USE OF A CEMENTITIOUS MIXTURE COMPRISING DIVALENT MAGNESIUM-IRON SILICATE FOR MAKING CONCRETE STRUCTURES WITH REDUCED PERMEABILITY AND METHOD FOR MAKING SUCH A STRUCTURE

摘要

The invention relates to the use of a cementitious mixture that comprises a) cementitious materials; b) one or more divalent magnesium-iron silicate that in neutral or basic aqueous solutions have the capacity to be a latent hydraulic binder comprising 2 - 99% of divalent magnesium-iron silicate by weight of total hydraulic solid materials; to make a cementitious structure for preventing gas transfer between a first region and a second region. and to a method to make a cementitious structure for preventing gas transfer between a first region and a second region comprising the steps of: a) mixing cementitious materials with a cement additive that comprises an admixture of one or more of divalent magnesium-iron silicates with the capacity to act as a latent hydraulic binder to a cement mixture, said cement additive comprises 2 - 99%, of divalent magnesium-iron silicate by weight of total hydraulic solid materials; c) blending the cementitious mixture to a neutral or basic slurry by the addition of water d) forming a structure, between the two regions, from the cement slurry, e) allowing the structure to set.