High performance macro synthetic fiber reinforced concrete

Öztürk, Çağrı
Since concrete is a brittle construction material, it has the tendency to fail in a brittle manner after the occurance of the first crack when it is subjected to a certain amount of load. Therefore, this property of concrete makes almost impossible for it to be used in load carrying structural elements without reinforcement. This reinforcement is usually utilized by a structural steel reinforcement such as rebar and wire mesh. The structural steel reinforcements compensate the low resistance against the tensile strength of the plain concrete by taking over the tensile stresses under different loading conditions. Nowadays, in addition to steel reinforcement randomly dispersed small sized fibers can also be utilized to improve the mechanical properties such as toughness of concrete. The aim of this study is to determine the toughness of high performance macrosynthetic fibers. In order to obtain high performance, fiber dosages up to 2.7% was utilized with a highly viscous matrix. The toughness parameters were investigated by two different panel test methods which are; i) ASTM C1550: Standard Test Method for Flexural Toughness of Fiber Reinforced Concrete, and ii) EFNARC Square Panel Test Method. As a result of the thesis study, it was found out that, with increasing fiber dosage, the energy absorption capacity of concrete improved significantly. Moreover, based on the energy absorption capacities obtained from the round and square specimens, an equation with good reliability was derived to describe the relation between the two test methods.


Effect of specimen size, fiber type and concrete strength on the flexural performance of fiber reinforced concrete
Güzelce, Aydinç; Yaman, İsmail Özgür; Department of Civil Engineering (2019)
To overcome the brittleness of concrete, fiber reinforcement is a commonly used material, which highly increases the toughness of concrete in a cost-effective way. The aim of this study is to assess the effect of different fiber parameters on the flexural behavior of fiber reinforced concrete. Bending tests were performed on two different beam sizes made of 20 different concrete batches. The type and amount of the fibers along with the grade of the concrete were changed to form this batch combination. The f...
Effect of test methods on the performance of fiber reinforced concrete with different dosages and matrices
Hetemoğlu, Yalçın Oğuz; Yaman, İsmail Özgür; Department of Civil Engineering (2018)
Through the last few decades, the idea of adding fibers in to concrete has been quite improved, considering the significant contribution of fibers to the mechanical properties of concrete such as tensile strength, energy absorption capacity and ductility. As a result of many intensive research Fiber Reinforced Concrete (FRC) has become a high-tech material that ensures great performance yet needs efficient design and application. However, the lack of a universally accepted approach and standardized test met...
A Computer vision based method for semi-automated rebar detection and measurement of reinforced concrete columns /
Hassan, Muhammad Usman; Kurç, Özgür; Department of Civil Engineering (2014)
As-built information of reinforced sections is necessary to ascertain structural characteristics from load carrying capacity, serviceability, structural integrity and adherence to code perspective. The objective of this research is to develop a semi-automated structural information acquisition method that can be used to determine as-built information regarding rebar grids of reinforced concrete columns. The technique involves application of photogrammetry, image processing and computer vision knowledge to o...
Effect of fiber type and concrete strength on the energy absorption capacity of fiber reinforced concrete plates under quasi-static bending
Mercan, Ali Macit; Yaman, İsmail Özgür; Department of Civil Engineering (2019)
With all the known solid advantages of concrete, it has also limitations in its mechanical properties, such as low ductility, tensile strength and energy absorption capacity/toughness. In order to eliminate or minimize these limitations, some developments have been worked up by introducing natural or artificial fibers into the concrete mixture. The main scope of this thesis is to observe the effect of different fiber types and dosages on the performance of two different concrete grades. Two steel fibers wit...
High performance structural lightweight concrete utilizing natural perlite aggregate and perlite powder
Eser, Hasan; Turanlı, Lütfullah; Department of Civil Engineering (2014)
Structural Lightweight Concrete is generally made by using artificial lightweight aggregates such as expanded clay, shale and slate. However, rapidly increasing fuel prices in recent decades and corresponding increase in the production costs of these aggregates have renewed the interest in natural lightweight aggregates such as pumice, scoria, rhyolite and perlite. This study investigates the mechanical properties and durability characteristics of high-performance lightweight concretes utilizing natural per...
Citation Formats
Ç. Öztürk, “High performance macro synthetic fiber reinforced concrete,” M.S. - Master of Science, Middle East Technical University, 2018.