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Register a new userThe modelling of recycled pavements using foamed bitumen
نمذجة طبقات الرصف المعاد تأهيلها باستخدام البيتومين الرغوي
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Aِl-Baath University ورقة بحثية
Publication date
2017
fields
Transportation
and research's language is
العربية
Created by
Shamra Editor
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يتناول البحث طريقة إعادة التأهيل بإضافة البيتومين الرغوي و هي أحد الطرق الحديثة نسبيا في هذا المجال و لم يتم استخدامها في سورية بعد بسبب عدم توافر التجهيزات المخبرية اللازمة لتقييم أداء طبقات الرصف المعاد تأهيلها، فكان هدف البحث تطوير نموذج رياضي لمحاكاة التجارب اللازمة لتقييم الأداء لعينات مثبتة بالبيتومين الرغوي من تحديد تشوه سطحي و نسبي ، و تم ذلك باستخدام طريقة العناصر المحدودة باستخدام برنامج النمذجة المعروف ABAQUS.
The research discusses roads rehabilitation using foamed bitumen,which is a relatively new method and hasn’t been used in Syria yet due to the lack of the needed labrotory equipments ,and that’s why the main aim of the research is to develop a model to stimulate the labrotory experiments needed to evaluate the performance of the rehabilitated pavement (surface deflection – strain ). The model was developed using the finite elements method with the help of ABAQUS modelling software.
References used
Kim Jonathan , September 2000 ,Mix design consideration for cold and half-warm bituminous mixes with emphasis on foamed bitumen
CSIR transportek South Africa , 1998,foamed asphalt mixes ,mix design procedure
John Figueroa (RTA) , Graham Hennessy (Boral Asphalt) and Rob Hiley (Sasol Wax) ,2007,Early experience with the use of warm mix asphalt technology in NSW
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The large increase in the volume of demolition concrete waste and its impact on the
environment has led to reconsider of using concrete demolition rubble as a partial or a
whole alternative of natural aggregates to produce new concrete which has th
e required
properties to use in engineering constructions[1]. With the possibility of improving the
mechanical properties of this concrete by processing this aggregates before using it or
support this concrete with fiber to improve its structural behavior.
This research deals with the study of the replacement the natural aggregates used in
concrete with recycled concrete aggregates resulting from the demolition rubble ,
according to different replacement ratiosranging between 0 % -25 % -50 % -75 % -100%
and the impact on the concrete behavior with a natural aggregates and determine the
optimal replacementpercentage.
The results showed a relative decrease in the concrete resistance on the simple
pressure , limited decrease in the volumetric mass also, and a slight adjustment to the
behavior of concrete under the loading effect by increasing the replacement proportion of
the natural aggregateswith recycled concrete aggregates..
Manufacturing processes are the main source of waste materials, however the increasing awareness about the environment has tremendously contributed to the concerns related with disposal of the generated wastes. Solid waste management is one of the ma
jor environmental concerns in the world. With the scarcity of space for land filling and due to its ever increasing cost, waste utilization has become an attractive alternative to disposal.
Research is being carried out on the utilization of waste products in concrete. Such waste products include discarded tires, plastic, glass, and coal combustion by-product. This paper presents a detailed review about recycled plastics (polyethylene), as aggregates to cement mortar by replace equivalent weight of sand by plastic in regular specimen and watch its effect on the property of mortar include compressive strength, splitting tensile
strength, absorption and heating effect. It is clear that compressive strength, splitting tensile strength decreased with increase in plastic content but this property increases by exposing samples to high temperatures.
This research was performed to improve the quality of Bituminous mixes, and improve the thermal resistance of the surface bituminous layer, the bitumen has a various changes, that which begins from the production of the bituminous mixture in high tem
peratures, these changes continues to the phase of it's use. For this purpose, SBS(Styrene Butadien Styrene) was selected to be an improving material to bitumen according to the rate: 3.5% for SBS.in my research I work on modifying the local bitumen by adding the SBS so that the modified bitumen can be used to design bituminous mixes within the limits of bituminous mixes designed specifications, and improve it's thermal resistance. some experiments were held to determine the qualities of the modified and unmodified bitumen,befor and after Lose Of Heating, the results were within the specifications 'limits. According to Marshal's method, samples of Bituminous mixes were prepared for all Bituminous sorts used in our research. These samples were put under required tests, and samples were prepared according to an ideal rate of Bitumen. the result was the Bitumen modified by adding SBS improve the quality of Bitumen to thermal resistance.
This research was done to improve the local bitumen specifications 60-70 (Banias
refinery output) using Cement Bypass DUST(CBPD) so that it becomes more resistant to
high temperatures (Short- Term- Aging), in addition to reduce the harmful waste ma
terials.
The cement bypass was supplied by Tartous Cement Company and added to
bitumen with different percentages namely, 12%, 14%, 16% and 18% (by the weight of
bitumen). some experiments were held to determine the properties of modified and
unmodified bitumen (Penetration )25, 15, 4(∁°- Ductility- Softening point), then We
returned previous experiences after (Loss- on- heating test) and exposure to (Short- Term-
Aging) on the modified and unmodified bitumen, and the results were within specification
limits, were Compatible with previous reference studies and these additions have to
improve the resistance of bitumen to high temperatures. The optimum cement Bypass Dust
ratio was found to be 14% of the weight used bitumen.
foamed concrete is a concrete made by cement slurry mixed with foaming agent, so
that foamed concrete is lighter than conventional concrete. The objectives of this study is
to produce this kind of concrete, and to study some of its physical and mec
hanical
properties. Mix design of concrete was made for four required densities (1000,
1300,1600,1900 kg/m3), cement content of 350 kg/ m3, and water to cement ratio equal to
0.5. Different tests were performed to determine some properties of product concrete such
as density, compressive strength and splitting tensile strength. The results demonstrated the
possibility of production foamed concrete with wide range of density and strength. The
oven dry density of foamed concrete was in the range of (870-1773 kg/m3) , compressive
strength was in the range of (2.95-16.2 Mpa ), and the splitting strength was in the range
of (0.32-1.76Mpa).
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