Modified ultra-fine fly ash, uhcp, and preparation method and application thereof

By growing a calcium carbonate shell on the surface of fly ash and combining it with basalt powder to construct a chemically reinforced interface, the problems of high cost and insufficient activity of UHPC materials are solved, realizing a high-performance, low-cost green UHPC material suitable for super high-rise buildings, long-span bridges and offshore platforms.

CN121717568BActive Publication Date: 2026-06-26UNIV OF JINAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF JINAN
Filing Date
2026-02-25
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, the high cost and high carbon emissions of raw materials such as high-grade quartz sand, cement and silica fume limit the large-scale application of ultra-high performance concrete (UHPC). The activity of fly ash is difficult to meet the interface structure and micro-aggregate functional requirements of UHPC, and some basalt powder is discarded or used at low value.

Method used

By growing a calcium carbonate shell in situ on the surface of fly ash and performing superhydrophobic functionalization, and combining it with basalt powder, a new mechanism of "chemical reaction-enhanced interface" and "physical-chemical dual synergistic enhancement" is constructed. Modified ultrafine fly ash and basalt powder are used together to form UHPC with high solid waste content design.

Benefits of technology

It significantly improves the compressive strength, impermeability and freeze-thaw resistance of UHPC, reduces material costs, achieves green recycling, and meets the stringent requirements of major infrastructure for material performance.

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Abstract

The application relates to modified superfine fly ash, UHPC and a preparation method and application, and belongs to the technical field of building materials. The preparation method of the modified superfine fly ash comprises the following steps: high-frequency plasma treatment of superfine fly ash in an oxidizing atmosphere; reaction by immersion in a calcium source solution; CO2 mineralization reaction of the fly ash loaded with the calcium source; preparation of a fluorosilane modifier solution, addition of fly ash with a porous calcium carbonate shell layer for surface growth, and reflux reaction. The calcium carbonate mineral shell layer is rooted on the surface of the superfine fly ash, ensuring the long-term stability of the micro-nano rough structure, so that the super-hydrophobicity, the anti-wear ability and the durability of the material are significantly improved. Through the high solid waste content design of the modified fly ash + basalt powder, the compressive strength, the impermeability and the freeze-thaw resistance of the UHPC are significantly improved.
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