CN111170683A - Radiation-proof concrete and production process thereof - Google Patents
Radiation-proof concrete and production process thereof Download PDFInfo
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- CN111170683A CN111170683A CN201911088283.9A CN201911088283A CN111170683A CN 111170683 A CN111170683 A CN 111170683A CN 201911088283 A CN201911088283 A CN 201911088283A CN 111170683 A CN111170683 A CN 111170683A
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- 239000004567 concrete Substances 0.000 title claims abstract description 127
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000000835 fiber Substances 0.000 claims abstract description 82
- 239000004576 sand Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000012986 modification Methods 0.000 claims abstract description 37
- 230000004048 modification Effects 0.000 claims abstract description 37
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 35
- 229910052601 baryte Inorganic materials 0.000 claims abstract description 35
- 239000010428 baryte Substances 0.000 claims abstract description 35
- 229910021538 borax Inorganic materials 0.000 claims abstract description 31
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 31
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 24
- -1 polypropylene Polymers 0.000 claims abstract description 21
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 20
- 239000004743 Polypropylene Substances 0.000 claims abstract description 20
- 239000004917 carbon fiber Substances 0.000 claims abstract description 20
- 229920001155 polypropylene Polymers 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 19
- 238000002360 preparation method Methods 0.000 claims abstract description 18
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 16
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims abstract description 14
- 229910021646 siderite Inorganic materials 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 10
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 10
- 239000011347 resin Substances 0.000 claims abstract description 10
- 229920005989 resin Polymers 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 10
- 239000010703 silicon Substances 0.000 claims abstract description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000005855 radiation Effects 0.000 claims description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims 6
- 238000005336 cracking Methods 0.000 abstract description 15
- 230000003471 anti-radiation Effects 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 13
- 238000007711 solidification Methods 0.000 description 12
- 230000008023 solidification Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005865 ionizing radiation Effects 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
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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
-
- 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
- C04B14/386—Carbon
-
- 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
-
- 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
- C04B18/027—Lightweight 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
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B20/1085—Waterglass
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses radiation-proof concrete which is prepared by mixing the following components in parts by weight: 325-375 parts of cement, 490-545 parts of modified ceramsite sand, 465-505 parts of barite, 715-780 parts of barite sand, 6-12 parts of siderite, 150-195 parts of water, 5-10 parts of a water reducing agent, 90-145 parts of fly ash, 15-22 parts of borax and 28-36 parts of modified composite fiber; the preparation of the barite comprises the following steps: mixing 65-75 parts by weight of water glass with the mass concentration of 5%, 12-18 parts by weight of organic silicon resin and 4-8 parts by weight of borax to obtain an aggregate modification liquid, immersing ceramsite sand into the aggregate modification liquid for 30-40min, taking out and draining to obtain the ceramsite sand; the preparation of the modified combined fiber comprises the following steps: mixing 15-27 parts by weight of polyvinyl alcohol and 35-50 parts by weight of water, heating to melt, adding 2.4-3.2 parts by weight of polyethylene glycol, stirring to obtain a fiber modification solution, uniformly mixing polypropylene fibers and carbon fibers in a weight ratio of 4-5:1, immersing the mixture into the fiber modification solution for 1-2 hours, taking out and draining to obtain modified combined fibers; the concrete disclosed by the invention has excellent anti-cracking performance on the premise of higher anti-radiation performance.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to radiation-proof concrete and a production process thereof.
Background
the radiation-proof concrete is concrete capable of shielding various rays such as α, beta, gamma, neutron rays and the like, can reduce the damage of the various rays in the environment to human bodies, is usually used as a main body for radiation protection of buildings, and is used for buildings with radiation sources such as education, scientific research and medical institutions and the like and the protection of inner and outer shells of nuclear reactors.
among the above-mentioned radiation rays, α and β rays have low penetrating power and are easily absorbed, so that when designing radiation-proof concrete, shielding of two rays having strong penetrating power, γ and neutron rays, is mainly considered.
