The invention relates to a polymer which is obtainable by copolymerizing monomers comprising at least one ethylenically unsaturated monomer which comprises at least one acid group and at least one ethylenically unsaturated monomer (II) having polyether groups with 5 to 35 repeating units and at least one ethylenically unsaturated monomer (III) having polyether groups with 45 to 150 repeating units, the molar ratio of monomer (II) to monomer (III) being between 75:25 and 99.5:0.5. Further disclosed are the use of the polymer of the invention as an admixture for inorganic binder compositions, and a composition in powder form comprising an inorganic binder and the polymer of the invention.

A method for the manufacture of a high alumina hydraulic binder comprising hydrating a source of aluminium ions with a source of calcium ions in the presence of water to form mineral hydrates and subsequently heating said mineral hydrates to form said high alumina hydraulic binder.

A method for the manufacture of a high alumina hydraulic binder comprising hydrating a source of aluminium ions with a source of calcium ions in the presence of water to form mineral hydrates and subsequently heating said mineral hydrates to form said high alumina hydraulic binder.

The present invention is directed to a pozzolanic mixture used as a supplementary cementitious material (SCM) comprising an activated clay, a limestone and a setting regulator. Moreover, it is also directed to a cementitious composition comprising said pozzolanic mixture, a clinker and a setting regulator. Finally, the invention is also directed to a concrete comprising the cementitious composition described above, fine aggregate, coarse aggregate and water, optionally the concrete may have other additives.

The present disclosure is directed to a method of manufacturing gypsum board as well as the resulting gypsum board. The method comprises providing a gypsum slurry with a shrinkage-reducing additive comprising a metal salt of an acid, a silica, or a mixture thereof. As a result, the gypsum board includes gypsum and a shrinkage-reducing additive comprising a metal salt of an acid, a silica, or a mixture thereof. The gypsum board exhibits an area shrinkage of less than 10%.

A cement admixture containing free lime, gypsum, Ye’elimite, and ternesite, wherein the cement admixture has a mass ratio of the Ye’elimite to the ternesite (Ye′elimite/ternesite) of from 0.5 to 40. The cement admixture contains 20 to 80 mass% of the free lime. The cement admixture has a total mass ratio of the free lime and the gypsum anhydride to the ternesite ((free lime + gypsum anhydride)/ternesite) from 20 to 90. An expansive material which contains the cement admixture. A cement composition which contains the cement admixture.

A cement admixture containing free lime, gypsum, Ye’elimite, and ternesite, wherein the cement admixture has a mass ratio of the Ye’elimite to the ternesite (Ye′elimite/ternesite) of from 0.5 to 40. The cement admixture contains 20 to 80 mass% of the free lime. The cement admixture has a total mass ratio of the free lime and the gypsum anhydride to the ternesite ((free lime + gypsum anhydride)/ternesite) from 20 to 90. An expansive material which contains the cement admixture. A cement composition which contains the cement admixture.

The present invention relates to a construction chemical composition, comprising a) at least one inorganic binder, b) less than 0.5 weight-%, based on the total amount of a), b) and c), of at least one compound of the general formula (I) and at least c) one alkali metal carbonate. Further the use of a hydration control mixture as a retarder for at least one inorganic binder, comprising an aluminate-containing binder is disclosed.

The present invention relates to a construction chemical composition, comprising a) at least one inorganic binder, b) less than 0.5 weight-%, based on the total amount of a), b) and c), of at least one compound of the general formula (I) and at least c) one alkali metal carbonate. Further the use of a hydration control mixture as a retarder for at least one inorganic binder, comprising an aluminate-containing binder is disclosed.

Mineral fines reduce OPC content in concrete, mortar and other cementitious compositions, typically in combination with a pozzolanically active SCM. Mineral fines can replace and/or augment a portion of hydraulic cement and/or fine aggregate. Mineral fines can replace a portion of cement binder and fine aggregate as an intermediate that fills a size void between largest cement particles and smallest fine aggregate particles. Supplemental lime can enhance balance of calcium ions in the mix water and/or pore solution. Supplemental sulfate can address sulfate deficiencies caused by high clinker reduction, use of water reducers and/or superplasticizers, and SCMs containing aluminates. Concentrated or pure carbon dioxide (CO.sub.2) can be used to passivate alkaline values in highly alkaline materials, such as concrete washout fines, CKD, class C flyash, incinerator ash, bottom ash, or biomass ash. CO.sub.2 passivation or sequestration can be carried out before, during or after forming an initial concrete mix.