CN113121171A - Radiation-proof self-compacting concrete and preparation method thereof - Google Patents
Radiation-proof self-compacting concrete and preparation method thereof Download PDFInfo
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- 239000011376 self-consolidating concrete Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000004568 cement Substances 0.000 claims abstract description 49
- 239000004567 concrete Substances 0.000 claims abstract description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000005855 radiation Effects 0.000 claims abstract description 25
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000003381 stabilizer Substances 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000004575 stone Substances 0.000 claims abstract description 17
- 229910052601 baryte Inorganic materials 0.000 claims abstract description 16
- 239000010428 baryte Substances 0.000 claims abstract description 16
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052796 boron Inorganic materials 0.000 claims abstract description 15
- 229910052788 barium Inorganic materials 0.000 claims abstract description 13
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 12
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 12
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 11
- 238000005056 compaction Methods 0.000 claims abstract description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 7
- 229940114930 potassium stearate Drugs 0.000 claims description 7
- ANBFRLKBEIFNQU-UHFFFAOYSA-M potassium;octadecanoate Chemical compound [K+].CCCCCCCCCCCCCCCCCC([O-])=O ANBFRLKBEIFNQU-UHFFFAOYSA-M 0.000 claims description 7
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 claims description 6
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 6
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 6
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 6
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 6
- YLGXILFCIXHCMC-JHGZEJCSSA-N methyl cellulose Chemical compound COC1C(OC)C(OC)C(COC)O[C@H]1O[C@H]1C(OC)C(OC)C(OC)OC1COC YLGXILFCIXHCMC-JHGZEJCSSA-N 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 claims description 6
- 229910052642 spodumene Inorganic materials 0.000 claims description 6
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 229910052629 lepidolite Inorganic materials 0.000 claims description 4
- 229910052613 tourmaline Inorganic materials 0.000 claims description 4
- 229940070527 tourmaline Drugs 0.000 claims description 4
- 239000011032 tourmaline Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005204 segregation Methods 0.000 abstract description 9
- -1 admixture Substances 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 230000000694 effects Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000005025 nuclear technology Methods 0.000 description 4
- 239000002910 solid waste Substances 0.000 description 4
- 230000003471 anti-radiation Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000000191 radiation effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- QYHKLBKLFBZGAI-UHFFFAOYSA-N boron magnesium Chemical compound [B].[Mg] QYHKLBKLFBZGAI-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- UXBZSSBXGPYSIL-UHFFFAOYSA-N phosphoric acid;yttrium(3+) Chemical compound [Y+3].OP(O)(O)=O UXBZSSBXGPYSIL-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910000164 yttrium(III) phosphate Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00258—Electromagnetic wave absorbing or shielding materials
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a radiation-proof self-compacting concrete and a preparation method thereof, the components comprise radiation-proof cement, admixture, iron tailing sand, barite broken stone, high-efficiency water reducing agent, rheological agent, stabilizing agent and water, the radiation-proof cement is one of barium cement and strontium cement, the admixture is a mixture of boron-containing ore and lithium-containing ore, and the mixture ratio of each component is 440-480 kg/m of the radiation-proof cement3220-260 kg/m of admixture31020-1060 kg/m iron tailing sand32250-2290 kg/m of barite crushed stone310-14 kg/m of high-efficiency water reducing agent34-8 kg/m of rheological agent31 to 4kg/m stabilizer3The water-cement ratio is controlled within the range of 0.36-0.40. The invention can ensure the radiation protection performance and the mechanical strength of the concrete while realizing high fluidity, segregation resistance and self-compaction of the concrete, and has the advantages of environmental protection and low cost.
Description
Technical Field
The invention belongs to the technical field of concrete building materials, and particularly relates to radiation-proof self-compacting concrete and a preparation method thereof.
Background
The first criterion for nuclear technology utilization is safety and radiation protection, and with the rapid development of the fields of nuclear power, scientific research, medical treatment, military affairs and the like, the demand of nuclear technology application on radiation-proof materials, particularly radiation-proof concrete, is greatly increased.
The existing radiation-proof concrete has the workability problems of poor fluidity, easy bleeding, segregation and the like, and the problems of uneven internal structure, low strength after hardening, reduced radiation-proof performance and the like caused by easy layering of the concrete in the construction vibration process because the aggregate density of the radiation-proof concrete is high and the self-leveling and self-compacting cannot be realized.
