CN111847939A - Aggregate with irradiation resistance function and preparation method and application thereof - Google Patents

Aggregate with irradiation resistance function and preparation method and application thereof Download PDF

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CN111847939A
CN111847939A CN202010778095.5A CN202010778095A CN111847939A CN 111847939 A CN111847939 A CN 111847939A CN 202010778095 A CN202010778095 A CN 202010778095A CN 111847939 A CN111847939 A CN 111847939A
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aggregate
cement
boron
resistance function
industrial waste
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曹银
王玲
王振地
王蒙
姚燕
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China Building Materials Academy CBMA
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/023—Fired or melted materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1055—Coating or impregnating with inorganic materials
    • C04B20/1077—Cements, e.g. waterglass

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Processing Of Solid Wastes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention provides an aggregate with an irradiation resistance function, and a preparation method and application thereof. The aggregate comprises boron industrial waste residue regenerated aggregate and a cement-based shell layer coated on the surface of the boron industrial waste residue regenerated aggregate; the boron industrial waste residue regenerated aggregate comprises the following raw materials in percentage by weight: 42-50% of boric sludge, 27-35% of shale, 22-30% of metakaolin and 1-5% of fluxing agent; the cement-based shell layer comprises the following raw materials in percentage by weight: 46-50% of cement, 10-13% of fly ash, 4.2-5.1% of silica fume, 25.6-30.7% of water, 1.0-1.6% of water reducing agent and 3.9-5.2% of expanding agent. The cement-based material is adopted to carry out surface modification on the boron industrial waste residue regenerated aggregate, so that the surface structure and the performance of the aggregate can be optimized, the porosity and the water absorption are reduced, the compactness is improved, and the mechanical property, the durability and the irradiation resistance of the aggregate are further enhanced.

Description

Aggregate with irradiation resistance function and preparation method and application thereof
Technical Field
The invention relates to the field of solid waste utilization and radiation-proof materials, in particular to an aggregate with an irradiation-resistant function, and a preparation method and application thereof.
Background
At present, when preparing high-neutron irradiation resistant concrete, high-density natural ore aggregates (hematite, limonite, barite and the like) are widely adopted in China as coarse and fine aggregates, and fast neutrons are moderated into slow neutrons through inelastic scattering; adding boron-containing substance (such as borax, boron carbide, etc.) as neutron absorber. However, since the bulk density of the natural high-density aggregate is much greater than that of the cement paste, the natural high-density aggregate is easy to settle and separate in concrete vibration construction, and the construction operability is poor; and the natural ores with high density and radiation-proof property have limited reserves, cannot meet the increasing engineering requirements and are not suitable for being used in large quantities. On one hand, the boron-containing substance used as the neutron absorber is expensive, and on the other hand, the boron-containing substance can delay the hydration of cement after being added, so that the phenomenon of delayed coagulation or even no coagulation is caused.
The boron industrial waste residue is also called boron mud, is waste residue produced in the borax production process of boron-magnesium ore, is alkaline, and mainly comprises MgO and SiO2And a certain amount of B2O3(2-8%); china's boron mineral data are mainly distributed in Liaoning area, and 5t of boron mud is produced when 1t of borax is produced; currently boron sludge to be treated reaches 1000 million t, and is increased by 100 million t every year. The accumulation of a large amount of boric sludge can cause serious water and soil pollution and seriously affect the health and safety of surrounding life.
Therefore, how to effectively utilize boric sludge in the preparation of high-neutron irradiation resistant concrete with excellent performance is a topic worthy of study.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem of overcoming the defect that the concrete has poor homogeneity and a weak shielding area due to the fact that the density of the aggregate used for preparing the radiation-resistant concrete is too high in the prior art, and thus provides the aggregate with the radiation-resistant function.
The invention also provides a preparation method of the aggregate with the irradiation resistance function.
Therefore, the invention provides an aggregate with an irradiation resistance function, which comprises a boron industrial waste residue regenerated aggregate and a cement-based shell layer coated on the surface of the boron industrial waste residue regenerated aggregate;
the boron industrial waste residue regenerated aggregate comprises the following raw materials in percentage by weight: 42-50% of boric sludge, 27-35% of shale, 22-30% of metakaolin and 1-5% of fluxing agent;
the cement-based shell layer comprises the following raw materials in percentage by weight: 46-50% of cement, 10-13% of fly ash, 4.2-5.1% of silica fume, 25.6-30.7% of water, 1.0-1.6% of water reducing agent and 3.9-5.2% of expanding agent.
