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Studying Strength and Stiffness Characteristics of Sand Stabilized with Cement and Lime Additives
دراسة خصائص المقاومة والصلادة للرمل المثبت بمضافات السمنت والنورة

Authors: Zeena W.S. Abbawi --- Kawther.Y.H.AL-Soudany
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2015 Volume: 33 Issue: 8 Part (A) Engineering Pages: 1857-1875
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The present work investigates the strength characteristics of sand stabilized with two additives (cement and lime) each alone at different percentages ranging between 1-10%. Sand mixed with different additive contents are statically compacted in perforated tubes, 38 mm in diameter and 200mm in length, the perforated holes are 2mm in diameter along the tube. Compaction is carefully controlled by compressing the sand to the required density by two plungers at top and bottom, two ends of the samples are waxed and soaked for 7 and 28 days in water. Unconfined compression test were performed, the strength and stiffness were determined for all the samples. Results referred to an increase in strength and stiffness of stabilized sand with increasing additives content, cement treatment improved strength significantly rather than lime and soaking time plays an important role in increasing compressive strength of sand treated with cement and lime. Also results showed that the type of failure behavior varied greatly from plastic to brittle. An empirical equation was derived for the unconfined compression strength depending on type of additive and soaking time.

يتحرى هذا البحث عن خصائص المقاومة للر مل المثبت بمختلف النسب من المضافات مثل السمنت والنورة، يخلط الرمل بمختلف النسب المستخدمة ويرص استاتيكيا في انابيب صنعت لهذا الغرض بقطر 38ملم وطول 200ملم وذو فتحات بقطر 2 ملم على طول الأنبوب . تجرى عملية الرص بحذر شديد وبالكثافة المطلوبة بوضع الرمل بين سدادتين في الأعلى والأسفل ويشمع النموذج بالشمع ويغمربالماء لفترة 7 و28 يوم. اجري فحص الأنضغاط الغير المحصور لغرض قياس المقاومة والصلادة للرمل المثبت . اشارت النتائج لزيادة المقاومة و الصلادة للرمل المثبت بزيادة نسبة المادة المضافة ,اظهرت النتائج ان التحسين بالمقاومة كان اكثرفي السمننت مقارنة بالنورة وان زيادة وقت الغمر بالماء يلعب دور كبير في زيادة المقاومة للرمل المعالج بالسمنت والنورة. كما تم اشتقاق معادلة لحساب المقاومة اعتمادا على نوع المادة المضافة ووقت الغمر.


Article
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF HOMOGENIZED STIR CASTING ALUMINUM BRONZE ALLOYS

Authors: Sami Abualnoun Ajeel --- Rabiha S. Yaseen --- Asaad Kadhim Eqal
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2018 Volume: 11 Issue: 3 Pages: 345-356
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

In demand to the industrial needs to produce Cu-Al alloys with controlled chemical compositions. The present research focuses on the production of Cu-Al alloys with different aluminum additions of 1.9, 3.6, 5.8 and 7.7 wt. % by stir casting method in argon atmosphere. Then, homogenized treatment was done for these alloys at 850 oC in different periods of soaking time of 2, 4, and 6 hrs to determine the best conditions for increasing the mechanical properties. This is carried out in the α phase region. The microstructure of the samples is analyzed by using Optical and Scanning Electron Microscopy (SEM) with (EDS). The results showed the mechanical properties of copper were increased with increasing in Aluminum content. The microstructure of the castings consist of the dendiritic structure, columinar grains and segregation. The results showed that after homogenization, the microstructure changed to fine grains, elimination of the columnar segregation and the clusters disappeared. The XRD results show that the phases are α (Cu-rich) phase as highest peaks and the small amount of CuAl2 phase. The best Aluminum content value was 7.7 wt % and the soaking time 4 hrs were given the high hardness 204 Hv and the highest ultimate tensile stress value of 383.8 Mpa

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