Evaluating the Behavior of Fiber in Self-Consolidating Concrete

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Evaluating the Behavior of Fiber in Self-Consolidating Concrete

ارائه دهنده: Provider: Mojtaba Goudarzi

اساتید راهنما: Supervisors: Dr. ‎Mahmoud Nili

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr. ‎fereydoon rezaie & Dr Mohammad shooshtari

زمان و تاریخ ارائه: Time and date of presentation: 2021

مکان ارائه: Place of presentation: onile

چکیده: Abstract: The use of self-compacting concrete in a variety of complex structures is increasing. Self-compacting concrete is a new type of concrete that is suitable for special conditions such as rebar congestion. The properties of this type of concrete in terms of passage, performance and non-separation cause it to be spread simultaneously in the formwork, and this feature increases the conflict and strengthens of the connection between the rebar and the concrete. Concrete is weak against tensile strength and does not show good strength, weakness against multiple tensile causes cracks in concrete. Cracking as well as its expansion is one of the most important problems in concrete structures. To solve this problem and resist tensile forces, crack control as well as increasing the energy absorption of fibers are added to the concrete. By adding fibers, especially steel fibers, corrosion resistance, energy absorption, crack control as well as tensile strength increase. Hooked steel fibers are divided according to the type of hooks they have at the end, which as the number of hooks increases, the resistance to stretching and fibers increases too. In this thesis, the effect of 3D, 4D, 5D steel fibers on the properties of soft concrete and self-compacting concrete with and without silica fume is investigated. Tests performed on hooked fibers as well as straight fibers, as well as stress-strain tests and tensile strength tests on samples of self-compacting concrete and concrete containing 10% silica fume with various types of hooked fibers with a volume of 1% steel fibers are considered. experimental results of fiber extrusion are also verified by numerical methods. The results showed that self-compacting concretes in both cases (with and without silica fume) compared to normal concretes have higher tensile strength and energy absorption. Increasing the number of end hooks increases engagement and energy absorption in both types. Silica fume in normal concrete increases engagement and energy absorption. The results show that self-compacting concretes have the highest tensile strength and also increase the tensile strength and energy absorption of self-compacting concretes by increasing the hook

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