High-water-resistance magnesium oxychloride-based road base soil curing material and preparation method thereof

Abstract

The invention discloses a high-water-resistance magnesium oxychloride-based road base soil solidification material and a preparation method thereof, and belongs to the technical field of building materials. The curing material is prepared from the following raw materials: light calcined magnesia, magnesium chloride, calcium bicarbonate, polyanionic cellulose, sodium n-butyl oleate sulfate, ferric chloride, aluminum chloride, coal ash, polyacrylamide, monopotassium phosphate and water. According to the present invention, the 28d unconfined compressive strength can achieve more than 6.7 MPa, the water stability coefficient can achieve more than 96.9%, the requirement of road base soil solidification can be met, in addition, the magnesium oxychloride production process has characteristics of low energy consumption and less carbon emission, the achievement of the carbon peak target is easily achieved, and the significant social and economic benefits are provided.

Description

technical field [0001] The invention relates to a highly water-resistant magnesium oxychloride-based road base soil solidification material and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] At this stage, large-scale infrastructure construction and dredging of silt have produced a large amount of waste earth, which can cause a large number of environmental pollution problems due to improper disposal. However, large-scale road network construction is facing a large demand for earth and stone resources. Traditional cement stabilized gravel The method of layering requires a lot of excavation of mountains and rocks, causing serious environmental problems. Therefore, the use of soft soil for solidification and resource utilization not only solves the environmental problems caused by waste earthwork piling, but also solves the demand for earthwork resources faced by large-scale infrastructure design and construct...

AI Technical Summary

Problems solved by technology

In recent years, magnesium oxychloride cement technology has developed rapidly, and the technology of soil solidification using magnesium-based cementitious materials has also made great progress. However, there is still a long way to go to achieve the goal of solidifying soil into road base materials. gap

[0005] Patent CN 109305794 B discloses a magnesium oxysulfide-based raw soil curing agent, its preparation method and application. The method uses light-burned magnesium oxide powder, magnesium sulfate solution, polyvinyl alcohol fiber, phosphoric acid and sodium dihydrogen phosphate as raw materials , but the mass ratio of curing agent to raw soil in this method reaches 2:1, and the amount of curing agent is too high. In addition, after the test block is soaked in water, its compressive strength loss can reach 19%. Obviously, this method cannot Applied to pavement base

[0006] Patent CN 109626946 A discloses a magnesium oxychloride-based soil curing agent, its preparation method and application. The method uses light-burned magnesium oxide powder, magnesium chloride solution, polyvinyl alcohol fiber, phosphoric acid, sodium dihydrogen phosphate, ferrous sulfate As the raw material, the mass ratio of curing agent to raw soil in this method reaches 1.43:1, and its 7d compressive strength is 18.29MPa. Too high curing agent dosage makes the cost of this method too high, which limits the scope of application of this method , the compressive strength of 7d also greatly exceeds the mechanical requirements of the pavement base material. In addition, after soaking in water, the loss of compressive strength of the test block can reach 18%, and the water resistance is insufficient, so this method cannot be applied to the road grassroots

[0007] Patent CN 110117143 B discloses a method for solidifying mud with magnesium-based composite materials. The method uses magnesium oxide, magnesium chloride hexahydrate, slag or slag composition, carbide slag, silicon powder, anhydrous sodium sulfate, and water-absorbing resin as raw materials. But this method does not solve the problem of poor water resistance of magnesium oxychloride cement

[0008] It can be seen from the above that although magnesium oxychloride-based cementitious materials have high strength, they have poor water resistance and cannot be directly used for curing road base materials, which severely limits the application of magnesium oxychloride-based cementitious materials in road engineering.

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