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Article
Long Term Strength and Durability of Clayey Soil Stabilized With Lime

Authors: Abdulrahman H. Al-Zubaydi --- Moafaq A. Al-Atalla --- Ibrahaim M. Al-Kiki
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 4 Pages: 725-735
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This study deals with durability characteristics and unconfined compressivestrength of clayey soil stabilized with lime. The tests comprises of unconfinedcompressive strength for samples stabilized with the optimum lime percent (4%),and subjected to cycles of the wet-dry, dry-wet and freeze-thaw durability tests aswell as, long-term soaking and slake tests.The results indicated that, the efficiency of the lime in the improvement ofunconfined compressive strength of clayey soil is of negative effect in the longterm durability periods The wetting-drying cycles showed greater reduction inunconfined compressive strength than drying-wetting cycles, while the volumechange of samples which subjected to drying at first, was greater than thoseconducted with wetting. On the other hand, freezing-thawing cycles causes adecreasing in the unconfined compressive strength values, and the reduction ratiowas greater than wetting and drying cases. But, during soaking tests it was foundthat at early soaking periods, the lime stabilized samples continuously gainingstrength, but beyond this the strength decreased with increasing soaking period.Finally, the stabilized samples with (4 and 6%) lime becomes more durableagainst the cycles of wetting and drying.


Article
Strength and Consolidation Characteristics of Compacted Clayey Soil Having a Special Case of Standard Compaction Curve
خصائص المقاومة والانضمام لتربة طينية مرصوصة ذات حالة خاصة لمنحني الرص القياسي

Authors: Ibrahaim M. Al-Kiki --- Abdulrahman H. Al-Zubaydi --- Moafaq A. Al-Atalla
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 9 Part (A) Engineering Pages: 1791-1801
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This paper deals with the results of an experimental study carried out on compacted clayey soil, to investigate the strength and consolidation characteristics of this soil. This soil having special case of standard compaction curve contain two values of maximum dry unit weight and two values of optimum moisture content between these point minimum dry unit weight was occurred.The results show that the maximum compressive and tensile strength lies on point near the point of second peak on standard compaction curve. Also the maximum bearing capacity and minimum settlement at the same point on standards compaction curve. Finally the preferred zone to conducted the compaction in field at this point where the dry unit weight at this point was 16.5kN/m3 while the moisture content was 18%.

يتضمن هذا البحث دراسة عملية لإيجاد خصائص كل من المقاومة وخصائص الانضمام لتربة طينية مرصوصة، منحني الرص القياسي لهذه التربة ذو شكل خاص يختلف عما هو مألوف في الترب الطينية، اذ ظهر فيه قيمتين للكثافة الجافة العظمى وقيمتين للمحتوى الرطوبي الأمثل بين هاتين النقطتين توجد نقطة ذات الكثافة الأقل. أظهرت النتائج إن أعلى قيمة لكل من قوة الانضغاط غير المحصور وقوة الشد كانت في نقطة قريبة من النقطة القمة الثانية لمنحني الرص القياسي كما بينت النتائج ان على قابلية تحمل للتربة واقل هبوط يحصل فيها عند نفس النقطة الواقعة على منحني الرص القياســـي.ومن ذلك فان أفضل جزء لرص هذه التربة في الحقل هو في النقطة المذكورة في أعلاه أي عند الكثافة الجافة العظمــى( 16.6 ) والمحتوى الرطوبي الامثل 18%.

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