Yazar "Mohammed, Haneen" seçeneğine göre listele

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    Modelling joint deterioration in roller compacted concrete pavement
    (Springer, 2022) Mohammed, Haneen; Abed, Ahmed; Thom, Nick
    Joints in Roller Compacted Concrete (RCC) pavements are used to distribute traffic loading between adjacent slabs by friction. The Load Transfer Stiffness (LTS) of the joints has critical effects on RCC pavement performance near the joints. Research has shown that LTS can deteriorate over time due to traffic loading or environmental conditions. This study investigates the deterioration of LTS of RCC pavement joints and its effect on the fatigue cracking performance near the joints. To achieve that, first, an innovative experimental programme was designed to measure LTS as a function of number of load repetition, joint width, and RCC mix properties using a cyclic shear test setup. Second, a mathematical model was derived to predict LTS deterioration in joints. This model was validated against the experimental data. Lastly, an RCC pavement design model was developed using the LTS deterioration model. To demonstrate the application of the developed solution, a hypothetical RCC pavement structure consisting of four slabs was considered. The analysis results show that LTS has inverse relationship and direct impact of fatigue life of RCC. In particular, the results demonstrate that fatigue damage over an analysis period of 20 years is negligible if LTS is assumed constant, which is unrealistic, but it can reach 40% if LTS deterioration is considered in the analysis. Accordingly, this study recommends considering the deterioration of RCC joint LTS when design that kind of pavement structures. © 2022, The Author(s), under exclusive licence to Chinese Society of Pavement Engineering.
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    The role of la2O3 rare earth (RE) material in the enhancement of the radiation shielding, physical, mechanical and acoustic properties of the tellurite glasses
    (RADIATION EFFECTS AND DEFECTS IN SOLIDS, 2022) Malidarre, R. B.; Akkurt, I.; Ekmekci, I.; Hesham, M. H.; Mohammed, Haneen
    Understanding the influence of Rare-Earth Elements (REEs) in tellurite-rich glass is vital for developing the technology due to applications of REEs in various technologies like television displays, solid-state lasers, tunable waveguides, tunable fiber grating, etc. With this motivation, the present work analyzes the radiation shielding, physical, structural, mechanical and acoustic properties of the (1-x)TeO2-xLa(2)O(3): x = 5, 7, 10, 15 and 20 (mol%) glass samples. For this purpose, using user-friendly MCNPX Monte Carlo code the LaTe1-LaTe5 glass samples are irradiated, and thus the radiation shielding competencies are obtained for wide energy spans ranging from 0 to 15 MeV. The derived Half Value Layer (Delta(0.5)) outcomes are compared with the theoretical studies namely, Phy-X:PSD results for some selected energies. In addition, the mechanical features are obtained by the (Makishima Mackenzie) Mak-Mac Model. Based on the mechanical characteristics, acoustic properties are extracted and reported in this paper. The structure and dimensionality of the preferred samples are derived based on the Bergman and Kantor model for fluid and compositions with the help of the Fractal Bond Connectivity (FBC). Findings show that La2O3 is an effective Rare Earth (RE) material to increase the shielding ability of the LaTe glass samples from LaTe1 to LaTe5. Furthermore, from the obtained results can be concluded that the La2O3 RE material is able to break the glass structure and increase the linkage, and thus, the acoustic properties will be improved.