US 7,575,630 B2 · Binder admixture, kaolin product and their manufacture

Abstract

A binder mix containing a hydraulic binding agent and an admixture mixed therewith, a process for preparing a hydraulically hardened binder mass, a calcinated kaolin product and a process for preparing the same. A paste-like composition is formed from the hydraulically hardening binding agent, a pozzolanically reacting admixture and water, which, when so desired, contains stone aggregate or similar filler, the paste-like composition is worked and the worked composition is allowed to harden to form the binder mass. The admixture comprises spherical, porous metakaolin agglomerates, the size of which is 2-200 microns and which have an open pore structure. The invention can be used to improve the manufacturing methods of cast concrete products and shorten the manufacturing times, and to provide concrete with better mechanical and chemical properties, as well as improve the fire and frost resistance of concrete.

Claims18

Dependent claims

A mix containing a hydraulically hardening binder and a pozzolanically reacting admixture, the pozzolanically reacting admixture comprising spherical, porous calcined agglomerates, said agglomerates being formed prior to calcination, said calcined agglomerates at least partly consisting of metakaolin particles;

and
whereby the size of individual agglomerates is 2-200 microns.

A process for preparing a hydraulically hardened binder mass, comprising:

forming a paste-like composition from a hydraulically hardening binder, a pozzolanically reacting admixture and water, which, when so desired, contains stone aggregate or similar filler;
using spherical, porous agglomerates, which at least partially consist of metakaolin particles, as the pozzolanically reacting admixture;
processing the paste-like composition;
allowing the worked composition to harden to form the binder mass;
wherein the spherical, porous agglomerates having an individual agglomerate size of 2-200 microns are used as the pozzolanically reacting admixture, whereby the density of the surface part of individual agglomerates is lower than that of the inner part and the pore structure of individual agglomerates in the surface part and the inner part is essentially the same;
and
the difference between the amount of water required by the workability of the paste formed from the binder and the admixture and the smaller amount of water required by the hydration reactions is stored in a reversible way, after processing the binder paste, in the pore structure of the said spherical, porous agglomerates and returned in subsequent hardening phases of the binder paste.

4 more elements

Dependencies are inferred from the claim text.

Binder admixture, kaolin product and their manufacture

Life of this patent

Binder admixture, kaolin product and their manufacture

Life of this patent

Abstract

Claims18