Cementitious binders for geopolymer, geopolymers, and uses thereof
AssigneeSika Technology AG
InventorsNikitas Tsirigotis, Gary Boon, Mohamed Cader, Haripriya Nekkanti
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Abstract
Binders for geopolymers, which include: a) not less than 30 w % of a mixture of at least two chemically different aluminosilicates, b) not less than 20 w % of Ordinary Portland cement, and c) 8-20 w % of a mixture of calcium sulfoaluminate cement or calcium aluminate cement with a source of calcium sulfate, wherein in the mixture the weight ratio of calcium sulfate to calcium sulfoaluminate and/or calcium aluminate is between 0.08-1.5, preferably 0.3-1.1, more preferably 0.6-1.1. Also, geopolymers using such binders as well as their use in various construction methods.
Claims13
A cementitious binder for geopolymers, the cementitious binder comprising in each case relative to the total dry weight of cementitious binder
- a) not less than 30 w % of a mixture of at least two chemically different aluminosilicates, wherein a first aluminosilicate is steelmaking slag and further aluminosilicates are selected from fly ash of class F according to ASTM C618 and/or calcined clay, and wherein a weight ratio of the steelmaking slag to the fly ash, if present, is from 1.5:1 to 1:2 and a weight ratio of the steelmaking slag to the calcined clay, if present, is from 2:1 to 5:1,
- b) not less than 20 w % of Ordinary Portland cement,
- wherein a weight ratio of the Ordinary Portland Cement to the mixture of the at least two chemically different aluminosilicates is from 0.3 to 2, and
- c) 8-20 w % of a mixture of calcium sulfoaluminate cement or calcium aluminate cement with a source of calcium sulfate, wherein in the mixture the weight ratio of calcium sulfate to calcium sulfoaluminate and/or calcium aluminate is from 0.6 to 1.5.
Dependencies are inferred from the claim text.