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Article
Improvement of Iraqi Red Kaolin as a Refractory Material
تحسین خصائص الكاؤلین الاحمر العراقي كمادة حراریة

Authors: Amel S. Merzah --- Younis Muhsin --- Yasamin k. Mahmood
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 4 Part (A) Engineering Pages: 952-959
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this work refractory material was prepared from Iraqi red kaolin with the addition of different proportions of silica and alumina (10, 15, 20 %) for each one and the red kaolin 70%. The powders were mixed in a ball mill, sieved, formed, dried at 110 oC for 8 hrs and then fired at different temperatures 800, 900, 1000 and 1100oC for 2 hrs. The physical properties(linear and volumetric shrinkage ,apparent density and porosity) were calculated from the measured data .It was found that the higher the firing temperature the better the properties of the prepared samples for a given mixture ,the best properties obtained in this work was 70%red kaolin,10%silica and 20%alumina).

في هذا البحث تم تحضير مادة حرارية من الكاؤلين الاحمر العراقي مع اضافة نسب مختلفة من السليكا والالومينا (10و15و20%)لكل منهما و70 % كاؤلين احمر.تم مزج المساحيق حسب النسب المذكورة بواسطة طاحونة ذات الكرات ونخلت ,شكلت,جففت بدرجة 110 درجة مئوية لمدة 8 ساعات ثم حرقت بدرجات حرارية مختلفة 800,900,1000 و1100 درجة مئوية لمدة ساعتان .تم حساب الخصائص الفيزياوية(الانكماش الخطي والحجمي والكثافة الظاهرية والمسامية) للنماذج المحروقة من القيم المقاسة.وجد انه كلما زادت درجة حرارة الحرق حصلنا على خواص افضل ولقد وجد بأن افضل نتائج تم الحصول عليها للنموذج ذو المحتوى (70% كاؤلين و10% سليكا و20% الومينا).


Article
Reinforcement Steel Corrosion Reduction by Using Fly Ash from South Baghdad Power Plant

Authors: Amel S. Merzah --- Huda N. Kalifa --- Taha H. Abood --- Ishraq Abdulkarim
Journal: Iraqi Journal of Chemical and Petroleum Engineering المجلة العراقية للهندسة الكيمياوية وهندسة النفط ISSN: 19974884/E26180707 Year: 2013 Volume: 14 Issue: 1 Pages: 15-24
Publisher: Baghdad University جامعة بغداد

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Abstract

Corrosion- induced damage in reinforced concrete structure such as bridges, parking garages, and buildings, and the related cost for maintaining them in a serviceable condition, is a source of major concern for the owners of these structures. Fly ash produced from south Baghdad power plant with different concentrations (20, 25 and 30) % by weight from the cement ratio were used as a corrosion inhibitor as a weight ratio from the cement content. The concrete batch ratio under study was (1:1.5:3) cement, sand and gravel respectively which is used in Iraq. All the raw materials used were locally manufactured. Concrete slabs (250x250x70) mm dimensions were casted, using Poly-wood molds. Two steel bars were embedded in the central position of each slab at the mid- height (about 35 mm), with a space of 100 mm between each other. A 16 concrete slabs were prepared (0, 20, 25 and 30) wt. % of fly ash. The specimens were partially immersed in 3.5 wt. % NaCl solution in order to predict the corrosion. Half-cell potential test technique was used to estimate the corrosion rate which is occurred in the steel bar due to the migration of chloride ions through the concrete, depending on the ASTM C876-08. The result shows that the potential values of steel in concrete were shifts to the positive direction with increasing the percentage of fly ash, because the reduction of porosity by the addition of fly ash which fill the pores and inhibit the chloride ions to reach to steel. The results also show that the further increase of fly ash (30%) the possibility of carbonation is increased which result in reduction its alkalinity, thereby permitting corrosion of embedded steel.

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Article
PREPARATION OF PVC HOLLOW FIBER MEMBRANE USING (DMAC/ACETONE)

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Abstract

Membrane manufacturing system was operated using dry/wet phase inversion process. A sample of hollow fiber membrane was prepared using (17% wt PVC) polyvinyl chloride as membrane material and N, N Dimethylacetamide (DMAC) as solvent in the first run and the second run was made using (DMAC/Acetone) of ratio 3.4 w/w. Scanning electron microscope (SEM) was used to predict the structure and dimensions of hollow fiber membranes prepared. The ultrafiltration experiments were performed using soluble polymeric solute poly ethylene glycol (PEG) of molecular weight (20000 Dalton) 800 ppm solution 25 °C temperature and 1 bar pressure. The experimental results show that pure water permeation increased from 25.7 to 32.2 (L/m2.h.bar) by adding acetone to the dope solution, while rejection decreased from 91.8 to 63.2%.

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