CN115124301A - Low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete - Google Patents
Low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete Download PDFInfo
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- CN115124301A CN115124301A CN202210590636.0A CN202210590636A CN115124301A CN 115124301 A CN115124301 A CN 115124301A CN 202210590636 A CN202210590636 A CN 202210590636A CN 115124301 A CN115124301 A CN 115124301A
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0641—Polyvinylalcohols; Polyvinylacetates
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00862—Uses not provided for elsewhere in C04B2111/00 for nuclear applications, e.g. ray-absorbing concrete
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete which comprises 650 plus 750kg/m 3 130-180kg/m 3 Fly ash micro-bead, 120-170kg/m 3 60-120kg/m of silica fume 3 700-1100kg/m barite powder 3 250-700kg/m artificial radiation-proof aggregate 3 100-200kg/m of barite sand 3 20-40kg/m of copper-plated steel fiber 3 21-30.5kg/m of polymer fiber 3 50-100kg/m of water reducing agent 3 And water. The invention utilizes artificial defenseThe radiation aggregate has the advantage of relatively low apparent density, the sinking trend of the heavy aggregate in cement paste is slowed down, the structure of an interface transition region is improved, the compactness and integrity of the ultra-high performance concrete are increased, and the mechanical property, the radiation protection performance and the durability of the concrete are improved.
Description
Technical Field
The invention relates to the field of building materials, in particular to low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete.
Background
Along with the rapid development of nuclear technology in China, the harm brought by nuclear radiation is larger and larger, so the requirement on the performance of the radiation-proof concrete is higher and higher, and along with the development of science and technology, the research on the radiation-proof and high-performance concrete is gradually developed, and the ultrahigh-performance concrete has better application prospects in various fields due to the ultrahigh durability and the ultrahigh mechanical property, so the research on the radiation-proof ultrahigh-performance concrete is indispensable.
In the design of radiation-proof concrete, some natural ores with large apparent density, such as barite, serpentine and magnetite, can effectively block the penetration of rays due to large atomic number and high apparent density, and are commonly used as concrete aggregates by scholars at home and abroad. The natural ore aggregate has an apparent density of 3.0 to 5.0 x 10 3 kg/m 3 ) With other components (2.6-3.0X 10) of concrete 3 kg/m 3 ) Compared with aggregates with larger phase difference and higher apparent density, aggregates with higher apparent density have stronger sinking tendency, and in the concrete pouring and vibrating process, the aggregates will guideThe cement paste and the aggregate are seriously layered, so that the working performance, the mechanical performance and the radiation-proof performance of the concrete are reduced to a certain degree. The natural ore belongs to non-renewable resources, and a substitute of the natural ore is required to be used as the radiation-proof aggregate.
Disclosure of Invention
The invention aims to solve the problems and provide the radiation-proof ultra-high performance concrete with low shrinkage and high abrasion resistance, thereby improving the mechanical property and the durability of the radiation-proof concrete and ensuring the radiation-proof concrete to have excellent radiation-proof performance.
In order to achieve the purpose, the invention adopts the technical scheme that:
the low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete comprises the following components: 650-750kg/m 3 130-180kg/m 3 Fly ash micro-bead, 120-170kg/m 3 60-120kg/m of silica fume 3 700-1100kg/m barite powder 3 250-700kg/m artificial radiation-proof aggregate 3 100-200kg/m of barite sand 3 20-40kg/m of copper-plated steel fiber 3 21-30.5kg/m of polymer fiber 3 50-100kg/m of water reducing agent 3 170-200 kg/m of the expanding agent 3 The water of (2).
The cement is P.O 42.5 or P.O 52.5 portland cement.
Furthermore, the ignition loss of the fly ash micro-beads is less than or equal to 5.0 percent, the water demand ratio is less than or equal to 90 percent, and the volume ratio of the spherical particles is more than or equal to 95 percent.
Further, SiO of the silica fume 2 The mass content is more than or equal to 95 percent, and the specific surface area is more than or equal to 15500m 2 The activity index of/kg, 28d is more than or equal to 100 percent.