At present, the radiation protection capability of high concrete is improved by adding aggregate containing heavy metal elements, however, although the radiation protection capability of the concrete can be effectively improved by the radiation protection aggregate containing heavy metal elements, the density of the aggregate and the volume weight of the concrete are increased, and meanwhile, the combination property of the radiation protection aggregate and a concrete matrix is poor, so that the concrete is easy to crack.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the following steps: the radiation-proof concrete has excellent anti-cracking performance on the premise of higher radiation-proof performance.
The first purpose of the invention is realized by the following technical scheme:
the radiation-proof concrete comprises the following components in parts by weight: 325-375 parts of cement, 490-545 parts of modified ceramsite sand, 465-505 parts of barite, 715-780 parts of barite sand, 6-12 parts of siderite, 150-195 parts of water, 5-10 parts of a water reducing agent, 90-145 parts of fly ash, 15-22 parts of borax and 28-36 parts of modified composite fiber;
the preparation method of the barite comprises the following steps: uniformly mixing 65-75 parts of water glass with the mass concentration of 5%, 12-18 parts of organic silicon resin and 4-8 parts of borax according to parts by weight to obtain an aggregate modification liquid; soaking the ceramsite sand in the aggregate modification liquid for 30-40min, taking out and draining to obtain barite;
the preparation method of the modified combined fiber comprises the following steps: mixing 15-27 parts of polyvinyl alcohol and 35-50 parts of water according to parts by weight, heating to melt, adding 2.4-3.2 parts of polyethylene glycol, and uniformly stirring to obtain a fiber modified solution; uniformly mixing polypropylene fibers and carbon fibers in a weight ratio of 4-5:1, soaking the mixture in a fiber modification solution for 1-2h, taking out the mixture, and draining to obtain the modified combined fiber.
By adopting the scheme, firstly, the barite sand and the siderite in proper proportion are selected as the raw materials of the concrete, so that the concrete has a good shielding effect on rays, and the concrete has good radiation resistance. The invention replaces the traditional broken stone with the lightweight ceramsite sand, reduces the density of the aggregate, is beneficial to reducing the volume weight of the concrete and reduces the possibility of cracking of the concrete.
According to the invention, aggregate modification liquid is adopted to modify the ceramsite sand, so that the pores of the ceramsite sand are sealed, the porosity of the ceramsite sand is reduced, and the modified ceramsite sand is obtained, so that the water absorption of the ceramsite sand in concrete is reduced, the influence of the ceramsite sand on the cohesiveness of the concrete is reduced, and the compressive strength of the concrete is improved.
In addition, the modified combined fibers are added into the concrete, and can play a role in connecting a concrete matrix by utilizing the fibrous property of the modified combined fibers, so that the anti-cracking performance of the concrete is effectively improved.
In the preparation of the modified composite fiber, two fibers, namely polypropylene fiber and carbon fiber, are selected, the modulus of the polypropylene fiber is lower, and the modulus of the carbon fiber is higher.
According to the invention, the fiber modification liquid is used for carrying out surface treatment on the two fibers, polyvinyl alcohol is adhered to the surfaces of the two fibers, borax is adhered to the surfaces of ceramsite sand in the modification process, the concrete matrix also contains borax, and the polyvinyl alcohol on the surfaces of the two fibers can form a gel network structure with the borax on the surfaces of the modified ceramsite sand and in the concrete matrix, so that the bonding performance between the two fibers, the modified ceramsite sand and the concrete matrix is greatly improved, and the anti-cracking performance of concrete is effectively improved.
In the solidification process of concrete, the cement inside the concrete generates hydration, so that a large amount of hydration heat is released inside the concrete, and the concrete is easy to crack due to the fact that the temperature difference between the inside of the concrete and the external environment is large. The concrete has reasonable raw material proportion, can greatly reduce hydration in the concrete solidification process, reduce the internal and external temperature difference in the concrete solidification process, and is favorable for reducing the cracking phenomenon of the concrete solidification.
The invention is further configured to: the paint comprises the following components in parts by weight: 275 parts of cement, 664 parts of modified ceramsite sand, 478 parts of barite, 766 parts of barite sand, 8 parts of siderite, 168 parts of water, 6 parts of water reducing agent, 105 parts of fly ash, 22 parts of borax and 32 parts of modified composite fiber.
