Development of a novel low carbon cementitious two stage layered fibrous concrete with superior impact strength

Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

“…This behavior can be attributed to the same reason discussed for Figures 3 and 4. After crack formation, the impact resistance of the fibrous specimens relies on the tensile strength of fibers and the bond strength between the fibers and concrete, where the fibers dominate the crack opening restricting due to the dowel action that prevent the crack widening [6]. As the repeatedly applied stresses become larger due to the larger impact energy that results from increasing the drop mass, the number of repetition (blows) of these stresses required to break the bond becomes lower.…”

“…FRC is being widely used recently in several types of civil and military structural applications. Examples of these applications are the channel lining, bridge decks, industrial flooring, pavements of airports, offshore and military infrastructures [6,7].…”

“…Khalil et al [19] and Mastali and Davland [20] used the RBDWI test method to evaluate the impact resistance of Self-Compacting Concrete (SCC) containing crumb rubber. Most recently, several researches [2,6,21,22,23] were conducted to evaluate the impact resistance of layered fibrous concrete. In these researches, the course aggregate along with large amount of fibers were firstly mixed and placed in the molds, then after followed by the adding of a flowable cementitious grout that ingress inside the molds by means of gravity and fill voids between the aggregate and fibers.…”

“…Concrete samples were prepared in single or multi layers, with different fiber configurations and contents. Crimped and hooked-end steel fibers with different lengths were used in these mixtures with fiber volumetric contents up to 4, 5 or 6% [2,6,23] or even up to 10% in others [21]. The authors concluded that the proposed layered fibrous sections were of much superior impact resistance compared to normal concrete [2,6,23].…”

“…Crimped and hooked-end steel fibers with different lengths were used in these mixtures with fiber volumetric contents up to 4, 5 or 6% [2,6,23] or even up to 10% in others [21]. The authors concluded that the proposed layered fibrous sections were of much superior impact resistance compared to normal concrete [2,6,23]. They revealed that the impact resistance, in terms of number of blows, of some of these mixtures exceeded 30 times that of normal concrete and was also much superior to that of normal fibrous concrete [21].…”