A method for improving the durability of commercial concrete based on modified aggregate

By combining vacuum impregnation and static curing with surface sealing treatment using low-melting-point materials, the durability problem of porous aggregate concrete is solved, the resistance to chloride ion penetration, freeze-thaw resistance and steel reinforcement corrosion prevention are improved, and the bond between aggregate and cement paste is improved, making it suitable for industrial production.

CN122355649APending Publication Date: 2026-07-10LUZHOU LINGANG INDUSTRIALIZED BUILDING TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-11
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively improve concrete's resistance to chloride ion penetration, freeze-thaw resistance, and steel reinforcement corrosion resistance while simultaneously reducing costs and achieving resource recycling through porous aggregates, and to ensure good bonding between aggregates and cement paste.

Method used

The porous aggregate is filled with a functional impregnating liquid through vacuum impregnation, and after static curing, a closed layer is formed. Before the closed layer cools down, fine sand is sprinkled to form a rough interface. The surface is then sealed with a low-melting-point material to prepare modified aggregate, which is then mixed with cement and other materials for use.

Benefits of technology

It significantly improves the chloride ion penetration resistance, freeze-thaw resistance, and rust prevention ability of concrete, while maintaining good bonding between aggregates and cement paste. It is suitable for various porous aggregates and rust inhibitors and is suitable for industrial production.

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Abstract

This invention discloses a method for improving the durability of ready-mixed concrete based on modified aggregates, belonging to the field of building materials technology. It aims to solve the problems of poor durability in existing ready-mixed concrete using porous aggregates, such as chloride ion penetration, freeze-thaw damage, and steel corrosion due to the high porosity and strong water absorption of the aggregates. The method includes: immersing the porous aggregates in a functional impregnation liquid prepared from a rust inhibitor and nano-silica or silica sol, allowing the impregnation liquid to fully fill the aggregate pores; after drying, immersing them in a molten low-melting-point sealing material; while the sealing layer is not completely cooled, sprinkling a layer of fine sand onto the aggregate surface to obtain modified aggregates; and then mixing the modified aggregates with cement, fine aggregates, water, and admixtures to replace part or all of the coarse aggregates to obtain ready-mixed concrete. Through the synergistic effect of vacuum impregnation and filling combined with the surface sealing of the low-melting-point material, the functional components are effectively locked in and the penetration channels of corrosive media are blocked, significantly improving the concrete's resistance to chloride ion penetration.
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