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RISS 인기검색어
- 검색키워드
- 저자 : Alaa Mohsen (검색결과 2 건)
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The Effect of Superplasticizers on Eco-friendly Low-Energy One-Part Alkali-Activated Slag
M. Refaie,Alaa Mohsen,El-Sayed A. R. Nasr,Mohamed Kohail 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.6
One-part alkali-activated materials (OP-AAM) have become a promising binder with low carbon and energy requirements associated with superior mechanical and durability characteristics. This study aims to employ commercial superplasticizers (naphthalene-based “Nb-SP” and polycarboxylate-based “PCb-SP”), as well as laboratory-prepared one (phenol–formaldehyde sulfanilate “PFS-SP”) in enhancing the properties of OP-AAM. The main problem of superplasticizers (SPs) in the AAM is their hydrolysis in the alkaline activator (NaOH) used in the activation reactions. Therefore, the thermo-chemical treatment process was utilized to mitigate the high activator alkalinity by impeding the NaOH in the aluminosilicate precursor matrix. The OP-AAM was fabricated from thermo-chemical treatment powder (TCT-P) resulting from sintering blast furnace slag (GGBFS) with 10 wt% NaOH at 300 and 500 °C. The XRD-pattern showed that NaOH was impeded in the GGBFS via sodium aluminum silicate phase formation after sintering at 500 °C. The results showed that the admixed OP-AAM prepared from TCT-P at 500 °C greatly enhanced the workability and mechanical properties. The PFS-SP proved its efficiency in improving the properties of OP-AAM prepared TCT-P at 300 and 500 °C, referring to its high stability in an alkaline medium. While PCb-SP reinforced the properties of OP-AAM prepared from TCT-P at 500 °C only, proving that PCb-SP promotes high capability in TCT-P-500 as well as in Portland cement.
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Effect of Global Geometric Imperfections on the Cyclic Response of Moment Resisting Frame Columns
Nassr Salman,Alaa Al-Habbobi,Mohsen Habelalmateen 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.3
This paper investigates the impact of explicit initial geometric imperfections on the seismic response of wide flange steel column sections in moment resisting frames. Ten wide-flange sections (five light and five stocky) were chosen in the parametric investigation. The columns were subjected to a combined effect of axial load and lateral cyclic displacement protocol as per ASCE guidelines. Target axial load ranging from 20 to 100 of the column axial capacity was chosen to cover a wide range of axial loads employed in practice. Nonlinear finite element was used to conduct the analyses throughout the paper. The theoretical models were validated against available experimental data. The study indicated that the reduction in the drift angle capacity of the imperfect compared to the straight sections is approximately ranging between 0% and 60% for various axial load ratios. Results has also revealed that the effect of imperfection is more pronounced for stocky steel sections under high axial load ratios, although other sections responded in a variable degrees. Design recommendations were proposed to aid in better simulation of advanced structural analyses.
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