Phosphogypsum water hard road base, road base material and preparation method thereof

Abstract

The invention discloses a phosphogypsum water hard road base, a road base material and a preparation method thereof, relating to the field of road engineering construction. The preparation method of the road base material comprises the following steps: weighing 85-92 percent of phosphogypsum and 15-8 percent of ordinary portland cement, uniformly mixing and stirring, thereby obtaining a preliminary mixture; weighing 99.7-99.95 percent of preliminary mixture and 0.3-0.05 percent of a phosphogypsum water hard curing agent, uniformly mixing and stirring, thereby obtaining a premix; controlling the moisture content of the premix to be 14-18 percent, thereby obtaining a base material, wherein the phosphogypsum water hard curing agent is prepared by mixing the following components in percentage by mass: 40-60 percent of elastic styrene-acrylic emulsion, 30-20 percent of nanometer alumina sol and 30-20 percent of nanometer silica sol. The road base is prepared from the road base material according to a standard road base construction method. The road base material is produced by utilizing phosphogypsum, the environmental pollution is reduced, and wastes are changed into valuable materials; and moreover, the formed road base is high in crack resistance, difficult to corrode and long in service life.

Description

technical field [0001] The invention relates to the field of road engineering construction, in particular to a phosphogypsum hydraulic road base, a road base material and a preparation method thereof. Background technique [0002] Phosphogypsum is a solid waste discharged during the production of phosphate fertilizer and phosphoric acid. About 4.5-5t of phosphogypsum is produced for every ton of phosphoric acid produced. There is a large amount of phosphogypsum produced in my country every year. Phosphogypsum has the following characteristics: Phosphogypsum is a powdery material with almost no plasticity; phosphoric acid, sulfuric acid and hydrofluoric acid remain in phosphogypsum, which is an acidic by-product (pH<3); phosphogypsum contains 25% ~30% free water, the vertical permeability coefficient of phosphogypsum is 2×10 -5 ~1×10 -3 . At present, the effective utilization rate of phosphogypsum in China is less than 10%. Only a very small amount of phosphogypsum is u...

AI Technical Summary

Problems solved by technology

At present, the effective utilization rate of phosphogypsum in China is less than 10%. Only a very small amount of phosphogypsum is used to produce building materials, and the remaining huge amount of phosphogypsum is piled up as solid waste. Harmful heavy metal chemicals such as arsenic, cadmium, and mercury pollute the environment

The road base formed by fly ash gravel is a semi-rigid base, which has obvious hydraulic and retarding properties. However, once the aggregates, lime and fly ash are combined, the chemical reaction inside stops, and the road matrix formed is too rigid and easy to build. Cracked by temperature and humidity, poor crack resistance