Providing a multi-functional group superplasticizer for an ultra-high performance concrete and a method for preparing the same. Its backbone is an alkyl chain, and its side chain are some side chains with carboxylic acid or carboxylate at terminals, some polyether side chains, and some polyol amine side chains substituted with phosphoric acid or phosphite at terminals, the polyol amine side chains substituted with phosphoric acid or phosphite at terminals is connected to the backbone through a phenyl or an alkyl group of 1-9 carbons, and a ratio of a number of the side chains with carboxylic acid or carboxylate at terminals to a total number of side chains is ≥0 and ≤0.8; and a ratio of a number of the polyether side chains to the total number of side chains is ≥0.1 and ≤0.9.

Provided are a gypsum set accelerator wherein the gypsum set accelerator is a dry-milled mixture comprising calcium sulfate dihydrate co-ground with one or more of the following: a polycarboxylic ether (PCE) and/or a sulfonated melamine polycondensate (SMP), gypsum slurries formulated with the gypsum set accelerator and methods for producing the gypsum set accelerator and manufacturing gypsum products with the gypsum set accelerator.

A process for the reduction of the content of a compound I of general formula (II)

##STR00001##

where R1 is hydrogen or methyl, each R2, independently from each other, is hydrogen or methyl, R3 is hydrogen or an aliphatic or cycloaliphatic or aromatic hydrocarbon with 1-8 carbon atoms, AO is a C2-C12 oxyalkylene group, x=0 or 1, and n=2-350, from a mixture including or consisting of a compound I of general formula (II) and an alkoxylated alcohol A of general formula (I)

##STR00002##

where R1, R2, R3, AO, x, and n are as described in general formula (II) above, characterized in that the process includes a treatment of the mixture including or consisting of a compound I and an alkoxylated alcohol A with an acid. Also, the use of the alkoxylated alcohols A for the production of polycarboxylate ethers.

The present invention relates to an additive for hydraulically setting compositions comprising a colloidally disperse preparation comprising at least one salt of a polyvalent metal cation with at least one organic phosphonate and/or phosphate compound as anion and at least one polymeric dispersant comprising anionic and/or anionogenic groups and polyether side chains. The additive is especially suitable as slump retainer and for improving early strength.

The present invention relates to an additive for hydraulically setting compositions comprising a colloidally disperse preparation comprising at least one salt of a polyvalent metal cation with at least one organic phosphonate and/or phosphate compound as anion and at least one polymeric dispersant comprising anionic and/or anionogenic groups and polyether side chains. The additive is especially suitable as slump retainer and for improving early strength.

The present application relates to an additive component comprising a component A and a component B, wherein component A comprises at least one hardening retarder selected from glyoxylic acid, salts thereof, condensation or addition products of glyoxylic acid or salts thereof, and mixtures thereof, and component B comprises at least one hardening accelerator selected from calcium-silicate-hydrate, calcium formate, calcium nitrate, calcium chloride, calcium hydroxide, lithium carbonate, lithium sulfate, potassium sulfate, sodium sulfate, ground gypsum, and combinations thereof, in 3D printing of a construction material composition.

The present application relates to an additive component comprising a component A and a component B, wherein component A comprises at least one hardening retarder selected from glyoxylic acid, salts thereof, condensation or addition products of glyoxylic acid or salts thereof, and mixtures thereof, and component B comprises at least one hardening accelerator selected from calcium-silicate-hydrate, calcium formate, calcium nitrate, calcium chloride, calcium hydroxide, lithium carbonate, lithium sulfate, potassium sulfate, sodium sulfate, ground gypsum, and combinations thereof, in 3D printing of a construction material composition.

This document relates to methods for improving the tensile and elastic properties of cement of an oil well using cement compositions that contain sliding-ring polymer additives. The cement compositions containing the sliding-ring polymer additives exhibit increased stiffness while having a minimum impact on compressive strength, as compared to the same cement without the sliding-ring polymer additive.

The invention relates to an admixture for a cementitious material suitable to influence the rheological properties of the cementitious material. The admixture comprises a compound having a backbone chain provided with at least one first functionality and at least one second functionality. The at least one first functionality is adapted to adsorb to the cement particles of the cementitious material. The at least one second functionality is adapted to respond to an external trigger signal of an electric field, a magnetic field or an electromagnetic field, thereby influencing the rheological properties of the cementitious material. The rheological properties are influenced by influencing the interaction of the at least one first functionality with the cement particles and/or by influencing the interparticle interaction between the cement particles.

The invention further relates to a cementitious material comprising such admixture. Furthermore, the invention relates to a method and a system to control or influence the rheological properties of a cementitious material.

The invention relates to an admixture for a cementitious material suitable to influence the rheological properties of the cementitious material. The admixture comprises a compound having a backbone chain provided with at least one first functionality and at least one second functionality. The at least one first functionality is adapted to adsorb to the cement particles of the cementitious material. The at least one second functionality is adapted to respond to an external trigger signal of an electric field, a magnetic field or an electromagnetic field, thereby influencing the rheological properties of the cementitious material. The rheological properties are influenced by influencing the interaction of the at least one first functionality with the cement particles and/or by influencing the interparticle interaction between the cement particles.

The invention further relates to a cementitious material comprising such admixture. Furthermore, the invention relates to a method and a system to control or influence the rheological properties of a cementitious material.