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Article
STUDYING THE EFFECTS OF LEACHING ON TREATED GYPSUM-RICH SOIL

Author: Ali Nasir Ibrahim
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2019 Volume: 23 Issue: 1 Pages: 162-173
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

This wok focus on improving the permeability properties of gypseous soil by mixing the soil with three types of stabilizer materials, which are silicone oil, sodium silicate and bentonite. Four soil samples were prepared, first untreated soil, second mixture of 70% gepseous soil and 30% silicone oil, third mixture of 70% gypseous soil and 30% sodium silicate and forth mixture of 70 % gypseous soil and 30% bentonite . The leaching tests were conducted for all prepared soil using oedometer-permeability leaching device. The results show that the coefficient of permeability decreases with increasing of time, dissolved gypsum and leaching strain, this may attribute to the fact that the stabilizer materials fill the pores that produce from gypsum dissolution after leaching, thus in turn reduce the water fluctuate in the soil which minimize the gypsum dissolution.On the other hand the stabilizer materials work as an impermeable layer to prevent direct contact of water and gypsum particles. Where the leaching strain increases with increasing of dissolved gypsum as the leaching process continues. This behavior may be attributed to the continuous dissolution of gypsum that causes correspond a continuous settlement. Also leaching strain increases with void ratio increasing as the leaching process continue, where the continuous gypsum dissolution leads to increase in void ratio due to presence of pores. The treated gypseoussoil has less void ratio in comparison to untreated soil, due to reduction in gypsum dissolution for treated gypseous soil and thus in turn reduces leaching strain. Sodium silicate shows high efficiency in reducing coefficient of permeability compared to silicone oil and bentonite.


Article
Gypseous Soil Improvement by Silicone Oil
تحسين التربة الجبسية بدهن السيليكون

Authors: Ali Nasir Ibrahim علي ناصر ابراهيم --- Tom Schanz توم شانز
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2017 Volume: 20 Issue: 1 Pages: 49-58
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

Gypseous soils are usually stiff when they are dry especially because of the cementation of soil particles by gypsum, but great loss in strength and sudden increase in compressibility occur when these soils are fully or partially saturated. The dissolution of the cementing gypsum causes high softening of soil. The problem becomes more complicated when water flows through the gypseous soil causing leaching and movement of gypsum. This study examines the improvement of gypseous soil properties using the Silicone oil to minimize the effect of moisture on these soils. This study was conducted on artificial gypseous soil (mixture of 30% Silber sand & 70 % Pure Gypsum) treated with silicone oil in different percentages. The reason for use the silicone oil as an additive to study the gypseous soil properties is due to the leakages of oil products from oil refinery in north of Iraq build on gypseous soil, this oil products infiltrate to the foundation soil of the refinery building facilities. The results showed that the Silicone oil is a good material to modify the basic properties of the gypseous soil of collapsibility and shear strength, which are the main problems of this soil and retained the soil by an appropriate amount of the cohesion suitable for carrying the loads from the structure.

تكون الترب الجبسية في الغالب قوية عندما تكون جافة بسبب جزيئات الجبس التي تعمل كمادة رابطة لجزيئات التربة، لكن يحدث فقدان كبير في مقاومة التربة ونقصان مفاجئ في انضغاط هذا النوع من التربة عندما تكون مشبعة بالماء بصورة كلية او جزئية. ان ذوبان المادة الجبسية الرابطة يسبب طراوة عالية للتربة . المشكلة تصبح اكثر تعقيدا عند جريان الماء في الترب الجبسية والذي يسبب غسل وتحريك جزيئات الجبس. هذه الدراسة تختبر تحسين خواص الترب الجبسية باستخدام دهن السليكون لتقليل تاثير الرطوبة على هذا النوع من التربة. تم استخدام تربة جبسية اصطناعية مكونة من 30% رمل و70% جبس نقي في هذه الدراسة حيث تم خلطها مع مادة دهن السليكون بنسب مختلفة. ان الهدف من استخدام دهن السليكون كمادة مضافة لدراسة خواص الترب الجبسية هوة لمحاكاة عملية نضوح منتجات البترول من منشات التكرير في شمال العراق المشيدة على هذا النوع من الترب ، حيث ان منتجات البترول تتغلل في تربة اسس هذه الابنية.النتائج بينت ان المادة دهن السليكون هي مادة جيدة لتحسين خواص الانظغاطية ومقاومة القص للترب الجبسية، والتي تعتبر من المشاكل الرئيسية التي تواجه هذا النوع من الترب. وتؤدي الى احتفاظ التربة بنسبة ملائمة من التماسك لنقل احمال المشأ.

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