CN108424017B - Radiation-proof concrete active aggregate and preparation method thereof - Google Patents
Radiation-proof concrete active aggregate and preparation method thereof Download PDFInfo
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- CN108424017B CN108424017B CN201810286243.4A CN201810286243A CN108424017B CN 108424017 B CN108424017 B CN 108424017B CN 201810286243 A CN201810286243 A CN 201810286243A CN 108424017 B CN108424017 B CN 108424017B
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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
- 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
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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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
- 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
-
- 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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
-
- 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
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- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a radiation-proof concrete active aggregate and a preparation method thereof. The radiation-proof concrete active aggregate is characterized by comprising the following raw materials in parts by weight: 10-20 parts of water, 60-85 parts of cement, 10-20 parts of barium hydrogen phosphate, 100 parts of lead powder and 130 parts of water reducing agent; also provides a preparation method thereof; simultaneously, the raw materials of the radiation-proof concrete prepared by the active aggregate are provided: 10-20 parts of water, 30-50 parts of cement, 20-45 parts of active fine aggregate, 65-90 parts of active coarse aggregate, 0.1-1 part of water reducing agent and 2-5 parts of fiber; the active aggregate of the invention has easily obtained raw materials, and can improve the structural density, strength and radiation resistance of concrete.
Description
Technical Field
The invention relates to concrete, in particular to radiation-proof concrete active aggregate and a preparation method thereof.
Background
The radiation-proof concrete is also called radiation-proof concrete, shielding concrete and atomic energy protection concrete, and can effectively shield gamma rays and neutron rays generated by atomic nuclear reaction. The principle followed to improve the radiation shielding of concrete is generally to incorporate materials with high apparent density and high atomic number, such as lead powder. But lead powder has no gelling activity, poor compatibility with cement, low content in concrete and poor radiation protection effect. And the stacking density of the lead powder is far higher than that of the common stone aggregate, so that concrete is easy to separate, the construction performance is poor, the cracking is easy to occur, and the curing safety effect of the nuclear waste is seriously influenced.
Disclosure of Invention
Aiming at the problems of the radiation-proof concrete, the invention provides a radiation-proof concrete active aggregate and a preparation method thereof. The active aggregate of the invention has easily obtained raw materials, and can improve the structural density, strength and radiation resistance of concrete.
The radiation-proof concrete active aggregate comprises the following raw materials in parts by weight: 10-20 parts of water, 60-85 parts of cement, 10-20 parts of barium hydrogen phosphate, 100 parts of lead powder and 130 parts of water reducing agent and 0.1-0.5 part of water reducing agent.
The preparation method of the active aggregate comprises the following steps:
(1) mixing 10-20 parts of water and 55-75 parts of cement, uniformly stirring, adding 100-130 parts of lead powder, uniformly stirring again, adding 0.1-0.5 part of water reducing agent and 1-3 parts of fiber, and mixing and stirring for 5-10 min;
(2) processing the mixture obtained in the step (1) into granules, and maintaining for 30-70min at the conditions of 3-6MPa and 40-60 ℃ for one time to obtain an aggregate inner core;
(3) soaking the autoclaved aggregate inner core in water, draining, wrapping 5-15 parts of cement on the surface layer, and performing secondary curing at the temperature of 20-30 ℃ and the relative humidity of 70-90% for 10-30min to obtain active aggregate;
(4) separating by a sieve, wherein the active fine aggregate is the particle size of less than or equal to 4.75mm, and the active coarse aggregate is the particle size of more than 4.75 mm.
The radiation-proof concrete prepared from the aggregate comprises the following raw materials in parts by weight: 10-20 parts of water, 30-50 parts of cement, 20-45 parts of active fine aggregate, 65-90 parts of active coarse aggregate, 0.1-1 part of water reducing agent and 2-5 parts of fiber; the cement is high-iron phosphoaluminate cement, and the main mineral composition is as follows: CaO 30-45%, Al2O325-31%、P2O510-16%、Fe2O38-14%、SiO22 to 5 percent; the fiber is lead boron polyethylene fiber.
The invention has the beneficial effects that:
(1) according to the invention, a large amount of lead powder is bonded together to form the active aggregate inner core through hydration of the high-iron phosphoaluminate cement. The lead powder in the inner core is high in content and uniform in distribution, and the radiation resistance of the inner core can be effectively improved.
