The Dow Chemical Company

R Douglas Eash

Gale L Emig

James Peters

Ronald H Cooper

Robert D Vandell

Lz F Lamoria

Robert H Anspaugh

This invention is directed to cement additives consisting essentially of (1) a styrene-butadiene-acrylonitrile interpolymer latex, (2) a nonionic surfactant, (3) an anionic surfactant, and (4) a polyorganosiloxane foam depressant, which additives provide portland cement compositions having excellent strength properties.

Styrene-butadiene-acrylonitrile interpolymer latex based cement additives

This invention is directed to cement additives consisting essentially of (1) a styrene-butadiene interpolymer latex, (2) a nonionic surfactant, (3) a polyelectrolyte comprising the product obtained by copolymerizing methylmethacrylate and a sulfoester of .alpha.-methylene carboxylic acid or its salt, and (4) a polyorganosiloxane foam depressant, which additives provide portland cement compositions having excellent strength properties, workability and adhesion to cementitious substrates.

Styrene-butadiene interpolymer latex based cement additives

This invention pertains to improved shrinkage compensating portland cement concrete and mortar compositions comprising essentially an expansive portland cement, mineral aggregate, from about 5 to about 25 percent based on cement weight of a styrene-butadiene-1,3 copolymer having a styrene to butadiene weight ratio of about 30:70 to 70:30, water and certain minor amounts of nonionic and anionic surfactants, and a foam depressant. When properly restrained by either external restraints or internal restraints in the form of ordinary reinforcement or fibers of various lengths, these compositions possess improved mechanical and physical properties such as compressive and flexural strengths and unexpectedly enhanced freeze-thaw resistance. Such compositions are particularly suited for use in the construction of crack-free structures.

Shrinkage-compensating portland cement concrete and mortar compositions

A process for accomplishing a non-distressing accelerated heat cure of portland cement concrete systems comprising (1) admixing portland cement concrete with minor amounts of a vinylidene chloride polymer latex, than (2) heating the admixture to temperatures of from at least about 100.degree. F to about 250.degree. F under less than about 80 percent relative humidity for a period of at least about 4 hours. This process is particularly applicable for the preparation of portland cement concrete precasting and prestressing operations, where optimum strength is desired in the shortest possible time.

Growing community of inventors

Midland, MI, United States of America

R Douglas Eash