High‐velocity impact experiment of concrete panels reinforced with crimped wire mesh and steel fibers

Abstract

This experimental research aims to evaluate the impact resistance of the crimped wire mesh‐ and steel fiber‐reinforced concrete panels that receive the impact load of the high‐velocity projectile. The concrete panel's impact resistance was evaluated by using variables such as the steel fiber volume fraction, presence of crimped wire‐mesh reinforcement, thickness of panel, impact velocity, and the size of aggregates. The impact resistance was evaluated by using the nondimensional impact factor where various variables could be integrated. Although the improvement of the impact resistance particularly regarding its penetration depth caused by the steel fiber mix was insufficient, there was a visible effect of improvement in impact resistance for scabbing and perforation. This occurred as the steel fiber had a bridging effect within the concrete matrix. Moreover, when reinforced with crimped wire mesh, the area loss of the front and rare face decreased. While it was effective for perforation and scabbing, it was insufficient for improving the resistance of penetration. Meanwhile, there were some cases where a splitting bond failure occurred along the cover of the rear face in a few specimens. The outcomes suggest that if steel fibers are mixed with the wire mesh‐reinforced concrete panels, this, in turn, increases the splitting bond strength based on a bridging effect, thereby preventing a splitting bond failure.

Experimental study, modeling, and reliability analysis of impact resistance of micro steel fiber‐reinforced concrete modified with nano silica

“…where N is the number of blows, F 0 is defined as the probability failure, z is the scale factor, and τ is the shape factor. Therefore, the design survival probability (μ) can be determine using Equation (14).…”

“…The impact resistance is regarded as one of the critical concrete properties for applications in civil engineering Zhang et al 10 Numerous studies revealed that randomly dispersed steel fibers (SFs) could remarkably improve the concrete mechanical properties, toughness, impact resistance, post crack behavior, and fatigue properties. [11][12][13][14][15][16] For instance, Zhao et al 17 studied the combined effect of steel slag and hooked-end SFs on the fresh and mechanical properties of self-compacting concrete. Matalkah et al 18 investigate the effect of fiber type and dosage on the mechanical and shrinkage properties of alkali-activated kaolin binder.…”

Behavior of High-Strength and Ultrahigh-Performance Concrete Targets Subjected to Relatively Rigid Projectile Impact

“…However, UHPC test targets having a design compressive strength of 150 MPa were developed using laboratory mix proportions without coarse aggregates and were steam cured. Because it is not known whether the effect of steel fibers on concrete penetration resistance is insignificant (Kim et al 2017(Kim et al , 2018, steel fiber having a volume of 1.5% was also used. High-strength concrete for the 80-120 MPa test targets was designed such that compressive strength would develop after 120 days without steam curing.…”

Development of Energy-Based Impact Formula-Part II: Scabbing Depth, Scabbing Limit, and Perforation Limit

“…The scabbing theory was introduced to derive the scabbing-resistant energy. According to this theory [8,26], compressive stress is generated and radiated from the force induced at the impact point on the front face, P, in Figure 3, and is transferred to the rear face of the panel. The transferred stress is transformed into tensile stress, assuming that the tensile stress is generated and reflected at the free point (P ), as shown in Figure 3.…”

“…Concrete or concrete-steel composite plate members are often exposed to high strain-rate loading, such as blasts and impacts [5], and there are impact formulae for estimating the local damage caused by high-velocity impact loading. These impact formulae are classified into penetration depth, scabbing limit, and perforation limit formulae, where the scabbing and perforation limits indicate the minimum thicknesses required to prevent scabbing and perforation, respectively [6][7][8]. Penetration depth, in particular, has been extensively studied, and over 27 formulae have been proposed, so far, for predicting local damage [9][10][11][12][13][14][15][16][17][18][19][20][21].…”