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Cement-stabilized iron tailing pavement semi-rigid base

A semi-rigid base, cement-stabilized technology, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of unutilized iron tailings and waste rock, reduce environmental degradation, and achieve compactness. The effect of raising and lowering costs

Inactive Publication Date: 2022-04-08
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on iron tailings used in road engineering is mainly concentrated on 4.75mm or less, and most iron tailings waste rocks cannot be utilized

Method used

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  • Cement-stabilized iron tailing pavement semi-rigid base
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  • Cement-stabilized iron tailing pavement semi-rigid base

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The cement-stabilized iron tailings pavement semi-rigid base is made of the following components by weight: 4% ordinary Portland cement, 42% coarse-grained iron tailings waste rock, 23% fine-grained iron tailings waste rock , 35% iron tailings.

[0030] The particle size of coarse-grained iron tailing waste rock is mainly concentrated in 4.75-19mm, the particle size of fine-grained iron tailing waste rock is concentrated in 2.36-4.75mm, and the particle size of iron tailing sand is mainly concentrated in 0.075-2.36mm. 1.

[0031] Table 1 Coarse and fine aggregate sieve residue

[0032]

[0033] The indicators of the coarse-grained iron tailings waste rock and the fine-grained iron tailings waste rock are shown in Table 2.

[0034] Table 2 Physical properties of iron tailings waste rock

[0035]

[0036] The indicators of iron tailings are shown in Table 3.

[0037] Table 3 Physical properties of iron tailings sand

[0038]

[0039] Coarse iron tailing wast...

Embodiment 2

[0047] The cement-stabilized iron tailings pavement semi-rigid base is made of the following components by weight: 5% ordinary Portland cement, 42% coarse-grained iron tailings waste rock, 23% fine-grained iron tailings waste rock , 35% iron tailings.

[0048] The particle size of coarse-grained iron tailing waste rock is mainly concentrated in 4.75-19mm, the particle size of fine-grained iron tailing waste rock is concentrated in 2.36-4.75mm, and the particle size of iron tailing sand is mainly concentrated in 0.075-2.36mm. The mass percentages of ore waste rocks passing through 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm and 2.36mm are 94.2%, 68.2%, 41.4%, 11.3%, 0.75% and 0.5%, respectively, and fine-grained iron tailing waste rocks pass through The mass percentages of 4.75mm, 2.36mm, and 1.18mm are 43.6%, 1.1%, and 0.8%, respectively, and the mass percentages of iron tailings passing through 2.36mm, 1.18mm, and 0.075mm are 98.1%, 86.6%, and 13.9%, respectively.

[0049] The apparen...

Embodiment 3

[0057] The cement-stabilized iron tailings pavement semi-rigid base is made of the following components by weight: 6% ordinary Portland cement, 42% coarse-grained iron tailings waste rock, 23% fine-grained iron tailings waste rock , 35% iron tailings.

[0058] The particle size of coarse-grained iron tailing waste rock is mainly concentrated in 4.75-19mm, the particle size of fine-grained iron tailing waste rock is concentrated in 2.36-4.75mm, and the particle size of iron tailing sand is mainly concentrated in 0.075-2.36mm. The mass percentages of ore waste rocks passing through 19mm, 16mm, 13.2mm, 9.5mm, 4.75mm and 2.36mm are 94.2%, 68.2%, 41.4%, 11.3%, 0.75% and 0.5%, respectively, and fine-grained iron tailing waste rocks pass through The mass percentages of 4.75mm, 2.36mm, and 1.18mm are 43.6%, 1.1%, and 0.8%, respectively, and the mass percentages of iron tailings passing through 2.36mm, 1.18mm, and 0.075mm are 98.1%, 86.6%, and 13.9%, respectively.

[0059] The apparen...

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Abstract

The invention discloses a cement-stabilized iron tailing pavement semi-rigid base and relates to a preparation method of a building material. The cement-stabilized iron tailing pavement semi-rigid base comprises 4-6% of ordinary Portland cement, 41-43% of coarse-grained iron tailing waste rock, 22-24% of fine-grained iron tailing waste rock and 34-36% of iron tailing sand, and the iron tailing waste rock and the ore sand are both waste after mineral separation and are main components of industrial solid waste. The cement-stabilized iron tailing pavement base disclosed by the invention has the advantages of small shrinkage, reduced gaps among particles and high compressive strength under grading design, the 7d compressive strength can reach 4-6MPa, and the cement-stabilized iron tailing pavement base meets the heavy traffic requirements of cement-stabilized highways and first-grade highways. And moreover, industrial wastes can be consumed, accumulation of iron tailings is reduced, the environment is protected, and recycling of the industrial wastes is promoted.

Description

technical field [0001] The invention belongs to the field of highway pavement bases, in particular to semi-rigid bases of cement-stabilized iron tailings pavement. Background technique [0002] With the rapid development of the iron and steel industry, the quantity of iron tailings is increasing rapidly, but its utilization rate is very low at present, and the degree of pollution to the environment is also becoming more and more serious. In my country, iron tailings have become a solid waste with the largest amount of accumulation but the lowest utilization rate. According to relevant statistics, as of the end of 2013, the total amount of tailings accumulation in my country has reached 14.6 billion tons, of which the iron tailings accumulation is about 3 billion tons, but its comprehensive utilization rate is less than 10%, which is 60% higher than that of developed countries. % comprehensive utilization compared with the gap is very large. The massive accumulation of iron ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/12C04B20/00
CPCY02W30/91
Inventor 杨道魁张延年
Owner SHENYANG JIANZHU UNIVERSITY
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