Further, the apparent density of the barite powder is 4300kg/m 3 。
Further, the artificial radiation-proof aggregate is of a core-shell structure, the fineness modulus is 2.5-3.2, the crushing value is less than or equal to 20%, and the apparent density is 2800-3300 kg/m 3 The porosity is 15-20%, and the saturated surface dry water absorption is 6.0-9.0%.
Further, the artificial radiation-proof aggregate is prepared by uniformly mixing the main material and the auxiliary material, preheating and calcining in a stepped manner in a high-temperature furnace, and then air-cooling along with the furnace after calcining is finished; the raw materials comprise, by mass, 50 parts of a main material and 1-5 parts of an auxiliary material; the main material is one of urban sludge, sludge or industrial waste; the auxiliary material is one of kaolin or clay.
Further, the calcination system is that the preheating temperature is 200 ℃, the preheating time is 15min, the staged calcination system is to heat from 200 ℃ to 450 ℃ and preserve heat for 20-40 min, then preserve heat for 20-45 min at 650 ℃, and finally preserve heat for 45min at 1050 ℃ -1150 ℃, wherein the temperature rise rate of each stage is not higher than 10 ℃.
Furthermore, the fineness modulus of the barite sand is 2.1-2.7, and the apparent density is 4300kg/m 3 。
Furthermore, the nominal length of the copper-plated steel fiber is 10-16 mm, the equivalent diameter is 0.18-0.35 mm, the breaking strength is larger than or equal to 3000MPa, and the elastic modulus is 200-220 GPa.
Further, the polymer fiber is one or two of polypropylene fiber and PVA fiber.
Further, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the solid content is 49-51%, and the water reducing rate is 26-29%.
Further, the expanding agent is an HME type expanding agent.
The invention has the beneficial effects that:
1. the artificial radiation-proof aggregate is adopted to partially replace the heavy aggregate to prepare the low-shrinkage high-impact radiation-proof ultrahigh-performance concrete, the problem of large shrinkage of the existing ultrahigh-performance concrete can be solved to a certain extent by utilizing the internal curing function of the concrete and combining the expanding agent, the sinking trend of the heavy aggregate in cement paste is slowed down by utilizing the advantage of relatively low apparent density of the artificial radiation-proof aggregate, the structure of an interface transition area is improved, the compactness and the integrity of the ultrahigh-performance concrete can be further increased, and the mechanical property, the radiation-proof performance and the durability of the radiation-proof concrete are improved. In addition, the problems of lack of natural ore resources and the like of the radiation-proof concrete common aggregate can be effectively solved, the effective utilization of the urban sludge, the sludge and the industrial waste containing the heavy metals is realized, and the sustainable development concept is met.
2. As is well known, the shielding performance of the radiation-proof concrete is mainly related to the apparent density and heavy atoms of the concrete, and the radiation-proof concrete is prepared by completely replacing heavy aggregate with artificial radiation-proof aggregate with lower apparent density, although heavy elements exist, the apparent density of the concrete is relatively lower, so that the method of partially replacing the heavy aggregate with the artificial radiation-proof aggregate is adopted, and part of barite powder is used for replacing a cementing material, so that the apparent density of the concrete is ensured to be at a higher level, the heat release of hydration of the cement is further reduced, and the concrete has good shielding performance and good mechanical performance and durability.
3. The mixed fiber (steel fiber and PVA fiber or steel fiber and polypropylene fiber) adopted by the invention can enable the fiber to form three-dimensional disorderly distribution in the concrete, thereby limiting the development of cracks, improving the compactness of the concrete, improving the mechanical property, durability and shielding property of the concrete, and simultaneously, the doping of the polymer fiber enables H atoms in the concrete to be greatly increased, and the shielding effect on neutrons is better.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Examples 1 to 3
An environment-friendly artificial radiation-proof aggregate, the preparation method comprises the following steps: weighing the raw materials according to the proportion shown in the table 1, uniformly mixing the main material and the auxiliary material, and performing staged calcination in a high-temperature furnace, wherein the calcination system is shown in the table 1, and performing air cooling along with the furnace after calcination to obtain the artificial radiation-proof aggregate, and the measured physical properties are shown in the table 2.