Further, the thickness of the cement-based shell layer is 0.5-1.2 mm.
Further, B in the boron mud2O3The mass fraction of the boron-magnesium alloy is more than or equal to 5 percent, the water content is less than or equal to 4 percent, and the boron-magnesium alloy is prepared by air-drying waste residues generated in the borax production process from the boron-magnesium ore.
Furthermore, the shale is calcareous shale and is obtained by mining and crushing shale, the mass fraction of CaO in the shale is more than or equal to 15%, the loss on ignition is less than or equal to 12%, and the particle size is less than or equal to 5 mm; the specific surface area of the metakaolin is more than or equal to 10000m2/kg，SiO2Mass fraction of Al is more than or equal to 50 percent2O3The mass fraction of the active carbon is more than or equal to 35 percent; the water reducing agent is a polycarboxylic acid type water reducing agent; the expanding agent is one or more of calcium sulphoaluminate expanding agents, calcium oxide expanding agents and calcium sulphoaluminate and calcium oxide compound expanding agents.
Further, the flux is a boron-based flux.
The invention also provides a preparation method of the aggregate with the irradiation resistance function, which comprises the following steps:
1) mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent, and then granulating;
2) carrying out heat treatment on the ball obtained by granulation, and then naturally cooling to room temperature to obtain boron industrial waste residue regenerated aggregate;
3) mixing the boron industrial waste residue regenerated aggregate with cement, fly ash, silica fume and an expanding agent, adding water and a water reducing agent, continuously stirring, and then spreading and maintaining the obtained product;
4) and (5) steaming the cured product, and then cooling.
Further, the particle diameter of the spherical body obtained by granulation is 5-15mm, and the water content is 15-25%.
Further, the heat treatment conditions in the step 2) are preheating at 600-.
Further, the concrete preparation process of the step 3) comprises the steps of dry-mixing the boron industrial waste residue regenerated aggregate, cement, fly ash, silica fume and an expanding agent for 1-3min in a vacuum environment of 2-5kPa, adding water and a water reducing agent, continuously stirring for 3-8min, spreading the obtained product, and naturally curing for 18-24 h.
Further, the steam-curing conditions in the step 4) are as follows: the temperature is 60-80 ℃, the pressure is 1-2MPa, and the curing time is 4-12 h.
Further, the mass ratio of the total mass of the cement, the fly ash, the silica fume, the expanding agent, the water and the water reducing agent to the mass of the boron industrial waste residue regenerated aggregate is 0.22-0.45: 1.
The invention also provides application of the aggregate with the irradiation resistance function in concrete.
The technical scheme of the invention has the following advantages:
1. the aggregate with the irradiation resistance function provided by the invention comprises boron industrial waste residue regenerated aggregate and a cement-based shell layer coated on the surface of the boron industrial waste residue regenerated aggregate, the surface of the boron industrial waste residue regenerated aggregate is modified by adopting a cement-based material, the surface structure and the performance of the aggregate can be optimized, the porosity and the water absorption are reduced, the compactness is improved, the mechanical property, the durability and the irradiation resistance of the aggregate are further enhanced, meanwhile, the coated aggregate has good adhesion with cement slurry in the using process, an interface transition region between the aggregate and the slurry can be optimized in the preparation of concrete, and the compactness and the integral strength of the irradiation-resistant concrete are ensured; the aggregate has low density, can replace the traditional natural high-density ore aggregate, and solves the problems of poor homogeneity and the like of the traditional irradiation-resistant concrete caused by the high-density aggregate. Boron mud containing B element is selected as a main raw material of the aggregate, the B element has a large neutron absorption cross section and can play a role of a neutron absorber, the B element serves as a neutron absorber in the aggregate, the neutron irradiation resistance of the aggregate is improved, meanwhile, the influence on cement hydration when the B element is directly used is avoided, the problem of disposal of the boron mud is solved, and ecological environment protection is facilitated; the boron fluxing agent is added, so that the aggregate firing temperature can be reduced, and the energy consumption is saved; the boric sludge mainly contains SiO2, MgO and B2O3, the Si phase and Al phase minerals are adjusted by adding shale and metakaolin, refractory components such as SiO2, Al2O3 phase and MgO provide strength for the aggregate in the sintering process, a compact core structure is formed, and the B element is coated in the compact aggregate.
