CN112079603A - High-fluidity anti-neutron radiation concrete and preparation method thereof - Google Patents
High-fluidity anti-neutron radiation concrete and preparation method thereof Download PDFInfo
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- CN112079603A CN112079603A CN202010903538.9A CN202010903538A CN112079603A CN 112079603 A CN112079603 A CN 112079603A CN 202010903538 A CN202010903538 A CN 202010903538A CN 112079603 A CN112079603 A CN 112079603A
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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
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/02—Selection of uniform shielding materials
- G21F1/04—Concretes; Other hydraulic hardening materials
- G21F1/042—Concretes combined with other materials dispersed in the carrier
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-fluidity anti-neutron radiation concrete and a preparation method thereof, wherein the concrete comprises mixing water, a cementing material, a serpentine fine aggregate, a serpentine coarse aggregate and a polycarboxylic acid water reducing agent, wherein the cementing material comprises cement, metakaolin and fly ash microbeads, and the contents of the components are as follows in parts by weight: 210 parts of blending water 188-. The high-fluidity neutron radiation prevention concrete has the characteristics of high crystal water content, good working performance of concrete and convenience in construction, has higher practicability, and can be popularized and applied to nuclear radiation shielding construction in a large scale.
Description
Technical Field
The invention belongs to the technical field of nuclear power engineering, and particularly relates to a high-fluidity anti-neutron radiation concrete and a preparation method thereof.
Background
Shielding neutron flow mainly depends on adding light elements (hydrogen, boron, lithium and other elements) in the material, and the light elements can effectively absorb neutron radiation energy and prevent secondary radiation. The concrete has certain neutron radiation resistance, and the coarse aggregate in the concrete is replaced by serpentine rich in stable crystal water, so that the concrete can be used for more excellent neutron radiation resistance. Serpentine contains about 13% of crystal water, and the loss of the crystal water is less than 0.1% when the serpentine is burned at 450 ℃, but due to the particularity of aggregate, the serpentine concrete has the problems of low strength and poor working condition, or has high strength, poor working performance and good working performance, and the strength is low, so that the serpentine concrete and the aggregate are difficult to blend.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the high-fluidity anti-neutron radiation concrete which can effectively shield neutron radiation, can keep working at high temperature for a long time, has excellent workability and is easy to transport and construct while ensuring the strength. In addition, the invention also provides a preparation method of the high-fluidity neutron radiation prevention concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the invention, a high flow is providedThe sex anti-neutron radiation concrete comprises mixing water, a cementing material, serpentine fine aggregate, serpentine coarse aggregate and a polycarboxylic acid water reducing agent, wherein the cementing material comprises cement, metakaolin and fly ash microbeads, and the concrete comprises the following components in parts by weight: 210 parts of blending water 188-2The hydrogen content of the crystal water in the prepared concrete is not lower than 1.4 percent of the mass of the dried concrete, the strength is not lower than 30MPa, and the slump is more than 200 mm.
The preferable technical scheme comprises the following components in parts by weight: 188 parts of mixing water, 475 parts of cement, 50 parts of fly ash microbeads, 25 parts of metakaolin, 670 parts of fine aggregate, 930 parts of coarse aggregate and 1.2% of polycarboxylic acid water reducing agent by mass.
As a preferable technical scheme, the cement is P.O 42.5.5 ordinary portland cement, the content of tricalcium silicate in the portland cement is 55-65%, the content of dicalcium silicate is 15-25%, and the content of tricalcium aluminate is 5-10%. P.O 42.5.5 the cement can ensure better opposite property and convenient construction under the condition of ensuring the compression strength and the breaking strength of the concrete, and can hydrate more crystal water at the same time, thereby being beneficial to preventing neutron radiation.
As a preferable technical scheme, the sand rate of the neutron radiation prevention concrete is more than 40%.
As a preferred technical scheme, the particle size of the metakaolin is less than 1250 meshes.
In a second aspect of the present invention, there is provided a method for preparing a high-fluidity anti-neutron radiation concrete, for preparing the anti-neutron radiation concrete according to any one of claims 1 to 5, comprising the steps of:
step one, weighing mixing water, cement, metakaolin, fly ash microbeads, serpentine fine aggregate, serpentine coarse aggregate and polycarboxylic acid water reducing agent according to specific gravity;
and step two, uniformly mixing the components in the step one, and discharging to obtain the high-fluidity neutron radiation prevention concrete.
As a preferred technical scheme, in the second step, the coarse aggregate of the serpentine and the fine aggregate of the serpentine are added at the same time, the mixing water accounting for 1% of the total mass of the concrete is added for pre-wetting, the mixture is stirred for 2 minutes, then the cement, the fly ash microbeads, the metakaolin, the rest mixing water and the polycarboxylic acid water reducing agent are sequentially added, the mixture is stirred for 2 minutes, and then the material is discharged.