Table 1 raw material ratio and calcination System of the artificial radiation-proof aggregate in examples 1 to 3
Table 2 physical property indexes of the artificial radiation-proof aggregate in examples 1 to 3
Table 2 shows that: the artificial anti-radiation aggregate obtained in the embodiments 1 to 3 has a crushing value of not more than 20%, a water absorption of 6 to 9%, and an apparent density of 2800 to 3300kg/m 3 The porosity is 15-20%, and the physical property is excellent.
Examples 4 to 12
In the following embodiment, a low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete is provided, and the concrete comprises the following components in percentage by weight: cement: 650-750kg/m 3 Fly ash microbeads: 130-180kg/m 3 And (3) silica fume: 120-170kg/m 3 Barite powder: 60-120kg/m 3 Artificial radiation-proof aggregate: 700-1100kg/m 3 Barite sand: 250-700kg/m 3 Plating copper on steel fiber: 100- 3 The polymer fiber: 20-40kg/m 3 Water reducing agent: 21-30.5kg/m 3 And the swelling agent: 50-100kg/m 3 Water: 170 to 200kg/m 3 . Wherein the cement is Huaxin P.O 52.5 ordinary portland cement; the silica fume is provided by Shanghai Tian happy silicon powder materials Co., Ltd, SiO 2 The mass content is 95 percent, and the specific surface area is 17500m 2 Kg, 28d activity index 105%; the fly ash micro-beads are provided by Kyochengjiade (Beijing) commercial Co., Ltd, the ignition loss is 3.5%, the water demand ratio is 88%, and the volume percentage of spherical particles is 97%; the apparent density of the barite powder is 4300kg/m 3 (ii) a The artificial radiation-proof aggregate is of a core-shell structure, the fineness modulus is 2.5-3.2, the crushing value is less than or equal to 20%, and the apparent density is 2800-3300 kg/m 3 The porosity is 15-20%, and the saturated surface dry water absorption is 6.0-9.0%; the fineness modulus of barite sand is 2.1-2.7, and the apparent density is 4300kg/m 3 (ii) a The copper-plated steel fiber is produced by Wuhan new-path engineering new material science and technology Limited, and has a nominal length of 13mm, an equivalent diameter of 0.25mm, a breaking strength of about 3500MPa and an elastic modulus of about 52 GPa; the polymer fiber is one or two of polypropylene fiber and PVA fiber; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agentThe solid content is 49-51%, and the water reducing rate is 26-29%; the expanding agent is HME type expanding agent; the water is ordinary tap water.
The preparation method of the low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete comprises the following steps:
A. weighing the raw materials according to the proportion in the table 3;
B. firstly, putting the weighed artificial radiation-proof aggregate into water to be soaked for 1d to a water-saturated state to obtain pre-wet artificial radiation-proof aggregate, adding the pre-wet artificial radiation-proof aggregate, barite sand, cement, silica fume, fly ash microbeads, barite powder and an expanding agent into a concrete mixer for pre-mixing, then pouring water and a polycarboxylic acid high-efficiency water reducing agent for stirring, uniformly adding copper-plated steel fibers and polymer fibers for continuous stirring; and finally, after the steps of mold filling, vibrating and forming, covering a waterproof film on the surface, and after 1d, removing the mold and curing to a set age to obtain the low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete. The performance test results of the low-shrinkage high-abrasion-resistance radiation-proof ultrahigh-performance concrete obtained in each example are shown in tables 4 and 5.
