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EFFECT OF SOME CHEMICAL ADDITIVES ON THE BEHAVIOR OF SABKHA SOIL
تأثير بعض المضافات الكيميائيه على تصرف الترب السبخه

Authors: Waad Abdul Sattar Hussain --- Safa Hussain Abid Awn
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2015 Volume: 19 Issue: 6 Pages: 1-17
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The presence of salts in soil may cause severe problems to structures constructed on it, because of high dissolution of salt particles when subjected to water from any source. The primary objective for this study is to investigate the behavior of single footing over different percentages of sabkha soil (5%, 10%, 20%, and 40%). A laboratory model, manufactured locally was used for this study. The sabkha soil is prepared by mixing ordinary soil with specified quantities of sodium chloride salt to have different percentages of salinity. The footing used is 75mm diameter circular steel plate and 20mm thickness and hold fix stress, with the aid of loading frame which in turn is attached to a firm table. Dial gages is attached to the fix table and place on the footing, to record settlement with time. The study includes also the effect cement and lime addition with different percentages(1%, 3% and 5%), on the collapsibility of sabkha soil. Mixing sabkha soil with 5% of cement will reduce collapse potential (S/B%)* upon wetting, 97%. While mixing sabkha soil with 3% lime will reduce collapse settlement 47%, On the other hand, mixing sabkha soil with 1% cement slurry increase the collapsibility 3%. This study also, shines the light on the effect of compaction on the properties of sabkha soil. The collapse potential (S/B%)* reduced 50%, when increasing compaction of sabkha soil model from 17.7 to 19 kN/m3.

ان احتواء التربه على الاملاح بجميع انواعها يؤدي الى حدوث اضرار كبيره للمنشات المقامه عليها نتيجة للذوبان السريع للاملاحلحظة ترطيبها بالماء من اي مصدر. تتطرق هذه الدراسه لتصرف اساس منفرد محمل مركزي ا موضوع على تربه تحتوي على نسب مختلفه مناملاح كلوريد الصوديوم و دراسة امكانية تحسين خواص هذه التربه الانهياريه باضافة مادتي السمنت او النوره . تم استخدام موديل مختبري تمتصنيعه محلي ا ,كما وتم تحضير التربه بمزج التربه الاعتياديه مع نسب مختلفه من ملح كلوريد الصوديوم ) 5 ,% 10 ,% 20 ,% 40 %(. تماستعمال اساس دائري بقطر 75 ملم مصنوع من الحديد بسمك 20 ملم. يتم التحكم بالضغط من خلال عمود تسليط الضغط الذي يثبت بصوره عموديهبواسطة طاوله حديديه ثابته ويثقل يدويا باثقال ثابته لتسليط اجهاد ثابت 22 كيلو باسكال. تم تثبيت المقاييس النابضيه لقياس هبوط الاساس معالزمن . تتضمن الدراسه تاثير اضافة مادة السمنت والنوره بنسب مختلفه على تقليل هبوط التربه الملحيه. حيث اضهرت الدراسه ان خلط 5 % منالسمنت مع التربه الملحيه يقلل من مقدار الهبوط 97 % وهو تحسن كبير لهذا النوع من الترب الانهياريه. اضافة لذلك فان خلط 3 % من النوره معهذه الترب يقلل من مقدار الهبوط نتيجة الذوبان حوالي 47 %. من ناحيه اخرى فان الدمك يحسن من خواص هذه الترب عند الاغمار بالماء. حيثتم تقليل مقدار الهبوط 50 % عند زيادة الدمك من 17.7 كيلو نيوتن/متر مكعب الى 19 كيلو نيوتن/متر مكعب.


Article
EFFECT OF BURNING CYCLES ON THE PHYSICAL PROPERTIES OF CLAY

Authors: Safa Hussain Abid Awn --- Waad Abdul Sattar Hussain --- Hassan Obaid Abbas
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2019 Volume: 23 Issue: 2 Pages: 79-92
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Natural soil is exposed, like other elements of the construction, to significant changes in temperatures are sources of forest fires or volcanic eruptions or natural bulky. Usually, accompanied by significant changes in temperatures of up to more than 300 degrees centigrade. Therefore, the need arises to study the effect of burning clayey soils, on the grain distribution and distribution of particleboard intricacies and atterbering limit and soil classification, in addition to the direct impact on the variables for the design of foundations such as the cohesion of the soil. The soil used was naturally clayey soil brought from Diyala province with (Liquid limit=56%, Plastic limit=51%, Specific gravity=2.59, the soil is classified as OH (Organic clays of medium to high plasticity). The soil was burned at different temperatures (75- 150- 300- 600 ° C) using special oven for burning at high temperature, the study was directed to investigate the effect of repeat arson for each grade and study changes in soil properties and distribution particleboard and suitability of the construction. The study showed basic change in the particle distribution and Atterbering limits which means changing the engineering properties for the design of foundations construction which indicates the importance of this types of research and potential development to expand in this area and develop ways to put construction solutions for such cases. A reduction percent in plastic limit was 20% and 26% at the end of the fourth cycle at 300oC and 150oC respectively. Author Discoverd that the soil type changed from OH to MH after the first burning cycle at 75oC. With the repetitive burning cycle, more changes on soil properties and type accrue. The soil is Ml after the fourth burning cycle at 75oC.

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