The characteristics of engineered cementitious composites (ECCs) subjected to dynamic tensile loading and high-velocity projectile impact have been investigated are reported in this paper. Hybrid-fiber ECC containing a combination high-modulus steel fibers relatively low modulus polyethylene was adopted achieve desired balance between the ultimate strength strain capacity material required for impact- blast-resistant structures. Dynamic uniaxial tests at varying rates 2×10−6to0.2s−1 were...

In this paper the flexural behavior of a strain‐hardening engineered cementitious composite (ECC) is studied and compared with that observed in regular fiber‐reinforced (FRC). Unlike concrete or FRC, ECC materials are characterized by their ability to sustain higher levels loading after first cracking while undergoing additional straining. This gives ECCs significant advantage under loading. quasi‐brittle material such as ratio strength (the modulus rupture) tensile known vary between 1 3,...

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The performance of conventionally reinforced concrete (RC) beams strengthened in flexure with externally bonded fiber-reinforced polymers (EB-FRP) was studied by compiling and analyzing an experimental database. A total 127 specimens from 23 separate studies were included the profile database is given, followed analysis trends failure mode, strength gain, deformability. Failure debonding FRP prevalent among One-third external reinforcement added showed increases 50% or more combination...

This paper presents the results of an experimental study to evaluate damage and failure mode hybrid-fiber engineered cementitious composite (ECC) panels caused by large projectiles or fragments. The aim is quantify extent which ECC improves resistance blast against impact loading. Drop weight tests were conducted on full-scale blast/shelter (2m×1m×0.05–0.1m) their response performance under Conventional steel reinforced concrete (RC) fiber-reinforced (FRC) also tested identify advantages...

This study investigates the punching shear behavior of Glass Fiber-Reinforced Polymer (GFRP)-reinforced concrete slabs, addressing critical gaps in current design guidelines for high-strength (HSC). The objective is to evaluate impact strength, including normal-strength (NSC, 30 MPa) and HSC (60 90 MPa), on resistance, bridging lack experimental data that limits use FRP-reinforced slabs. research employs testing three full-scale slab specimens (1.5 m × 1.5 0.1 m) under concentric monotonic...

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In this paper, the results of an experimental study on effect fiber volume fraction off‐crack‐plane fracture energy in a strain‐hardening engineered cementitious composite (ECC) are presented. Unlike well‐known quasi‐brittle behavior reinforced concrete, ECC exhibits quasi‐ductile response by developing large damage zone prior to localization. zone, material is microcracked but continues strain‐harden locally. The areal dimension has been observed be order 1000 cm 2 double cantilever beam...

A probabilistic-based micromechanical model has been developed for the postcracking behavior of a brittle matrix reinforced with short, randomly distributed fibers. The that predicts composite-bridging stress crack-opening displacement (COD) relationship, accounts fiber pullout, tensile rupture, and local frictional effect called snubbing. However, it does not account bending possible spalling at exit points inclined fibers from matrix. assumes fiber/matrix interface is controlled by...

This paper reports the results of an experimental program on effectiveness a Ductile Fiber Reinforced Cementitious Composite (DFRCC) material, which exhibit strain-hardening and multiple-cracking bahavior under flexural loadings, in retarding corrosion steel Concrete (RC) beams. Based collective findings from theoretically-estimated losses, rapid chloride permeability tests, pH value as well structural it was concluded that Functionally-Graded (FGC) beams, where layer DFRCC material used...

In this paper, the tensile properties of cement‐based composites containing random discontinuous steel fibers are reported. Direct tests were performed to study effects fiber length (hence aspect ratio), interfacial bonding, and processing conditions on composite properties. Composite strength ductility highlighted discussed.

An analytical model for the design of strain-hardening and multiple-cracking behavior engineered cementitious composites (ECC) containing hybrid fibers is proposed. The predicts first crack strength ultimate bridging fiber ECC. also minimum (critical) volume fraction required to exhibit in uniaxial tension. verified with experimental results ECC specimens. A parametric study performed, using this model, evaluate effects length, diameter, interfacial bond on strength, critical fibers. It...