High performance fiber reinforced concrete for the shear reinforcement: Experimental and numerical research

Abstract

h i g h l i g h t sAn innovative mix design method is proposed for the development of HPFRC. The behavior of HPFRC is characterized under compressive, flexural and shear loading. The influence of fiber distribution and orientation on HPFRC's properties was assessed. A constitutive model for the HPFRC is assessed by experimental and numerical simulation. a b s t r a c tHigh performance fiber reinforced concrete (HPFRC) is developing rapidly to a modern structural material with unique rheological and mechanical characteristics. Despite applying several methodologies to achieve self-compacting requirements, some doubts still remain regarding the most convenient strategy for developing a HPFRC. In the present study, an innovative mix design method is proposed for the development of high-performance concrete reinforced with a relatively high dosage of steel fibers. The material properties of the developed concrete are assessed, and the concrete structural behavior is characterized under compressive, flexural and shear loading. This study better clarifies the significant contribution of fibers for shear resistance of concrete elements.This paper further discusses a FEM-based simulation, aiming to address the possibility of calibrating the constitutive model parameters related to fracture modes I and II.

Time dependent behaviour of fibre pull-out in self-compacting concrete

“…GPa with CoV of 0.26 %. The strength class of the SFRSCC was selected in order to achieve a post-cracking flexural performance required for its use on elevated SFRC slabs (supported on columns) in terms of flexural and punching capacity [20][21][22].…”

“…where, 21 tt SR  is the slip rate between time t2 and t1, ti lt s represents the long-term slip at time ti, C ti  is creep coefficient at time ti and inst s is the instantaneous slip at loading application (Fig. 6).…”

Deflection and cracking behavior of SFRSCC beams reinforced with hybrid prestressed GFRP and steel reinforcements

“…The SFRSCC used in the present experimental program was prepared based on the mix method developed by Soltanzadeh et al [23]. The used materials were cement (CEM II 52.5R), fly ash class F, limestone filler, superplasticizer (Glenium SKY 617, is a second generation of superplasticizer based on polycarboxylate ether (PCE)), water, three types of aggregates (containing fine and coarse river sand, and crushed granite) and hooked end steel fibers of 33 mm in length, aspect ratio of 65 and yield stress of 1100 MPa.…”

“…To better mobilize the relatively high tensile capacity of GFRP bars, they are placed near to the outer beam's tensile surface, while the steel reinforcement (as a material susceptible to corrosion) is placed with higher FRC cover to assure higher protection against corrosion. In addition to these characteristics, the following strategies are considered in order to increase as much as possible the structural performance: -I-shaped cross section is proposed for such beam structure in order to have an optimized flexural performance, and take the benefit of having a higher flexural stiffness of section comparing to the rectangular cross sectional beam for the same volume of FRC material; -Utilizing a SFRSCC with a post-cracking tensile capacity enough to avoid the use of steel stirrups, since they are the reinforcement elements more prone to corrosion [23]. This is more beneficial when I-shaped cross sectional beam is used, due to the shape of the cross section itself, and due to the difficulty of installing stirrups in relatively thin beam's web;…”

Using hooked-end fibres on high performance steel fibre reinforced concrete

“…Also high performance concrete (HPC) is a concrete mixture, which provides high strength and high durability when compared to conventional concrete. HPC is an economical solution for many structural cases to provide adequate durability and is particularly advantageous in compression elements [1,[3][4][5]. Concrete has some disadvantages like low tensile strength, low ductility and low toughness.…”