The invention is further configured to: according to the weight parts, 70 parts of water glass with the mass concentration of 5%, 15 parts of organic silicon resin and 6 parts of borax are uniformly mixed to obtain the aggregate modification liquid.
The invention is further configured to: mixing 20 parts of polyvinyl alcohol and 42 parts of water according to parts by weight, heating to melt, adding 2.7 parts of polyethylene glycol, and uniformly stirring to obtain the fiber modified solution.
The invention is further configured to: the weight part ratio of the polypropylene fiber to the carbon fiber is 4.3: 1.
The invention is further configured to: the particle size of the modified ceramsite sand is 10-15mm, and the bulk density is 300-500kg/m 3.
The invention is further configured to: the fineness modulus of the recrystallized sand is 2-2.5.
The invention is further configured to: the water reducing agent is a polycarboxylic acid water reducing agent.
The second purpose of the invention is that: the production process of the radiation-proof concrete comprises the following preparation steps: and (3) uniformly stirring cement, modified ceramsite sand, barite sand, siderite and water at the temperature of 20-30 ℃, adding a water reducing agent, fly ash, borax and modified composite fibers, and continuously stirring for 10-20min to obtain the radiation-proof concrete.
In conclusion, the invention has the following beneficial effects:
1. the barite, the barite sand and the siderite in proper proportion are selected as the raw materials of the concrete, so that the shielding effect on rays is good;
2. the invention replaces the traditional broken stone with the ceramsite sand, which is beneficial to reducing the volume weight of the concrete and reducing the possibility of cracking of the concrete;
3. according to the invention, the aggregate modification liquid is adopted to seal the pores of the ceramsite sand, so that the water absorption of the ceramsite sand in concrete is reduced, and the influence of the aggregate modification liquid on the cohesiveness of the concrete is reduced, thereby improving the compressive strength of the concrete and reducing the cracking phenomenon of the concrete during solidification;
4. after the polypropylene fiber and the carbon fiber are modified, the polarity of the surface agent of the two fibers can be changed, and the bonding performance between the two fibers and a concrete matrix is improved, so that the cracking resistance of concrete is improved;
5. after the two fibers, namely the polypropylene fiber and the carbon fiber, are modified, polyvinyl alcohol is adhered to the surfaces of the two fibers, borax is adhered to the surfaces of the ceramsite sand in the modification process, a concrete matrix also contains borax, and the polyvinyl alcohol on the surfaces of the two fibers can form a gel network structure with the borax on the surfaces of the modified ceramsite sand and in the concrete matrix, so that the bonding performance between the two fibers and the barite and the concrete matrix is greatly improved, and the anti-cracking performance of the concrete is effectively improved;
6. the concrete has reasonable raw material proportion, can greatly reduce hydration in the concrete solidification process, reduce the internal and external temperature difference in the concrete solidification process, and is favorable for reducing the cracking phenomenon of the concrete solidification.
Detailed Description
The present invention will be described in further detail below.
The modified ceramsite sand used in the following examples had a particle size of 10-15mm and a bulk density of 300-500kg/m3The water absorption rate is 3.0 percent, the crushing value is 12 percent, the cement is P.O42.5 cement, the diameters of the polypropylene fiber and the carbon fiber are both 20 mu m, and the lengths are both 2.5 mm.
Example 1
The production process of the radiation-proof concrete comprises the following preparation steps:
uniformly stirring 325 parts of cement, 490 parts of modified ceramsite sand, 465 parts of barite, 715 parts of barite sand, 6 parts of siderite and 150 parts of water at 20 ℃, adding 5 parts of water reducing agent, 90 parts of fly ash, 15 parts of borax and 28 parts of modified composite fiber, and continuously stirring for 10min to obtain the radiation-proof concrete;
the preparation method of the barite comprises the following steps: uniformly mixing 65 parts of water glass with the mass concentration of 5%, 12 parts of organic silicon resin and 4 parts of borax according to parts by weight to obtain an aggregate modification liquid; soaking the ceramsite sand in the aggregate modification liquid for 30min, taking out and draining to obtain barite;
the preparation method of the modified combined fiber comprises the following steps: mixing 15 parts of polyvinyl alcohol and 35 parts of water according to parts by weight, heating to melt, adding 2.4 parts of polyethylene glycol, and uniformly stirring to obtain a fiber modification solution; uniformly mixing polypropylene fibers and carbon fibers in a weight ratio of 4:1, soaking the mixture in a fiber modification solution for 1 hour, taking out the mixture, and draining to obtain the modified combined fiber.
