Impact of alkali activated mortar incorporating different heavy metals on immobilization proficiency using gamma rays attenuation

Khater, H. M.; Ramadan, Wageeh; Gharieb, Mahmoud

doi:10.1016/j.pnucene.2021.103729

Cited by 16 publications

(5 citation statements)

References 31 publications

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“…Finally, we compared the tenth value layer (TVL) (the amount of material needed to absorb 90% of the radiation) of the four WO 3 -containing mortars in with other mortars reported in the literature (Figure 9). These mortars are WL13 (slag mortar having a fine lead slag aggregate), WA13 (slag mortar having fine aggregates of air-cooled slag), WS13 (slag mortar having fine aggregates of sand), and PC13 (normal cement mortar) [16]. At 0.662 MeV, the TVL values for the present mortars are 12.258, 11.299, 11.825, and 10.877 cm, all smaller than those reported for WL13, WA13, WS13, and PC13.…”

Section: Radiation Shielding Featuresmentioning

confidence: 99%

“…The effect of heavy metals, namely barium sulfate, lead slag, and heavy iron metal wastes, on the density and radioactive attenuation coefficients of geopolymer mortars has been determined [16]. Two radioactive isotopes, Cs 137 and Co 60 , were used to determine the radiation protection properties at three energies, namely 662, 1173, and 1332 keV.…”

Section: Introductionmentioning

confidence: 99%

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Novel Shielding Mortars for Radiation Source Transportation and Storage

et al. 2022

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New types of mortar, M1 (60% sand, 25% cement, 10% ball clay, and 15% WO3), M2 (50% sand, 25% cement, 10% ball clay, and 25% WO3), M3 (60% sand, 25% cement, 10% Barite, and 15% WO3), and M4 (50% sand, 25% cement, 10% Barite, and 25% WO3), were prepared and the impact of WO3 and barite on their radiation shielding performance and mechanical properties was evaluated. The radiation attenuation factors were evaluated using five radioactive point sources, and a sodium iodide (NaI) scintillation detector (3″ × 3″) was used to detect the attenuation of gamma ray photons emitted from radioactive sources. The density values of the mortar samples lie within the range of 2.358 and 2.602 g/cm3. The compressive strength and the tensile strength of the prepared mortars increased with the increasing percentage of WO3. The M4 mortar had the highest linear attenuation coefficient (LAC) value. The LAC results demonstrated that adding barite and a high percentage of WO3 into the mortars notably enhanced the radiation shielding performance of the prepared mortar. The relationship between the half value layer (HVL) and the energy is direct, and so was used to calculate the thickness of mortar needed to absorb or scatter half the number of low-energy photons falling on the samples. At 0.06 MeV, the HVL values of the samples were 0.412, 0.280, 0.242, and 0.184 cm for samples M1–M4, respectively. The highest HVL values, obtained at 1.408 MeV, were 5.516, 5.202, 5.358, and 5.041 cm. Thus, a thinner layer of the M4 sample provided comparable attenuation of photons and radiation protection to the thicker M1–M3 samples. The new material is promising as an effective shield of radiation-emitting sources during transportation and long-term storage.

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Section: Radiation Shielding Featuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Shielding Mortars for Radiation Source Transportation and Storage

et al. 2022

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“…According to the IEA, one of the strategies for lowering carbon emissions is to replace cement with other cementitious materials [ 3 ]. As a result, many studies have substituted industrial waste and byproducts for cement in certain constructions [ 4 , 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effects of Recycled Aggregate and Mineral Admixtures on the Mechanical Properties and Performance of Concrete

2023

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In this work, the effects of recycled concrete aggregate, modified with mineral admixtures and nanosilica, on the mechanical properties and performance of concrete after curing in tap water for 28 and 90 days were investigated. The compressive (ƒc), indirect tensile (ƒt), and flexural (ƒb) strengths for the cured concrete specimens were measured, and the concrete strength ratios were analyzed. The water and rapid chloride permeabilities were measured. SEM analysis of the microstructure was also performed. The coarse aggregates used were dolomite (control) and recycled concrete aggregate, incorporating different mineral admixtures, including ground, granulated blast slag, granite, and nanosilica. It was found that the slump values of the dolomite concrete decreased compared with recycled aggregate concrete. Compared to the control mix produced with the recycled aggregate, the slump value of the concrete mixes created with the recycled aggregate increased by approximately 11.1% with the addition of binary cementing materials of 1% NS. The results also indicate that the concrete mix containing the recycled aggregate had the highest compressive strength, tensile strength, and flexural strength compared to that of the dolomite aggregate. Regarding the compressive strength, the addition of 1% NS and 15% slag improved the physico-mechanical properties of the recycled aggregate concretes compared to the other mixes after curing in tap water. Compared to the other mixes, the concrete mix containing 1% NS and 15% slag had a comparatively dense and compact microstructure.

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“…In other research work, Khater and Ghareib [64] produced a slag-based geopolymer mortar to immobilize heavy metals, such as barium sulfate, lead slag, lead phosphate, and electric arc furnace slag. Furthermore, the same product was efficiently used as a shielding material for gamma rays [65]. Paving blocks prepared with blends of fly ash and 40 to 80% of hazardous waste were characterized as eco-friendly materials due to the negligible leaching of toxic and heavy metals, such as lead, arsenic, zinc, chromium, and cadmium [66].…”

Section: Introductionmentioning

confidence: 99%

Scientometric Analysis of Global Research on the Utilization of Geopolymer Composites in Construction Applications

et al. 2023

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This study conducts a scientometric review on the use of geopolymer mortar and composites in different construction applications. It aims to analyze the findings of past research and reveal the research constituents, development trends, and knowledge gaps. The Scopus database was employed to retrieve the relevant publications, while Bibliometrix was used to conduct the statistical analyses. Results revealed a steady and gradual increase in the number of publications after 2013, as the annual growth rate increased from 23.9% to 45.2% between the timeframes 2003–2013 and 2014–2022, respectively. The analysis highlighted that many authors collaborated on different construction applications of geopolymers regardless of geographic location. Meanwhile, Construction and Building Materials, China, and Universiti Malaysia Perlis were found to be the predominant journal, country, and institution, respectively. The scientometric analysis showed that the most frequently investigated applications for geopolymer mortars and composites were fire resistance, corrosion protection, and repair. Research gaps highlighted that other applications are not as well investigated despite the promising performance of the geopolymer composites, including 3D printing, heavy metals absorption, environmental protection, and underwater applications. Future research is required to assess the use of other alumina and silica-rich binders in geopolymers while also exploring their lifecycle assessment and economic impact.

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Impact of alkali activated mortar incorporating different heavy metals on immobilization proficiency using gamma rays attenuation

Cited by 16 publications

References 31 publications

Novel Shielding Mortars for Radiation Source Transportation and Storage

Novel Shielding Mortars for Radiation Source Transportation and Storage

Investigating the Effects of Recycled Aggregate and Mineral Admixtures on the Mechanical Properties and Performance of Concrete

Scientometric Analysis of Global Research on the Utilization of Geopolymer Composites in Construction Applications

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