2. According to the aggregate with the irradiation resistance function, the boron content of the aggregate is improved to a certain extent by adding the boron fluxing agent, and the neutron irradiation resistance of the aggregate is improved; its own B-O and SiO2The S-O tetrahedron is directly connected, and the original regular tetrahedron configuration is changed in the connection process, so that SiO is generated2The stability itself is lowered, thereby lowering the melting temperature thereof.
3. The aggregate with the irradiation resistance function provided by the invention can produce irradiation resistance function aggregates with different irradiation shielding levels by adjusting the boron mud doping amount, and the aggregate with the irradiation resistance function has the advantages of large boron mud doping amount, strong treatment capability on boron mud, low treatment cost and is superior to the existing boron mud solid waste utilization method on the market at present.
4. According to the preparation method of the aggregate with the irradiation resistance function, provided by the invention, when the cement-based shell is prepared, all raw materials are stirred under vacuum, so that bubbles can be prevented from being introduced in the stirring process, the cement paste and the boron industrial waste residue regenerated aggregate are ensured to be fully infiltrated and surface pores are filled, and the compactness of a shell layer and the overall strength of the aggregate can be improved. And a certain amount of expanding agent is added, so that the shrinkage in the slurry hydration process is compensated, the slurry and the interface microstructure of the slurry and the sintered aggregate are improved, and the overall compactness and strength are improved.
5. According to the preparation method of the aggregate with the irradiation resistance function, provided by the invention, the hydration degree of cement and mineral admixture can be improved through high-temperature autoclaved curing, the activity of the expanding agent is fully excited, and the microstructure and compactness of slurry are improved. In addition, the interface bonding property of the sintered aggregate and the surface shell can be greatly improved, and the overall performance of the prepared aggregate is improved.
6. According to the preparation method of the aggregate with the irradiation resistance function, the method of heat treatment after granulation adopts a mode of preheating firstly and then calcining, so that the heat treatment can be ensured to be sufficient, and the thermal stress cracking caused by over-quick temperature rise can be avoided.
7. The radiation-resistant functional aggregate provided by the invention has excellent performance indexes, the apparent density of 2500-.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
Preparing raw materials of boron industrial waste residue regenerated aggregates: boron mud 50kg (B)2O35 percent of calcium shale (15 percent of CaO, 10 percent of loss on ignition, and the grain diameter is less than or equal to 5mm), 27kg of calcium shale (22 kg of metakaolin (the specific surface area is 12000 m)2/kg、SiO250% by mass of (A), Al2O350 percent by mass) and 1kg of fluxing agent lithium metaborate;
preparing raw materials of a cement-based shell layer: 10.8kg of cement, 2.99kg of fly ash, 0.96kg of silica fume, 7.06kg of water, 0.23kg of polycarboxylic acid type water reducing agent (water reducing rate is 32 percent) and 0.89kg of UEA type expanding agent.
Mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent according to the mass, and then granulating, wherein the particle size is 5-7mm, and the water content is 15%; preheating the spheres obtained by granulation at 600 ℃ for 25min, calcining at 1150 ℃ for 40min, and finally naturally cooling in air to room temperature to preliminarily obtain regenerated neutron irradiation resistant functional aggregates; and (2) dry-mixing the sintered aggregate, the cement, the fly ash, the silica fume and the expanding agent with the mass for 2min under a vacuum environment of 2kPa, adding water and a water reducing agent, continuously stirring for 8min, spreading the obtained regenerated lead material coating the cement-based material shell to avoid mutual cementation, naturally curing for 24h, then performing high-temperature high-pressure steam curing for 4h under the conditions of the temperature of 80 ℃ and the pressure of 2MPa, and cooling to room temperature to obtain the high-neutron irradiation resistance functional aggregate prepared by using the boron industrial waste residue, wherein the thickness of the shell of the obtained aggregate cement-based material is 0.53 mm.