Example 2
The production process of the radiation-proof concrete comprises the following preparation steps:
at 25 ℃, 355 parts of cement, 525 parts of modified ceramsite sand, 480 parts of barite, 740 parts of barite sand, 8 parts of siderite and 165 parts of water are uniformly stirred, 7 parts of water reducing agent, 115 parts of fly ash, 19 parts of borax and 32 parts of modified composite fiber are added, and stirring is continued for 15min to obtain the radiation-proof concrete;
the preparation method of the barite comprises the following steps: uniformly mixing 70 parts of water glass with the mass concentration of 5%, 15 parts of organic silicon resin and 6 parts of borax according to parts by weight to obtain an aggregate modification liquid; soaking the ceramsite sand in the aggregate modification liquid for 35min, taking out and draining to obtain barite;
the preparation method of the modified combined fiber comprises the following steps: mixing 20 parts of polyvinyl alcohol and 42 parts of water according to parts by weight, heating to melt, adding 2.7 parts of polyethylene glycol, and uniformly stirring to obtain a fiber modification solution; uniformly mixing polypropylene fibers and carbon fibers in a weight ratio of 4.3:1, soaking the mixture in a fiber modification solution for 1.5 hours, taking out the mixture, and draining to obtain the modified combined fiber.
Example 3
The production process of the radiation-proof concrete comprises the following preparation steps:
at 30 ℃, uniformly stirring 375 parts of cement, 545 parts of modified ceramsite sand, 505 parts of barite, 780 parts of barite sand, 12 parts of siderite and 195 parts of water according to parts by weight, adding 10 parts of water reducing agent, 145 parts of fly ash, 22 parts of borax and 36 parts of modified composite fiber, and continuously stirring for 20min to obtain the radiation-proof concrete;
the preparation method of the barite comprises the following steps: uniformly mixing 75 parts of water glass with the mass concentration of 5%, 18 parts of organic silicon resin and 8 parts of borax in parts by weight to obtain an aggregate modification liquid; soaking the ceramsite sand in the aggregate modification liquid for 40min, taking out and draining to obtain barite;
the preparation method of the modified combined fiber comprises the following steps: mixing 27 parts of polyvinyl alcohol and 50 parts of water according to parts by weight, heating to melt, adding 3.2 parts of polyethylene glycol, and uniformly stirring to obtain a fiber modification solution; uniformly mixing polypropylene fibers and carbon fibers in a weight ratio of 5:1, soaking the mixture in a fiber modification solution for 2 hours, taking out the mixture, and draining to obtain the modified combined fiber.
Example 4
The radiation-proof concrete is different from the concrete in the embodiment 2 in that the radiation-proof concrete comprises the following components in parts by weight: 325 parts of cement, 490 parts of modified ceramsite sand, 465 parts of barite, 715 parts of barite sand, 6 parts of siderite, 150 parts of water, 5 parts of water reducing agent, 90 parts of fly ash, 15 parts of borax and 28 parts of modified composite fiber.
Example 5
The radiation-proof concrete is different from the concrete in the embodiment 2 in that the radiation-proof concrete comprises the following components in parts by weight: 375 parts of cement, 545 parts of modified ceramsite sand, 505 parts of barite, 780 parts of barite sand, 12 parts of siderite, 195 parts of water, 10 parts of water reducing agent, 145 parts of fly ash, 22 parts of borax and 36 parts of modified composite fiber.
