Compositions of low-activation concretes and use thereof

A concrete, low-activation technology, applied in the fields of reactors, nuclear engineering, shielding, etc., can solve the problems of high related costs, reduce the radioactivity induced by concrete shielding, and achieve the effect of reducing radioactivity and reducing costs.

Inactive Publication Date: 2018-01-16
ION BEAM APPL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] However, although compositions of low activation concrete known in the art aim to reduce induced radioactivity in concrete shielding, the main disadvantage is that they still generate relatively high amounts of LLW
Therefore, the costs associated with the corresponding waste disposal are still relatively high

Method used

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  • Compositions of low-activation concretes and use thereof
  • Compositions of low-activation concretes and use thereof
  • Compositions of low-activation concretes and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Example 1: Neutron Activation Analysis of Basic Concrete Components

[0088] Different samples of aggregate, sand and cement from different suppliers, ie from Lhoist, Sibelco, CBR, Holcim and Kerneos, were subjected to neutron activation analysis (NAA) using the BR1 nuclear reactor of SCK-CEN from Belgium.

[0089] Eu, Co and Cs concentrations in the basic concrete components were measured using a high-purity germanium spectrometer after two months of irradiation. The results are presented in Table 1.

[0090]

[0091]

[0092] Table 1: NAA measurements of Eu, Co and Cs concentrations in basic concrete components.

[0093] All irradiated limestone aggregates from Table 1 (indeed all high purity limestones) exhibit very low Eu, Co and Cs contents, almost all below 0.1 ppm or even lower. This indicates that high-purity limestone rock is an ideal aggregate for LAC.

[0094] White cement from CBR also contained low levels of impurities with an average Eu concentr...

Embodiment 2

[0096] Example 2: Composition of low activation concrete

[0097] Based on the results from Table 1, the concrete compositions were formulated to minimize Eu, Co and Cs concentrations while maintaining the same physical properties as standard shielded concrete.

[0098] The first type of concrete LAC EI was made from 1914kg of high purity limestone aggregate combined with 260kg of white cement from CBR. Thus, the LAC El type sample contained (approximately) 88% by weight of high purity limestone aggregate. Two infused EI type LAC samples were prepared using two different types of white cement, namely white cement CEM I 42.5N or white cement CEM II / A-LL 42.5N.

[0099] The second type of concrete LAC S1 was made from 1815kg of high purity limestone aggregate combined with 400kg of Secar 71 aluminate cement from Kerneos. Thus, the LAC S1 type sample contained (approximately) 82% by weight of high purity limestone aggregate. A perfused S1 LAC sample was prepared.

[0100] T...

Embodiment 3

[0120] Example 3: Properties of Low Activation Concrete

[0121] physical properties

[0122] Different low-activation concrete samples were prepared and their physical properties were measured according to NBN standards (from the Belgian "Normalization Bureau" (NBN)).

[0123] The concrete formulations of the samples are given in Table 3.

[0124]

[0125] Table 3: Concrete formulations.

[0126] Reference sample 1 is a standard concrete sample based on Rhine sand, ordinary crushed limestone and lime cement.

[0127] The concentrations of Eu, Co and Cs in the concrete components of samples Nos. 2 to 4 are given in Table 1 of Example 1.

[0128] For formulations Nos. 1 to 3, based on gray cement (CEM III / A) or white cement (CEM I 42.5N, or CEM II / A-LL 42.5N), according to standards corresponding to environmental class EI, i.e. for reinforced concrete NBN EN 206 and NBN B15-001 requirements to determine cement and water dosage:

[0129] - per m 3 Concrete has a min...

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Abstract

The present invention relates to compositions of low-activation concretes and use thereof. Specifically, the invention relates to a low-activation concrete comprising high-purity limestone aggregate and white cement, or high-purity limestone aggregate and aluminous cement. The low-activation concrete reduces the content of Europium, Cobalt and Cesium, as well as the content of elements such as Aluminium, Sodium, and Magnesium, when compared to standard concrete compositions and compositions for low-activation concrete already known in the art. The use of the low-activation concrete for formingan interior wall of a particle accelerator vault is provided as well.

Description

technical field [0001] The present invention relates to concrete compositions, more particularly to so-called low activation concrete compositions. [0002] The invention also relates to the use of low activation concrete in radiation protection structures, preferably in particle accelerators. Background technique [0003] Concrete for radiation protection structures basically consists of three components: cement, solid aggregate and water. Additionally, superplasticizers are a common (fourth) component of concrete today. [0004] Europium (Eu), cobalt (Co), and cesium (Cs) are naturally occurring elements in aggregates and cements used in standard concrete, and in concentrations ranging from 1 ppm to tens of ppm (Suzuki, A et al., Journal of Nuclear Science and Technology 38(7)(2001), pp. 542-550). [0005] For example, the concrete in the biological shielding of nuclear power plants is subjected to per second per cm 2 over about 3×10 4 The secondary thermal neutron fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/06
CPCC04B28/02C04B28/06G21F1/04C04B2111/00215C04B2111/00612C04B2111/00862C04B2111/802C04B2111/00258C04B14/28C04B7/02C04B7/32
Inventor F·斯蒂切博特J·皮拉德L·库柏斯
Owner ION BEAM APPL
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