Chinese patent CN201711164900.X discloses a high-strength radiation-proof pumpable concrete and a preparation method thereof, which do not meet the working requirement of self-compacting concrete, have single radiation-proof property and cannot effectively slow neutron flow; chinese patent CN201911356309.3 discloses a radiation-proof concrete with high H element content and a preparation method thereof, which does not meet the working requirement of self-compacting concrete, has single radiation-proof property, can only moderate neutron flow and has poor shielding effect on other rays; chinese patent CN201710642862.8 discloses a radiation-proof concrete and a preparation method thereof, which can not meet the workability requirement of self-compacting concrete and needs to be vibrated and formed.
From the above, the existing radiation-proof concrete cannot simultaneously meet the requirements of high fluidity, high segregation resistance and good radiation-proof performance of the radiation-proof self-compacting concrete.
Disclosure of Invention
The invention aims to provide radiation-proof self-compacting concrete and a preparation method thereof, and the radiation-proof self-compacting concrete can ensure the radiation protection performance and the mechanical strength of the concrete while realizing high fluidity, segregation resistance and self-compacting of the concrete, and is environment-friendly and low in cost.
The technical scheme adopted by the invention is as follows:
the radiation-proof self-compacting concrete comprises radiation-proof cement, an admixture, iron tailing sand, barite broken stone, a high-efficiency water reducing agent, a rheological agent, a stabilizer and water, wherein the radiation-proof cement is one of barium cement and strontium cement, the admixture is a mixture of boron-containing ore and lithium-containing ore, and the proportion of each component is 440-480 kg/m of the radiation-proof cement3220-260 kg/m of admixture31020-1060 kg/m iron tailing sand32250-2290 kg/m of barite crushed stone310-14 kg/m of high-efficiency water reducing agent34-8 kg/m of rheological agent31 to 4kg/m stabilizer3The water-cement ratio is controlled within the range of 0.36-0.40.
Preferably, the admixture is obtained by grinding the boron-containing ore and the lithium-containing ore according to the ratio of 1: 1, and the specific surface area is not less than 450m2A mixture of/kg.
Preferably, the boron-containing ore is one of boromagnesite, borosillimanite, borobainite and tourmaline; the lithium-containing ore is one of spodumene, lepidolite and phospholithionite.
Preferably, the fineness modulus of the iron tailings sand is 2.6, and the powder content is not more than 3%.
Preferably, the content of barium sulfate in the barite crushed stone is not less than 80%, and the particle size is 5-10 mm.
Preferably, the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Preferably, the rheological agent is one or a mixture of more than two of potassium stearate and sodium stearate in any proportion.
Preferably, the stabilizer is one or a mixture of more than two of methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether in any proportion.
Firstly, sequentially adding barite crushed stone, iron tailing sand, radiation-proof cement and admixture into a stirrer according to the proportion, and performing dry stirring for 1-2 min to uniformly mix; then sequentially adding a rheological agent and a stabilizing agent according to the proportion, dry-mixing for 2-3 min, and fully mixing; and finally, adding a high-efficiency water reducing agent and water according to the proportion, and mixing for 3-4 min to finish the preparation.
The invention has the beneficial effects that:
the invention can realize high fluidity, segregation resistance and self-compaction of concrete, and the concrete is similar to a continuum by optimizing the grain composition of a concrete system and has certain fluidity under the condition of dry materials without adding water; the radiation-proof cement (one of barium cement and strontium cement) is used as a cementing material, the iron tailing sand is used as fine aggregate, and the barite crushed stone with smaller particles reduces the density difference between powder and aggregate and reduces the sedimentation of the aggregate in slurry; through the high dispersion and surface modification effects of the high-efficiency water reducing agent and the rheological agent, the fluidity of the radiation-proof concrete is greatly improved, the vibration is not needed, and the template can be filled in through a steel bar gap under the action of the self weight; under the action of the stabilizer, the consistency and viscosity of the concrete mixture are regulated and controlled according to actual requirements, high fluidity is guaranteed, meanwhile, the concrete mixture has high water retention and segregation resistance, and even if high-density aggregate exists in concrete, the homogeneity of a concrete system can be guaranteed. The radiation-proof self-compacting concrete dry material provided by the invention has the characteristics of continuous fluid, and the lubricating effect of the rheological agent and the water-retaining thickening and viscosity-adjusting effect of the stabilizing agent ensure that the concrete has excellent workability, is not layered or segregated under the condition of keeping large fluidity, has good steel bar clearance trafficability, ensures that the self-compacting concrete with high apparent density is filled in a template with a complex shape under the vibration effect of no external force, has good filling degree, and realizes self-leveling self-compacting.
