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عمر حامد محمد عبد القادر Omar Hamed Mohamed Abd Elkader

Associate Professor

عضو هيئة تدريس

كلية العلوم
كلية العلوم - قسم الفيزياء والفلك - مبني رقم 4 - 1ب 03
المنشورات
مقال فى مجلة
2012

Chemical activation of calcium aluminate cement composites cured at elevated temperature

, Nasser Y. Mostafa , Z.I. Zaki , Omar H. Abd Elkader . 2012

The influence of sodium sulfate, as an activator, on the hydration of calcium aluminate cement (CAC)–fly
ash (FA)–silica fume (SF) composites was investigated. Different mixes of CAC with 20% pozzolans (20%
FA, 20% SF and 10% FA + 10% SF) were prepared and hydrated at 38 C for up to 28 days. The hydration
products were investigated by XRD, DSC and SEM. The results showed that sodium sulfate accelerated
the hydration reactions of calcium aluminate cement as well as the reactions of FA and SF with CAH10
and C2AH8 to form the strätlingite (C2ASH8). The later reactions prevent the strength loss by preventing
the conversion of CAH10 and C2AH8 to the cubic C3AH6 phase. The acceleration effect of Na2SO4 on the
reactivity of fly ash was more pronounced than on the reactivity of silica fume with respect to reaction
with CAH10 and C2AH8 phases.

رقم المجلد
34
رقم الانشاء
34
مجلة/صحيفة
Cement & Concrete Composites
الصفحات
1187–1193
مزيد من المنشورات
publications

Poly Lactic Acid (PLA) nanofiber scaffold has enjoyed great interest as a candidate bioactive material for tissue
regeneration. However, the hydrophobic nature of PLA and its weak mechanical…

بواسطة Omar H. Abd‑Elkader
2018
publications

Very little is known about the elemental composition and possible sources of fine aerosol particles from Mediterranean
megacities. Fine aerosol particles were collected at a residential-…

بواسطة Omar H. Abd‑Elkader
2019
publications

Herein, we described the modification of chitosan with cyanuric chloride as a mediator for preparation of chitosan-s-triazinylbis(
2-aminomethylpyridine) and chitosan-s-triazinyl-bis(8-…

بواسطة Omar H. Abd‑Elkader
2020