Example 2
Preparing raw materials of boron industrial waste residue regenerated aggregates: 42kg of boron mud (B)2O38 percent of calcium shale (25 percent of CaO, 8 percent of loss on ignition, and the grain diameter is less than or equal to 5mm), 31kg of calcium shale (22 kg of metakaolin (the specific surface area is 14000 m)2/kg、SiO260% by mass of Al2O340%) and 5kg of a flux lithium pyroborate;
preparing raw materials of a cement-based shell layer: 15.5kg of cement, 3.87kg of fly ash, 1.58kg of silica fume, 7.93kg of water, 0.49kg of polycarboxylic acid type water reducing agent (water reducing rate is 32 percent) and 1.61kg of UEA type expanding agent.
Mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent according to the mass, and then granulating, wherein the particle size is 13-15mm, and the water content is 25%; preheating the spheres obtained by granulation at 800 ℃ for 40min, calcining at 1050 ℃ for 60min, and finally naturally cooling in air to room temperature to preliminarily obtain regenerated neutron irradiation resistant functional aggregates; and (2) dry-mixing the sintered aggregate, the cement, the fly ash, the silica fume and the expanding agent with the mass for 1min under a vacuum environment of 5kPa, adding water and a water reducing agent, continuously stirring for 3min, spreading the obtained regenerated lead material coating the cement-based material shell to avoid mutual cementation, naturally curing for 18h, then performing high-temperature high-pressure steam curing at the temperature of 60 ℃ and the pressure of 1MPa for 12h, and cooling to room temperature to obtain the high-neutron irradiation resistance functional aggregate prepared by using the boron industrial waste residues, wherein the thickness of the shell of the obtained aggregate cement-based material is 0.85 mm.
Example 3
Preparing raw materials of boron industrial waste residue regenerated aggregates: 42kg of boron mud (B)2O36% by mass, 1.5% by mass of water content), calcium35kg of shale (CaO with the mass fraction of 20%, loss on ignition of 7% and particle size of less than or equal to 5mm) and 22kg of metakaolin (the specific surface area of 12000 m)2/kg、SiO265% by mass of Al2O335%) and 1kg of a flux lithium pyroborate;
preparing raw materials of a cement-based shell layer: 18.86kg of cement, 4.67kg of fly ash, 2.09kg of silica fume, 12.58kg of water, 0.65kg of polycarboxylic acid type water reducing agent (water reducing rate is 28 percent) and 2.13kg of UEA type expanding agent.
Mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent according to the mass, and then granulating, wherein the particle size is 10-12mm, and the water content is 20%; preheating the spheres obtained by granulation at 700 ℃ for 35min, calcining at 1100 ℃ for 50min, and finally naturally cooling in air to room temperature to preliminarily obtain regenerated neutron irradiation resistant functional aggregates; and (2) dry-mixing the sintered aggregate, the cement, the fly ash, the silica fume and the expanding agent with the mass for 3min under a vacuum environment of 4kPa, adding water and a water reducing agent, continuously stirring for 5min, spreading the obtained regenerated lead material coating the cement-based material shell to avoid mutual cementation, naturally curing for 20h, then performing high-temperature high-pressure steam curing at the temperature of 70 ℃ and the pressure of 1.5MPa for 8h, and cooling to room temperature to obtain the high-neutron irradiation resistance aggregate prepared by using the boron industrial waste residues, wherein the thickness of the cement-based material shell of the obtained aggregate is 1.16 mm.
Example 4
Preparing raw materials of boron industrial waste residue regenerated aggregates: 42kg of boron mud (B)2O35 percent of calcium shale (15 percent of CaO, 10 percent of loss on ignition, and the grain diameter is less than or equal to 5mm), 27kg of calcium shale (30 kg of metakaolin (the specific surface area is 12000 m)2/kg、SiO250% by mass of (A), Al2O350 percent by mass) and 1kg of fluxing agent lithium metaborate;
preparing raw materials of a cement-based shell layer: 13.44kg of cement, 2.8kg of fly ash, 1.34kg of silica fume, 8.51kg of water, 0.45kg of polycarboxylic acid type water reducing agent (water reducing rate is 28 percent) and 1.46kg of UEA type expanding agent.
Mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent according to the mass, and then granulating, wherein the particle size is 5-7mm, and the water content is 15%; preheating the spheres obtained by granulation at 600 ℃ for 25min, calcining at 1150 ℃ for 40min, and finally naturally cooling in air to room temperature to preliminarily obtain regenerated neutron irradiation resistant functional aggregates; and (2) dry-mixing the sintered aggregate, the cement, the fly ash, the silica fume and the expanding agent with the mass for 2min under a vacuum environment of 2kPa, adding water and a water reducing agent, continuously stirring for 8min, spreading the obtained regenerated lead material coating the cement-based material shell to avoid mutual cementation, naturally curing for 24h, then performing high-temperature high-pressure steam curing for 4h under the conditions of the temperature of 75 ℃ and the pressure of 2MPa, and cooling to room temperature to obtain the high-neutron irradiation resistance functional aggregate prepared by using the boron industrial waste residue, wherein the thickness of the shell of the obtained aggregate cement-based material is 0.69 mm.
Example 5
Preparing raw materials of boron industrial waste residue regenerated aggregates: 45kg of boric sludge (B)2O35 percent of calcium shale (15 percent of CaO, 10 percent of loss on ignition, and the grain diameter is less than or equal to 5mm), 25kg of metakaolin (12000 m of specific surface area)2/kg、SiO250% by mass of (A), Al2O350 percent by mass) and 3kg of fluxing agent lithium pyroborate;
preparing raw materials of a cement-based shell layer: 15.84kg of cement, 3.74kg of fly ash, 1.44kg of silica fume, 8.96kg of water, 0.41kg of polycarboxylic acid type water reducing agent (water reducing rate is 28 percent) and 1.6kg of UEA type expanding agent.
Mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent according to the mass, and then granulating, wherein the particle size is 5-7mm, and the water content is 15%; preheating the spheres obtained by granulation at 600 ℃ for 25min, calcining at 1150 ℃ for 40min, and finally naturally cooling in air to room temperature to preliminarily obtain regenerated neutron irradiation resistant functional aggregates; and (2) dry-mixing the sintered aggregate, the cement, the fly ash, the silica fume and the expanding agent with the mass for 2min under a vacuum environment of 2kPa, adding water and a water reducing agent, continuously stirring for 8min, spreading the obtained regenerated lead material coating the cement-based material shell to avoid mutual cementation, naturally curing for 24h, then performing high-temperature high-pressure steam curing for 4h under the conditions of the temperature of 80 ℃ and the pressure of 2MPa, and cooling to room temperature to obtain the high-neutron irradiation resistance functional aggregate prepared by using the boron industrial waste residue, wherein the thickness of the shell of the obtained aggregate cement-based material is 0.87 mm.
Comparative example 1
The raw material proportion and the preparation process of the irradiation-resistant functional aggregate prepared by utilizing the boron industrial slag are approximately the same as those in the embodiment 1, and the difference is that the amount of doped boron mud and the amount of calcareous shale during granulation of the regenerated aggregate are different and are as follows: 34kg of boric sludge and 35kg of calcareous shale.
Comparative example 2
The raw material proportion and the preparation process of the radiation-resistant functional aggregate prepared from the boron industrial slag are approximately the same as those of the embodiment 2, and the difference is that the raw material of the boron industrial slag regenerated aggregate does not contain a fluxing agent.
Comparative example 3
The raw material proportion and the preparation process of the radiation-resistant functional aggregate prepared by using the boron industrial slag are approximately the same as those of the aggregate prepared in the embodiment 2, and the difference is that the high-temperature high-pressure curing process is not carried out after the cement shell layer is coated by the regenerated aggregate.
Comparative example 4
An irradiation-resistant functional aggregate prepared from boron industrial slag, which is prepared from 42kg (B) of boron mud as raw material2O38 percent of calcium shale (25 percent of CaO, 8 percent of loss on ignition, and the grain diameter is less than or equal to 5mm), 31kg of calcium shale (22 kg of metakaolin (the specific surface area is 14000 m)2/kg、SiO260% by mass of Al2O340%) and 5kg of a flux lithium pyroborate.
Mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent according to the mass, and then granulating, wherein the particle size is 13-15mm, and the water content is 25%; preheating the spheres obtained by granulation at 800 ℃ for 40min, calcining at 1050 ℃ for 60min, and finally naturally cooling in air to room temperature to obtain the radiation-resistant functional aggregate.
