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Register a new userEffect of addition steel fiber abstracted from recycled tires upon the concrete compressive strength
تأثير إضافة الألياف الفولاذية المستخرجة من إطارات السيارات المستهلكة على مقاومة الضغط للخرسانة
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حاليا يتم اسهتلاك مئات الأطنان من الإطارات سنويا مما يستدعي التخلص بكفاءة من هذه الكميات من الإطارات المستهلكة و تطوير وسائل لتحويلها الى مواد مفيدة. في سورية فقط تقدر كمية الأسلاك الناتجة من الإطارات سنويا بحوالي6000 طناً. يتناول هذا البحث تأثير اضافة الألياف الفولاذية المستخرجة من الإطارات المستهلكة للسيارات على مقاومة الضغط للخرسانة. تم تحضير عينات لثلاثة خلطات من الخرسانة بعيارات اسمنت 300-350-400 كغ/م3 و أضيفت الألياف الفولاذية بقطر 0.8 مم بنسب حجمية تساوي 0.5 - 1 - 1.5% و بأطوال 30 - 40 - 60 مم بالاضافة الى عينات مرجعية بدون الياف. بينت النتائج تحسنا في سلوك الخرسانة على المتانه و سلوك البيتون في مرحلة مابعد التشقق بالإضافة الى زيادة في مقاومتها على الضغط مما يمكن من استعمالها في تطبيقات هندسية عديدة مثل رصف المهابط في المطارات و أرضيات المعامل و المنشآت المائية نظرا لمقاومة هذه الخرسانة للتآكل بسبب جريان الماء و غير ها من التطبيقات.
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 diameter 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.
References used
ACI Committee 544, Design Considerations for Steel Fiber Reinforced Concrete, ACI 544.4R-88
ACI Committee 544, State-of-The-Art Report on Fiber Reinforced Concrete, ACI 544 1.R-96
AIELLO; LEONE :steel fibers from waste tires as reinforcement in concrete:a mechanical characterization. department of innovation engineering, university ofsalento, via monteroni, 73100, lecce, italy
BANTHIA & TROTTIER. Test Methods for Flexural Toughness Characterization of Fiber Reinforced Concrete: Some Concerns and a Proposition no. ACI Materials Journal, V. 92 No. 1, January-February 1995.p.1-10
BENCARDINO, F., RIZZUTI, L., SPADEA, G. Experimental tests vs. theoretical modeling for FRC in compression. In Proc. 6th Int. Conf. on Fracture Mechanics of Concrete and Concrete Structures - FraMCoS-6, Catania, Italy, 2007
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This research presents an experimental study about the effect of steel fibers on the
main variables of stress- strain curve for high strength concrete on simple compression,
which are: shape of stress- strain curve, ductility factor, energy absorpt
ion capacity. For
this purpose, series of cylinders concrete specimens were prepared in compressive strength
(70 MPa). the steel fiber with aspect ratio of L/D =70 were added at the volume fractions
of (0-1-1.5-2)%. The cylinders were tested under a monotonic loading at compression, and
as a result of the tests, the total curve of stress- strain was obtained. The experimental
results of research showed a positive effect of steel fibers on the behavior of high strength
concrete, this effect increased with increasing volume fraction of steel fibers. It can be seen
from stress-strain curve, whereas the slope of the ascending branch is not much affected.
The descending branch of the stress- strain curve decreases by the increase in the fiber
volume fraction. This means the ductility and toughness improve with the addition of steel
fibers and as a result the behavior of high strength concrete has gone far away from being
brittle as it is used to be.
Thepaper studies the mechanical properties ofsteel fibers reinforced lightweight
concrete.This kind of concrete is produced by usingscoria aggregateswhich can be found
abundantly in Syria. Thelightweight concrete mixeswere designed for three differ
ent
percentage of steel fibers (0, 0.5, 0.75)%.
Different tests were performed to determine mechanical properties of product
concrete such as compressive strength, elasticity modulus, splitting tensile strengthand
flexural strengthalso; the stress–strain diagram of produced lightweight concrete was
established under compression.
The results showedanincrease of the compressive, splitting tensile and flexural
strengths reach up 16.9%, 25.6%, and 53.6% respectivelywhen the steel fibers were used.
Also the results indicated the importance of using the steel fibers to improve the
performance of concrete and change its brittle behavior to ductile behavior.
the purpose of this research was to concentrate on this subject, where
four types of concrete mixes of the same shape were prepared (Abrams
settlement about 20 cm), but the cement content and compression strength
in each mixture were different, al
l samples were exposed to destructive acid
effect (nitric acid, sulphuric acid ) of a ratio 3% and PH ≤ 4.
This research studies the effect of the addition of polypropylene
fibers (PF) on the properties of the swelling clayey soil. The effect
of PF on the shear strength of the clayey soil has been studied
and the results show that adding PF, up to spec
ific value,
increases the shear strength. Beyond this value of addition, the
shear strength decreases. The increase in shear strength was
about (100-110) % and the optimal addition ratio was determined.
This paper presents the shear behavior of lightweight concrete beams
without shear reinforcement produced by scoria aggregates. A total of nine
beams were tested under four-point loads, including three lightweight
concrete beams without steel fibers and six steel fiber reinforced
lightweight concrete beams.
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