A kind of concrete anti-freezing and carbonation protection layer of sandwich structure and its preparation method

By designing a sandwich-like concrete protective layer, the problem of insufficient protection of existing concrete protective layers in complex environments is solved, the freeze-thaw resistance and carbonation resistance are improved, the construction process is simplified, and the interfacial bonding strength and compatibility are enhanced.

CN118995037BActive Publication Date: 2026-07-21BEIJING ACAD OF BUILDING ENG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING ACAD OF BUILDING ENG
Filing Date
2024-09-24
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing concrete protective layers are insufficient in protecting against erosion in complex environments, especially against freeze-thaw cycles and carbonation. They also have poor interfacial bonding, are complex to construct, and have limited compatibility and long-term stability among their components.

Method used

The concrete freeze-thaw and carbonation-resistant protective layer with a sandwich-like structure includes a surface layer of silane-functionalized fluorinated carbon-modified poly(dimethylsiloxane)urea resin, a middle layer of silane-functionalized montmorillonite-modified poly(dimethylsiloxane)urea resin, and a bottom layer of polyol-modified poly(dimethylsiloxane)urea resin. The overall performance is improved through the synergistic effect of each layer.

Benefits of technology

It significantly improves the freeze-thaw resistance and carbonation resistance of concrete, extends the service life of the structure, simplifies the construction process, enhances the interfacial bonding and compatibility, and provides multiple protection mechanisms.

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Abstract

The application discloses a kind of concrete freeze-thaw resistance and carbonation resistance protective layer of sandwich structure and preparation method thereof.The protective layer includes three functional layers: surface layer is silane functionalized fluorine carbon modified poly (dimethylsiloxane) urea resin layer, middle layer is silane functionalized montmorillonite modified poly (dimethylsiloxane) urea resin layer, bottom layer is polyol modified poly (dimethylsiloxane) urea resin layer.The preparation method of the application includes the synthesis of poly (dimethylsiloxane) urea resin, the preparation of functionalized additive, and three-layer protective layer is coated and cured layer by layer.The protective layer structure significantly improves the freeze-thaw resistance and carbonation resistance of concrete, effectively slows down the degradation of concrete mechanical properties, and the application provides a new technical solution for improving the durability of concrete structure, and has wide application prospect.
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