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Register a new userدراسة تباین قراءات المقاومات للخرسانة في الاختبارات اللاتخریبية
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Tishreen University ورقة بحثية
Publication date
2000
fields
Civil Engineering
and research's language is
العربية
Authors
أسامة ميرو( باحث )
Created by
Shamra Editor
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مازالت طرائق اختبار المقاومات للخرسانة بالطرق اللاتخريبية تعدُّ طرقاً غير مباشرة. و نظراً لعدم وجود مفهوم واضح و عام و ثابت لمقاومة الخرسانة فإن طريقة العينات الأسطوانية أو المكعبية تعد أيضاً طريقة غير مباشرة لقياس المقاومة الهندسية، و انطلاقاً من ذلك يتخصص هذا العمل كمحاولة علمية تجريبية جادة لتطوير العلاقات الحسابية للحصول على أدنى و أصغر خطأ ممكن للقراءات باختبار المطرقة الخرسانية الارتدادية مع مقارنة حقيقية واقعية لمقاومات الخرسانة ذاتها من خلال اختبار عينات خرسانية مكعبية من منشآت منفذة و مراقبة من قبلنا و بشكل موازٍ.
No English abstract
References used
Bothtovic, g, filonidov. A. Vaslavski. V. Obridilenie Adnarodnostu bitona spomoshyo ultrazvoka, Energetitshsk. Struitelstva. NS 1968
Klevtsov. V. A. Statistitshskaia Atsenka Protshnosti betona pri ispitanie Nirazrushioshimi metodami ll sb. Niijb «isledovanie vlianie Katshistua izgatovlenia, montaja uiksplutatsi construktsi Na ish Nisushuio spasopnast. Moscow – 1980
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بين أیدینا هنا ثلاثة مختارات لمؤلفات حدیثة سنعرض لكل منها بغرض إظهار المنهجية التي تم اتباعها
في محاولة منا لمعرفة أهداف هذه المؤلفات, و لإسقاط الضوء على الظاهر (المعلن) و الباطن (غير المعلن) في كل منها.
Washback and commutative testing possess direct impact on the
outcome quality of education. They have, therefore, been looked at
thoughtfully by specialists in the field of testing, measurement and
assessment in the last decade. The Arabic library
, however, lacks
materials on those two themes, which was the objective behind
publishing this paper in one of Arabic periodicals, with the goal to draw
the attention of stakeholders and policy makers to the influence of
washback and commutative testing possess on the curriculum. The
methodology of the current paper tends to focus on applied perspectives
with simplicity and illustration of models and examples.
Exam ) objective tests) have an important role in the evaluation of student's intended
learning outcomes, and estimates the level of their meeting of the sought goals. Therefore,
the skill of formulating exam tests is one of the main criteria that
should be within criteria
of the evaluation quality. An objective test is one of the sorts that offers a student with a
number of answers to a question or solutions to a problem, and then the student should
identify (recognize) the right answer or solution to these questions. They are called
"Objective Tests" because they are objectively corrected, in other meaning, its correction
doesn't differ from one evaluator to another. Because the importance of formulating this
type of questions and scarcity of researches concerned this idea. This research aimed to
evaluate the achievement of the formulated objective tests for formulated objective test
conditions. The taken research sample was the final written exam (second term) which
represented the courses of the four years that are taught by faculty staff members at
Nursing Faculty for the academic year 2014 -2015. The sample was consisted of 719
multiple-choice question, 248 True/False item, and 21 Match item. The most significant
findings were: the faculty members followed the conditions of formulating stem in
multiple-choice questions with the need to pay attention to language clarity and accuracy.
In addition, they followed the conditions in formulating alternatives in multiple-choice
tests, and follow all test-type formulation conditions for True/False items, with relying
heavily on multiple-choice questions and True/False items, while relying on the test of
match items (proportionality) type was very few.
In this article we present a new and effective method to Estimate the static fatigue age for
springs, when it works by static load or static strain for a long time at deferent
temperature, this case is very important because the spring is a battery
for force and it must
save allow value of the force.
At the first we present a theory study for “creep and relaxation “and how we can accelerate
the test to get the results, then we suggest method to accelerate the test to know when the
spring retch to the minimum allowable value of the force at work temperature degree, this
method depend on tests at samples at deferent temperature degrees, higher than work and
storage temperature, and then use the results to estimate the static fatigue age for springs at
real storage and work temperature.
Recently worldwide researches have been devoted to the use of steel fibers recovered from used tires in concrete. In Syria the amount of recovered steel from used tires is estimated about 6000 tons/year.
For this purpose a bead wire having a diamete
r of 0.8 mm from burnt tires was extracted and used. Three mixes with cement content 300- 350 -400kg/m3 were produced incorporating three different volumes of fiber 0.5%, 1.0%, and 1.5% and three different length 30-40-60 mm. The concrete obtained by adding these fibers evidenced a satisfactory improvement of the fragile matrix mostly in terms of toughness and post cracking behavior On the other hand it was improvements in compressive strength by steel fiber inclusion the interesting results confirm the promising application of concrete reinforced with steel fibers extracted from used tires in aircraft pavement hydraulic structures and ground slab in fabrics.
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