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Article
Effect of Al2O3 and Fly Ash Addition on Mechanical, Wear and Corrosion Properties of Al-Mg-Si Base Alloy

Author: Waleed T. Rashid وليد تركي راشد
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2019 Volume: 12 Issue: 2 Pages: 76-82
Publisher: Diyala University جامعة ديالى

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Abstract

The aim of this study is to studding the effect of addition of alumina and fly ash with the particles size 106μm and different weight rations (2:2, 2:4, 4:2) to aluminium- magnesium-silicon alloy on microstructure, mechanical properties, corrosion resistance, and wear. The vortex technique was used to prepare the composite material. The microscopic structure was also examined using optical microscopy and mechanical tests (hardness, tensile strength, yield strength and elongation) and wear test. The results showed that the composite material the containing (2% fly ash and 4% alumina) had the highest tensile strength (119 Mpa), yield strength (76 Mpa) and hardness (89 kg mm2), while it has the lowest ductility (5.3%). It was also found to have the lowest wear rate (1.8* 10-6gm cm) and the highest corrosion resistance.

Keywords

fly ash --- wear --- corrosion


Article
Performance of Geopolymer Concrete Exposed to Freezing and Thawing Cycles

Authors: Mohammed H. Shamsa --- Basil S. Al-Shathr --- Tareq S. al-Attar
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2019 Volume: 37 Issue: 3 Part (A) Engineering Pages: 78-84
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study, the effect of rapid freezing and thawing (ASTM C666– procedure A) on three different types of Geopolymer concrete studiedusing three types of pozzolanic material: fly ash, metakaolin and groundgranulated blast furnace slag (GGBFS). The Geopolymer concrete wasprepared using 400 kg of the pozzolanic material with alkaline liquidprepared at 8 molar concentration with normal fine and coarse aggregates.The ratio of alkaline to fly ash and GGBFS was 1.5: 1 and for metakaolinwas 2: 1 for workability and compressive strength requirements. Specimens(100 × 100 × 400) mm were exposed to 100, 200 and 300 cycles of freezingand thawing. The decrease in measured compressive strength was (23, 43,and 26%) for Fly ash, metakaolin and GGBFS respectively. The investigatedtypes of concrete showed good resistance to freezing and thawing. Thedurability factor of these types was (77%, 68%, and 81%) for fly ash,metakaolin, and GGBFS respectively.Keywords- Freezing and thawing,


Article
TREATMENT FLY ASH OF AL MUSAYYIB THERMAL POWER PLANT TO BE USED AS A POZZOLANIC MATERIAL

Authors: Rusul H. Al Rammahi --- Fadhil A. Rasin --- Faris H. Al Aani
Journal: KUFA JOURNAL OF ENGINEERING مجلة الكوفة الهندسية ISSN: 25230018 Year: 2019 Volume: 10 Issue: 3 Pages: 90-99
Publisher: University of Kufa جامعة الكوفة

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Abstract

Crude oil ash is the residue that is produced during oil combustion for instance fly ash, bottom ash or boiler slag which was primarily produced from the combustion of coal. With growth in oil burning power station, huge amount of fly ash considered as organic materials which are normally disposed in an on-site disposal system without any commercialization purpose. Previous researchers have studied the extraction of silica from agricultural wastes such as palm ash and rice husk ash (RHA) and FA (fly ash) by using leaching treatment method. In this study, the weaker acid, citric acid solution was used to replace the strong acid in leaching treatment to process. Result showed that the loss on ignition materials can be decrease to 12%. Meanwhile the silica can be extracted up to 54.4% from FA using citric acid leaching treatment under the optimum reaction time of 60 minutes with solution temperature of 60°C and concentration of citric acid 5% receded by gradual combustion at 900°C for 3 hours.


Article
تثبيتالترب باستخدام المضافات الكيميائية: مراجعة

Author: محمد نواف جرجيس الزيدي
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2019 Volume: 27 Issue: 1 Pages: 51-62
Publisher: Babylon University جامعة بابل

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Abstract

Searching for the best soil stabilizer to overcome problems occur by the soft soils are stillbeing the main concern, not only to achieve the required soil engineering properties but also byconsidering the cost and the effect to the environment. This review paper presents the results of experimental researches on soil stabilization by using the most chemical admixtures, which involved cement, lime and fly ash, and their effectiveness in the engineering properties of soil. Based on the literature review, the results show that addition of these chemical additives lead to significant improvement in workability, strength, durability and mechanical behaviour. On the other hand, it lead to a reduction in shrinkage, plasticity, compressibility and swell characteristics of soil. Also, the curing duration had significantly improved the strength properties of the stabilized soil with chemical additives. Using of each chemical additive and its suitability for a specific soil is highlighted in the research.

إن عملية البحث عن أفضل مادة لتثبيت التربة لغرض التغلب على مشاكل الترب الضعيفة ما زالت جارية، ليس فقط من أجل الحصول على الخصائص الهندسية المطلوبة في التربة ولكن أيضاً أخذ كلفة هذه المادة بعين الاعتبار وتأثيرها البيئي. يعرض هذا البحث مراجعة للدراسات العملية السابقة الخاصة بتثبيت التربة باستخدام المضافات الكيميائية الشائعة الاستخدام والتي تشمل السمنت والنورة والرّماد المتطاير وتأثيرها في الخصائص الهندسية للترب. بينت نتائج تلك الدراسات بأن إضافة تلك المواد الكيميائية إلى التربة تؤديإلى تحسن ملحوظ في كل من قابلية التشغيل والمقاومة والديمومة والسلوك الميكانيكي للتربة. من جهةٍ أخرى وُجد بأنها تؤدي إلى تقليل الانكماش واللدونة وخصائص الانضغاط والانتفاخ لتلك التربة. كذلك فقد لُوحظ بأن لمدة الإنضاج تأثير واضح في تحسّن خصائص المقاومة للتربة المثبتة. إن عملية استخدام كل مادة من هذه المواد الكيميائية المذكورة آنفاً وملاءمتها للاستخدام لتثبيت تربة معينة قد تم تفصيلها وذكرها في متن البحث.

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