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High-silicon iron tailing multi-element solid waste activated concrete and preparation method thereof

A technology for iron tailings and concrete, which is applied in the field of solid waste recycling, can solve problems such as ecological damage and environmental pollution, and achieve the effect of saving costs and reducing cement consumption.

Active Publication Date: 2021-03-09
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The massive stockpiling of tailings and waste rocks and the violent exploitation of high-quality natural resources (sand and gravel) have caused serious ecological damage and environmental pollution risks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] High-silicon type iron tailings multi-component solid waste activated concrete, its raw materials include P·O42.5 ordinary portland cement 380 kg / m 3 , F class I class fly ash 40 kg / m 3 , Modified high-silicon type ultra-fine iron tailings 30 kg / m 3 , 5 ~ 20mm continuously graded tailings waste rock 945kg / m 3 , tailings fine sand 875 kg / m 3 , water 165 kg / m 3 , Admixtures (including polycarboxylate high-performance water reducer, cellulose ether and dextrin; of which: polycarboxylate high-performance water reducer 5 kg / m 3 , cellulose ether accounts for 1.5‰ of the mass of the superplasticizer, and dextrin accounts for 1.5% of the mass of the superplasticizer). The 7-day compressive strength of the target product high-silicon type iron tailings multi-component solid waste activated concrete is 36.1MPa, and the 28-day compressive strength is 41.7MPa. The 56-day chloride ion diffusion coefficient is 2.3×10 -12 m 2 / s, 56-day chloride ion flux 1840C, cylindrical spl...

Embodiment 2

[0064] Mixing ratio: cement 360 kg / m 3 ; fly ash 30 kg / m 3 ;Modified high-silicon type ultra-fine iron tailings 30 kg / m 3 ;5-20mm continuously graded tailings waste rock 930 kg / m 3 ; tailings fine sand 930 kg / m 3 ;Water 160kg / m 3 ;Admixture (of which polycarboxylate superplasticizer 7.5 kg / m 3 ). The 7-day compressive strength is 35.4MPa, and the 28-day compressive strength is 38.6MPa. The 56-day chloride ion diffusion coefficient is 2.7×10 -12 m 2 / s, 56-day chloride ion flux of 1890C, cylindrical splitting tensile strength of 2.9 MPa, porosity of 21%, elastic modulus of 24, water absorption of 6%, freeze-thaw resistance of 19%, and air content of 5%.

[0065] The preparation method is the same as in Example 1.

Embodiment 3

[0067] Mixing ratio: cement 380 kg / m 3 ; Fly ash 40 kg / m 3 ;Modified high-silicon type ultra-fine iron tailings 30 kg / m 3;5-20mm continuously graded tailings waste rock 930 kg / m 3 ; tailings fine sand 890 kg / m 3 ; Water 165kg / m 3 ;Admixture (including polycarboxylate high-performance water reducer 4.6 kg / m 3 ; Cellulose ether accounts for 1.5‰ of the water reducing agent; dextrin accounts for 1.5% of the water reducing agent). The 7-day compressive strength is 34.2MPa, and the 28-day compressive strength is 37.9MPa. The 56-day chloride ion diffusion coefficient is 2.9×10 -12 m 2 / s, 56-day chloride ion flux of 1930C, cylindrical splitting tensile strength of 2.8 MPa, porosity of 22%, elastic modulus of 23, water absorption of 7%, freeze-thaw resistance of 18%, and air content of 6%.

[0068] The preparation method is the same as in Example 1.

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Abstract

The invention belongs to the field of solid waste recycling, and particularly relates to high-silicon iron tailing multi-element solid waste activated concrete and a preparation method thereof, and the concrete comprises the following raw materials: 360-380kg / m<3> of cement, 30-40kg / m<3>of fly ash, 30-40kg / m<3> of modified high-silicon ultrafine iron tailings, 930-950kg / m<3> of tailing waste stone, 870-930kg / m<3> of tailing fine sand, 160-170kg / m<3> of water, and 4-8kg / m<3> of an additive. The preparation method of the modified high-silicon ultrafine iron tailings comprises the following steps: screening high-silicon ultrafine iron tailings by a 200-mesh screen, mechanically activating by using an XQM-8 vertical planetary ball mill at the interval of forward and reverse rotation of 10-15 minutes and the rotating speed of 380-395r / min, operating for two hours, opening a tank, and cooling to room temperature. The concrete has the advantages of high total solid waste mixing amount, low cement consumption, ideal concrete impermeability and high later compressive strength.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a high-silicon type iron tailing multi-component solid waste activated concrete and a preparation method thereof. Background technique [0002] There is a certain gap between my country's large volume of industrial solid waste used in concrete and the existing research level abroad. In the 1990s, fly ash was gradually used as an admixture in concrete, and the large-scale application of bulk industrial solid waste in ready-mixed concrete began. At the beginning of this century, granulated blast furnace slag and steel slag were gradually applied in batches as admixtures in ready-mixed concrete. In 2014, the "Technical Regulations for the Application of Iron Tailings Aggregate Concrete" was officially implemented, which promoted the batch application of iron tailings in concrete. [0003] At present, the annual production of industrial solid waste in my country is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/20C04B111/94
CPCC04B28/04C04B2111/20C04B2111/94C04B2201/50C04B18/08C04B18/12C04B24/383C04B24/38C04B2103/302
Inventor 顾晓薇张伟峰李晓慧
Owner NORTHEASTERN UNIV