Yazar "Alsaiari, Norah Salem" seçeneğine göre listele

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    Synthesis and characterization of metakaolin-based geopolymers doped with CRT waste glass for radiation shielding applications
    (Elsevier, 2024) Al-Buriahi, M. S.; Kırkbınar, Mine; Alrowaili, Ziyad Awadh; Katubi, Khadijah Mohammedsaleh; Alsaiari, Norah Salem; Alalawi, Amani; Alomayrah, Nora; Olarinoye, I. O.
    This study presents the influence of CRT glass on the gamma-ray interaction processes in metakaolin-based geopolymers. Four batches of G-CRT composites (namely, G, G-10CRT, G-20CRT, and G-30CRT, which represent geopolymer (G) samples doped with 0, 10, 20, and 30 wt% of CRT glass) were prepared using the cold hydrostatic press method. The mass attenuation coefficients of the prepared C-xCRT samples were computed using XCOM and FLUKA simulations for photons within the energy range of 15 keV-15 MeV. The density of the pristine geopolymer increased from about 1.86 g/cm3 3 to 2.09, 2.26, and 2.34 g/cm3 3 for G-10CRT, G-20CRT, and G-30CRT, respectively. The photon mass and linear attenuation coefficients of the geopolymers increased with CRT glass concentration. The half-value layer and mean free path were within the ranges 0.070-18.079 cm and 0.101-26.083 cm for G; 0.036-15.110 cm and 0.052-21.799 cm for G-10CRT; 0.024-13.197 cm and 0.014-19.039 cm for G-20CRT; and 0.018-12.074 and 0.026-17.419 cm for G-30CRT. The G-30CRT had the best gamma attenuating prowess in contrast to other G-xCRT. CRT-rich G-xCRT had a higher effective atomic number. For 10 mm thick geopolymer, the absorbed dose rates were 0.211 mu R/h, 0.66 mu R/h, 1.11 mu R/h, and 1.55 mu R/h for G, G-10CRT, G-20CRT, and G-30CRT, respectively, for 100 keV photons. The introduction of CRT glass into the geopolymer matrix improved their photon interaction cross-section. The geopolymers showed outstanding photon interaction ability compared to ordinary concrete and some shielding glasses at low photon energies. The CRT glass-doped geopolymer samples are useful for preparing radiation shielding concrete.
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    Synthesis properties and neutron attenuation of new geopolymers containing Si, O, Na and Al: role of Pb addition
    (Springer, 2024) Echeweozo, E. O.; Alsaiari, Norah Salem; Alomairy, Sultan; Çalışkan, Fatih; Kırkbınar, Mine; Al-Buriahi M. S.
    Lead (II) oxide (PbO) has shown high prospect in modifying mechanical, physical, neutron and charge particle interaction properties of geopolymer due to high bonding matrix. In this study, the impact of PbO doping on the microstructure, mechanical strength, neutron and charge particles interaction properties of geopolymer composites was examined. The undoped and doped geopolymer powders were produced and sintered above 1100 degrees C for 1 h to obtain denser materials. The X-ray diffraction (XRD) analysis showed that the material is rich in cristobalite (C), mullite (M), and lead silicate (P) phases. The EDS analysis of geopolymer gave Si, O, Na and Al with 40.87, 35.37, 6.06 and 17.68% wt respectively as major elements. The Vickers hardness (HV) values for GEO, GEO-10Pb and GEO-20Pb samples were obtained as 595, 647 and 682 HV respectively under 0.5 kg load. The showed that the introduction of 10% and 20% PbO significantly improved the charge particle attenuation, density and Vickers Hardness of the geopolymer while the total fast neutron removal cross-section decreases with increasing lead content.