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Semi-rigid base material for high grade pavement and preparation method thereof

A semi-rigid base, high-grade technology, applied in the field of pavement base materials, can solve problems such as reducing road construction costs, excessive mining of sand and gravel materials, etc., to reduce road construction costs, solve serious environmental problems, and promote sustainable development.

Inactive Publication Date: 2017-10-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So as to solve the serious environmental problems caused by the accumulation of iron tailings and the excessive mining of sand and gravel materials, and greatly reduce the cost of road construction

Method used

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  • Semi-rigid base material for high grade pavement and preparation method thereof
  • Semi-rigid base material for high grade pavement and preparation method thereof
  • Semi-rigid base material for high grade pavement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032]A method for preparing a high-grade pavement semi-rigid base material, the steps of which are as follows:

[0033] (1) Quicklime and phosphogypsum are mixed and ground; during the mixing and grinding process of phosphogypsum and quicklime, quicklime can absorb part of the water in phosphogypsum, which can greatly increase the fineness of phosphogypsum and make their activity fully exerted;

[0034] (2) The mixed ground material obtained after quicklime and phosphogypsum powder and fly ash, biological coagulation enzyme, iron tailings waste rock and crushed iron tailings waste rock, iron tailings sand are mixed evenly by mass ratio;

[0035] (3) Finally, add cement and polypropylene fiber and mix well.

Embodiment 1

[0037] In a method for comprehensively utilizing Anshan-type iron tailings waste rock and iron tailings sand to prepare high-grade pavement semi-rigid bases, the cement uses 32.5-grade ordinary Portland cement, high-quality quicklime, and the active ingredient of fly ash is greater than 70%, and bio-agglomeration The enzyme product is a dark brown transparent liquid, easily soluble in water, with a density of about 1g / cm 3 Left and right, it is weakly acidic.

[0038] Table 4 shows the chemical composition of Anshan-style iron tailings.

[0039] Table 4 Chemical composition of Anshan-style iron tailings

[0040]

[0041] The method for preparing a semi-rigid base course for high-grade pavement using iron tailings comprises the following steps: mixing quicklime and phosphogypsum for 16 hours and then pulverizing them, adding fly ash, waste iron tailings and crushed iron tailings in proportion Stone, iron tailings sand, biological coagulation enzyme, and then add cement and...

Embodiment 2

[0043] Example 2: Comprehensive stabilization of magmatic iron tailings by using industrial waste phosphogypsum, other inorganic binders and admixtures. Table 5 shows the chemical composition of magmatic iron tailings.

[0044] Table 5 Chemical composition of magmatic iron tailings

[0045]

[0046] Steps: Mix quicklime and phosphogypsum for 16 hours and grind them finely for later use, add fly ash, waste iron tailings and crushed iron tailings waste, iron tailings, biocoagulation enzyme and mix well, then add cement and Polypropylene fibers make the compound. Among them, 7% of fly ash, 9% of quicklime, 8.8% of phosphogypsum, 68% of waste iron tailings and crushed iron tailings, 3% of iron tailings and 4.2% of cement, biocoagulation enzyme accounted for the total amount of the mixture 2%, polypropylene fiber 1.5kg / m 3 .

[0047] At this mix ratio, the strength of iron tailings used as pavement base material can meet the specified road use standards for expressways and fi...

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Abstract

The invention provides a semi-rigid base material for a high grade pavement and a preparation method thereof. According to the invention, iron tailing waste rock, broken iron tailing waste rock and iron tailing sand are fully utilized and ardealite, quick lime, cement, coal ash, biological agglomeration enzyme and polypropylene fiber are added, so that the optimal mixing proportion scope of the materials is given. The quick lime and the ardealite are stirred and covered for 16 hours and then are milled, so that the activity thereof can be greatly promoted, the active ingredients in iron tailings and coal ash can be stimulated and the pozzolanic reaction can be quickened. The four typical iron tailings, including Anshan, magma, volcano and skarn iron tailings are stabilized and all can meet the requirements of the semi-rigid bases of the high grade pavements. The invention aims to solve the problem of bulk deposition of the iron tailings, reduce the development of gravel building materials, reduce the bulk deposition of the industrial residue ardealite, fully utilize the industrial residue coal ash and greatly reduce the cost of road construction. The material has significance in realizing circular economy and sustainable development.

Description

technical field [0001] The invention relates to the field of pavement base materials, in particular to a high-grade pavement semi-rigid base material and a preparation method thereof. Background technique [0002] Iron tailings refer to the solid composites of metal oxides and various mineral components remaining after the ore is crushed, screened, ground, and classified by a special production process in a concentrator to select useful metals. my country mainly adopts the method of stockpiling. Tailings have led to a rapid increase in the stockpiling of iron ore tailings. Now the stockpiling of tailings has exceeded 10 billion tons. The large stockpiling of iron tailings has brought about the following problems: such as occupying a large amount of land and the loss of harmful elements , causing serious environmental pollution, high cost of construction and maintenance of tailings ponds, landslides and debris flows and other safety issues. The environment deteriorated rapidly....

Claims

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Application Information

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IPC IPC(8): C04B28/02
CPCC04B28/021C04B2111/0075C04B18/08C04B22/064C04B22/144C04B18/12C04B16/0633C04B24/14C04B7/02C04B7/00
Inventor 董泽蛟田知文杨晨李新凯郗凤明
Owner HARBIN INST OF TECH
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