De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Ramadan, M.; Kohail, Mohamed; Abadel, Aref A.; Alharbi, Yousef R.; Tuladhar, Rabin; Mohsen, Alaa

doi:10.1016/j.cscm.2022.e01344

Cited by 11 publications

(4 citation statements)

References 87 publications

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“…According to the Unified Soil Classification System, the tested soil was classified as a fine-grained high-liquid limit clay (CH). Also, the chemical composition of the tested granite residual soil was analyzed using X-ray powder diffraction (XRD) to obtain X-ray diffraction patterns [41][42][43]. Subsequently, semi-quantitative analysis was conducted using JADE software, as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

Effect of Initial Conditions on the Pore Structure and Bimodal Soil–Water Characteristic Curve of Compacted Granite Residual Soil

Chen,

Ma,

Zhou

et al. 2024

Processes

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Granite residual soil typically forms complex pore structures and exhibits high water sensitivity due to physical and chemical weathering processes. Changes in initial compaction conditions significantly affect the mechanical and hydraulic properties of in situ granite residual soil subgrades, with these variations fundamentally related to changes in pore structure and soil–water characteristics. This study investigates the pore structure and bimodal soil–water characteristic curve (SWCC) of a compacted granite residual soil through laboratory tests and mercury intrusion porosimetry tests. Nine initial conditions were selected based on potential in situ compaction conditions of subgrades, and their effects on the pore size distribution (PSD) and SWCC were thoroughly analyzed. The results show strong correlations between bimodal pore structure and SWCC. The size and volume of inter-aggregate pores exhibit noticeable changes with initial conditions, affecting SWCC within the low and middle suction range. Conversely, the intra-aggregate pores, which constitute over 60% of the pore structures, remain nearly intact across different initial conditions, resulting in similar SWCCs within the high suction range. As the compaction energy increases, the inter-aggregate pores are compressed and lead to a higher water retention capacity. In addition, as the compaction water content increases, the SWCC becomes less sensitive to compaction energy after the aggregates in the pore structure are fully saturated. Additionally, a three-dimensional bimodal SWCC equation is proposed and validated using test data with an R2 value above 0.98. These findings offer valuable insights for the design and quality control of granite residual soil subgrades.

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Section: Methodsmentioning

confidence: 99%

Effect of Initial Conditions on the Pore Structure and Bimodal Soil–Water Characteristic Curve of Compacted Granite Residual Soil

Chen,

Ma,

Zhou

et al. 2024

Processes

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“…Water of consistency test. The water of consistency test gives the proper W/B ratio for the paste to give optimum homogeneity in terms of strength and workability 104 . Figure 5 shows the water consistency values for TP, DM, OP-10M, OP-20M, and OP-30M.…”

Section: Mini Slump Testmentioning

confidence: 99%

Utilization of optimized microwave sintering to produce safe and sustainable one-part alkali-activated materials

Refaat

Mohsen

Nasr

et al. 2023

Sci Rep

Self Cite

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Sodium hydroxide (NaOH) as an alkaline activator presents a vital limitation in the mass production of alkali-activated binders due to its severe effect on users’ safety. In this study, safe and sustainable one-part alkali-activated slag mixes (OP-AAS) were prepared through an efficient microwave sintering for a mixture of active amorphous ground granulated blast furnace slag (GGBFS) and sodium hydroxide powder (NaOH). Different microwave-sintered powders were prepared using microwave energy of power 900 W for the mixture at different treatment periods (10, 20, and 30 min). Fresh and hardened properties of different OP-AAS mixes were studied. Moreover, the phase composition and microstructure were investigated using X-ray diffraction (XRD) analysis and scanning electron microscope (SEM). Cytotoxicity/viability testing was performed to evaluate the cell death induced by the developed materials to measure their safety for the user. According to compressive strength, cytotoxicity/viability analysis, environmental impact and cost calculation of developed OP-AAS, it is concluded that employing microwave sintering for a short duration is sufficient to produce safe binding materials with adequate mechanical properties suitable for commercial applications in the construction sector.

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“…Therefore, various alternative material solutions are sought. To date, the highest attention has been paid to Bi 2 O 3 [ 7 , 8 , 9 , 10 ] followed by TiO 2 [ 11 , 12 , 13 , 14 ], Fe 2 O 3 [ 15 , 16 , 17 ] or WO 3 [ 18 , 19 , 20 , 21 , 22 ]. Bismuth oxide exhibits similarly high radiation attenuating properties regarding gamma radiation as lead, but is considered non-toxic.…”

Section: Introductionmentioning

confidence: 99%

“…It is widely agreed that, typically, the optimal content of nanoparticles lies within the range of 0.5 to 5% mass of binder [ 44 , 45 , 46 ]. However, for radiation shielding applications, the amount of a single nano-admixture frequently ranges between 3 and 10 wt% [ 8 , 10 , 12 , 13 , 14 , 17 , 47 ], therefore, higher replacement rates of a binder with nanoparticles might lead to undesirable alterations in the hydration process of cementitious systems.…”

Section: Introductionmentioning

confidence: 99%

Functional Bi2O3/Gd2O3 Silica-Coated Structures for Improvement of Early Age and Radiation Shielding Performance of Cement Pastes

Cendrowski,

Federowicz,

Techman

et al. 2024

Nanomaterials

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This study presents a new approach towards the production of sol-gel silica-coated Bi2O3/Gd2O3 cement additives towards the improvement of early mechanical performance and radiation attenuation. Two types of silica coatings, which varied in synthesis method and morphology, were used to coat Bi2O3/Gd2O3 structures and evaluated as a cement filler in Portland cement pastes. Isothermal calorimetry studies and early strength evaluations confirmed that both proposed coating types can overcome retarded cement hydration process, attributed to Bi2O3 presence, resulting in improved one day compressive strength by 300% and 251% (depending on coating method) when compared to paste containing pristine Bi2O3 and Gd2O3 particles. Moreover, depending on the type of chosen coating type, various rheological performances of cement pastes can be achieved. Thanks to the proposed combination of materials, both gamma-rays and slow neutron attenuation in cement pastes can be simultaneously improved. The introduction of silica coating resulted in an increment of the gamma-ray and neutron shielding thanks to the increased probability of radiation interaction. Along with the positive early age effects of the synthesized structures, the 28 day mechanical performance of cement pastes was not suppressed, and was found to be comparable to that of the control specimen. As an outcome, silica-coated structures can be successfully used in radiation-shielding cement-based composites, e.g. with demanding early age performances.

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De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Cited by 11 publications

References 87 publications

Effect of Initial Conditions on the Pore Structure and Bimodal Soil–Water Characteristic Curve of Compacted Granite Residual Soil

Effect of Initial Conditions on the Pore Structure and Bimodal Soil–Water Characteristic Curve of Compacted Granite Residual Soil

Utilization of optimized microwave sintering to produce safe and sustainable one-part alkali-activated materials

Functional Bi2O3/Gd2O3 Silica-Coated Structures for Improvement of Early Age and Radiation Shielding Performance of Cement Pastes

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