W. R. Grace Co.-conn.

W. R. Grace Co.

Chia-Chih Ou

Ara A Jeknavorian

Christon L Hill

Neal Steven Berke

Felek Jachimowicz

Leslie A Jardine

Hideo Koyata

Byong-Wa Chun

Robert M Spotnitz

Antonio J Aldykiewicz

Semyon D Friedman

Craig T Walloch

Kevin J Folliard

Arnon Bentur

Deborah Neumayer

Robert W McKinney

Shaohai Wu

Cynthia Louise Ebner

Julie C Yang

Leon Bablouzian

David Chin

Bahram Siadat

Milind V Karkare

Albert N Crawford

An exemplary composition for enhancing water repellency in cementitious material comprises a hydrophobic material solute that is dissolved in a glycol ether solvent. Thus, the composition is provided in the form of a non-aqueous solution or emulsion wherein water is in a noncontinuous phase. The use of such compositions to modify cementitious compositions and the cementitious materials obtained thereby are also described.

Integrally waterproofed concrete

An exemplary surface active agent admixture composition of the invention comprises (1) a first surface active agent comprising a betaine, an alkyl or aryl or alkylaryl sulfonate, or mixture thereof; and (2) a second surface active agent comprising a nonionic oxyalkylene-containing polymer surfactant. The present invention therefore provides a system for ensuring the presence in a hydratable cementitious composition (when hardened) a sufficient air volume and sufficient air void fineness and consistency. Further exemplary admixture compositions may comprise one or more plasticizers and one or more clay activity-modifying agents. Cementitious compositions and methods for modifying cementitious compositions, which incorporate the above-mentioned surface active agent combination, are also described. The invention provides the ability to adjust and stabilize air void systems in hydratable cementitious compositions, while allowing conventional air entraining agent (AEA) dosage practices to be followed.

Air management in cementitious mixtures having plasticizer and a clay-activity modifying agent

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

Additive which simultaneously provides water-repellency and flexural bond strength improvement in mortar, concrete, or cement. An exemplary composition include calcium stearate and a flexural bond strength enhancing material comprising a polymer having a backbone to which are attached carboxyl cement anchoring groups. A cementious composition and method for enhancing water-repellency and flexural bond strength in a mortar are also disclosed.

Mortar admixtures and method of preparing same

An additive is provided that comprises a single blend of an acid component and calcium stearate for simultaneously controlling both primary and secondary efflorescence in concrete, and particularly in concrete masonry units such as pavers. A preferred method comprises the steps of partially saponifying tall oil fatty acid with calcium hydroxide, and thereafter adding calcium stearate dispersion to form a stable emulsion blend. In another embodiment, potassium hydroxide is mixed with calcium stearate dispersion, then subsequently introduced into tall oil fatty acid to provide a non-emulsion TOFA/CSD blend.

Masonry admixture and method of preparing same

Intumescent sheets are having improved expansion characteristics are disclosed. The intumescent sheets comprise an inorganic fibrous material, a binder, and a heat expandable layer mineral composition containing at least 87.5% by weight of heat expandable interstratified layer minerals comprising interstratified layers of vermiculite and biotite.

Intumescent sheet material

A vermiculite composition capable of exhibiting a high degree of volume increase upon subjection to thermal exfoliation composed of vermiculite mineralogical species having specific gravity of from 2.5 g/cm.sup.3 to 2.9 g/cm.sup.3. Further, intumescent sheets formed with said vermiculite composition exhibit low initial expansion temperature and very high maximum expansion properties.

Vermiculite composition with improved thermal expansion properties

A method of rendering water resistant a vermiculite article such as a film or coating comprised of delaminated vermiculite lamellae is provided comprising the step of contacting the article with a solution of an inorganic monovalent cation selected from the group consisting of: H.sup.+, Na.sup.+, K.sup.+, Cs.sup.+, Rb.sup.+ and Fr.sup.+ and mixtures thereof. The invention further relates to a water resistant article such as a film or coating comprised of delaminated vermiculite lamellae, which article is produced by contacting the article with a solution of an inorganic monovalent cation selected from the group consisting of: H.sup.+, Na.sup.+, K.sup.+, Cs.sup.+, Rb.sup.+ and Fr.sup.+.

Water resistant vermiculite articles and method of their manufacture

A vermiculite composition composed of particulate vermiculite mineral species having a density of 2.3 g/cm.sup.3 to 2.7 g/cm.sup.3 which has intercalated cations of lithium or organo ammonium and to dispersions obtained therefrom.

Vermiculite composition with improved chemical exfoliation

A water resistant or repellant article comprised of delaminated vermiculite lamellae is provided, which article is produced by immersing the article in a solution of a cationic exchange agent. The invention further relates to a method of producing such a water resistant or repellant article comprising the step of contacting the film with a solution of a cationic exchange agent.

Water resistant/repellant vermiculite articles and method of their

Stable vermiculite dispersions which are substantially free of settling and a method of preparing same are provided. The dispersions are obtained by treating the vermiculite platelets of which the dispersion is comprised with an anionic chelating agent. The anionic chelating agent enhances the rate and degree of swelling of the vermiculite in an aqueous medium. The swollen vermiculite is delaminated by shearing to provide the inventive dispersions.

Vermiculite dispersions and method of preparing same

Stable vermiculite dispersions which are substantially free of settling and a method of preparing same are provided. The dispersion are obtained by treating the vermiculite platelets of which the dispersion is comprised with citrate anion. The citrate anion functions as a swelling agent for the vermiculite and enhances the rate and extent of swelling in an aqueous medium. The swollen vermiculite is delaminated by shearing to provide the inventive dispersions, which comprise a suspension of the delaminated platelets and citrate anion.

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Lexington, MA, United States of America

Chia-Chih Ou