Roadbed filler for road and preparation method of roadbed filler

Abstract

The invention relates to a roadbed filler for a road and a preparation method of the roadbed filler. The roadbed filler for the road is characterized by being prepared from lime, pulverized fuel ash, phosphogypsum and stabilizer. The weight percentage of each material in the lime, the pulverized fuel ash and the phosphogypsum is 15% of lime, 30-50% of pulverized fuel ash and 35-60% of phosphogypsum; the sum of the weight percentages of the materials is 100%; the stabilizer is water glass or NaAlO2 (sodium metaaluminate); the adding amount of the water glass is 2-6% of total mass of the lime, the pulverized fuel ash and the phosphogypsum, and the adding amount of the NaAlO2 is 0.5-2% of total mass of the lime, the pulverized fuel ash and the phosphogypsum. Due to the roadbed filler for the road prepared by the method, not only can the early strength be improved, but also the problem of water stability can be solved.

Description

technical field [0001] The invention relates to a road subgrade filler and a preparation method thereof. Background technique [0002] Phosphogypsum is an industrial by-product produced in the process of wet production of phosphoric acid. According to reports, 4 to 5 tons of phosphogypsum will be discharged for every ton of phosphoric acid produced. At present, the annual discharge of phosphogypsum in the world is about 110 million to 130 million tons, of which only a small amount has been utilized. Due to the shortage of land resources and lack of natural gypsum in some countries such as Japan and Australia, many phosphogypsum recycling technologies have been developed, and the utilization rate of phosphogypsum is very high. In my country, with the development of the chemical industry, the discharge of phosphogypsum is constantly increasing, but the recycling rate is low, less than 20%, which leads to the accumulation of phosphogypsum around the phosphating plant, which not...

AI Technical Summary

Problems solved by technology

In my country, with the development of the chemical industry, the discharge of phosphogypsum is constantly increasing, but the recycling rate is low, less than 20%, which leads to the accumulation of phosphogypsum around the phosphating plant, which not only takes up a lot of land resources, And it also has a serious impact on the ecological environment

In China, Tang Qingqian et al. conducted research on the feasibility and mechanical properties of phosphogypsum applied to roadbed and pavement engineering. During the construction of experimental embankments, it was found that phosphogypsum is sensitive to water, and unrolled phosphogypsum is similar to spring soil after being saturated with rainwater. Therefore, the water content must be strictly controlled during construction; Shen Weiguo and others have developed a fly ash phosphogypsum pavement base material, which has a greatly improved early strength compared with ordinary fly ash (lime-fly ash) materials. However, the water stability performance does not meet the required requirements, so it cannot be popularized and applied.

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