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Root > Materials Chemistry > Patents > Mineral Binders > Expansive Cements, non-shrinking Mortars

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Materials Science: Expansion Cements, Shrinkage-compensating Concrete (3)

Patents: Shrinkage-reducing Additives (4)

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Hydration modifying agent for mortar or concrete with limited shrinkage
The invention concerns a hydration modifying agent for mortar and concrete comprising a combination of 30 to 80% of calcium sulphate, 3 to 60% of ethylene/propylene oxide copolymer and 0.5 to 6% of an activator for the copolymer.
Hrsg.: Vicat (France), US6436184, EP1032545, FR2771088, 1999

Method of producing stressing cement
A stressing cement is produced by mixing 58-62% by weight of Portland cement with an expanding component taken in an amount of 38-42% by weight. The expanding component consists of calcium sulphate, calcium oxide and an aluminate-containing material.
Hrsg.: Mikhailov et al, 1973, US3775143

Shrinkage compensating concrete with expansive additive
An expansive Portland cement incorporating an expansive additive which is a polymer incorporating a calcium compound reactive with the cement is described. The shrinkage compensating concrete produced is much less likely to crack and is used in slabs and other structural systems where cracking of the concrete is a problem.
Hrsg.: Soroushian et al (Board of Trustees operating Michigan State University, East Lansing, MI), 1996, US5489333

Mortar composition, useful as screed or flowable levelling compositions, comprises flow agents based on unsaturated mono/dicarboxylic acid (German)
A flowable mortar composition comprises Portland cement, additives based on powdered stone and latent hydraulic agents, aggregate, polymeric flow agents based on unsaturated mono- and/or dicarboxylic acid derivatives or oxyalkyleneglycol-alkenyl ethers and/or esters and a polymer dispersion and/or redispersible polymer powder based on vinyl-, acrylic or polyurethane polymers as well as water. The plasticizer acts as shrinkage-reducing agent.
Hrsg.: PCI Augsburg GmbH, 2001, DE10061410

Use of polypropylene glycol as additive for reducing the amount of shrinkage in dispersion powder compositions for building materials (German)
Polypropylene glycol (molecular weight 500 to 5000) is used as a shrinkage-reducing additive in dispersion powder compositions (addition rate 1 to 5%). The dispersion powder composition is particularly suitable for dry mortars which contain Portland cement as inorganic binder, and leads therein to lower shrinkage of the mortars.
Hrsg.: Wacker Chemie AG, 1993. EP0573036 (Equivalent: DE4218493)

Expansive material composition and expansive cement composition
The expansive material composition contains an expansive material and 1-15% calcium hydroxide. The expansive material contains hauynite, free lime and free gypsum. The expansive cement composition contains the expansive material composition, cement and aggregates.
Hrsg.: Hiroshi et al (Denki Kagaku Kogyo KK), 1999, JP11302047

Expansive cement
An improved expansive cement and method of forming same. An expansive clinker containing a stable calcium alumino sulfate compound is separately ground to a selected surface area > 4600 cm²/g. The ground expansive clinker is then blended with a ground cement clinker and with gypsum to form the expansive cement. The expansive cement formed in accordance with the present invention requires less of the expansive clinker than expansive cements known in the art to achieve the same magnitude of expansion.
Hrsg.: Edward Rice, 1983, US4419136

Expansive and shrinkage-compensated cements
This patent is the basis for the "Type K" expansive cements (together with US3155526 and US3303037).
Hrsg.: Alexander Klein, 1966, US3251701

Expansive cement and its method of manufacture
A method of preparing an expansive cement having a controlled expansion and the same workability as normal Portland cement and the cement so prepared.
Hrsg.: Deets et al (United States Steel Corporation), 1975, US3861929

Expansive cement
An improved expansive cement composition is provided which has the increased capability of being able to " grab" steel reinforcement members therewithin as the material is curing and expanding to result in effective stressing of the reinforcement members. This cement contains free CaO and some MgO uniformly distributed therein, with the remaining portion being primarily tricalcium silicate. The composition can be used directly as an expansive cement, or can be mixed with other cements such as Portland cements to impart expansive qualities thereto.
Hrsg.: General Portland Inc., 1977. US4002483 (Equivalent: DE2626126)

High calcium sulfate expansive clinker
Expansive calcium sulfoaluminate clinker containing a high proportion of calcium sulfate is prepared and is included in portland cement (e.g., by intergrinding calcium sulfoaluminate clinker with portland cement clinker) to contribute expansive ...
Hrsg.: Povindar K. Mehta (Chemically Prestressed Concrete Corporation, Calif.), 1974, US3857714

Shrinkage compensating cement
The reactive compound is coated with an alkali soluble, water insoluble material in order to delay the time within which the reactive compound will expand. Quicklime or Plaster of Paris are examples of reactive compounds which may be used.
Hrsg.: Theodore Houseknecht (Fuller Company), 1972, US3649317

