Thermal, epithermal and thermalized neutron attenuation properties of ilmenite-serpentine heat resistant concrete shield

Kany, A.M.I.; El-Gohary, M.I.; Kamal, Salahuddin M.

doi:10.1016/0969-806x(94)90122-8

Cited by 11 publications

(3 citation statements)

References 4 publications

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“…According to the results of differential thermal analysis (DTA) [29,42] of TEOS hydrolyzed in an alkaline medium, the transition of gel cluster to amorphous cluster was found at 260 • C. This result is in agreement with previous studies showing the formation of amorphous silica from organosilicon oligomers [31]. Therefore, the modified chrysotile was heat treated at this temperature to form amorphous silica in the nanotube cavities.…”

Section: Resultssupporting

confidence: 90%

“…The association of isolated tetrahedrons of B(OH) 4 into polyions and the ability of polyions to polymerize at decreasing temperatures leads to the formation of framework boron-containing crystalline hydrate structures [27,28]. It is reasonable to use concrete reinforced with such materials in radiation shielding structures operating at temperatures up to +(300-350) • C without fear of reduction in its protective properties [29].…”

Section: Introductionmentioning

confidence: 99%

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Application of Organosilicon Modifier Based on Tetraethoxysilane for the Production of Heat-Resistant Chrysotile Fibers and Reinforced Cement Composites

Yastrebinsky,

Pavlenko,

Yastrebinskaya

et al. 2023

Fibers

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This research is aimed at obtaining boron-containing nanotubular chrysotile fibers with increased neutron absorption capacity. The possibility of using an organosilicon modifier based on tetraethoxysilane to increase the hydrothermal stability of chrysotile, as well as the strength of nanoreinforced composites based on a cement binder is considered. The mechanisms for the synthesis of heat-resistant nanotubular fibers of the composition Mg6(OH)8SiB4O10, which have a chrysotile structure, have been established. To increase the hydrothermal stability of chrysotile, crystalline hydrate phases were localized inside nanotubes using amorphous silica formed as a result of hydrolysis of silicon alkoxide under hydrothermal conditions in an alkaline environment. The modification of chrysotile via amorphous silica increases its hydrothermal stability by 97 °C. It is shown that the introduction of an organosilicon modifier based on tetraethoxysilane into the composition of Portland cement composite material leads to an increase in the structural strength and density of the composite due to the activation of silicate formation processes in the cement matrix, especially under hydrothermal conditions. The experiments showed that the strength of silicon alkoxide-modified samples of composite material increased by 34%.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Application of Organosilicon Modifier Based on Tetraethoxysilane for the Production of Heat-Resistant Chrysotile Fibers and Reinforced Cement Composites

Yastrebinsky,

Pavlenko,

Yastrebinskaya

et al. 2023

Fibers

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“…Concrete blocks absorb neutrons due to hydrogen content. There are several studies about radiation shield processes using concrete; [3][4][5][6][7]. Also, neutron dose transmission values determined for several new concrete types including colemanite and neutron shielding properties of some boron bearing compounds determined and calculated [8,9].…”

Section: Introductionmentioning

confidence: 99%

New applications and developments in the neutron shielding

Uğur

2017

EPJ Web Conf.

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Abstract. Shielding neutrons involve three steps that are slowing neutrons, absorption of neutrons, and impregnation of gamma rays. Neutrons slow down with thermal energy by hydrogen, water, paraffin, plastic. Hydrogenated materials are also very effective for the absorption of neutrons. Gamma rays are produced by neutron (radiation) retention on the neutron shield, inelastic scattering, and degradation of activation products. If a source emits gamma rays at various energies, high-energy gamma rays sometimes specify shielding requirements. Multipurpose Materials for Neutron Shields; Concrete, especially with barium mixed in, can slow and absorb the neutrons, and shield the gamma rays. Plastic with boron is also a good multipurpose shielding material. In this study; new applications and developments in the area of neutron shielding will be discussed in terms of different materials.

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Shielding concrete with neutron attenuating and absorbing components

Piotrowski

2020

Micro and Nanostructured Composite Materials for Neutron Shielding Applications

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Thermal, epithermal and thermalized neutron attenuation properties of ilmenite-serpentine heat resistant concrete shield

Cited by 11 publications

References 4 publications

Application of Organosilicon Modifier Based on Tetraethoxysilane for the Production of Heat-Resistant Chrysotile Fibers and Reinforced Cement Composites

Application of Organosilicon Modifier Based on Tetraethoxysilane for the Production of Heat-Resistant Chrysotile Fibers and Reinforced Cement Composites

New applications and developments in the neutron shielding

Shielding concrete with neutron attenuating and absorbing components

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