Table 3 mixing ratio (kg/m) of artificial radiation-proof aggregate radiation-proof UHPC (ultra high performance polycarbonate) described in examples 4-12 3 )
Table 4 test results of radiation protection UHPC performance of artificial radiation protection aggregate described in examples 4-12
Table 5 results of tests on radiation resistance of artificial radiation-resistant aggregate and UHPC in examples 4 to 12
The results show that the low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete obtained by the invention has good physical and mechanical properties and working performance, and has the advantages of high strength, low shrinkage, high impact resistance, high durability, high shielding performance and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The anti-radiation ultrahigh-performance concrete with low shrinkage and high impact resistance is characterized by comprising the following components: 650-750kg/m 3 130-180kg/m 3 Fly ash micro-bead, 120-170kg/m 3 60-120kg/m of silica fume 3 700-1100kg/m barite powder 3 250-700kg/m artificial radiation-proof aggregate 3 100-200kg/m of barite sand 3 20-40kg/m of copper-plated steel fiber 3 21-30.5kg/m of polymer fiber 3 50-100kg/m of water reducing agent 3 170 to 200kg/m of the expanding agent 3 The water of (2).
2. The low-shrinkage high-impact-resistant-grinding radiation-proof ultrahigh-performance concrete according to claim 1, characterized in that the loss on ignition of the fly ash microbeads is less than or equal to 5.0%, the water demand ratio is less than or equal to 90%, and the volume ratio of the spherical particles is more than or equal to 95%.
3. The low shrinkage high impact resistant radiation protective ultra high performance concrete of claim 1, wherein said silica fume SiO 2 The mass content is more than or equal to 95 percent, and the specific surface area is more than or equal to 15500m 2 The activity index of/kg, 28d is more than or equal to 100 percent.
4. The low-shrinkage high-impact-wear-resistant radiation-proof ultrahigh-performance concrete according to claim 1, characterized in that the artificial radiation-proof aggregate is of a core-shell structure, the fineness modulus is 2.5-3.2, the crushing value is less than or equal to 20%, and the apparent density is 2800-3300 kg/m 3 The porosity is 15-20%, and the saturated surface dry water absorption is 6.0-9.0%.
5. The low-shrinkage high-impact-resistant-grinding radiation-proof ultrahigh-performance concrete according to claim 4, wherein the artificial radiation-proof aggregate is prepared by uniformly mixing main materials and auxiliary materials, preheating and carrying out stepped calcination in a high-temperature furnace, and then carrying out air cooling in the furnace after calcination; the raw materials comprise, by mass, 50 parts of a main material and 1-5 parts of an auxiliary material; the main material is one of urban sludge, sludge or industrial waste; the auxiliary material is one of kaolin or clay.
6. The low-shrinkage high-impact-resistant-abrasion-resistant radiation-proof ultrahigh-performance concrete according to claim 5, wherein the calcination system is that the preheating temperature is 200 ℃, the preheating time is 15min, the staged calcination system is that the concrete is heated from 200 ℃ to 450 ℃ and is subjected to heat preservation for 20-40 min, then is subjected to heat preservation for 20-45 min at 650 ℃, and is finally subjected to heat preservation for 45min at 1050 ℃ -1150 ℃, wherein the temperature rise rate of each stage is not higher than 10 ℃.
7. The low-shrinkage high-impact-resistant-wear-resistant radiation-proof ultrahigh-performance concrete according to claim 1, wherein the fineness modulus of the barite sand is 2.1-2.7, and the apparent density is 4300kg/m 3 。
8. The low-shrinkage high-impact-abrasion-resistant radiation-proof ultrahigh-performance concrete according to claim 1, wherein the polymer fibers are one or both of polypropylene fibers and PVA fibers.
9. The low-shrinkage high-impact-wear-resistant radiation-proof ultrahigh-performance concrete according to claim 1, characterized in that the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the solid content is 49-51%, and the water reducing rate is 26-29%.
10. The low shrinkage high impact resistant radiation protective ultra high performance concrete according to claim 1, wherein the expanding agent is an HME type expanding agent.
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| CN115572125A (en) * | 2022-10-08 | 2023-01-06 | 新特新材料集团(河南)股份有限公司 | Medium-low radioactive nuclear waste curing and packaging material |
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| CN115572125A (en) * | 2022-10-08 | 2023-01-06 | 新特新材料集团(河南)股份有限公司 | Medium-low radioactive nuclear waste curing and packaging material |
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