Sika Ag, Vorm. Kaspar Winkler & Co.

Sika Schweiz Ag

Sika Ag, Vorm, Kasper Winkler & Co.

Theodor A B&uuml;rge

Franz Wombacher

Urs M&auml;der

Ueli Sulser

Ulf Velten

Beat Marazzani

Marcel Sommer

J&uuml;rg Widmer

Irene Schober

Anna Krapf-Huber

Method for rehabilitative and/or protective corrosion-inhibition of reinforcing steel embedded in a hardened concrete structure by means of surface-applied corrosion-inhibiting compositions

On object of the present invention is an agent for the reduction of the degree of shrinkage in hydraulic binders, whereby said comprises an alkanolamine of formula R&mdash;NH&mdash;(AOH) wherein R is hydrogen or a linear or branched aliphatic or cyclic C -C -alkyl group, and A is a C H -group or C H -group, alone or in combination with hydroxy compounds and/or ethers. Furthermore a method for the reduction of the dry shrinkage of binders such as cement, admixed cement, puzzolanas and thereof produced mortars and concretes by means of such a shrinkage reducing agent is described.

Method for the reduction of the degree of shrinkage of hydraulic binders

Cement dispersing polymers for high flow, high strength and selfcompacting concrete

Alkali-free setting and hardening accelerator

Described are liquid setting and hardening accelerators for hydraulic binders and such binder comprising mixtures that preferably are alkali-free and chloride-free and that do not comprise any basic features. The setting accelerators comprise as components aluminum salts, complexing agents, corrosion inhibitors and optionally inorganic and/or organic thickening or thixotropic agents. In comparison with the use of alkaline accelerators, an essential reduction in the setting time and a faster development of high compressive strengths is achieved by the accelerators of the present invention. In comparison with commercially available alkali-free accelerators solid precipitates of aluminum salts and thereby generated plugging up of the spray nozzles is avoided and the corrosion at the spraying devices is eliminated. Said advantages result in a great economic advantage due to less maintenance needed for the devices and less interruptions of work.

Stabilized setting and hardening accelerator of low viscosity

Method for rehabilitative and/or protective corrosion-inhibition of reinforcing steel embedded in a hardened structure by means of surface-applied corrosion-inhibiting compositions

One object of the present invention is an agent for the reduction of the degree of shrinkage in hydraulic binders, whereby said agent comprises an alkanolamine of formula R&mdash;NH&mdash;(AOH) wherein R is hydrogen or a linear or branched aliphatic or cyclic C -C -alkyl group, and A is a C H -group or C H -group, alone or in combination with hydroxy compounds and/or ethers. Furthermore a method for the reduction of the dry shrinkage of binders such as cement, admixed cement, puzzolanas and thereof produced mortars and concretes by means of such a shrinkage reducing agent is described.

A new category of multi-purpose polymers is presented, the polymers being capable to serve as a cement dispersing agent and which at the same time are set-accelerating and do have shrinkage reducing- and anticorrosive properties to steel. The polymers are ester and amide group-modified acrylic polymers, obtainable by a polymer analogous esterification of a polyacrylic acid with 1) a monofunctional polyalkyleneglycol-monoalkylether, 2) a tertiary alkanolamine and optionally 3) by amidation with a amino-polyalkylenglycol alkylether. The multi-purpose polymers serve for cement dispersing admixture for concrete with set accelerating, shrinkage compensating and anticorrosive properties to steel.

Multipurpose cement dispersing polymers for high flow and high strength concrete

Growing community of inventors

Geroldswil, Switzerland

Theodor A Bürge

Growing community of inventors

Geroldswil, Switzerland

Theodor A B&uuml;rge

Theodor A Bürge