Expansive cement admixture contg. alumina and calcium salts (German)
A cement admixture comprises an expansive material which is produced by mixing CaO raw material, Al2O3 raw material and CaSO4 raw material, followed by heat treatment, and which has a CaO/Al2O3 molar ratio of 6.5-18 and a CaSO4/A12O3 molar ratio of 1.5-4. Also claimed are (i) a cement composition, comprising cement and the above admixture; and (ii) chemically prestressed concrete produced by subjecting a cement mix of compsn. (i) to compaction in a mould and then hardening. [Use search function to find 'DE 4447852'.]
Hrsg.: Denki Kagaku Kogyo K.K., 2001, DE4447852

Expansive cements and components thereof
This patent is the basis for the "Type K" expansive cements (together with US3155526 and US3251701).
Hrsg.: Alexander Klein, 1967, US3303037

Expansive cement additives and process for producing the same
An additive which consists of alite crystals (size ranging from 50 - 100 µm, content 30 - 80%) and calcium oxide crystals (size 15 - 60 µm, content 2 - 27%) dispersed in a vitreous interstitial substance.
Hrsg.: Toshio Kawano (Onoda Cement Co., Ltd., Japan), 1974, US3785844

Expansive cement additive and cementitious material added therewith
Expansive additive consisting of a pulverized product of clinker containing 15 - 60% by weight of free CaO, 5 - 30% by weight of free CaF2, 30 - 80% by weight of 11CaO.7Al2O3.CaF2, and less than 10% by weight of other ingredients.
Hrsg.: Ube Industries, Ltd., JP, 1984, US4452637

Expansive cement and the method of producing such cement
An expansive cement containing, as the expansive additive, a material obtained by burning a raw material comprising calcium oxide, aluminium oxide and calcium sulfate in certain proportions and crushing the burnt product to obtain a particular grain size distribution. The expansive cement of this invention expands during the initial curing period and thereafter substantially maintains the originally expanded shape.
Hrsg.: Minoru Miki, 1970, US3510326

Cement additive comprising calcium sulfo-aluminate + organic adhesive + foaming agent + dispersing agent
Cement additive consisting mainly of calcium sulfo-aluminate, which forms ettringite having a high content of sulfate through hydration, 0.1 - 2.0% organic adhesive, 0.005 - 0.5% blowing agent and 1.0 to 6.0% dispersing agent is suitable for grout.
Hrsg.: Tsutomu Mizunuma, Tsukuru Azumi (Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JA), 1972, US3663287

Hydrated high alumina cement
Novel coated particles of high alumina cement as part of an expansive component. The particles have a core of substantially unhydrated high alumina cement and an outer layer of hydration products of the core, which outer layer delays the reaction.
Hrsg.: Shamim A. Sheikh, Canada, 1998, US5741357

Cement expanding agent
A calcium sulfoaluminate series cement expanding agent having a specific particle size distribution. This cement expanding agent is not influenced by the variation of curing condition and can develop a high expandability in the concrete.
Hrsg.: Yoshizo Ono; Tsutomu Mizunuma, 1974, US3819393

Expanding admixture, non-shrinking waterproofing Portland cement with expanding admixture and the process of its production
aromatic acid performs the etching of the aluminate components in the admixture and portlandcement klinker. fatty acid protects the liberated aluminatoorganic complexes from the atmospheric agents, i.e. moisture and carbonic acid.
Hrsg.: Domenico Grilli (IT), Ghennady Michailovic Kirillov (RU), Boris Emmanuilovic Udovic (RU), 2004. EP1384704

Expansive cement
An expansive cement composition which is made of particulate argillaceous and calcareous materials and contains from 1 - 70% of free CaO with the remaining portion being primarily tricalcium silicate and containing no dicalcium silicate.
Hrsg.: Allen et al (General Portland, Inc.), 1975, US3884710

Calcium aluminosulfate and expansive cements containing same
This patent is the basis for the "Type K" expansive cements (together with US3303037 and US3251701).
Hrsg.: Alexander Klein, 1964, US3155526

Expansive Cement
An expansive clinker containing a stable calcium alumino sulfate compound is separately ground (surface area > 4600 cm³/g). The ground expansive clinker is then blended with a ground cement clinker and with gypsum to form th expansive cement.
Hrsg.: Rice, Edward K. (United States), 1985, CA1197270

Process for producing cement expanding agents
Cement expanding agent is produced by burning a raw mixture containing CaO, Al2O3, SO3 and F, wherein the weight ratio of CaO/Al2O3 is 0.5 to 20, 0.2 to 20% of an inorganic fluoride and 30 to 80% of CaSO4 are contained.
Hrsg.: Koji Nakagawa (Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JA), 1974, US3801345

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