Anti-crack and anti-impact ultra-high performance radiation protection concrete and preparation method thereof

An ultra-high-performance concrete technology, applied in clay products, ceramic products, and other household appliances, can solve the problems of high cementitious material consumption, affecting mechanical properties, and limiting applications, so as to improve impact toughness and radiation shielding performance Good, enhance the effect of radiation protection performance

Active Publication Date: 2022-06-03
ANHUI UNIVERSITY OF ARCHITECTURE +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Although the existing technology uses mineral aggregates containing heavy metals to prepare ultra-high performance concrete, which increases the radiation shielding ability of concrete, there are still two problems in the prepared concrete: (1) the commonly used natural minerals have many densities (barite 4.3 ×10 3 kg / m 3 , iron ore 4.0~5.0×10 3 kg / m 3 ) and low strength, it is difficult to prepare ultra-high-strength anti-radiation concrete. High-density aggregates are also easy to settle and segregate when used in the preparation of concrete, causing poor homogeneity of concrete and affecting its mechanical properties; (2) gelation of ultra-high performance concrete High material usage and excessive shrinkage (up to 8.0×10 -4 )
If shrinkage cracks occur and the rays are transmitted along the cracks, the radiation shielding ability of concrete will be greatly reduced
However, steam curing is used to improve the volume stability and crack resistance of components, which limits its application in cast-in-place concrete buildings, and cannot give full play to the convenience of construction of concrete materials; (3) UHPC only contains Steel fibers cannot inhibit the expansion of micro-cracks, and the impact resistance performance is specifically designed; therefore, improving the crack resistance and impact resistance of concrete and enhancing its homogeneity are the key to the preparation of radiation-resistant ultra-high performance concrete

Method used

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  • Anti-crack and anti-impact ultra-high performance radiation protection concrete and preparation method thereof
  • Anti-crack and anti-impact ultra-high performance radiation protection concrete and preparation method thereof

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preparation example Construction

[0039] Based on the same inventive concept, the present application also provides a method for preparing the above-mentioned crack-resistant and impact-resistant ultra-high-performance radiation-proof concrete, comprising the following steps:

[0040] S1. Combine cement, mineral admixture, nano-TiO 2 , calcium carbonate whiskers, bulking agent and heavy metal sludge regenerated aggregates are added into the concrete mixer and stirred evenly, and then water, water reducing agent and superabsorbent resin are added; Carry out moulding, vibrating and forming to obtain a concrete mixture;

[0041] S2. Cover the surface of the concrete mixture with an impermeable film, and then put it into a curing room for curing to obtain ultra-high performance radiation-proof concrete with crack resistance and impact resistance.

Embodiment 1～3

[0044] The present embodiment provides a method for preparing a heavy metal sludge regeneration aggregate comprising the following steps:

[0045] S1, the heavy metal sludge is mixed with the calibration raw material according to the proportion in Table 1 to obtain a mixture, and the Cr in the mixture is made by matching each component. 2 O 3 The mass content of ZnO is 13%, the mass content of ZnO is 8%, the mass content of alumina is 26%, and the mass content of silicon oxide is 18%;

[0046] S2, mixing the mixture evenly, grinding, and then granulating to obtain particles with a particle size of ≤4.75 mm and a moisture content of 20 to 25%;

[0047] S3, the granules obtained by granulation are roasted according to the roasting system in table 2 in a high-temperature furnace to obtain heavy metal sludge regeneration aggregates.

[0048] Table 1 - Raw Material Composition of Heavy Metal Sludge Recycled Aggregate

[0049]

[0050] Table 2 - Roasting System of Heavy Metal ...

Embodiment 4～9

[0058] The embodiment of the present application provides a crack-resistant and impact-resistant ultra-high-performance radiation-proof concrete, including the raw materials in the proportions in Table 4;

[0059] Among them, the cement used is Huaxin P.O 52.5 ordinary Portland cement;

[0060] The silica fume used is produced by Shanghai Tiankai Silica Fume Material Co., Ltd., in which SiO 2 The mass content is 95%, the specific surface area is 17500m 2 / kg, 28d activity index 105%;

[0061] The fly ash microbeads used are produced by Tianjin Zhucheng New Material Technology Co., Ltd. and have a specific surface area of ​​1300 m. 2 / kg, activity coefficient 105%, water demand ratio 88%, apparent density 2520kg / m 3 ;

[0062] Nano TiO used 2 Produced by Xingtai Xindun Alloy Co., Ltd. with a specific surface area of ​​35m 2 / g;

[0063] The heavy metal sludge regeneration aggregate used is the heavy metal sludge regeneration aggregate prepared in Example 3;

[0064] The...

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Abstract

The invention provides anti-crack and anti-impact ultra-high-performance radiation-proof concrete and a preparation method thereof. The radiation-proof concrete comprises cement, a mineral admixture, nano TiO2, calcium carbonate whiskers, an expanding agent, heavy metal sludge regenerated aggregate, a water reducing agent and super absorbent resin. According to the ultra-high-performance radiation-proof concrete disclosed by the invention, the nano TiO2, the calcium carbonate whiskers and the hybrid fibers are doped to toughen a concrete material from different scales and are disorderly distributed in the concrete, and the nano TiO2, the calcium carbonate whiskers and the hybrid fibers have ultra-high tensile strength, are complementary in size range and can bridge cracks with different scales in the concrete; impact energy is absorbed when the concrete is subjected to an impact load, so that the impact toughness of the anti-radiation ultra-high performance concrete is effectively improved. The filling effect of the micro-nano scale material TiO2 and calcium carbonate whiskers can improve the compactness of the ultra-high performance concrete, and the TiO2 material itself has a strong ray shielding effect, so that the radiation protection performance of the ultra-high performance concrete can be enhanced.

Description

technical field [0001] The invention relates to the field of radiation shielding building materials, in particular to a crack-resistant and impact-resistant ultra-high-performance radiation-proof concrete and a preparation method thereof. Background technique [0002] With the increasing maturity and wide application of nuclear technology, the protection of its associated gamma rays and neutron rays is becoming more and more important. Radiation protection concrete is the most widely used and economical nuclear radiation protection material. Compared with metal and organic polymer protection materials, it has the advantages of wide source of raw materials, easy construction and low manufacturing cost. As a key facility for national security and development, nuclear engineering facilities are damaged and destroyed (may be damaged by high-tech weapons precision strikes, explosions, earthquakes, etc.), which will cause huge national property losses and environmental security da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B24/26C04B22/06C04B18/02C04B14/48C04B14/46C04B14/38C04B33/04C04B33/132C04B33/135C04B38/00C04B38/06C04B111/34
CPCC04B28/04C04B22/06C04B14/383C04B14/48C04B14/4643C04B18/027C04B24/26C04B38/0665C04B38/009C04B33/1357C04B33/04C04B33/132C04B2111/343C04B2111/00258C04B2201/50C04B18/146C04B18/08C04B2103/302C04B2103/0068Y02P40/60Y02W30/91
Inventor 杨军张高展张键廖绍峰许炜吴明明丁庆军
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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