Aggregate with irradiation-resistant function and preparation method and application thereof

A radiation-resistant and functional technology, applied in the field of radiation-resistant aggregates and their preparation, can solve the problems of poor concrete homogeneity, weak areas of concrete shielding, and high aggregate density.

Inactive Publication Date: 2020-10-30
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the aggregate density used in the preparation of radiation-resistant concrete is too high, resulting in poor concrete homogeneity and thus the existence of weak shielding areas in the concrete, thereby providing a Aggregate with radiation resistant function

Method used

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  • Aggregate with irradiation-resistant function and preparation method and application thereof
  • Aggregate with irradiation-resistant function and preparation method and application thereof
  • Aggregate with irradiation-resistant function and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Raw materials for preparing boron industrial waste slag regeneration aggregate: boron mud 50kg (B 2 o 3 mass fraction of CaO 5%, water content 3.8%), calcareous shale 27kg (mass fraction of CaO 15%, loss on ignition 10%, particle size ≤ 5mm), metakaolin 22kg (specific surface area 12000m 2 / kg, SiO 2 The mass fraction of 50%, Al 2 o 3 The mass fraction of 50%) and flux lithium metaborate 1kg;

[0037] Raw materials for preparing the cement-based shell: 10.8kg of cement, 2.99kg of fly ash, 0.96kg of silica fume, 7.06kg of water, 0.23kg of polycarboxylate water reducing agent (32% water reducing rate) and 0.89kg of UEA expansion agent .

[0038]Mix and grind the above-mentioned boron mud, shale, metakaolin and flux, and then granulate, with a particle size of 5-7mm and a moisture content of 15%; preheat the spheres obtained by granulation at 600°C for 25min , then calcined at 1150°C for 40min, and finally cooled naturally in the air to room temperature, and the rege...

Embodiment 2

[0040] Raw materials for preparing boron industrial waste slag regeneration aggregate: boron mud 42kg (B 2 o 3 mass fraction of CaO 8%, water content 2.5%), calcareous shale 31kg (mass fraction of CaO 25%, loss on ignition 8%, particle size ≤ 5mm), metakaolin 22kg (specific surface area 14000m 2 / kg, SiO 2 The mass fraction of 60%, Al 2 o 3 The mass fraction of 40%) and flux lithium pyroborate 5kg;

[0041] Raw materials for preparing the cement-based shell: 15.5kg of cement, 3.87kg of fly ash, 1.58kg of silica fume, 7.93kg of water, 0.49kg of polycarboxylate water reducing agent (32% water reducing rate) and 1.61kg of UEA expansion agent .

[0042] Mix and grind the above-mentioned boron mud, shale, metakaolin and flux, and then granulate, with a particle size of 13-15mm and a moisture content of 25%; preheat the granulated spheres at 800°C for 40 minutes , and then calcined at 1050°C for 60 minutes, and finally cooled naturally in the air to room temperature, and the r...

Embodiment 3

[0044] Raw materials for preparing boron industrial waste slag regeneration aggregate: boron mud 42kg (B 2 o 3 mass fraction of CaO 6%, water content 1.5%), calcareous shale 35kg (mass fraction of CaO 20%, loss on ignition 7%, particle size ≤ 5mm), metakaolin 22kg (specific surface area 12000m 2 / kg, SiO 2 The mass fraction of 65%, Al 2 o 3 The mass fraction of 35%) and flux lithium pyroborate 1kg;

[0045] Raw materials for preparing the cement-based shell: 18.86kg of cement, 4.67kg of fly ash, 2.09kg of silica fume, 12.58kg of water, 0.65kg of polycarboxylate water reducing agent (28% water reducing rate) and 2.13kg of UEA expansion agent .

[0046] Mix and grind the above-mentioned boron mud, shale, metakaolin and flux, and then granulate, with a particle size of 10-12mm and a moisture content of 20%; preheat the granulated sphere at 700°C for 35min , then calcined at 1100°C for 50min, and finally cooled naturally in the air to room temperature, and the regenerated ne...

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Abstract

The invention provides an aggregate with an irradiation-resistant function and a preparation method and application thereof. The aggregate comprises boron industrial waste residue recycled aggregate and a cement-based shell coating the surface of the boron industrial waste residue recycled aggregate; the boron industrial waste residue recycled aggregate is prepared from the following raw materialsin percentage by weight: 42 to 50 percent of boron mud, 27 to 35 percent of shale, 22 to 30 percent of metakaolin and 1 to 5 percent of a fluxing agent; the cement-based shell layer is prepared fromthe following raw materials in percentage by weight: 46 to 50 percent of cement, 10 to 13 percent of coal ash, 4.2 to 5.1 percent of silica fume, 25.6 to 30.7 percent of water, 1.0 to 1.6 percent of awater reducing agent and 3.9 to 5.2 percent of an expanding agent. The boron industrial waste residue recycled aggregate is subjected to surface modification by adopting a cement-based material, so that the surface structure and performance of the aggregate can be optimized, the porosity and water absorption rate are reduced, the compactness is improved, and the mechanical property, durability and radiation resistance of the aggregate are further enhanced.

Description

technical field [0001] The invention relates to the field of solid waste utilization and radiation protection materials, in particular to a radiation-resistant aggregate and its preparation method and application. Background technique [0002] At present, when preparing concrete with high neutron radiation resistance, high-density natural ore aggregates (hematite, limonite, barite, etc.) are widely used in my country as coarse and fine aggregates. Turn into slow neutrons; add boron-containing substances (such as borax, boron carbide, etc.) as neutron absorbers. However, since the bulk density of natural high-density aggregate is much higher than that of cement paste, it is easy to settle and segregate during concrete vibrating construction, and the construction operability is poor; and these natural ore reserves with high density and radiation protection characteristics are limited, so it is impossible to To meet the growing engineering needs, it is not suitable for large-sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/02C04B20/10
CPCC04B18/023C04B20/1077
Inventor 曹银王玲王振地王蒙姚燕
Owner CHINA BUILDING MATERIALS ACAD
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