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

A technology of road base and gypsum water, applied in the field of phosphogypsum hydraulic road base, road base material and its preparation, can solve the problems of poor crack resistance, high rigidity of road base, occupying large land, etc., to improve mechanical strength, use Long life and anti-corrosion effect

Active Publication Date: 2015-09-16
黄菁华 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

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preparation example Construction

[0022] The invention provides a method for preparing a phosphogypsum hydraulic road base material, comprising the following steps:

[0023] A: Harmless treatment of phosphogypsum: In terms of mass percentage, weigh 85% to 92% of phosphogypsum and 15% to 8% of ordinary silicon cement, mix and stir evenly to obtain the primary mixture.

[0024] Preferably, 87% to 90% of phosphogypsum and 13% to 10% of ordinary silicon cement are weighed;

[0025] Further preferably, 88% of phosphogypsum and 12% of ordinary Portland cement are weighed, and ordinary Portland cement is ordinary Portland cement.

[0026] The specific production process is as follows: Weigh phosphogypsum, add it to a silo of the cement-stabilized soil mixing station, weigh ordinary silicon cement, and add it to another silo of the cement-stabilized soil mixing station; The material in the bin is added to the forced mixer, mixed and stirred evenly to obtain the primary mixture. Because phosphogypsum is acidic, cemen...

Embodiment 1

[0035] Embodiment 1 provides a kind of preparation method of phosphogypsum hydraulic road base material, comprises the following steps:

[0036] Take by weighing phosphogypsum 85kg, ordinary silicon cement 15kg, mix and stir evenly, obtain primary mix; Take by weighing primary mix 49.85kg, phosphogypsum hydraulic curing agent 0.15kg (the component of phosphogypsum hydraulic curing agent comprises: elastic benzene Acrylic emulsion 2kg, nano aluminum sol 1.5kg, nano silica sol 1.5kg, the solid content of described elastic styrene-acrylic emulsion > 55%), mix and stir evenly, obtain premix, and control the moisture content of premix to 14% , to obtain the phosphogypsum hydraulic road base material.

[0037] The physical properties of the phosphogypsum hydraulic road base material were tested: the 7-day unconfined compressive strength was 2.68 MPa; the 28-day unconfined compressive strength was 7.8 MPa.

Embodiment 2

[0039] Embodiment 2 provides a kind of preparation method of phosphogypsum hydraulic road base material, comprises the following steps:

[0040] Take by weighing phosphogypsum 92kg, ordinary silicon cement 8kg, mix and stir evenly, obtain primary mix; Take by weighing primary mix 49.975kg, phosphogypsum hydraulic curing agent 0.025kg (the component of phosphogypsum hydraulic curing agent comprises: elastic benzene Acrylic emulsion 3kg, nano-aluminum sol 1kg, nano-silica sol 1kg, the solid content of described elastic styrene-acrylic emulsion>55%), mix and stir evenly, obtain premix, and control the moisture content of premix to 18%, obtain The phosphogypsum hydraulic road base material.

[0041] The physical properties of the phosphogypsum hydraulic road base material were tested: the 7-day unconfined compressive strength was 3.5 MPa; the 28-day unconfined compressive strength was 8 MPa.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B24/26
Inventor 黄菁华陈江胡海森赵挺松谢思敏辜发建
Owner 黄菁华
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