A process for the production of a mineral foam includes separately preparing a slurry of cement and an aqueous foam, wherein the cement slurry includes water and Portland cement as well as calcium silicate hydrate crystallization seeds; contacting the slurry of cement with the aqueous foam to obtain a slurry of foamed cement; and casting the slurry of foamed cement and leave it to set.

A process for producing a setting and/or curing accelerator for mineral binders is characterized in that a mineral solid is subjected to milling in a liquid medium.

A curing accelerator composition for building chemical mixtures comprises a mineral constituent and a polymeric water-soluble dispersant. The mineral constituent comprises a semi-ordered calcium silicate hydrate having an apparent crystallite size of 15 nm or less and less than 35% by weight of crystalline phases other than the semi-ordered calcium silicate hydrate. The composition displays a more pronounced accelerating effect than comparative compositions in which the mineral component comprises a calcium silicate hydrate having a higher degree of crystallinity.

A curing accelerator composition for building chemical mixtures comprises a mineral constituent and a polymeric water-soluble dispersant. The mineral constituent comprises a semi-ordered calcium silicate hydrate having an apparent crystallite size of 15 nm or less and less than 35% by weight of crystalline phases other than the semi-ordered calcium silicate hydrate. The composition displays a more pronounced accelerating effect than comparative compositions in which the mineral component comprises a calcium silicate hydrate having a higher degree of crystallinity.

The invention relates to a process for producing a composition suitable as accelerator for the curing of cement, by contacting the components aa) at least one component selected from the series of hydraulic binders and/or latent hydraulic binders, and bb) at least one dispersant suitable for the dispersing of inorganic particles in water, and cc) water, the weight ratio of components aa) to cc) being between 1.5:1 and 1:70, wherein the rate ratio of components aa) to bb) is between 20:1 and 1:2. In addition, the use of the composition obtained as hardening acceleration for chemical mixtures in construction is disclosed.

The invention relates to a process for producing a composition suitable as accelerator for the curing of cement, by contacting the components aa) at least one component selected from the series of hydraulic binders and/or latent hydraulic binders, and bb) at least one dispersant suitable for the dispersing of inorganic particles in water, and cc) water, the weight ratio of components aa) to cc) being between 1.5:1 and 1:70, wherein the rate ratio of components aa) to bb) is between 20:1 and 1:2. In addition, the use of the composition obtained as hardening acceleration for chemical mixtures in construction is disclosed.

The invention relates to a method for producing a calcium silicate hydrate-comprising hardening accelerator in powder form, which comprises the steps of (a) providing an aqueous suspension comprising calcium silicate hydrate; (b) mixing at least one calcium compound, selected from calcium acetate, calcium formate, calcium hydroxide, calcium oxide, and mixtures of two or more of said compounds, with the aqueous suspension comprising calcium silicate hydrate; and (c) drying the resulting mixture. The invention also relates to the hardening accelerator obtainable by this method, to the use thereof, and to building material mixtures which comprise the hardening accelerator.

The invention relates to a method for producing a calcium silicate hydrate-comprising hardening accelerator in powder form, which comprises the steps of (a) providing an aqueous suspension comprising calcium silicate hydrate; (b) mixing at least one calcium compound, selected from calcium acetate, calcium formate, calcium hydroxide, calcium oxide, and mixtures of two or more of said compounds, with the aqueous suspension comprising calcium silicate hydrate; and (c) drying the resulting mixture. The invention also relates to the hardening accelerator obtainable by this method, to the use thereof, and to building material mixtures which comprise the hardening accelerator.

Fibers with crystallization seeds attached to its surface, method of making such composite fibers by surface treatment of fibers followed by either treating such fibers with premade crystallization seeds or by precipitation and direct crystallization of seeds onto pretreated fibers. Controlling and tuning the properties of inorganic binder compositions with fiber-bound crystallization seeds and thereby generating inorganic binder compositions with tailor-made characteristics.

A nanoparticle suitable for early strength development of concrete and a method for producing the same are disclosed. Composition containing the nanoparticles is also disclosed. The nanoparticle can be produced by a co-precipitation process, and have different early strength enhancing effects. Thus, the nanoparticle and the composition containing the nanoparticle can be used as an early strength agent for accelerating early strength development of concrete.