A combination of retarders and regulators for hydration reaction of cementitious binders including clinkers based on Ye'elimite. Set retarders are calcium complexing agents, consisting of sugar acids, sugars, sugar alcohols, hydroxycarboxylic acids, phosphates, phosphonates, borates and amines. Regulator general formula (I) is

##STR00001##

where M is H, NH.sub.4 or chosen from monovalent or divalent metal of groups Ia, IIa, IIIa, Ib, IIb, IVb, VIb, VIIb or VIIIb of periodic table of elements, where M is a divalent metal, a second equivalent of R—SO.sub.3 is present, and M is chosen from group consisting of H, NH.sub.4, Li, Na, K, MgX, CaX, or NiX with X═RSO.sub.3, and R is chosen from H, NH.sub.2, OH or from hydrocarbon chain with 1-18 C atoms which may be substituted by N and/or O and/or which may be linear or branched and/or which contain one or more unsaturated bonds and/or cycloaliphatic and/or aromatic moieties.

Functionalized polyacrylate polymer compositions for treating clay or clay bearing aggregates compositions are disclosed. Also disclosed are methods for preparing the functionalized polyacrylate polymer compositions, admixtures containing such polymers and methods for the mitigation of clays in cementitious and aggregate compositions using these polymers.

A composition may be suitable for flowable refractory materials and include calcium aluminate cement, a filler, a plasticizer in the form of a copolymer comprising polyether side chains, and a retarder having at least one acid. An article may include such a composition.

A composition may be suitable for flowable refractory materials and include calcium aluminate cement, a filler, a plasticizer in the form of a copolymer comprising polyether side chains, and a retarder having at least one acid. An article may include such a composition.

The present invention relates to a copolymer, especially for use as a dispersant for solid particles, in particular for use as dispersant for mineral binder compositions, having a polymer backbone and side chains bonded thereto, comprising at least one ionizable monomer unit M1 and at least one side chain-bearing monomer unit M2, wherein the copolymer has a gradient structure in at least one section A in a direction along the polymer backbone with regard to the ionizable monomer unit M1 and/or with regard to the side chain-bearing monomer unit M2.

An admixture for a hydraulic composition includes a polycondensation product P containing a copolymer prepared by polycondensation of a monomer mixture containing compounds A to C of the following Formulae (A) to (C); and a polycarboxylic acid-based polymer Q including a structural unit having an amino and an imino group, and/or a structural unit having an amino, imino, and amido group: ##STR00001## (wherein R.sub.1 is a hydrogen atom, alkyl, or alkenyl group; A.sub.1O is a C.sub.2-4 alkylene oxide group; p is a number of 1 to 300; and X is a hydrogen atom, an alkyl, or acyl group; R.sub.2 is an alkyl or alkenyl group; A.sub.2O is a C.sub.2-4 alkylene oxide group; q is a number of 1 to 300; and Y.sub.1 is a phosphate ester group; and R.sub.3 is a hydrogen atom, carboxy, alkyl, alkenyl, phenyl, naphthyl, or heterocyclic group; and r is a number of 1 to 100).

The present invention discloses a multitype-adsorptive-group polycarboxylic acid water-reducing agent, consisting of 30-60 wt % of a macromolecule with multitype-adsorptive groups and water, the macromolecule with multitype-adsorptive groups has a polyethylene glycol side chain, and adsorption groups of the polymer backbone include a carboxylic acid group, a sulfonic acid group and a phosphoric acid group, the phosphoric acid group being linked to the backbone of the macromolecule with multitype-adsorptive groups by nucleophilic addition. The water-reducing agent of the present invention has significantly improved adaptability to different cements and aggregates while maintaining a high water reduction efficiency, compared with the conventional polycarboxylic acid water-reducing agent. It has a good water reducing efficiency in many different grades of cement, as well as a better resistance to aggregates containing more impurities such as machine-made sand.

A fluorescent polycarboxylate superplasticizer and a preparation method thereof. The preparation process of the polycarboxylate superplasticizer is as follows. Firstly, a redox radical polymerization is performed on a monomer of an unsaturated acid and a derivative thereof, and an unsaturated polyether monomer to form a polycarboxylate superplasticizer pre-product. Then, the polycarboxylate superplasticizer pre-product is subjected to an esterification reaction with an organic molecule having a fluorescent property to obtain the fluorescent polycarboxylate superplasticizer. The method effectively reduces the reaction difficulty and makes the reaction rapid and efficient. The fluorescent polycarboxylate superplasticizer is non-toxic and non-polluting, and has good controllability in the production process and less side reactions. The fluorescent polycarboxylate superplasticizer can be applied to different kinds of cement, having a high water-reducing rate, and a relatively high cost performance and competitive advantage.

The present invention provides a method and admixture composition for making hydratable cementitious compositions, ones believed to have much less stickiness in comparison to prior methods. Decreased stickiness in concrete mixes means that they are easier to pour or to cast into place, as well as easier to finish. Dispersant carboxylate polymers of the invention having this ability are characterized by possessing two different, relatively short chain lengths of polyalkyleneoxide units and low weight-average molecular weights.

The present invention provides a method and admixture composition for making hydratable cementitious compositions, ones believed to have much less stickiness in comparison to prior methods. Decreased stickiness in concrete mixes means that they are easier to pour or to cast into place, as well as easier to finish. Dispersant carboxylate polymers of the invention having this ability are characterized by possessing two different, relatively short chain lengths of polyalkyleneoxide units and low weight-average molecular weights.