W. R. Grace Co.-conn.

Gcp Applied Technologies Inc.

Betzdearborn, Inc.

Other

Snf S.a.s.

L'beste Gat Ltd.

Lawrence L Kuo

Hideo Koyata

Ying Hai Chen

Roger Yiming Leung

Nathan A Tregger

Ellis M Gartner

Byong-Wa Chun

David Charles Darwin

Kenneth S Williams

Klaus-Alexander Rieder

Izabela Goc-Maciejewska

Ahmad Arfaei

Cedrick Favero

Stephen Klaus

Yohannes K Lemma

Christophe Roux

Keith St Jean

Natalia Jaskula

Pierre Estephane

David J Myers

Ho Joong Lee

Mark F Roberts

Ara A Jeknavorian

Lawrence R Roberts

Paul J Sandberg

Josephine H Cheung

Elizabeth Burns

Thord G Hassler

Denise A Silva

Romain Faivre

Durga V Subramanian

Danila F Ferraz

John L Gallagher

Steven R Prescott

O-il Kwon

Stephen P Klaus

Ying Chen

KlausAlexander Rieder

The present invention relates to very high workable yet controllable concrete mix design, admixture composition, and process for placing concrete. The mix design relates to particular aggregate/cement ratios and types which are characteristic of ready mix concrete (RMC), which provide high fluidity reminiscent of self-consolidating concrete (SCC), and which provides advantages over both RMC and SCC in terms of ease and speed in placement and finishability at the construction site placement zone, regardless of whether into a horizontal formwork (e.g., for slabs, floors) or into vertical formwork (e.g., for blocks, walls, columns, etc.), without loss of control and without generating high risks of segregation even when small amounts of water are added at the size to facilitate finishing of the concrete surface. An inventive admixture combination which enables this unique design involves two different polycarboxylate comb polymers in combination with two specific viscosity modifying agents, and this combination provides highly workable concrete to be placed in a controlled, efficient manner.

Controllable high flow concrete

The present invention provides a composition and method for controlling air voids in aqueous systems such as paints, coatings, sealants, adhesives, mastics, cements, mortar, masonry, or concrete, which comprises the reaction product of an oxidizing agent and a compound comprising at least one polyalkoxylated polyalkylene polyamine, at least one polyalkyoxylated polyethyleneimine, or a mixture thereof.

Method for defoaming cementitious compositions using polyamine oxides

Polyalkoxylated polyamine oxide defoaming compositions

Methods for plasticizing cementitious mixtures having relatively high water/cement ratio (at least 0.40 or higher) are surprisingly improved in terms of dosage efficiency, compared to conventional 'superplasticizer' polycarboxylate polymers, when the polycarboxylate polymer is formed from particularly small-sized, specifically selected monomer constituents: (A) polyoxyalkylene monomer represented by the structural formula (R)(R)C&#x2550;C(R)((CH)(CO)O(CH)(AO)R) wherein (AO)represents linear ethylene oxide groups and p is 5-23 and more preferably 5-15; (B) unsaturated carboxylic acid represented by (R)(R)C&#x2550;C(R)(C(O)OM) wherein M represents an alkali metal, the ratio of component A to component B being 20:80 to 50:50; and, optionally, (C) a hydrophilic monomer represented by (R)(R)C&#x2550;C(R)(CX) wherein R, R, and Reach represent hydrogen or methyl group, and X represents C(O)NH, C(O)NHR, C(O)NRR, SOH, CHSOH, or C(O)NHC(CH)CHSOH, or mixture thereof, wherein R, R, and Reach represent a Cto Calkyl group.

Method for low-to-mid-range water reduction of cementitious compositions

The present invention provides compositions and methods involving the use of a carboxylate graft polymer having high molecular weight and low ratio of acid-to-polyoxyalkylene groups. Such clay-mitigation is particularly useful for treating clay and clay-bearing aggregates, particularly those aggregates used for construction purposes. The present invention minimizes the need to wash the aggregates, thus preserving fine aggregates ('fines') content in construction materials, and thereby beneficiating the performance and/or properties of construction materials containing the clay-bearing aggregates.

Method for treating clay and clay-bearing aggregates and compositions therefor

Methods for plasticizing cementitious mixtures having relatively high water/cement ratio (at least 0.40 or higher) are surprisingly improved in terms of dosage efficiency, compared to conventional 'superplasticizer' polycarboxylate polymers, when the comb-type carboxylate copolymer is formed from two different polyether side chains having specifically selected monomer constituents.

Low-to-mid range water-reducing polymer with mixed polyoxyalkylene side chains

The present invention provides methods and compositions for treating clay-bearing aggregates, particularly those used for construction purposes, whereby inclusion of fines is maximized due to minimization of clay washing which tends to remove such fines, and whereby performance of the aggregate-containing construction material is enhanced. Exemplary methods comprise introducing to clay a water-soluble, functionalized polyamine comprising a water-soluble polyamine formed by reacting an amine compound with an epoxy compound, the polyamine thus reacted being functionalized through the use of certain halide, sulfate, or epoxy compounds.

Functionalized polyamines for clay mitigation

Low-to-mid-range water reduction using polycarboxylate comb polymers

The present invention provides methods, admixture compositions for treating clay-bearing aggregates used for construction purposes, and aggregate compositions for construction purposes. The clay-bearing aggregates are treated with a cationic copolymer made from two and preferably three different monomer components. Cementitious compositions containing the treated aggregates are also described.

Hydrophobic, cationic polymers for treating construction aggregates

The present invention provides a composition and method for modifying a hydratable cementitious composition such as concrete or mortar using at least three different, distinct carboxylate polymers, even when clay is present in the concrete or mortar that would otherwise diminish dosage efficiency of polycarboxylate polymer used as dispersant. The three polycarboxylate polymers, designated as Polymer I, Polymer II, and Polymer II, are derived from monomer Components A, B, and C wherein Component A is an unsaturated carboxylic acid, Component B is a polyoxyalkylene, and Component C is an unsaturated carboxylate ester. The component molar ratio ranges for A:B:C are different as between Polymers I and II; while a distinct component molar ratio A:B+C is identified for Polymer III. When treated with these three different polycarboxylate polymers, the hydratable cementitious composition is surprisingly enhanced in terms of initial workability and slump retention, especially if clay is present.

Optimizing polycarboxylate admixtures for cementitious compositions

Superplasticizing admixture for cementitious compositions

Cationic polymers for treating construction aggregates

The invention relates to compositions and methods for modifying cementitious materials such as by reducing setting time. Polymer compositions of the invention are derived by polyetherifying mono-glycerols, optionally with alkylene glycols, to obtain polyglycerol homopolymers or copolymers, and then carboxylating the obtained polyglycerol homopolymers and/or copolymers with an organic acid having at least two carboxylic functionalities. The set retardation effect of the carboxylated-carboxylic polyglycerol polymer compositions in cementitious materials is reduced is compared to polyglycerol polymer not having the carboxylated-carboxylic groups, while its water reducing ability is maintained without loss of early compressive strength. Cementitious compositions and methods involving the carboxylated-carboxylic polyglycerol are also covered by the invention.

Carboxylated-carboxylic polyglycerol compositions for use in cementitious compositions

The present invention discloses additive compositions, cementitious compositions, and methods for controlling air in cementitious compositions in which colloidal nano-particles are used for stabilizing a water-dispersible defoamer within a cement-dispersant-containing aqueous additive formulation for modifying hydratable cementitious compositions such as cement or concrete.

Stabilized defoamers for cementitious compositions

Growing community of inventors

Acton, MA, United States of America

Lawrence L Kuo