Cementitious compositions comprising oxidatively degraded polysaccharide as water reducing agents
AssigneeSika Technology AG
InventorOttavio ROMBOLA
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Abstract
Cementitious compositions and methods for the preparation of corresponding cementitious compositions, appropriate oxidatively degraded polysaccharides and methods for producing the same, as well as the use of oxidatively degraded polysaccharides as water reducing agents in cementitious compositions, wherein the compositions include an oxidatively degraded polysaccharide as a water reducing agent to provide similar water reducing properties to cementitious composition formulated with lignosulfonates. The oxidatively degraded polysaccharides have the advantage over lignosulfonates of a lower price and a more consistent quality and are expected to be compatible with polycarboxylatether cement additives.
Claims16
A cementitious composition comprising an oxidatively degraded polysaccharide as a water reducing agent, wherein the oxidatively degraded polysaccharide is obtained by subjecting a base polysaccharide to oxidative treatment, and optionally after an initial reaction time an alkaline agent is added to the reaction mixture.
A method for the preparation of a cementitious composition comprising
- (i) subjecting a base polysaccharide to oxidative degrading conditions,
- (ii) optionally adding an alkaline agent after an initial reaction time, and
- (iii) adding the thus obtained oxidatively degraded polysaccharide to a composition comprising cement.
An oxidatively degraded polysaccharide obtainable by (i) subjecting a base polysaccharide to oxidative degrading conditions and optionally (ii) adding an alkaline agent and continuing the oxidative degradation.
Dependencies are inferred from the claim text.