Experimental study on Steel Fiber Reinforced Concrete and Reinforced Concrete elements under concentrated loads

Trabucchi, Ivan; Tiberti, Giuseppe; Conforti, Antonio; Medeghini, Filippo; Plizzari, Giovanni

doi:10.1016/j.conbuildmat.2021.124834

Cited by 27 publications

(22 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mean orientation along Z, corresponding to the vertical direction during casting, is in general the lowest value among the three principal directions. This is coherent with the fact that, during the casting process, fibers tend to orient in horizontal planes, perpendicular to gravity [14,36,37]. For this reason, specimens cast with the isotropic method do not show a homogeneous three dimensional fiber orientation, but rather tend to a two-dimensional distribution.…”

Section: Electromagnetic Induction Resultssupporting

confidence: 65%

“…For the sake of comparison, additional plates with dimensions 150 9 610 9 610 [mm] were cast in a traditional way; concrete was poured from a large container, with outlet diameter of 300 mm, positioned centrically on top of the plate, and then compacted by external vibration. Due to the low workability of the fresh mixture, the fiber orientation of these specimens was considered roughly isotropic [12], even though one can expect a tendency towards a two-dimensional planar orientation [36,37]. The plates were then cut with the same procedure of the oriented specimens, and three beams free from external border effects were obtained from each plate.…”

Section: Specimens Descriptionmentioning

confidence: 99%

See 1 more Smart Citation

Steered fiber orientation: correlating orientation and residual tensile strength parameters of SFRC

et al. 2022

Self Cite

View full text Add to dashboard Cite

Adding steel fibers to concrete improves the post-cracking tensile strength of the composite material due to fibers bridging the cracks. The residual performance of the material is influenced by fiber type, content and orientation with respect to the crack plane. The latter is a main issue in fiber-reinforced concrete elements, since it significantly influences the structural behavior. The aim of this research is to develop a tailor-made composite material and casting method to orient fibers in order to optimize the performance of the material for structural applications. To this aim, a mechanized concreting device that induces such preferred fiber orientation is designed and fabricated. It uses vibration and a series of narrow channels to guide and orient fibers. A composite with oriented fibers is produced using a hybrid system of macro and micro fibers and high-performance concrete. From the same concrete batch, specimens are cast both with and without the fiber orientation device, obtaining different levels of fiber orientation. Three-point bending tests are performed to measure and compare the residual tensile strength capacities with standard specimens cast according to EN 14651. Elements with favorable fiber orientation show a significant increase in residual tensile strength with respect to the standard beams. Finally, computed tomography and an electromagnetic induction method are employed to better assess the orientation and distribution of fibers in the beams. Their results are in good agreement and enable to link the residual tensile strength parameters with fiber orientation.

show abstract

Section: Electromagnetic Induction Resultssupporting

confidence: 65%

Section: Specimens Descriptionmentioning

confidence: 99%

Steered fiber orientation: correlating orientation and residual tensile strength parameters of SFRC

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, it was observed that, when crushing failure occurs, the splitting crack propagation remains approximately “limited” to the D‐region defined in the elastic theory (equal to the side of the specimen “ d ”). On the contrary, crack depth in SFRC specimens with splitting failures extended up to 2.5 times “ d .” 16 …”

Section: Introductionmentioning

confidence: 99%

“…By considering the splitting‐crack plane, it is also proven that vertically cast prismatic samples present similar fiber orientation number of standard beams (150 × 150 × 600 mm) tested for the mechanical characterization of SFRCs. Trabucchi et al 16 carried out a broad experimental study on 30 prismatic samples either reinforced by SFRC or with traditional closed stirrups. The research highlighted that FRC with adequate post‐cracking performance ( f R1m > 4.16 and f R3m > 6.13 MPa) can move the collapse from splitting to crushing failure.…”

Section: Introductionmentioning

confidence: 99%

“…For doing that, experimental tests on FRC samples with a geometry that allows a full development of splitting crack were carried out. By doing so, a reference database was created by considering experimental results reported in the literature 14–16 . Subsequently, the effectiveness of current available analytical formulations to calculate the maximum splitting bearing capacity for this set of FRC elements was verified as a starting point for introducing a new analytical model able to better capture the experimental evidences.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A model for predicting the splitting bearing capacity of Fiber Reinforced Concrete elements under partially loaded areas

Trabucchi

Tiberti

Plizzari

2022

Structural Concrete

Self Cite

View full text Add to dashboard Cite

Concrete elements are frequently subjected to partially loaded areas; a typical example is represented by precast tunnel segments. In fact, during the excavation process, the hydraulic jacks of the boring machine exert, on the last assembled ring, high forces concentrated on small areas with respect to the size of ring joint. Similarly, when lining is embedded in ground, high hooping forces are transmitted through longitudinal joints, which present a contact zone smaller than the segment cross section. In both cases, spreading these loads into tunnel segments result in tensile transverse stresses which may cause splitting cracks. In the last decades, the growing desire to find more economic and sustainable solutions has driven enormous efforts in the tunnel industry to find new design solution such those based on Fiber Reinforced Concrete (FRC) or a combination of FRC and traditionally steel rebars. Research studies have already demonstrated the ability of fibers in controlling splitting crack phenomena. However, there is a lack of knowledge on reliable analytical approaches to quantify these benefits. The main aim of this paper is to develop a new model for determining the bearing capacity of FRC elements under partially loaded areas when splitting failure occurs. The analytical model herein reported allows a good prediction of the maximum loads exhibited by FRC prisms tested under high concentrated loads, whose data were selected from the literature.

show abstract

A Robust Biomimetic Superhydrophobic Coating with Superior Mechanical Durability and Chemical Stability for Inner Pipeline Protection

Zang,

Bian,

et al. 2024

Advanced Science

View full text Add to dashboard Cite

Durable superhydrophobic anti‐erosion/anticorrosion coatings are highly demanded across various applications. However, achieving coatings with exceptional superhydrophobicity, mechanical strength, and corrosion resistance remains a grand challenge. Herein, a robust microstructure coating, inspired by the cylindrical structures situated on the surface of conch shell, for mitigating erosion and corrosion damages in gas transportation pipelines is reported. Specifically, citric acid monohydrate as a pore‐forming agent is leveraged to create a porous structure between layers, effectively buffering the impact on the surface. As a result, the coating demonstrates remarkable wear resistance and water repellency. Importantly, even after abrasion by sandpaper and an erosion loop test, the resulting superhydrophobic surfaces retain the water repellency. The design strategy offers a promising route to manufacturing multifunctional materials with desired features and structural complexities, thereby enabling effective self‐cleaning and antifouling abilities in harsh operating environments for an array of applications, including self‐cleaning windows, antifouling coatings for medical devices, and anti‐erosion/anticorrosion protection, among other areas.

show abstract

Experimental study on Steel Fiber Reinforced Concrete and Reinforced Concrete elements under concentrated loads

Cited by 27 publications

References 14 publications

Steered fiber orientation: correlating orientation and residual tensile strength parameters of SFRC

Steered fiber orientation: correlating orientation and residual tensile strength parameters of SFRC

A model for predicting the splitting bearing capacity of Fiber Reinforced Concrete elements under partially loaded areas

A Robust Biomimetic Superhydrophobic Coating with Superior Mechanical Durability and Chemical Stability for Inner Pipeline Protection

Contact Info

Product

Resources

About