril (TMGU) to crosslink with and convert the ammonia present therein into non-reactive, water-soluble components which exist in an aqueous medium at selected conditions of time, temperature, and pH.
Publisher: Michael F. Pistilli, Gifford-Hill & Company, Inc. (Dallas, TX), 1990, US4897120
Cat: Patents: Cement Set Accelerators

Hydraulic cement set accelerators based on nitroalcohols
The admixture compositions comprise one or more nitroalcohols. Suitable nitroalcohols include 2-nitro-2-methyl-1-propanol, 2-nitro-2-ethyl-propanediol, tris(hydroxy-methyl) nitromethane, 2-bromo-2-nitro-1,3-propanediol, and nitroethanol. The nitroalcohols 2-nitro-2-methyl-1-propanol and 2-nitro-2-ethylpropanediol are preferred.
Publisher: Gartner et al, W. R. Grace & Co.-Conn. (New York, NY), 1996, US5531825
Cat: Patents: Cement Set Accelerators

Chloride-free set accelerated cement compositions and methods
Trihydroxybenzoic acid and disodium dihydroxybenzenedisulfonate (or derivatives) as accelerators for portland cements.
Publisher: Fry et al, Halliburton Company (Duncan, OK), 1992, US5127955
Cat: Patents: Cement Set Accelerators

Use of basic aluminium sulphates as low-alkali set accelerators for cement
The improved set accelerating mixtures comprise basic aluminum sulphates of the formula: Al(OH)a (SO4)b, in which the subscripts satisfy the conditions: a=3-2b and b=0.05 to 0.4.
Publisher: Helmboldt et al, Giulini Chemie GmbH (DE), 1997, US5660625
Cat: Patents: Cement Set Accelerators

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.
Publisher: Pacanovsky et al, Sandoz Ltd. (Basel, CH), 1997, US5634972
Cat: Patents: Cement Set Accelerators

Nordmann, Rassmann GmbH (NRC)
Sells epoxy resins and curing agents for them (produced by Dow Chemical and Air Products), accelerators for the curing agents, bifunctional glycidyl ethers as reactive flexibilizers and glycidyl ethers as diluents.
Cat: Suppliers of Raw Materials: Epoxy Resins, Epoxy Curing Agents

Arenesulfonic acids as additives for portland cement (German)
Arenesulfonic acids could be used as accelerators or retarders due to addition of different concentrations to ordinary portland cement (OPC) pastes. The study focuses on the mechanism. With an English abstract.
Publisher: Stefan Andreas Stöber, Dissertation, 1999
Cat: Materials Science: Cements

Acid formates for use as setting and early strength development accelerators in cementitious compositions
Sodium, calcium and ammonium salts of formic acid as early strength developers and setting accelerators in hydraulic cements. The salts used are acidic salts containing between 1.5 and 5 moles of the formate ion per mole of the cation. These salts have much greater solubility and are more effective than the corresponding calcium salts, particularly under low temperature conditions.
Publisher: Berry et al, BP Chemicals Limited (London, GB2), 1981, US4261755
Cat: Patents: Cement Set Accelerators

Joint Filler based on alpha-hemihydrate (1995) (German)
The joint filler comprises alpha hemihydrate, methylcellulose, starch ethers, polyvinyl alcohol, cellulose fibres, ground limestone and mica, and also a vinyl acetate-ethylene copolymer and/or a vinyl acetate-vinyl versatate copolymer and also flocculants, accelerators and retarders. The mineral mixture of alpha hemihydrate, ground limestone and mica is milled to a particular particle size distribution. Together with the synthetic polymer component this gives a joint filler which, as a result of its behaviour, has very good processability, non-sag properties and excellent joint strength.
Publisher: Andrea Glatthor
Cat: Guide Formulations: Joint Fillers


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