The invention can ensure the radiation protection performance and the mechanical strength of concrete, namely, the radiation protection performance and the mechanical strength of concrete can effectively shield the radiation effect of various rays by using the gelled material (one of radiation-proof cement, barium cement and strontium cement) containing heavy metals and the coarse aggregate (admixture, mixture of boron-containing ore and lithium-containing ore), and by doping the boron-containing mineral admixture, boron element in the concrete can absorb a large amount of slow neutrons, is an element with good absorption and shielding effects on neutrons, is an important neutron ray absorbent, and further realizes the effective shielding of neutron rays; a large amount of amorphous active lithium salt, silicon dioxide and aluminum oxide are provided by the high-doping amount of mineral admixture, and are subjected to secondary hydration reaction with cement hydration products, so that the strength and durability of concrete are improved; the iron tailing sand is used as fine aggregate, and the heavy fine aggregate also has the function of ray shielding. Namely, the radiation-proof self-compacting concrete provided by the invention contains shielding elements such as barium, strontium, iron, lithium, boron and the like with good radiation protection function, can effectively shield various rays generated in the application process of nuclear technology, can effectively moderate neutrons, realizes multi-element shielding, reduces radiation hazards, and has excellent radiation protection performance.
The invention uses industrial solid waste to replace partial aggregate, is environment-friendly and low in cost, and uses iron tailing sand as fine aggregate, thereby consuming industrial solid waste and saving natural mineral resources.
Detailed Description
The present invention will be further described with reference to the following examples.
In the following examples, reagents used were commercially available industrial products or chemical reagents unless otherwise specified.
In the following examples, the starting materials used: the radiation-proof cement is barium cement or strontium cement; the admixture is one of boromagnesite, borosillimanite, boronotronite and tourmaline and one of spodumene, lepidolite and xenotime which are ground according to the proportion of 1: 1, and the specific surface area of the admixture is not less than 450m2A mixture of/kg; the fineness modulus of the iron tailing sand is 2.6, the powder content is 2.4 percent, the crushing index is 16 percent, and the apparent density is 2905kg/m3(ii) a The barite crushed stone is 5-10 mm continuous graded barite crushed stone, the content of barium sulfate is 82.2%, the crushing value is 6.3%, and the apparent density is 4221kg/m3(ii) a The high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the solid content is 25 percent, and the water reducing rate is 26 percent; the rheological agent is one or a mixture of two of potassium stearate and sodium stearate in any proportion; the stabilizer is one or a mixture of two or more of methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether according to any proportion.
In the following examples, the preparation method of the radiation-proof self-compacting concrete comprises the following steps: sequentially adding barite crushed stone, iron tailing sand, radiation-proof cement and admixture into a stirrer according to the proportion, and performing dry stirring for 1-2 min to uniformly mix; then sequentially adding a rheological agent and a stabilizing agent according to the proportion, dry-mixing for 2-3 min, and fully mixing; and finally, adding a high-efficiency water reducing agent and water according to the proportion, and mixing for 3-4 min to perform pouring construction of the radiation-proof self-compacting concrete.
Example one
The mixing proportion of the radiation-proof self-compacting concrete is shown in table 1.
TABLE 1 example A radiation protective self-compacting concrete mix ratio (kg/m)3)
Wherein the radiation-proof cement is strontium cement; the admixture is prepared by grinding the boron-magnesium stone and the spodumene according to the proportion of 1: 1, and the specific surface area is 462m2A mixture of/kg; the rheological agent is potassium stearate; the stabilizer is methyl cellulose ether.
Example two
The mixing proportion of the radiation-proof self-compacting concrete is shown in table 2.