Examples of the experiments
The high neutron irradiation resistance functional aggregate obtained in the above examples and comparative examples is tested for B element content, density, cylinder pressure strength, crushing index, water absorption and porosity, and the testing method is as follows:
(1) the content of boron element: and testing by inductively coupled plasma atomic emission spectrometry (ICP-AES).
(2) The testing methods of the density, the crushing index and the water absorption rate are tested according to the standard method specified in GBT 25177-2010 concrete recycled coarse aggregate;
(3) the test method of the cylinder pressure strength is carried out according to the standard method specified in GB/T17431.2-2010 lightweight aggregate and the test method thereof (part 2), lightweight aggregate test method;
(4) and (3) porosity testing:
and (3) measuring porosity by using a drainage method, namely randomly extracting 3 functional aggregates, putting a functional aggregate sample into vacuum water saturation equipment for vacuum water saturation, keeping the vacuum degree at 1-5 kPa, and keeping a water saturation test piece for 4 hours. Taking out the functional aggregate sample, and weighing the water retention mass MsTo the nearest 0.1 g.
Placing a water container on an electronic scale, binding functional aggregate by using a string, hanging the string above the water container, keeping the functional aggregate submerged by water in the container, not sinking to the bottom and not contacting with the wall of the container, and obtaining the real volume V of the aggregate by the difference of electronic scale readings before and after the aggregate is added.
All the aggregates were placed in an oven, the oven temperature was adjusted to 105 ℃, and drying was continued for 48 h. Taking the sample out of the oven, naturally cooling to room temperature, and weighing the mass MdTo the nearest 0.1 g. And calculating the porosity according to a formula.
Figure BDA0002619226290000111
The test results are shown in table 1.
TABLE 1
Table 1 test results of experimental example of neutron irradiation resistant functional aggregate in example and comparative example
Figure BDA0002619226290000112
Figure BDA0002619226290000121
As can be seen from the above table, the apparent density of the functional aggregate prepared by the method is 2500-3Within the interval, the apparent density is far lower than that of barite (4200-4600 kg/m)3) The density of the aggregate is similar to that of the cement-based slurry, so that the aggregate can be more uniformly distributed in the cement-based material, the homogeneity of concrete is ensured, the apparent density is not too low, the aggregate is sufficiently dense, and the strength and the water absorption performance are not influenced; meanwhile, the interfacial adhesion property of the aggregate and the cement paste is enhanced, and the using effect of the aggregate and the cement paste is ensured.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (12)

1. The aggregate with the irradiation resistance function is characterized by comprising boron industrial waste residue regenerated aggregate and a cement-based shell layer coated on the surface of the boron industrial waste residue regenerated aggregate;
the boron industrial waste residue regenerated aggregate comprises the following raw materials in percentage by weight: 42-50% of boric sludge, 27-35% of shale, 22-30% of metakaolin and 1-5% of fluxing agent;
the cement-based shell layer comprises the following raw materials in percentage by weight: 46-50% of cement, 10-13% of fly ash, 4.2-5.1% of silica fume, 25.6-30.7% of water, 1.0-1.6% of water reducing agent and 3.9-5.2% of expanding agent.
2. The aggregate having an irradiation resistance function according to claim 1, wherein the thickness of the cement-based shell layer is 0.5-1.2 mm.
3. The aggregate with radiation resistance function according to claim 1 or 2, wherein B in the boron mud2O3The mass fraction is more than or equal to 5 percent, and the water content is less than or equal to 4 percent.
4. The aggregate with the radiation-resistant function according to any one of claims 1 to 3, wherein the shale is calcareous shale, the mass fraction of CaO in the shale is more than or equal to 15%, the loss on ignition is less than or equal to 12%, and the particle size is less than or equal to 5 mm; the specific surface area of the metakaolin is more than or equal to 10000m2/kg，SiO2Mass fraction of Al is more than or equal to 50 percent2O3The mass fraction of the active carbon is more than or equal to 35 percent; the water reducing agent is a polycarboxylic acid type water reducing agent; the expanding agent is one or more of calcium sulphoaluminate expanding agents, calcium oxide expanding agents and calcium sulphoaluminate and calcium oxide compound expanding agents.
