Solid waste grouting material for bridge tunnel empty area and preparation method thereof

By mixing steel slag, fly ash, blast furnace slag, desulfurized gypsum and sodium metasilicate in a specific ratio, a low-cost, high-performance grouting material for bridge and tunnel goaf areas was prepared, solving the problems of high energy consumption and complex construction in existing technologies, and realizing the efficient utilization of solid waste and environmentally friendly construction.

CN116969732BActive Publication Date: 2026-07-10CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Filing Date
2023-04-23
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing grouting materials for bridge and tunnel goaf areas suffer from high energy consumption, heavy pollution, high cost, and complex construction processes. They are difficult to effectively utilize solid waste materials, and the existing formulas contain high-energy-consuming materials such as cement, which limits their application in bridge and tunnel goaf areas.

Method used

Using steel slag, fly ash, blast furnace slag, desulfurized gypsum and sodium metasilicate as the main raw materials, and mixing them in a specific ratio with the addition of sodium metasilicate as an additive, a grouting material with a fluidity of less than 35S and a uniaxial compressive strength of more than 2MPa is prepared, and the solid waste utilization rate is as high as 90% or more.

Benefits of technology

It has achieved low-cost, high-performance grouting materials that can effectively consume a large amount of solid waste, meet green and environmental protection requirements, simplify construction processes, shorten construction time, and meet the construction needs of bridge and tunnel mining subsidence areas.

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Abstract

The application relates to the technical field of grouting materials, and discloses a solid waste grouting material for bridge and tunnel mined-out areas and a preparation method thereof. The solid waste grouting material is prepared by fully mixing steel slag, fly ash, slag, desulfurization gypsum, sodium metasilicate and water at normal temperature, the fluidity of the obtained grouting material is kept below 35S during the grouting process, the 28d uniaxial compressive strength is greater than or equal to 2MPa, and the total production cost of the grouting material is less than or equal to 200 yuan / ton. Only by strictly limiting the mixing ratio of raw materials and the solid water ratio, and by making the proportion of low-price solid waste large enough, can the cost be effectively suppressed to less than or equal to 200 yuan / ton, the fluidity be less than or equal to 35S, the mechanical strength be greater than or equal to 2MPa, and the grouting material have wide use value in bridge mined-out areas.
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