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Effects of Moisture, Compaction Temperature and Gradation Types on Durability of Asphalt Concrete Mixtures

تأثير كل من الرطوبة و درجة حرارة الرص و التدرج الحبي على ديمومة الخلطات البيتومينية

1292   1   220   0 ( 0 )
 Publication date 2006
  fields Civil Engineering
and research's language is العربية
 Created by Shamra Editor




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This study is devoted to the durability of bituminous mixtures, including the effects of different gradations, compaction temperatures and immersion time on the durability potential of mixtures.

References used
Improved Asphalt Containing Preclaimed Rubber for Paving Purposes, National center for construction Lab's, Iraq-Bagdad, 1988
Lantcperg U.C, Road Highway and Parking, Moscow, 1983
Serda P., Litvan G., Durability of Building Materials And Components; Proceeding of the first International Conference, ASTM STP 691, National Research counsil of Canada, American Society for Testing and Materials, Philadelphia, Pa. 1978
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The aim of this study is improving the durability of precast products of Glass Fiber Reinforced Concrete (GRC) and in the context of sustainability applications, reduction of cement consumption and replacement of it with green materials. This study has been done to test the role of the natural pozzolan from Shihan Hill in As Suwayda as supplementary cementing material by 10% -15% -20% - 25%, and to determine the effect of it on the consistency and flexure strength over 180 days, as well as to test its role in improving the micro-structure of the mixture by reducing the content of Ca(OH)2 and increasing C-S-H & C-A-S-H gel, which were tested using X-Ray Diffraction (XRD) and Energy Dispersive X-Ray (EDX) techniques, and as a result reduced the erosion of fibers as shown in images by Scanning Electronic Electron Microscopy (SEM). Moreover the role of pozzolana has been studied in controlling the degradation of the material over time which tested by immersion in hot water 50° for 150 days and by drying – wetting cycles. Also the effect of pozzolana on absorption, porosity and resistance of sulfates attacks was studied. The results have shown that the used natural pozzolana has no negative effect on consistency or mechanical properties, and it improved all the studied durability factors.
يشكل الرصف المرن (Flexible Pavement) النوع الأكثر انتشاراً في انشاء الطرق في الجمهورية العربية السورية كما أنه يستخدم بشكل واسع في كافة مناطق العالم حيث تبلغ نسبة الطرق التي تعتمد في انشائها على هذا النوع من الرصف حوالي 93% في الولايات المتحدة الأمري كية ويعود ذلك الى سهولة وسرعة انشائه وصيانته . وهذا الانتشار الكبير للرصف يتطلب وضع منهجية للعمل في تصميم الخلطات الاسفلتية بحيث تحقق المتطلبات الفنية المتبعة في تنفيذ الطرق قادرة على مقاومة اجهادات التعب وحمولات المرور والعوامل الجوية . وفي بحثنا هذا قدمنا شرحا مفصلا عن مكونات الخلطة الاسفلتية وطريقة تصميم الخلطات الاسفلتية وفق خلطة مارشال . حيث قدمنا في الفصل الأول دراسة مفصلة عن الروابط البيتومينية وأنواعها وتصنيفها . أما في الفصل الثاني دراسة الخواص العامة للخلائط الحصوية المستخدمة في الطرق والتجارب التي تجري عليها وطرق دمجها . أما في الفصل الثالث والرابع تحدثنا عن مفهوم فلسفة الخلائط البيتومينية ومراحل تصميمها . وفي الفصل الخامس والفصل السادس ناقشنا الأسس النظرية لتصميم الخلطة الاسفلتية وفق طريقة مارشال . أما في الفصل الأخير تم تصميم خلطة اسفلتية تمثل المراحل التطبيقية لتصميم الخلطة الاسفلتية وجميع التجارب المنفذة على مكونات هذه الخلطة .
Compacting hot mixes asphalt (HMA) at low temperatures or mixing it in the asphalt at high temperatures is a constant source of concern to researchers, as compacting and mixing at non-ideal temperatures leads to adverse results, which negatively affect the properties of asphalt concrete and lead to problems paving.
The study has shown that the apparent bulk density of soil increases with the increase of compression and moisture during press. The maximum rate of increase in depth was 0 – 20 cm that amounted 0.38g/cm3 at compression by 257.44-kilopascal and moi sture average at compression by 19.03% (equal to 60% of the field capacity average of the soil) in comparison with the non-existence of compression. In addition, the size of the pores bigger than 50 microns decreased at the same above compression and above moisture in depth of zero – 20 cm by 20.20%. The size of pores bigger than 10 microns decreased by 20.65% in comparison with the non-existence of compression. While it was noted that the the maximum loss of root yield that amounted 17.52%, at compression by 257.44 kilopascal, and moisture 19.03%.
This research aims to decrease the cost of last production stages through decreasing the cost of potential casing repair by avoiding the problems that casing string may be exposed to. Such problems are caused by the temperature effect of salt dril ling fluids as well as other fluids normally existed in the annular behind casing at the nonecemented intervals.
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