TABLE 2 example two anti-radiation self-compacting concrete mix proportion (kg/m)3)
Wherein the radiation-proof cement is strontium cement; the admixture is 466m in specific surface area obtained by grinding the borosillimanite and the lepidolite according to the proportion of 1: 12A mixture of/kg; the rheological agent is potassium stearate; the stabilizer is hydroxyethyl methyl cellulose ether.
EXAMPLE III
The mixing proportion of the radiation-proof self-compacting concrete is shown in table 3.
TABLE 3 example three-proofing radiation self-compacting concrete mix proportion (kg/m)3)
Wherein the radiation-proof cement is barium cement; the admixture is prepared by grinding the borocalcite and the phospholithionite according to the ratio of 1: 1, and the specific surface area of the admixture is 459m2A mixture of/kg; the rheological agent is sodium stearate; the stabilizer is hydroxypropyl methyl cellulose ether.
Example four
The mixing proportion of the radiation-proof self-compacting concrete is shown in table 4.
TABLE 4 example four anti-radiation self-compacting concrete mix proportions (kg/m)3)
Wherein the radiation-proof cement is barium cement; the admixture is obtained by grinding tourmaline and spodumene at a ratio of 1: 1 to obtain a powder with a specific surface area of 456m2A mixture of/kg; the rheological agent is a mixture of sodium stearate and potassium stearate with the mass ratio of 1: 3; the stabilizer is a mixture of methyl cellulose ether and hydroxypropyl methyl cellulose ether in a mass ratio of 2: 3.
EXAMPLE five
The mixing proportion of the radiation-proof self-compacting concrete is shown in table 5.
TABLE 5 examples five anti-radiation self-compacting concrete mix proportions (kg/m)3)
Wherein the radiation-proof cement is barium cement; the admixture is prepared by grinding the borosillimanite and spodumene according to the proportion of 1: 1, and the specific surface area of the admixture is 463m2A mixture of/kg; the rheological agent is a mixture of sodium stearate and potassium stearate with the mass ratio of 2: 5; the stabilizer is a mixture of methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether in a mass ratio of 1: 3: 4.
The radiation-proof self-compacting concrete provided in the first to fifth embodiments is subjected to workability and mechanical strength tests, and the specific performance test method refers to the standards JGJ/T283-; the radiation-proof performance tests respectively adopt137A Cs source (4 MeV of irradiation energy) and252the Cf neutron source (irradiation energy 14.5MeV) performs an irradiation experiment on the concrete test block, and the linear attenuation coefficient is measured. The performance test results of the radiation-proof self-compacting concrete are shown in Table 6.
Table 6 examples one to five provide results of performance testing of radiation protective self-compacting concrete
The above results show that: the radiation-proof self-compacting concrete obtained in the first to fifth embodiments meets the working requirement of heavy self-compacting concrete, has good segregation resistance and steel bar gap trafficability, has good radiation-proof performance and high mechanical strength, and is suitable for being popularized and applied in the field of buildings with radiation protection requirements.
In summary, the following steps:
the invention can realize high fluidity, segregation resistance and self-compaction of concrete, and the concrete is similar to a continuum by optimizing the grain composition of a concrete system and has certain fluidity under the condition of dry materials without adding water; the radiation-proof cement (one of barium cement and strontium cement) is used as a cementing material, the iron tailing sand is used as fine aggregate, and the barite crushed stone with smaller particles reduces the density difference between powder and aggregate and reduces the sedimentation of the aggregate in slurry; through the high dispersion and surface modification effects of the high-efficiency water reducing agent and the rheological agent, the fluidity of the radiation-proof concrete is greatly improved, the vibration is not needed, and the template can be filled in through a steel bar gap under the action of the self weight; under the action of the stabilizer, the consistency and viscosity of the concrete mixture are regulated and controlled according to actual requirements, high fluidity is guaranteed, meanwhile, the concrete mixture has high water retention and segregation resistance, and even if high-density aggregate exists in concrete, the homogeneity of a concrete system can be guaranteed. The radiation-proof self-compacting concrete dry material provided by the invention has the characteristics of continuous fluid, and the lubricating effect of the rheological agent and the water-retaining thickening and viscosity-adjusting effect of the stabilizing agent ensure that the concrete has excellent workability, is not layered or segregated under the condition of keeping large fluidity, has good steel bar clearance trafficability, ensures that the self-compacting concrete with high apparent density is filled in a template with a complex shape under the vibration effect of no external force, has good filling degree, and realizes self-leveling self-compacting.
