Effect of Steel Fiber on Ultrasonic Pulse Velocity and Mechanical Properties of Self-Compact Light Weight Concrete

Abstract

In this research, an attempt has been made to study the velocity of ultra-sonic pulse Velocity (UPV) transmitted through self-compacting lightweight concrete (SCLC) with and without steel fiber (SF) for different specimen lengths (i.e. 100 mm cubes and 200 mm cylinders). Two volume fractions of SF “0.4%” and “0.8%”(as an indication to steel fiber content (SFC) were also studied to explore their contributor role. It was found that, for the (100 mm) cubic specimens and the (200 mm) cylindrical specimens, the UPV increment with increasing SFC, but the percentage of increase is higher in cylinders than in cubes. It was also found that, for the same SF volume fraction, the UPV in the SCLC, increases with the decreasing of specimen length, from (200 mm) cylinders to (100 mm) cubes. The percentage of this increase decreases with the increment of SFC. The influence of SF on three mechanical properties of the SCLC (namely: the compressive strength, the splitting tensile strength, and the bulk density) was also studied. It was found that the three mentioned properties are enhanced with the increment of SFC, but this increase is moderately in compressive strength, extremely in tensile strength, and slightly in bulk density.

The influence of chopped copper fibre (CF) on the improvement of pure gypsum by compressive strength

“…Regarding the use of strengthening substances, a good deal of research demonstrates the relevance of including various fibres in gypsum mixtures [3,[18][19][20][21][22][23]. This is because the fibres increase the gypsum tensile strength and shape stability to support the mixture to reduce degradation and breakdown.Many researchers have studied the effect of even more substances such as steel fibre or chipped carbon fibres to reinforce a concrete mix, cement mortar, and asphalt concrete admixtures [24][25][26][27][28][29][30][31][32].The current work proposes to design Pure Gypsum (PG) of unique fibres that strengthen as a composite form by use of compact and ductile copper fibres haphazardly scattered in the gypsum. Copper fibres present high ductility [33] to improve problematic brittle material fractures to become ductile fractures and also block the tendency to pull-out from the gypsum.…”

Assessment of the Effect of Replacing Normal Aggregate by Porcelinite on the Behaviour of Layered Steel Fibrous Self-Compacting Reinforced Concrete Slabs under Uniform Load

“…Lightweight concretes have a lower elastic modulus, larger creep, and more brittleness than normal-weight concrete [1]. Several investigators [1,[8][9][10][11][12] have used steel fiber to reinforce concrete. Others have used steel fiber to reinforce light-weight concrete [2-5, 10, 11, 13-15].…”

“…Others have used steel fiber to reinforce light-weight concrete [2-5, 10, 11, 13-15]. e rest of them have used self-compacting concrete in their researches, [2,3,10,11,16,17]. Al-Ridha [10] has studied the effect of lightweight aggregate size on the mechanical properties of self-compacting concrete with and without steel fibers.…”

“…Al-Ridha [10] has studied the effect of lightweight aggregate size on the mechanical properties of self-compacting concrete with and without steel fibers. ey have also studied the influence of steel fibers on the velocity of ultrasonic pulse of self-compacting lightweight concrete [11].…”

Velocidade de Propagação de Onda Ultrassônica em Concretos com Fibras

“…Ridha et al, 2017; Shiade e Tavakoli, 2018) e leves(Al-Ridha et al, 2017) foram os tipos ensaiados pelos autores encontrados na literatura, cujos valores médios de resistência à compressão das vigas situaram-se entre 19 MPa e 112 MPa. -Características dos corpos de prova de concretos com fibras de outros autores…”