Example 6
The radiation-proof concrete is different from the concrete in example 2 in that: according to the weight parts, 65 parts of water glass with the mass concentration of 5%, 12 parts of organic silicon resin and 4 parts of borax are uniformly mixed to obtain the aggregate modification liquid.
Example 7
The radiation-proof concrete is different from the concrete in example 2 in that: 75 parts of water glass with the mass concentration of 5%, 18 parts of organic silicon resin and 8 parts of borax are uniformly mixed according to the parts by weight to obtain the aggregate modification liquid.
Example 8
The radiation-proof concrete is different from the concrete in example 2 in that: mixing 15 parts of polyvinyl alcohol and 35 parts of water according to parts by weight, heating to melt, adding 2.4 parts of polyethylene glycol, and uniformly stirring to obtain the fiber modified solution.
Example 9
The radiation-proof concrete is different from the concrete in example 2 in that: mixing 20 parts of polyvinyl alcohol and 42 parts of water according to parts by weight, heating to melt, adding 2.7 parts of polyethylene glycol, and uniformly stirring to obtain the fiber modified solution.
Example 10
The radiation-proof concrete is different from the concrete in example 2 in that: the ratio of polypropylene fiber to carbon fiber is 4:1 by weight.
Example 11
The radiation-proof concrete is different from the concrete in example 2 in that: the ratio of the polypropylene fiber to the carbon fiber is 5:1 by weight.
Comparative example 1
The radiation-proof concrete is different from the concrete in example 2 in that: the ceramsite sand is not modified.
Comparative example 2
The radiation-proof concrete is different from the concrete in example 2 in that: the polypropylene fibers and the carbon fibers were not subjected to modification treatment.
Concrete radiation-proof performance detection
The concrete produced in examples 1-11 and comparative examples 1-2 is subjected to radiation protection performance detection with reference to GB18871-2002 basic standards on ionizing radiation protection and radiation source safety, and the linear attenuation coefficient of the concrete to gamma rays and the total macroscopic capture cross section of the concrete to neutron rays are measured, wherein the gamma rays are measured by a nuclear radiation detector, the seed rays are measured by a neutron source, and the results are shown in Table 1.
TABLE 1 concrete radiation protection Property test results (cm)-1)
As can be seen from Table 1, the concrete produced in examples 1 to 11 and comparative examples 1 to 2 each had good radiation protection properties.
Concrete crack resistance detection
The concrete produced in examples 1-11 and comparative examples 1-2 was tested for crack resistance with reference to GB50081-2002 Standard test methods for mechanical Properties of general concrete, and the results are shown in Table 2.
TABLE 2 concrete mechanical Property test results
According to table 2, it can be seen from comparing examples 2, 4 and 5 that the impact resistance and the splitting strength of example 2 are better, because the raw material ratio of the concrete in example 2 is more reasonable, the hydration effect in the concrete solidification process can be greatly reduced, the internal and external temperature difference in the concrete solidification process is reduced, and the cracking phenomenon of the concrete solidification is favorably reduced.
As can be seen from the example 2 and the comparative example 1, the aggregate modification liquid provided by the invention is used for modifying ceramsite sand, so that the impact resistance of concrete can be effectively improved, and the splitting strength of the concrete is improved. The aggregate modification liquid can effectively seal the pores of the ceramsite sand, so that the water absorption amount of the ceramsite sand in the concrete is reduced, the influence of the ceramsite sand on the cohesiveness of the concrete is reduced, the compressive strength of the concrete is improved, and the cracking phenomenon of the concrete during solidification is reduced. It can be seen from the combination of examples 6 and 7 that the blending ratio of the aggregate modifying liquid in example 2 is the best.
