Mbt Holding Ag

Helmut Gebhardt

Bernhard Leikauf

Terje Angelskar

Valentina Mader

Terye Angelskar

An accelerating admixture for use with spraying cementitious compositions such as shotcrete comprises (a) a compound selected from aluminium hydroxide, aluminium hydroxysulphate and mixtures thereof, and (b) an acidic substance which essentially does not react with the compound. The preferred acid substances are organic acids.

Concrete accelerators

An accelerating admixture for use with cementitious compositions, especially shotcrete, comprises aluminium sulphate and at least one alkanolamine. The admixture also preferably comprises an stabilising agent, which is preferably selected from aqueous stable polymeric dispersions and sepiolite magnesium silicate.

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Zurich, Switzerland

Helmut Gebhardt