A preparation method for a concrete additive for a maritime work environment includes: S1, compounding a volcanic ash material containing aluminum oxide and lime in proportion, loading a mixture into a sugar coating machine, and spraying a proper amount of alcohol, to prepare spherical particles; S2, adding the spherical particles in S1 and cement into the sugar coating machine, uniformly spraying deionized water in a rotating process, and coating surface layers of the spherical particles with a layer of cement for maintenance; and S3, placing the maintained particles in S2 into a hydrophobic emulsion, and coating the surface layers of the particles with a layer of hydrophobic emulsion, to obtain a concrete additive.

A method of pouring a body, including mixing an isocyanate, a polyol, and a catalyst to yield an admixture, dispersing a particulate phase in the admixture to yield a homogeneous composition, pouring the homogeneous composition into a preform, capping the preform to prevent expansion of the homogeneous composition thereoutof, and curing the homogeneous composition to yield a polymeric composite body. The matrix portion is formed from a polymerizable formulation comprising at least one isocyanate precursor, at least one polyol, and a catalyst contained in a mold having a pressure rating of at least 0.4 Mpa. The at least one isocyanate precursor is selected from the group consisting of polymethylene polyphenylisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, toluene diisocyanate and methyl diisocyanate (MDI), and combinations thereof. The catalyst is selected from the group consisting of a dialkyltin derivative, tributyl bismuth, and combinations thereof and is a tertiary amine.

The invention relates to a product and method for repair of roadway or pavement damage such as potholes, concrete/asphalt joints, and other damage to paved surfaces. The product can be adjusted in terms of the cure time of the product, allowing the user to customize the product for best use in the particular repair being made. Fast cures can be obtained of 5 minutes or less, suitable for quick repair of a small defect in pavement, or the cure time can be extended to 60 or more minutes, suitable for larger projects that can take many hours to complete. The product, when mixed, handles like easily pourable concrete mix, but acts like a hot mix repair when cured.

A concrete formulation system for repairing a cultural relic building and a use method thereof. The method includes obtaining a first index value, a second index value, and a third index value of a cultural relic building concrete sample and comparing the index values in a database of the concrete formulation system to obtain raw material components and contents of an original preparation formula of cultural relic concrete. The method further includes preparing a repairing concrete sample, measuring the index values, of the repairing concrete sample and comparing the index values of the cultural relic building concrete sample, and if the result is that the difference between the first index values is not greater than 20%, the difference between the second index values is not greater than 60%, and the difference between the third index values is not greater than 60%, using the repairing concrete sample for cultural relic repair.

A method for controlling the volume expansion of a hydraulically setting composition including steel making slag, the method including a step of adding a silica source to the composition. Furthermore, hydraulically setting compositions obtained by such methods and their uses.

The present invention relates to a construction material composition comprising at least one non-ionic copolymer and the use of said construction material composition. Further, the present invention relates to a non-ionic copolymer and the use thereof for modifying robustness against clay deviations.

Methods and compositions are described for concrete repair using a non-naturally occurring or a synthetic catalyst. The catalyst includes an aromatic hydrocarbon having an active zinc ion configured to facilitate interaction between carbon dioxide and water and to precipitate concrete repairing calcium carbonate crystals. The catalyst is an analog of zinc cyclen, zinc and an indole-based molecule, and zinc tris(2-pyridylmethyl)amine (TPA).

The present invention relates to a process for producing a redispersible dispersion powder, to the redispersible dispersion powder obtainable by this process, to an aqueous dispersion obtainable by step (1) of this process, and to a building material composition comprising the redispersible dispersion powder and/or the aqueous dispersion, to the use of the redispersible dispersion powder in a building material composition and to the use of the aqueous dispersion for production of a redispersible dispersion powder.

An activating composition, in particular for concrete or industrial mortars containing hydraulic binder and/or pozzolanic material, comprises at least 40% by weight, preferably at least 50% by weight of calcium carbonate and/or magnesium carbonate particles having a d80 less than or equal to 15 .Math.m, and a d50 less than or equal to 4 .Math.m, and at least 1.5% by weight and up to 60% by weight of at least one alkaline metal salt. A binder composition is also provided, the binder composition comprising the activating composition and a component C comprising at least one hydraulic binder. The binder composition and at least one aggregate are combined to form a dry concrete or industrial mortar composition. Also provided is a process for preparing wet concrete or mortar compositions and hardened concrete or industrial mortar compositions obtained therefrom.

The invention concerns a method for fluidifying wet concrete or industrial mortar compositions comprising: (a) at least one hydraulic binder, (b) at least one water reducing polymer, (c) at least one accelerator in the form of a salt containing at least one kosmotropic ion, (d) water, and (e) possibly one or more supplementary cementitious materials, and (f) possibly one or more filler materials, the method comprising a step of adding at least one salt (ch) including at least one chaotropic ion to the concrete or industrial mortar composition.