The invention can ensure the radiation protection performance and the mechanical strength of concrete, namely, the radiation protection performance and the mechanical strength of concrete can effectively shield the radiation effect of various rays by using the gelled material (one of radiation-proof cement, barium cement and strontium cement) containing heavy metals and the coarse aggregate (admixture, mixture of boron-containing ore and lithium-containing ore), and by doping the boron-containing mineral admixture, boron element in the concrete can absorb a large amount of slow neutrons, is an element with good absorption and shielding effects on neutrons, is an important neutron ray absorbent, and further realizes the effective shielding of neutron rays; a large amount of amorphous active lithium salt, silicon dioxide and aluminum oxide are provided by the high-doping amount of mineral admixture, and are subjected to secondary hydration reaction with cement hydration products, so that the strength and durability of concrete are improved; the iron tailing sand is used as fine aggregate, and the heavy fine aggregate also has the function of ray shielding. Namely, the radiation-proof self-compacting concrete provided by the invention contains shielding elements such as barium, strontium, iron, lithium, boron and the like with good radiation protection function, can effectively shield various rays generated in the application process of nuclear technology, can effectively moderate neutrons, realizes multi-element shielding, reduces radiation hazards, and has excellent radiation protection performance.
The invention uses industrial solid waste to replace partial aggregate, is environment-friendly and low in cost, and uses iron tailing sand as fine aggregate, thereby consuming industrial solid waste and saving natural mineral resources.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a radiation protection self-compaction concrete which characterized in that: the radiation-proof cement comprises radiation-proof cement, an admixture, iron tailing sand, barite crushed stone, a high-efficiency water reducing agent, a rheological agent, a stabilizer and water, wherein the radiation-proof cement is one of barium cement and strontium cement, the admixture is a mixture of boron-containing ore and lithium-containing ore, and the proportion of each component is 440-480 kg/m of the radiation-proof cement3220-260 kg/m of admixture31020-1060 kg/m iron tailing sand32250-2290 kg/m of barite crushed stone310-14 kg/m of high-efficiency water reducing agent34-8 kg/m of rheological agent31 to 4kg/m stabilizer3The water-cement ratio is controlled within the range of 0.36-0.40.
2. The radiation protective self-compacting concrete of claim 1, wherein: the admixture is obtained by grinding boron-containing ore and lithium-containing ore according to the proportion of 1: 1, and the specific surface area is not less than 450m2A mixture of/kg.
3. The radiation protective self-compacting concrete of claim 1, wherein: the boron-containing ore is one of boromagnesite, borosillimanite and tourmaline; the lithium-containing ore is one of spodumene, lepidolite and phospholithionite.
4. The radiation protective self-compacting concrete of claim 1, wherein: the fineness modulus of the iron tailing sand is 2.6, and the powder content is not more than 3%.
5. The radiation protective self-compacting concrete of claim 1, wherein: the barium sulfate content of the barite crushed stone is not lower than 80%, and the grain size of the barite crushed stone is 5-10 mm.
6. The radiation protective self-compacting concrete of claim 1, wherein: the high-efficiency water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
7. The radiation protective self-compacting concrete of claim 1, wherein: the rheological agent is one or a mixture of more than two of potassium stearate and sodium stearate in any proportion.
8. The radiation protective self-compacting concrete of claim 1, wherein: the stabilizer is one or a mixture of more than two of methyl cellulose ether, hydroxyethyl methyl cellulose ether and hydroxypropyl methyl cellulose ether in any proportion.
9. The method for preparing a radiation-proof self-compacting concrete according to any one of claims 1 to 8, characterized in that: firstly, sequentially adding barite crushed stone, iron tailing sand, radiation-proof cement and admixture into a stirrer according to the proportion, and performing dry stirring for 1-2 min to uniformly mix; then sequentially adding a rheological agent and a stabilizing agent according to the proportion, dry-mixing for 2-3 min, and fully mixing; and finally, adding a high-efficiency water reducing agent and water according to the proportion, and mixing for 3-4 min to finish the preparation.
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