Özet:

The size effect is an important application of the breaking mechanics of concrete. Most of the work was done using samples that give a single-axis stretching status. But the widely used concrete structures such as flooring, lifting and concrete path are often exposed to multi-axis stretching conditions. Therefore, the determination of the multi-axis drawing resistance of building materials plays an important role in the design of the building elements. This study aims to determine the size effect on the pull resistance of steel fiber concrete in two-axis curvation using the triangular plate method. For this purpose, the water cement ratio of 0.42 and the sample thickness/quarity (t/r) ratio is fixed, with different sizes of steel fiber samples are prepared. The mixture has a volume of 1% of the two-end stainless steel fiber, which is produced in a total of 15 triangular plate patterns of 5 different sizes. The samples produced were tested in standard conditions for 28 days. Triangular plaque tests were conducted on the scattered samples. The data obtained from the experiments have been analysed by the size effect and the size effect curves have been drawn. As a result, when the thickness of the triangular plate samples (t) increased, the breaking loads increased and the stretches decreased. The triangular plate method has been concluded that it can be used as an alternative experimental management to determine the size effect on the two-way drawing resistance of steel-fiber concrete and the breakdown behavior.

Anahtar Kelimeler:

Özet:

The size effect is an important application of concrete fracture mechanics. Therefore, many studies have been done on determining the size effect on concrete structures in recent years, most of which have been carried out by using specimens under uniaxial tensile stress. However, many reinforced concrete structures, such as slabs, pavements and concrete roads concrete are subjected to biaxial tension. Therefore, determining tensile strength of concrete is crucial to better design of the concrete structures. In this study, the size effect on the tensile strengths of mortar mixtures is investigated. The triangular plate method is used to find the size effect on the tensile strength of the mortar mixture. For this purpose, the mortar mixture specimens containing steel fibers that have 0.42 water-cement (w/c) ratio with various sizes in triangular form are prepared and analyzed. A total of 15 specimens triangular plate with 5 different sizes that contains 1% steel fibers in volume are prepared while the thickness/median (t/r) ratio is kept constant. Triangular plate tests are conducted on the specimens cured in standard conditions for 28 days. The size effect curves, which are obtained from the analyses, showed that an increase in the thickness of the plate samples (t) results in increases the collapse loading and therefore, decreases stresess. Therefore, it can be concluded that the triangular plates testing method can be used as an alternative test to determine the size effect on the tensile strength and fracture behavior of the fibrous mortar mixture.