(2) The surface layer of the active aggregate is wrapped with cement which is not completely hydrated, and the active aggregate can be subjected to hydration reaction with the cement in the concrete stirring process, so that an interface transition area is thinned and even eliminated, and the performances of the concrete, such as structural compactness, strength and radiation resistance, are improved.
(3) Barium hydrogen phosphate in the concrete reacts with hydration products of the high-iron phosphoaluminate cement to generate barium calcium aluminate and barium calcium phosphoaluminate, the density is high, a large amount of crystal water is contained, and gamma rays and neutrons can be effectively shielded.
(4) The raw materials are easy to obtain, the method is simple, and the implementation is convenient.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
The radiation-proof concrete active aggregate comprises the following raw materials in parts by weight:
(1) mixing 10 parts of water and 55 parts of cement, uniformly stirring, adding 100 parts of lead powder, uniformly stirring again, adding 0.1 part of water reducing agent and 1 part of fiber, and mixing and stirring for 5 min;
(2) processing the mixture obtained in the step (1) into granules, and curing for 30min at 3MPa and 40 ℃ for one time to obtain an aggregate inner core;
(3) soaking the autoclaved aggregate inner core in water, draining, wrapping 5 parts of cement on the surface layer, and performing secondary curing at the temperature of 20 ℃ and the relative humidity of 70% for 30min to obtain active aggregate;
(4) separating by a sieve, wherein the active fine aggregate is the particle size of less than 4.75mm, and the active coarse aggregate is the particle size of more than 4.75 mm.
The radiation-proof concrete prepared from the aggregate comprises the following raw materials in parts by weight: 10 parts of water, 30 parts of cement, 45 parts of active fine aggregate, 90 parts of active coarse aggregate, 0.1 part of water reducing agent and 5 parts of fiber.
Example 2
The radiation-proof concrete active aggregate comprises the following raw materials in parts by weight:
(1) mixing 20 parts of water and 75 parts of cement, uniformly stirring, adding 130 parts of lead powder, uniformly stirring again, adding 0.5 part of water reducing agent and 3 parts of fiber, and mixing and stirring for 10 min;
(2) processing the mixture obtained in the step (1) into granules, and maintaining for 70min at 6MPa and 60 ℃ for one time to obtain an aggregate inner core;
(3) soaking the autoclaved aggregate inner core in water, draining, wrapping 15 parts of cement on the surface layer, and performing secondary curing at the temperature of 30 ℃ and the relative humidity of 90% for 10min to obtain active aggregate;
(4) separating by a sieve, wherein the active fine aggregate is the particle size of less than 4.75mm, and the active coarse aggregate is the particle size of more than 4.75 mm.
The radiation-proof concrete prepared from the aggregate comprises the following raw materials in parts by weight: 20 parts of water, 50 parts of cement, 20 parts of active fine aggregate, 65 parts of active coarse aggregate, 1 part of water reducing agent and 2 parts of fiber.
Example 3
The radiation-proof concrete active aggregate comprises the following raw materials in parts by weight:
(1) mixing and stirring 15 parts of water and 65 parts of cement uniformly, then adding 120 parts of lead powder, stirring uniformly again, then adding 0.35 part of water reducing agent and 2.2 parts of fiber, and mixing and stirring for 8 min;
(2) processing the mixture obtained in the step (1) into granules, and curing for 60min at 5MPa and 50 ℃ for one time to obtain an aggregate inner core;
(3) soaking the autoclaved aggregate inner core in water, draining, wrapping 12 parts of cement on the surface layer, and performing secondary curing at the temperature of 25 ℃ and the relative humidity of 80% for 20min to obtain active aggregate;
(4) separating by a sieve, wherein the active fine aggregate is the particle size of less than 4.75mm, and the active coarse aggregate is the particle size of more than 4.75 mm.
The radiation-proof concrete prepared from the aggregate comprises the following raw materials in parts by weight: 15 parts of water, 40 parts of cement, 35 parts of active fine aggregate, 80 parts of active coarse aggregate, 0.5 part of water reducing agent and 4 parts of fiber.