5. The aggregate having a radiation resistance function according to any one of claims 1 to 4, wherein the flux is a boron-based flux.
6. The method for preparing the aggregate with the radiation resistance function in any one of claims 1 to 5, which is characterized by comprising the following steps:
1) mixing and grinding the boric sludge, the shale, the metakaolin and the fluxing agent, and then granulating;
2) carrying out heat treatment on the ball obtained by granulation, and then naturally cooling to room temperature to obtain boron industrial waste residue regenerated aggregate;
3) mixing the boron industrial waste residue regenerated aggregate with cement, fly ash, silica fume and an expanding agent, adding water and a water reducing agent, continuously stirring, and then spreading and maintaining the obtained product;
4) and (5) steaming the cured product, and then cooling.
7. The method for preparing the aggregate with the radiation resistance function according to claim 6, wherein the particle size of the spheres obtained by granulation is 5-15mm, and the water content is 15-25%.
8. The method for preparing the aggregate with the radiation resistance function as claimed in claim 6 or 7, wherein the heat treatment conditions in the step 2) are preheating at 800 ℃ of 600 ℃ and 800 ℃ for 25-40min, and then calcining at 1150 ℃ of 1050 ℃ and 1150 ℃ for 40-60 min.
9. The method for preparing the aggregate with the radiation resistance function according to any one of claims 6 to 8, wherein the concrete preparation process of the step 3) is to dry mix the boron industrial waste residue regenerated aggregate with cement, fly ash, silica fume and an expanding agent for 1 to 3min under a vacuum environment of 2 to 5kPa, add water and a water reducing agent, continue stirring for 3 to 8min, then spread the obtained product and naturally maintain for 18 to 24 h.
10. The method for preparing the aggregate with the radiation resistance function according to any one of claims 6 to 9, wherein the steam-curing condition in the step 4) is as follows: the temperature is 60-80 ℃, the pressure is 1-2MPa, and the curing time is 4-12 h.
11. The method for preparing the aggregate with the radiation resistance function according to any one of claims 6 to 10, wherein the mass ratio of the total mass of the cement, the fly ash, the silica fume, the expanding agent, the water and the water reducing agent to the mass of the boron industrial residue regenerated aggregate is 0.22-0.45: 1.
12. Use of the aggregate with radiation resistance function of any one of claims 1 to 5 or the aggregate with radiation resistance function prepared by the method of any one of claims 6 to 11 in concrete.
CN202010778095.5A 2020-08-05 2020-08-05 Aggregate with irradiation resistance function and preparation method and application thereof Pending CN111847939A (en)

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CN115159900A (en) * 2022-04-21 2022-10-11 湖北工业大学 Preparation method of anti-radiation and anti-impact concrete
CN115572089A (en) * 2022-10-14 2023-01-06 武汉理工大学 Phosphogypsum aggregate, radiation-proof ultrahigh-performance concrete and preparation method thereof

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CN102849970A (en) * 2012-07-04 2013-01-02 武汉理工大学 Functional aggregate and preparation method thereof
CN103224369A (en) * 2013-04-09 2013-07-31 四川省交通运输厅公路规划勘察设计研究院 Anti-radiation concrete produced from slag aggregate, and production method thereof
CN106588117A (en) * 2016-12-12 2017-04-26 武汉理工大学 Anti-radiation functional aggregate prepared from Cr-containing and Zn-containing electroplating sludge

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CN102849970A (en) * 2012-07-04 2013-01-02 武汉理工大学 Functional aggregate and preparation method thereof
CN103224369A (en) * 2013-04-09 2013-07-31 四川省交通运输厅公路规划勘察设计研究院 Anti-radiation concrete produced from slag aggregate, and production method thereof
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* Cited by examiner, † Cited by third party
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CN115159900A (en) * 2022-04-21 2022-10-11 湖北工业大学 Preparation method of anti-radiation and anti-impact concrete
CN115572089A (en) * 2022-10-14 2023-01-06 武汉理工大学 Phosphogypsum aggregate, radiation-proof ultrahigh-performance concrete and preparation method thereof
CN115572089B (en) * 2022-10-14 2023-08-18 武汉理工大学 Phosphogypsum aggregate, radiation-proof ultra-high-performance concrete and preparation method thereof

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