An anticorrosive composition comprising (a) one or more alkali metal silicate components of the formula Me.sub.2O.Math.xSiO.sub.2, wherein x has a value of from 0.5 to 4.0, (b) one or more alkali metal phosphate components of the formula Me.sub.2O:nP.sub.2O.sub.5, wherein n has a value of from 0.33 to 1 and/or hydrates thereof, (c) one or more carboxylic acids having 6-22 carbon atoms and/or salts thereof: and the use of the composition for imparting anticorrosive properties to a material such as a mineral wool product.

A core wall-thinning design method for a prestressed high-performance concrete cylinder pipe is provided. The PCCP uses high-performance concrete, which includes P.O 42.5 or P.O 52.5 portland cement, river sand, mineral powder, fly ash, silica fume, steel fibers, polypropylene fibers, a high-efficiency polycarboxylate superplasticizer, and superabsorbent resin, and which is prepared by: adding all cementitious materials, sand and superabsorbent resin for mixing until uniform dispersion; dissolving the superplasticizer in water, and adding the superplasticizer dissolved in water and evenly stirring; and evenly adding steel fibers and polypropylene fibers and evenly stirring. The compressive strength and the tensile strength of the high-performance concrete are increased. A core wall-thinning design method, includes: establishing an axisymmetric double-layer ring plane strain model, to analyze radial displacement and circumferential stress of an outer ring and an inner ring of the PCCP, and then deriving a calculation formula of the wall-thinning design.

The present invention relates to an anticorrosive composition and the use of such a composition for imparting anticorrosive properties to a material, and a material comprising such a composition.