Experimental investigation on flexural toughness of hybrid fiber reinforced concrete (HFRC) containing metakaolin and pumice

Use of polymer fibres recovered from waste car timing belts in high performance concrete

“…For compressive strength tests, concrete cubes of 100 Â 100 Â 100 mm were cast, and prismatic specimens of 100 Â 100 Â 500 mm [16,17] were prepared from the same batch to conduct flexural tests. For each mix design nine cubic and three prismatic specimens were tested.…”

Mechanical and durability properties of high-strength concrete containing steel and polypropylene fibers

“…However, concrete is a quasi-brittle material, and its brittleness increases with its strength. Relatively low tensile strength and poor resistance to crack opening and propagation are the main disadvantages of conventional concrete [1][2][3][4].…”

“…Additionally, it is well understood that the use of supplementary cementitious materials such as silica fume (SF), ground granulated blast-furnace slag (GGBS), and fly ash (FA) as part of binders is required for production of high strength concretes [9,10]. Generally, replacement of ordinary Portland cement (OPC) by pozzolans in concrete can decrease porosity of concrete, especially in the long-term [1]. On the other hand, mineral admixtures such as silica fume also increase the brittleness of concrete [11].…”

Effect of Steel Fiber and Different Environments on Flexural Behavior of Reinforced Concrete Beams

“…Moreover, a serious deficiency may exist in the transition zone of FRC. Especially in the earlier ages, there is a thick and weak transition zone with a lot of porosity between steel fibers and the paste, which can lead to a decrease in the flexural capacity [25]. However, with increasing the age, decreasing the porosity, and consolidating the transition zone, the role of steel fibers on the enhancement of Pmax(Pr-RC) and T(Pr-RC) will be increased.…”