The workability of concrete and the quality of serpentine aggregate have a great relationship, the serpentine aggregate is generally used for fertilizer production and steel smelting, the serpentine used for construction is basically machine-made sand and machine-made stone, the serpentine is multilayer high-fiber stone, the serpentine is in a shape of a 'melon seed sheet' after being crushed, the fluidity of the concrete and the adsorption of an additive are greatly influenced, and multiple tests show that the large-particle-size sand and the high-asbestos fiber are main reasons influencing the workability of the concrete, so that the control of the fineness modulus and the fiber content of the serpentine fine aggregate is of great importance. The workability of the concrete containing serpentine aggregate is poor, and the shielding and protecting concrete needs the concrete to have no crack, so the sand rate of the concrete needs to be strictly controlled, and tests show that the sand rate of the concrete needs to be controlled to be more than 40 percent so as to meet the use requirement.
Due to various reasons such as serpentine production and the like, much screen residue of the serpentine coarse aggregate is concentrated in a large-particle-diameter range, the fiber content of the serpentine in different production places is different, a large amount of fibers can generate a dragging effect in concrete, the serpentine coarse aggregate with excessively concentrated particle size distribution and excessively high crushing index also has adverse effects on workability and strength, and even a sample crushing index exceeds 20% in the experimental process, so that the control of the fiber content of the serpentine coarse aggregate, the control of the screen residue distribution of the serpentine and the control of the crushing index of the serpentine are of great importance.
Mineral composition of serpentine MgO and SiO2The mass percentage of the serpentine is 43.6 percent, but the serpentine is inevitably mixed with impurities, and brucite is contained in serpentine in China and grows together with the serpentine, thus greatly affecting the material. The mass percentage of MgO to SiO2 in the serpentine can be judged through instrument analysis, so that the material quality can be controlled.
The working performance of the concrete can be better by doping the fly ash microbeads, the hydration heat during the concrete forming can be relieved for large-volume pouring, cracking is prevented, the addition of the fly ash microbeads is favorable for the later strength of cement, and the strength of the concrete is favorably improved according to the tight packing theory.
Metakaolin has a filling effect and a pozzolan gelling effect; is stable in high temperature environment, and can improve the strength of concrete. Meanwhile, the metakaolin has more Al2O3More stable crystal water can be bonded, and neutron radiation prevention is facilitated.
Compared with the prior art, the invention has the beneficial effects that:
(1) the high-fluidity neutron radiation prevention concrete has the characteristics of high crystal water content, good working performance of concrete and convenience in construction, has higher practicability, and can be popularized and applied to nuclear radiation shielding construction in a large scale.
(2) According to the invention, the workability and strength of the concrete are improved by controlling the crushing index and the fiber content of the serpentine aggregate, the fluidity of the concrete is improved by controlling the particle size of the serpentine aggregate, the strength of the concrete is improved by controlling the sand rate of the concrete, and the cracking of the concrete is avoided.
(3) The metakaolin is added, and can replace cement to improve the strength of concrete, increase the content of crystal water and improve the neutron radiation resistance of concrete.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment aims to provide a high-fluidity anti-neutron radiation concrete, which is prepared from mixing water, cement, fly ash microbeads, metakaolin, serpentine fine aggregate, serpentine coarse aggregate and a polycarboxylic acid water reducing agent, wherein the components in parts by weight are as follows: 210 parts of blending water 188-. The sand rate of the concrete is more than 40 percent.
Wherein the cement is P.O 42.5.5 ordinary portland cement, and the portland cement contains 55-65% of tricalcium silicate, 15-25% of dicalcium silicate and 5-10% of tricalcium aluminate. The cement is P.O 42.5.5 cement produced by conch cement.
The content of fiber in the serpentine coarse aggregate is less than 0.002 percent of the mass of the serpentine coarse aggregate, the crushing index is less than 8 percent, the particle size range is 3-40mm, no fiber can be seen by naked eyes in the serpentine fine aggregate, the fineness modulus is 2.5-2.8, the particle size range is 0-1.25mm, the mass percent of MgO in the serpentine fine aggregate is less than 43.6 percent, and the mass percent of MgO is less than that of SiO2In percentage by mass. The screen residue of the serpentine coarse aggregate is shown in table 1.
TABLE 1
| Mesh size | Range (mass percent) |
| 31.50 | 0 |
| 25.00 | 0-5 |
| 16 | 30-70 |
| 5 | 90-100 |
| 2.500 | 95-100 |
| Sifting residue | 100 |
The metakaolin is selected from high-activity metakaolin, and the particle size of the metakaolin is less than 1250 meshes.
The 803 high-efficiency polycarboxylic acid additive of Shanghai Jian Maister is selected as the polycarboxylic acid water reducing agent.
The preparation method of the large-fluidity anti-neutron radiation concrete comprises the following steps:
step one, weighing mixing water, cement, metakaolin, fly ash microbeads, serpentine fine aggregate, serpentine coarse aggregate and polycarboxylic acid water reducing agent according to specific gravity;
and step two, adding the serpentine coarse aggregate and the serpentine fine aggregate simultaneously, adding mixing water accounting for 1% of the total mass of the concrete, wetting in advance, stirring for 2 minutes, then sequentially adding the cement, the fly ash microspheres, the metakaolin, the rest mixing water and the polycarboxylic acid water reducing agent, stirring for 2 minutes, and then discharging.
