W. R. Grace Co.-Conn.

Other

Nof Corporation

Gcp Applied Technologies Inc.

Hideo Koyata

Lawrence L Kuo

Byong-Wa Chun

Ellis M Gartner

David Charles Darwin

Ara A Jeknavorian

Ying Hai Chen

Susumu Honda

Felek Jachimowicz

Leslie A Jardine

Chia-Chih Ou

Ahmad Arfaei

Christon L Hill

Kevin J Folliard

David J Myers

Mark F Roberts

Nathan A Tregger

Klaus-Alexander Rieder

Elizabeth Burns

Shuqiang Zhang

Miho Miyakawa

Tomoyuki Tsutsumi

Darrick B McGuire

Tadashi Hara

Ivana Jovanovic

Darrick B Mcguire

Shu-Qiang Zhang

Ying Chen

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 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

Cationic polymers for treating construction aggregates

The present invention relates to the use of polycationic compound in combination with a hydroxycarboxylic acid or salt thereof to enhance slump retention in cements and concretes having clay-bearing aggregates, wherein the clay otherwise absorbs or diminishes the dosage efficiency of polycarboxylate superplasticizers.

Modifying clay activity and slump retention in cementitious compositions

A concrete admixture composition concurrently using (A) a polycarboxylic acid type water-reducing agent for concrete, (B) a hydroxycarboxylic acid type water-reducing agent for concrete, and (C) a polysaccharide type thickening agent is offered, with the view to manufacture a high-performance and multi-functional concrete excelling in high fluidity, freshness retention, early strength, pumpability, material segregation resistance and anti-washout properties under water.

Concrete or mortar admixture composition

The present invention relates to dispersants such as superplasticizers for hydratable cementitious compositions, and more particularly to methods for achieving variable degrees of longer slump life in concrete and mortar without loss of stability. This is achieved by using two admixture systems. The first admixture composition has multi-components for achieving initial-slump-enhancement, later-slump-retention, and limiting initial slump. The second admixture composition has the later-slump-enhancing component. Alternatively, conventional water reducers or superplasticizers can be employed initially, followed by the later-slump-enhancing admixture composition.

Slump retention in cementitious compositions

In the preparation of aqueous cement compositions containing a plasticizer, such as an EO/PO polymer-containing plasticizer, or EO/PO comb polymer-containing plasticizer, and further containing clay, such as a smectite clay, which expands when in contact with water, the step of providing an agent operative to modify the clay whereby the plasticizer absorbing capability of the clay is reduced. In exemplary methods of the invention, the plasticizer is an EO/PO (e.g., oxyalkylene) plasticizer and preferably an EO/PO comb polymer, and the clay-activity-modifying agent may comprise an inorganic cation, an organic cation, a polar organic molecule capable of being absorbed by the clay, a clay dispersant (such as a polyphosphate), or a mixture thereof. For clay-activity-modifying agents which comprise a cation or a polar organic molecule, the agent is preferably added to the clay before water is introduced to the clay. For clay dispersant agents and some organic cations such as quaternary amines (which have a strong affinity for cationic exchange with the clay), the agent may be added before, during, or after water is introduced to the clay.

Admixture for optimizing addition of EO/PO plasticizers

Admixture and method for optimizing addition of EO/PO superplasticizer to concrete containing smectite clay-containing aggregates

The present invention is directed to an imidized polycarboxylic acid polymer useful as a cement admixture, to improved cement compositions containing said polymer and to a process of forming the same.

Cement admixture product having improved rheological properties and

An improved hydraulic cement and resultant hydraulic cement composition having an imidized acrylic polymer uniformly distributed therein.

Cement and cement composition having improved rheological properties

A cement admixture which when added to a cement composition, such as cement mortar or concrete inhibits slump-loss of the cement composition and improve its workability and applicability. The admixture is composed of copolymers from an alkenyl ether, a polyalkenyl ether and maleic anhydride.

Dispersant composition for cement having excellent property in

Cement admixture compositions formed from alkenyl ether/maleic anhydride copolymers having specific molecular structures have been found to impart a high degree of slump loss over a sustained period of time while not causing any significant set retardation of the treated cement based composition.

Cement admixture composition

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Atsugi, Japan

Hideo Koyata