Method and a composition for preparing a shaped article
First Claim
1. A method for preparing a shaped article with a binder matrix prepared from a mix consisting essentially of a Portland cement, a fine silica-rich powder, water and a concrete superplasticizer, in the proportions of at least 0.1 part of the silica-rich powder, up to 0.35 part water, and from 0.01 to 0.04 part of the concrete superplasticizer dry matter per part by weight of the mixture of the cement and silica-rich powder, the method comprising(a) selecting the cement and fine silica-rich powder by measuring the contents of water-soluble Na and K in the cement and the fine silica-rich powder, calculating the contents of water-soluble Na and K as Na2 O-equivalents, and selecting a cement and a fine silica-rich powder that will result in a content of water-soluble alkali metal in the mix originating from the cement or the fine silica-rich powder of at the most 0.30%, calculated as Na2 O equivalents, based on the weight of the cement in the mix,(b) preparing a mix comprising the cement, the fine silica-rich powder, water, and a concrete superplasticizer,(c) arranging the mix in a shaped configuration and allowing the mix to solidify.
1 Assignment
0 Petitions
Accused Products
Abstract
A shaped article with a binder matrix based on cement is prepared from a mix comprising the cement, water, and a concrete super-plasticizer, the weight ratio between the water and the cement being at the most 0.30, preferably at the most 0.25, arranging the mix in the desired configuration and allowing the mix to solidfy, in which mix the weight amount of water-soluble alkali in the mix originating from the mineral solids in the mix is reduced to at the most 0.30%, preferably at the most 0.25%, more preferably at the most 0.20%, calculated as Na2 O equivalents, relative to the weight of the cement in the mix. The mix preferably further contains a fine silica-rich powder. The mix has an advantageously high fluidity rendering it useful for the preparation of shaped articles.
71 Citations
48 Claims
-
1. A method for preparing a shaped article with a binder matrix prepared from a mix consisting essentially of a Portland cement, a fine silica-rich powder, water and a concrete superplasticizer, in the proportions of at least 0.1 part of the silica-rich powder, up to 0.35 part water, and from 0.01 to 0.04 part of the concrete superplasticizer dry matter per part by weight of the mixture of the cement and silica-rich powder, the method comprising
(a) selecting the cement and fine silica-rich powder by measuring the contents of water-soluble Na and K in the cement and the fine silica-rich powder, calculating the contents of water-soluble Na and K as Na2 O-equivalents, and selecting a cement and a fine silica-rich powder that will result in a content of water-soluble alkali metal in the mix originating from the cement or the fine silica-rich powder of at the most 0.30%, calculated as Na2 O equivalents, based on the weight of the cement in the mix, (b) preparing a mix comprising the cement, the fine silica-rich powder, water, and a concrete superplasticizer, (c) arranging the mix in a shaped configuration and allowing the mix to solidify.
-
23. A method for preparing a shaped article with a binder matrix shaped from a mix consisting essentially of a Portland cement, a fine silica-rich powder, water and a concrete superplasticizer, in the proportions of at least 0.1 part of the silica-rich powder, up to 0.35 part water, and from 0.01 to 0.04 part of the concrete superplasticizer dry matter per part by weight of the mixture of the cement and silica-rich powder, comprising
(a) preparing a mix comprising the cement, the fine silica-rich powder, water, and a concrete superplasticizer, (b) reducing the content of water-soluble alkali metal in the mix originating from the cement or the fine silica-rich powder to at the most 0.30%, calculated as Na2 O equivalents, based on the weight of the cement, by adding to the mix or to any of the constituents of the mix a compound selected from the group consisting of (1) a water-soluble salt comprising non-alkali metal cations capable of forming a substantially insoluble precipitate with sulphate ions, (2) an acid capable of forming a soluble calcium salt, and (3) a salt comprising non-alkali metal cations and capable of forming a soluble calcium salt by reaction with calcium hydroxide, and (c) arranging the mix in a shaped configuration and allowing the mix to solidify.
-
47. A dry mix for preparing a shaped article with a binder matrix based on cement and fine silica-rich powder, the mix consisting essentially of a Portland cement, a fine silica-rich powder and a concrete superplasticizer, in the proportions of at least 0.1 part of the silica-rich powder and from 0.1 to 0.04 part of the concrete superplasticizer dry matter per part by weight of the mixture of the cement and silica-rich powder;
- the mix being adapted to be prepared in admixture with water in a weight ratio between water and cement plus fine silica-rich powder of at the most 0.35, the mix further comprising (1) a water-soluble salt comprising non-alkali metal cations capable of forming a substantially insoluble precipitate with sulphate ions, (2) an acid capable of forming a soluble calcium salt, or (3) a salt comprising non-alkali metal cations, said salt being capable of forming a soluble calcium salt by reaction with calcium hydroxide, whereby the amount of water-soluble alkali metal in the mix originating from the cement or the fine silica-rich powder is at the most 0.30%, calculated as Na2 O equivalents, based on the weight of the cement in the mix.
-
48. A wet mix for preparing a shaped article with a binder matrix based on cement and fine silica-rich powder, the mix consisting essentially of a Portland cement, a fine silica-rich powder, water and a concrete superplasticizer, in the proportions of at least 0.1 part of the silica-rich powder, up to 0.35 part water, and from 0.01 to 0.04 part of the concrete superplasticizer dry matter per part by weight of the mixture of the cement and silica-rich powder, the mix further comprising (1) a water-soluble salt comprising non-alkali metal cations capable of forming a substantially insoluble precipitate with sulphate ions, (2) an acid capable of forming a soluble calcium salt, or (3) a salt comprising non-alkali metal cations, said salt being capable of forming a soluble calcium salt by reaction with calcium hydroxide, whereby the amount of water-soluble alkali metal in the mix originating from the cement or the fine silica-rich powder is at the most 0.30%, calculated as Na2 O equivalents, based on the weight of the cement in the mix.
Specification