According to the steps, the neutron radiation prevention serpentine concrete with the strength of more than 30MPa, the slump of 200mm and the expansion of 550 +/-20 mm and the hydrogen content of the crystal water in the concrete of not less than 1.4 percent of the mass of the dried concrete can be obtained.
The following will further explain with reference to example 1 and example 2, wherein the compounding ratio of each component in example 1 is shown in Table 2, and the properties of the concrete obtained in example 1 are shown in Table 3.
TABLE 2
TABLE 3
| Item | Slump constant | 28 day compressive strength | Hydrogen content |
| Index (I) | 200mm | 36.6MPa | 1.55％ |
The proportions of the components in example 2 are shown in Table 4, and the properties of the concrete obtained in example 2 are shown in Table 5.
TABLE 4
TABLE 5
| Item | Slump constant | 28 day compressive strength | Hydrogen content |
| Index (I) | 210mm | 35.3MPa | 1.53％ |
Examples 1 and 2 show that the neutron radiation prevention serpentine concrete with hydrogen content of more than 1.5 percent and 28-day compressive strength of more than 30Mpa is obtained by the method.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (7)
1. The high-fluidity anti-neutron radiation concrete is characterized by comprising mixing water, a cementing material, a serpentine fine aggregate, a serpentine coarse aggregate and a polycarboxylic acid water reducing agent, wherein the cementing material comprises cement, metakaolin and fly ash microbeads, and the contents of the components are as follows in parts by weight: mixing water 188-210 parts, cement 425-475 parts, metakaolin 25 parts and fly ash microbeads50 parts of serpentine fine aggregate, 670 parts of serpentine coarse aggregate 930-960 parts of the serpentine coarse aggregate and polycarboxylic acid water reducer, wherein the mass of the polycarboxylic acid water reducer is 1.0-1.2% of the mass of the cementing material, the fiber content of the serpentine coarse aggregate is less than 0.002% of the mass of the serpentine coarse aggregate, the crushing index is less than 8%, the particle size range is 3-40mm, no macroscopic fiber exists in the serpentine fine aggregate, the fineness modulus is 2.5-2.8, the particle size range is 0-1.25mm, the mass percentage of MgO in the serpentine fine aggregate is less than 43.6%, and the mass percentage of MgO is less than that of SiO2The hydrogen content of the crystal water in the prepared concrete is not lower than 1.4 percent of the mass of the dried concrete, the strength is not lower than 30MPa, and the slump is more than 200 mm.
2. The high-fluidity neutron radiation prevention concrete according to claim 1, which comprises the following components in parts by weight: 188 parts of mixing water, 475 parts of cement, 50 parts of fly ash microbeads, 25 parts of metakaolin, 670 parts of fine aggregate, 930 parts of coarse aggregate and 1.2% of polycarboxylic acid water reducing agent by mass.
3. The high-fluidity neutron radiation prevention concrete according to claim 1, wherein the cement is P.O 42.5.5 ordinary portland cement, the content of tricalcium silicate in the portland cement is 55-65%, the content of dicalcium silicate is 15-25%, and the content of tricalcium aluminate is 5-10%.
4. The high-fluidity neutron radiation protection concrete according to claim 1, wherein the sand rate of the neutron radiation protection concrete is more than 40%.
5. The high-fluidity neutron radiation protection concrete according to claim 1, wherein the particle size of the metakaolin is less than 1250 mesh.
6. A preparation method of high-fluidity anti-neutron radiation concrete for preparing the anti-neutron radiation concrete of any one of claims 1 to 5, which is characterized by comprising the following steps:
step one, weighing mixing water, cement, metakaolin, fly ash microbeads, serpentine fine aggregate, serpentine coarse aggregate and polycarboxylic acid water reducing agent according to specific gravity;
and step two, uniformly mixing the components in the step one, and discharging to obtain the high-fluidity neutron radiation prevention concrete.
7. The method for preparing high-fluidity anti-neutron radiation concrete according to claim 6, wherein in the second step, the coarse aggregate of serpentine and the fine aggregate of serpentine are added at the same time, the mixing water accounting for 1% of the total mass of the concrete is added for pre-wetting, the stirring is carried out for 2 minutes, then the cement, the fly ash micro-beads, the metakaolin, the rest mixing water and the polycarboxylic acid water reducing agent are sequentially added, and the discharging is carried out after the stirring is carried out for 2 minutes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113831043A (en) * | 2021-09-30 | 2021-12-24 | 西南科技大学 | Comprehensive utilization method of chrysotile mine stripped waste rock and building material thereof |
| CN113912341A (en) * | 2021-09-23 | 2022-01-11 | 中国核电工程有限公司 | Concrete material for neutron absorption and shielding and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113912341A (en) * | 2021-09-23 | 2022-01-11 | 中国核电工程有限公司 | Concrete material for neutron absorption and shielding and preparation method thereof |
| CN113831043A (en) * | 2021-09-30 | 2021-12-24 | 西南科技大学 | Comprehensive utilization method of chrysotile mine stripped waste rock and building material thereof |
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