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Register a new userA Study about the wear layer for some ways to the city of Damascus in terms of adherence to specifications
دراسة طبقة الاهتراء لبعض طرق مدينة دمشق من حيث التقيد بالمواصفات
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Added by
Damascus University ورقة بحثية
Publication date
2009
fields
Civil Engineering
and research's language is
العربية
Created by
Shamra Editor
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يهدف البحث إلى التحقق من التصميم و التنفيذ الجيدين للخلائط البيتومينية لطبقة الاهتراء في بعض طرق و شوارع مدينة دمشق. و قد تبين أن عددًا من الخلائط البيتومينية غير مطابقة للمواصفات القياسية لطبقات الرصف المرن للطرق من حيث التدرج الحبي و ثبات مارشال و نسبة البيتومين و التشوه مما يستدعي ضرورة أن تقوم المؤسسات التي تتعامل مع الطرق بتصميم الخلطات البيتومينية و أن يتم الإشراف على التنفيذ الجيد لها. و تمت مقارنة نتائج الجزرات التي أخذت من بعض طرق و شوارع مدينة دمشق مع نتائج الخلطات البيتومينية المصممة و المنفذة في مخبر جامعة دمشق.
This research is aimed to verify the statement of pavement structural design and construction of bituminous concrete mixture which is used on wearing layers in roads and highways in Damascus city. It's clearly found that many of these bituminous concrete mixtures were far - away from standards and specifications regards to flexible pavements such as aggregate gradations, Marshall Stability, bitumen content and Marshall flow. The role of highway statements authorities who deal with pavement design and supervise the construction is quit necessity. Finally test results of cores taken from several roads in Damascus city were analyzed and compared with the designed mix «original» test results which was done in Damascus University labs.
References used
The Asphalt Institute: Mix design Methods for Asphalt Concrete and other hot-mix types Manual Series No2 (MS-2), 1998
حماد,م.أحمد محمد الموسوعة الهندسية في هندسة الطرق الحضرية و الخلوية الطبعة الأولى الناشر علا للكتب 1999م.
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The main goal of maintaining and repairing equipment and machines during the
investment stages is to reduce the amount of money spent in order to maintain the validity
of their operation and the quality of their reliability under the different give
n investing
conditions (type of manufacturing materials, methods used, temperatures, nature of
investment, …. etc).
This goal can be achieved if we are able to control changes in the technical
conditions of equipment and the frictional parts during the investment stages, besides
knowing the physical laws/rules that govern the technical changes properly. Therefore, we
carried out a study on the theoretical plans of physical wear of brakes and the frictional
parts in means of transportation. This is done starting from wet (oily) wear plans of the
frictional parts in machines. Then, based on these plans we studied physical laws/rules
determining the intensity of dry wear of brakes, along with its speed and acceleration
during the investment and the unreliable, uneconomical (unsafe) operation stages, taking
into consideration the methods used in periodical technical maintenance, ways of driving,
and the average number of times brakes are used…etc .
Based on these formulas obtained, we can estimate/predict the start of ineffectiveness
of brakes and friction linings, in addition to the inception time of risky (unreliable)
operation stage. Consequently, this stage gives us indications for replacement or treating
with the traditional (known) mechanical and chemical ways, in light of the soaring prices
of materials in the Syrian Arab Republic.
The research project sample consisted of 30 blocks of composite resin , these blocks where divided into three equal groups , 10 of composite resin Z-250 from 3M ESPE Company , 10 of the composite resin Supreme from 3M ESPE Company ,10 of the composit
e resin Quixfil of Dentsply company, and has been testing the hardness Number, each sample individually. The aim of the previous procedures was to show the role of composite resin structure in determining the hardness number Through differences in the hardness number and the role of this hardness determining the mechanical properties for composite resin restorations cause of the importance of this property to understand the mechanical properties for a lot of restorative materials. And the result is that there is a statistically significant between the resin Quixfil and the Z-250 on the one hand and the Supreme resin on the other hand.
Extremism in the modernization construction of the world in general and in the Arab
world especially, and move away appearances Imran cities gradually from their original
forms and indifference to the nature of the medium in which you are in it, mo
ve
architectural heritage and ancient cities issue in recent years, we have acquired a great
importance to maintain.
Here are already Vanguards explicit positions recite them interested in inhabitedness
city, ranging from the foundations of the province of the movement of radical sometimes
obscured her face to talk for fear of privacy ideological nationalism of innovators stream
would call for a return to the old attracted of the fear of the loss of part of the Arab-Islamic
architecture of civilization, and the movement of dissolute to the old movement from the
West haphazardly and it describes the ultra-conservative and reactionary intransigence.
And between these and the reaction of moderate considering the successful
experiences of the past we are dealing with creative mind, in search of the spirit of heritage
to create them the achievements of urban living, her last Features civilized authentic spirit
of heritage, based on local ground suitable in the image and The content of the
environment Levantine.
The issue of architectural heritage theme in inhabitedness newly signed Well, it deals
with the architectural achievements of the past in order to spare it harm in continuing
damage to threaten its existence.
Dialogue culture is considered an urgent necessity in the shade of what the Arab
communities witnessed in the last times concerning the spreading of chauvinism and the
refusal of admitting others. Acquiring this culture starts from the family and t
hrough the
dialogue among its members. This will enable those members, in the future, of making a
dialogue with the other and having an openness in dealing with him/her.
Therefore, this current research discusses the culture of familial dialogue. It also
shows the relation of some variables because of the family members' having the skills of
listening and speaking. Two questionnaires were designed to achieve the goals of the
study. One of those questionnaires was directed to the children and the other one was
directed to the parents. Moreover, those questionnaires were applied on a sample of some
families living in a residential quarter in Jableh known as Western Jbeibat. The number of
the families involved in the study was 384. One of the most important results, which were
found, was the weak positive relation between the level of education of the parents with the
family members' having the skills of listening and speaking. This relation is of a statistical
indication. These results also signified the existence of aweak positive relation, which was
of a statistical indication, between the economic level of the family and the members'
having the above-mentioned skills.
Background: Although identification of risks to dental healthcare workers
has been explored in several industrialized nations, very little data is
available from developing countries.
This paper examines the occupational hazards present in the
dental environment and reports survey results concerning attitudes and
activities of a group of Syrian dental care providers.
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