Insights into the effect of the mineralogical composition of serpentine aggregates on the radiation attenuation properties of their concretes

Masoud, M.A.; El-Khayatt, A.M.; Kansouh, W.A.; Sakr, K.; Shahien, Mohamed G.; Zayed, Ahmed M.

doi:10.1016/j.conbuildmat.2020.120141

Cited by 42 publications

(12 citation statements)

References 56 publications

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“…Microhardness can reflect the strength of the matrix and interfacial transition zone (ITZ) and a loose ITZ obtained a low microhardness value. 32 The ITZ width can also be evaluated according to the trend of microhardness with the change in distance. In this study, microhardness was tested by a HVS-50 Vickers hardness tester ( Fig.…”

Section: Methodsmentioning

confidence: 99%

Autoclave-free ultra-early strength concrete preparation using an early strength agent and microstructure properties

Sun

Wang

et al. 2021

RSC Adv.

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Section: Methodsmentioning

confidence: 99%

Autoclave-free ultra-early strength concrete preparation using an early strength agent and microstructure properties

Sun

Wang

et al. 2021

RSC Adv.

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“…Most detector types use NaI(Tl); few studies used a stilbene scintillator to obtain readings for neutron and gamma absorption. In using a stilbene scintillator, the gamma ray counts are measured indirectly by transferring energy to the electrons through Compton’s scattering [ 109 ]. The use of this detector allows the measurement of counts for photon and neutron exposure in a single setup of the same source.…”

Section: Radiation Shieldingmentioning

confidence: 99%

“…On the basis of the mix composition of RSC used in the studies, the increase in the amount of cement used in the sample resulted in a gain in neutron shielding. This gain was achieved because chemically bound water in cement hydrates that contain hydrogen has a vital role in slowing down fast neutrons [ 109 ]. Another study agrees with this finding, indicating that a 1% increment in the cement’s moisture resulted in a 15% increment in the ∑ R (E n ) value [ 164 ].…”

Section: Radiation Shieldingmentioning

confidence: 99%

“…Serpentine is a metamorphic mineral with the chemical formula of Mg 3 Si 2 O 5 (OH) 4 . Serpentine concrete recorded ∑ R (E n ) of 0.0922 cm −1 at 4 MeV exposure, which was contributed largely by chemically bound water in serpentine [ 109 ]. The combination of serpentine and heavyweight minerals as the aggregate in concrete has also been studied.…”

Section: Radiation Shieldingmentioning

confidence: 99%

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Recent Trends in Advanced Radiation Shielding Concrete for Construction of Facilities: Materials and Properties

et al. 2022

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Nuclear energy offers a wide range of applications, which include power generation, X-ray imaging, and non-destructive tests, in many economic sectors. However, such applications come with the risk of harmful radiation, thereby requiring shielding to prevent harmful effects on the surrounding environment and users. Concrete has long been used as part of structures in nuclear power plants, X-ray imaging rooms, and radioactive storage. The direction of recent research is headed toward concrete’s ability in attenuating harmful energy radiated from nuclear sources through various alterations to its composition. Radiation shielding concrete (RSC) is a composite-based concrete that was developed in the last few years with heavy natural aggregates such as magnetite or barites. RSC is deemed a superior alternative to many types of traditional normal concrete in terms of shielding against the harmful radiation, and being economical and moldable. Given the merits of RSCs, this article presents a comprehensive review on the subject, considering the classifications, alternative materials, design additives, and type of heavy aggregates used. This literature review also provides critical reviews on RSC performance in terms of radiation shielding characteristics, mechanical strength, and durability. In addition, this work extensively reviews the trends of development research toward a broad understanding of the application possibilities of RSC as an advanced concrete product for producing a robust and green concrete composite for the construction of radiation shielding facilities as a better solution for protection from sources of radiation. Furthermore, this critical review provides a view of the progress made on RSCs and proposes avenues for future research on this hotspot research topic.

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“…There is also an interest in the potential of geopolymer as well as the effect of waste materials in radiation shielding, but typically focusing on the use of additional radiation absorbent aggregates to the geopolymer matrix [6][7][8]. Similar aggregates as well as other types of aggregates have also been studied for use in conventional and heavy concrete [9][10][11].…”

Section: Introduction mentioning

confidence: 99%

Gamma Radiation Shielding Properties of Slag and Fly Ash-based Geopolymers

2021

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Industrial waste-based geopolymer cement is a greener alternative to Ordinary Portland Cement (OPC) for radiation shielding with comparable mechanical properties without the production of CO 2 during synthesis. In this paper, the linear attenuation coefficient of slag and fly ash-based geopolymers, unmodified by aggregates, is measured and used to calculate the mass attenuation coefficients, half-value layer (HVL), and tenth-value layer (TVL) of the geopolymers. Narrow Beam Gamma Spectrometry with gamma energy of 0.662 MeV, 1.173 MeV, and 1.332 MeV was used to irradiate a series of slag and fly ash-based geopolymer paste of cylindrical shape with a diameter of 7.5 cm and height of 9.5 cm. Slag geopolymer has linear attenuation coefficient of 0.1642/cm, 0.1237/cm, 0.1150/cm, mass attenuation coefficient of 0.0782 cm 2 /g, 0.0589 cm 2 /g, 0.0548 cm 2 /g, the HVL of 4.222 cm, 5.609 cm, 6.056 cm, and TVL of 14.025 cm, 18.633 cm, 20.118 cm, respectively. Fly ash geopolymer has linear attenuation coefficient of 0.1387/cm, 0.1075/cm, and 0.0964/cm, mass attenuation coefficient of 0.0761 cm 2 /g, 0.0589 cm 2 /g, 0.0529 cm 2 /g, HVL of 4.998 cm, 6.453 cm, 7.202 cm, and TVL of 16.603 cm, 21.437 cm, 23.926 cm, respectively. Test samples made from slag-based geopolymers have a better shielding capability compared to fly ash-based geopolymers due to having higher attenuation coefficients as well as lower HVL and TVL, thus requiring less material to absorb radiation of the same energy level.

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Insights into the effect of the mineralogical composition of serpentine aggregates on the radiation attenuation properties of their concretes

Cited by 42 publications

References 56 publications

Autoclave-free ultra-early strength concrete preparation using an early strength agent and microstructure properties

Autoclave-free ultra-early strength concrete preparation using an early strength agent and microstructure properties

Recent Trends in Advanced Radiation Shielding Concrete for Construction of Facilities: Materials and Properties

Gamma Radiation Shielding Properties of Slag and Fly Ash-based Geopolymers

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