Methods for the control of shrinkage of cementitious compositions and cementitious grouts having controlled shrinkage
AssigneeSika Technology AG
InventorJuan Antonio CALAMA
Life of this patent
Estimating the term…
Abstract
A method for the control of the shrinkage of cementitious materials, the method comprising the steps of providing a cementitious material, adding aluminium powder to the cementitious material, adding calcium oxide or magnesium oxide to the cementitious material, and adding a shrinkage reducing agent which is an organic molecule to the cementitious material. Cementitious grouts including aluminium powder, calcium oxide or magnesium oxide, and a shrinkage reducing agent which is an organic molecule.
Claims15
A method for the control of the shrinkage of cementitious materials, the method comprising the steps of
- (i) providing a cementitious material,
- (ii) adding aluminium powder to the cementitious material,
- (iii) adding calcium oxide or magnesium oxide to the cementitious material,
- (iv) adding a shrinkage reducing agent which is an organic molecule to the cementitious material,
- wherein the cementitious material has a density of not less than 800 kg/m3 after hardening.
A cementitious grout comprising or consisting of (in each case relative to the total dry weight of the cementitious grout)
- a) 10-80 w % of a cementitious binder, the cementitious binder comprising cement and slag,
- b) 0.0001-0.01 w % of aluminium powder,
- c) 0.3-2 w % of calcium oxide or magnesium oxide,
- d) 0.03-1 w % of a shrinkage reducing agent which is an organic molecule,
- e) 10-80 w % relative to the dry weight of the grout of at least one aggregate and/or filler,
- f) 0.001-0.1 w % of azodicarbonamide, and
- g) further additives.
An admixture for cementitious compositions the admixture comprising aluminium powder, calcium oxide or magnesium oxide, and a shrinkage reducing agent which is an organic molecule.
Dependencies are inferred from the claim text.