Comparative example
The radiation-proof concrete comprises the following raw materials in parts by weight: 15 parts of water, 75 parts of portland cement, 35 parts of natural sand aggregate, 80 parts of natural stone aggregate, 0.5 part of water reducing agent and 4 parts of fiber.
The concrete is prepared from the raw materials in the examples and the comparative examples according to GB/T34008-2017 radiation-proof concrete, the radiation-proof performance is measured according to the national standard GB18871-2002 basic standard for ionizing radiation protection and radiation source safety, and the working performance is measured according to the national standard GB/T50081-2002 standard for testing the mechanical properties of common concrete, which are shown in tables 1 and 2 respectively.
TABLE 1 linear attenuation system for radiation-proof concreteNumber (cm)-1）
Table 2 shows the measurement of working Properties of concrete
As can be seen from Table 1, the linear attenuation coefficient of the concrete of the example is obviously higher than that of the comparative example under the irradiation of the gamma rays with different intensities, and the shielding effect of the example is obviously better than that of the comparative example. As can be seen from Table 2, the working performance of the concrete prepared by the invention is slightly superior to that of the conventional radiation-proof concrete.
Claims (2)
1. The preparation method of the radiation-proof concrete active aggregate is characterized by comprising the following steps:
(1) mixing 10-20 parts of water and 55-75 parts of cement, uniformly stirring, adding 100-130 parts of lead powder, uniformly stirring again, adding 0.1-0.5 part of water reducing agent and 1-3 parts of fiber, and mixing and stirring for 5-10 min;
(2) processing the mixture obtained in the step (1) into granules, and maintaining for 30-70min at the conditions of 3-6MPa and 40-60 ℃ for one time to obtain an aggregate inner core;
(3) soaking the autoclaved aggregate inner core in water, draining, wrapping 5-15 parts of cement on the surface layer, and performing secondary curing at the temperature of 20-30 ℃ and the relative humidity of 70-90% for 10-30min to obtain active aggregate;
(4) separating by a sieve, wherein the active fine aggregate is the particle size of less than or equal to 4.75mm, and the active coarse aggregate is the particle size of more than 4.75 mm.
2. The radiation-proof concrete containing the reactive aggregate prepared by the method of claim 1 is characterized by comprising the following raw materials in parts by weight: 10-20 parts of water, 30-50 parts of cement, 20-45 parts of active fine aggregate, 65-90 parts of active coarse aggregate, 0.1-1 part of water reducing agent and 2-5 parts of fiber; the cement is high-iron aluminum phosphateThe main mineral compositions of the acid salt cement are as follows: CaO 30-45%, Al2O325-31%、P2O510-16%、Fe2O38-14%、SiO22 to 5 percent; the fiber is lead boron polyethylene fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810286243.4A CN108424017B (en) | 2018-04-03 | 2018-04-03 | Radiation-proof concrete active aggregate and preparation method thereof |
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| CN201810286243.4A CN108424017B (en) | 2018-04-03 | 2018-04-03 | Radiation-proof concrete active aggregate and preparation method thereof |
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| Publication Number | Publication Date |
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| CN108424017A CN108424017A (en) | 2018-08-21 |
| CN108424017B true CN108424017B (en) | 2020-09-29 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108484088B (en) * | 2018-04-03 | 2020-12-25 | 济南大学 | Ettringite radiation-proof concrete |
| CN112557335B (en) * | 2020-11-30 | 2024-02-02 | 四川中核艾瑞特工程检测有限公司 | Method for detecting effective shielding element of anti-radiation concrete |
| CN113978060B (en) * | 2021-12-23 | 2022-03-15 | 艮玖(北京)门业有限公司 | Automatic translation radiation-proof door |
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Patent Citations (10)
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| JPS60103058A (en) * | 1983-11-08 | 1985-06-07 | 秩父セメント株式会社 | Heavy concrete composition |
| CN101805156A (en) * | 2010-04-07 | 2010-08-18 | 中冶宝钢技术服务有限公司 | Steel slag radiation shield concrete and preparation method thereof |
| CN101863641A (en) * | 2010-05-07 | 2010-10-20 | 武汉理工大学 | Radiation-resistant concrete based on environment protection type functional aggregates and preparation method thereof |
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