W. R. Grace Co.-conn.

Gcp Applied Technologies Inc.

Leon Bablouzian

Michael D Morgan

Robert A Wiercinski

Xiudong Sun

Lawrence S Shapiro

Benita Dair

Antonio J Aldykiewicz, Jr

Laura A Tennenhouse

William J Hurley, Jr

Eric P Koehler

Chia-Chih Ou

Arthur Kyriazis

Bruce Perry

The present invention provides a method for making sand compositions wherein manufactured sand particles are pretreated with a clay-mitigating polycation and blended with natural sand particles that have washed to remove fines such that at least 90% of the natural sand particles are retained on a 75 micron sieve. Methods of the invention also involve the use of the blended pretreated sand for making concrete wherein the sand is combined with cement, a polycarboxylate type dispersant, a further amount of clay-mitigating polycation compound, and at least one hydryoxyl or hydroxyl carboxylic acid or salt compound.

Clay-bearing manufactured sands for hydratable cementitious compositions

Methods, systems, and devices for installing barriers in openings of gaps in or between structures such as walls, ceilings, and floors are described herein. At least one barrier molding bag is positioned in the hole or gap, and a flowable firestop material that is preferably operative to cure or harden, such as a hydratable cementitious slurry, is introduced into the bag to create a barrier in the hole or gap.

In situ molded thermal barriers

The invention provides methods, systems, and devices for installing thermal barriers in openings or gaps in or between structures such as walls, ceilings, and floors. At least one thermal barrier molding bag is positioned in the hole or gap, and a flowable firestop material that is operative to cure or harden, such as a hydratable cementitious slurry, is introduced into the bag to mold a barrier in the hole or gap.

The invention provides methods, systems, and devices for installing barriers in openings or gaps in or between structures such as walls, ceilings, and floors. At least one barrier molding bag is positioned in the hole or gap, and a flowable firestop material that is preferably operative to cure or harden, such as a hydratable cementitious slurry, is introduced into the bag to create a barrier in the hole or gap.

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.

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Framingham, MA, United States of America

Leon Bablouzian