Anticorrosive agent for concrete and anticorrosive concrete

Abstract

The invention provides an anticorrosive agent for concrete. The anticorrosive agent is a mixture of powder selected from the group consisting of fly ash, blast-furnace water-quenched slag powder, silica fume, light-burnt metakaolin powder, phosphorus slag powder, alum slag powder, natural zeolite powder and the like and a barium compound selected from the group consisting of barium chloride, barium nitrate, barium acetate, barium hydroxide, barium sulfide and the like. The anticorrosive agent for concrete provided by the invention enables Ca(OH)2 by-produced in hydration of cement to bond with SiO2 included in cement so as to produce secondary hydrated calcium silicate, so the strength and impermeability of concrete are improved; barium ions doped into concrete reacts with SO4<2-> from the outside in time to produce inertial and stable secondary barite, so deionization of SO4<2-> is realized and corrosivity of SO4<2-> is eradicated; the secondary barite forms a stable mineral inorganic protection film on the surface layer of concrete, so further invasion of external harmful ions is prevented, the strength, impermeability and corrosion resistance of concrete are further improved, the service life of concrete is substantially prolonged, and economic benefits are increased.

Description

technical field [0001] The invention relates to an anti-corrosion agent belonging to building materials, in particular to a concrete anti-corrosion agent and anti-corrosion concrete (including anti-corrosion concrete prefabricated components) prepared therefrom. technical background [0002] Concrete sulphate erosion has been a long-standing problem in the construction industry, and the case reports of concrete engineering suffering from saline-alkali erosion in coastal and arid saline-alkaline areas have also increased greatly in recent years. Especially after several major earthquakes in recent years, some national authorities have revised and released a series of engineering specifications and product standards: for example, China's GB50011 (Code for Seismic Design of Construction Engineering), GB50476 (Code for Durability of Concrete), GB50082 / T (specification method for concrete durability testing) GB748 (standard for sulfate-resistant cement), JC / T1011 (standard for c...

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Problems solved by technology

[0011] After long-term observation, research and analysis, the inventor found that the sulfate-resistant cement that only controls the aluminum content has little effect on the prevention and treatment of brucite and molarite.

And use cement expansion agent and more fly ash or water-quenched blast furnace slag powder, silica fume, etc. in order to make Ca(OH) as much as possible 2 Converted to calcium silicate hydrate, its anti-corrosion coefficient K value is still hovering between 80-90%, still can not achieve the purpose of radically curing sulfate corrosion

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