As can be seen from the example 2 and the comparative example 2, the fiber modification liquid provided by the invention is used for modifying polypropylene fibers and carbon fibers, so that the impact resistance of concrete can be effectively improved, and the splitting strength of the concrete is improved. This is because, on the one hand, the fiber modifying solution can change the polarity of the surface agent of the two fibers, improve the binding performance with the concrete matrix, and thus improve the cracking resistance of the concrete; on the other hand, polyvinyl alcohol is adhered to the surfaces of the two modified fibers, borax is adhered to the surfaces of the ceramsite sand in the modification process, the concrete matrix also contains borax, and the polyvinyl alcohol on the surfaces of the two fibers can form a gel network structure with the surfaces of the modified ceramsite sand and the borax in the concrete matrix, so that the bonding performance between the two fibers, the modified ceramsite sand and the concrete matrix is greatly improved, and the anti-cracking performance of concrete is effectively improved. It can be seen from examples 8 to 9 that the ratio of the fiber-modifying solution in example 2 is the best.
It can be seen from examples 2, 10, and 11 that the ratio of the polypropylene fiber and the carbon fiber has a greater influence on the crack resistance of the concrete, because the modulus of the polypropylene fiber is lower and the modulus of the carbon fiber is higher, and the polypropylene fiber and the carbon fiber in reasonable ratio can enable the modified composite fiber to have a suitable modulus, thereby being beneficial to improving the crack resistance of the concrete.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (9)
1. The radiation-proof concrete is characterized by comprising the following components in parts by weight: 325-375 parts of cement, 490-545 parts of modified ceramsite sand, 465-505 parts of barite, 715-780 parts of barite sand, 6-12 parts of siderite, 150-195 parts of water, 5-10 parts of a water reducing agent, 90-145 parts of fly ash, 15-22 parts of borax and 28-36 parts of modified composite fiber;
the preparation method of the modified ceramsite sand comprises the following steps: uniformly mixing 65-75 parts of water glass with the mass concentration of 5%, 12-18 parts of organic silicon resin and 4-8 parts of borax according to parts by weight to obtain an aggregate modification liquid; soaking the ceramsite sand in the aggregate modification liquid for 30-40min, taking out and draining to obtain modified ceramsite sand;
the preparation method of the modified combined fiber comprises the following steps: mixing 15-27 parts of polyvinyl alcohol and 35-50 parts of water according to parts by weight, heating to melt, adding 2.4-3.2 parts of polyethylene glycol, and uniformly stirring to obtain a fiber modified solution; uniformly mixing polypropylene fibers and carbon fibers in a weight ratio of 4-5:1, soaking the mixture in a fiber modification solution for 1-2h, taking out the mixture, and draining to obtain the modified combined fiber.
2. The radiation protective concrete according to claim 1, characterized in that: the paint comprises the following components in parts by weight: 355 parts of cement, 525 parts of modified ceramsite sand, 480 parts of barite, 740 parts of barite sand, 8 parts of siderite, 165 parts of water, 7 parts of a water reducing agent, 115 parts of fly ash, 19 parts of borax and 32 parts of modified composite fiber.
3. The radiation-proof concrete according to claim 1, characterized in that 70 parts of water glass with a mass concentration of 5%, 15 parts of organic silicon resin and 6 parts of borax are uniformly mixed according to parts by weight to obtain an aggregate modification liquid.
4. The radiation protective concrete according to claim 1, characterized in that: mixing 20 parts of polyvinyl alcohol and 42 parts of water according to parts by weight, heating to melt, adding 2.7 parts of polyethylene glycol, and uniformly stirring to obtain the fiber modified solution.
5. The radiation protective concrete according to claim 1, characterized in that: the weight part ratio of the polypropylene fiber to the carbon fiber is 4.3: 1.
6. The radiation protective concrete according to claim 1, characterized in that: the particle size of the modified ceramsite sand is 10-15mm, and the bulk density is 300-500kg/m3。
7. The radiation protective concrete according to claim 1, characterized in that: the fineness modulus of the recrystallized sand is 2-2.5.
8. The radiation protective concrete according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid water reducing agent.
9. The production process of the radiation-proof concrete as claimed in any one of claims 1 to 8, which is characterized by comprising the following preparation steps: and (3) uniformly stirring cement, modified ceramsite sand, barite sand, siderite and water at the temperature of 20-30 ℃, adding a water reducing agent, fly ash, borax and modified composite fibers, and continuously stirring for 10-20min to obtain the radiation-proof concrete.
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