Research on flexure and impact performance of functionally-graded two-stage fibrous concrete beams of different sizes

Prasad, Nandhu; Murali, G.

doi:10.1016/j.conbuildmat.2021.123138

Cited by 27 publications

(19 citation statements)

References 42 publications

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“…The compressive strength of PF was lower than the compressive strength of the SF. This was attributed to PF having a lower tensile strength and density than SF [ 2 , 11 ]. As shown in Figure 7 b, the double-layer D-SF-PF and D-PF-SF specimens demonstrated a 26.1 and 23.0% improvement in compressive strength, respectively, compared to the PAC.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…The incorporation of fibres into concrete increased its bridging ability significantly. The crack path was intricate, requiring tremendous effort to remove the fibre activity [ 2 , 11 ]. In particular, the fibre content of ordinary fibrous concrete was restricted to 2% due to workability issues, uniform fibre distribution, and fibre clustering, all of which contribute to increased voids, resulting in internal concrete flaws and a decrease in compressive strength [ 12 , 24 ].…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…Mastali et al [ 81 ] reported that functionally graded fibrous concrete curved slabs with planar fibre alignment demonstrated greater impact strength than curved concrete slabs with a three-dimensional fibre orientation. Figure 13 depicts the appearance of the fibre arrangement in PAFC and FTSFC [ 2 , 26 , 80 ]. All T-FG series specimens featured planar-aligned fibre, while the S-SF and S-PF specimens exhibited a three-dimensional fibre orientation.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…In general, a smaller COV was preferable in all cases because it reflected a more precise assessment. Figure 16 shows the COV calculated from the modified impact-test results versus the ACI method impact-test results from previous research [ 2 ]. The COV for Q1 and Q2 for the 12 combinations ranged from 32.8 to 50.5% and 9.0 to 43.3%, respectively.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…The idea of utilizing biomaterials is a novel insight into material technology, and this study area is referred to as biomimicry in a specific group. Composite concrete materials could provide a creative biological mix and more significant impact-resistant characteristics (e.g., using the carapace of turtle and tortoise) [ 2 ]. Nano/micro/mesoscale-level complex structures are composed of organic and inorganic components that are spatially structured.…”

Section: Introductionmentioning

confidence: 99%

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Modified Falling Mass Impact Test Performance on Functionally Graded Two Stage Aggregate Fibrous Concrete

2021

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This research examined the performance of functionally graded two-stage fibrous concrete (FTSFC) against modified repeated falling-mass impacts. This study led to the concept of creating improved multiphysics model of fibre composites with better impact resistance for potential protective constructions. FTSFC was developed based on the bio-inspiring strength of turtle shells. The excellent impact resistance of FTSFC was accomplished by including a larger quantity of steel and polypropylene fibres in the outer layers. At the same time, one- and two-layered concrete were cast and compared to evaluate the efficiency of three-layered FTSFC. To minimize the dispersed test results, a modified form of the 544 drop-mass impact test was recommended by the American Concrete Institute (ACI). The modification was a knife-edge notched specimen instead of a solid cylindrical specimen without a notch. This modification predefined a crack path and reduced the dispersion of results. Cracking and failure impact numbers, ductility index, and failure mode were the testing criteria. The suggested modification to the ACI impact test decreased the coefficient of variance, showing that the dispersion of test results was reduced significantly. This study led to the concept of creating improved, fibre composites with better impact resistance for potential protective constructions.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modified Falling Mass Impact Test Performance on Functionally Graded Two Stage Aggregate Fibrous Concrete

2021

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Recent Advances in Sources of Bio‐Inspiration and Materials for Robotics and Actuators

Yang

Chen

et al. 2023

Small Methods

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Bionic robotics and actuators have made dramatic advancements in structural design, material preparation, and application owing to the richness of nature and innovative material design. Appropriate and ingenious sources of bio‐inspiration can stimulate a large number of different bionic systems. After millennia of survival and evolutionary exploration, the mere existence of life confirms that nature is constantly moving in an evolutionary direction of optimization and improvement. To this end, bio‐inspired robots and actuators can be constructed for the completion of a variety of artificial design instructions and requirements. In this article, the advances in bio‐inspired materials for robotics and actuators with the sources of bio‐inspiration are reviewed. The specific sources of inspiration in bionic systems and corresponding bio‐inspired applications are summarized first. Then the basic functions of materials in bio‐inspired robots and actuators is discussed. Moreover, a principle of matching biomaterials is creatively suggested. Furthermore, the implementation of biological information extraction is discussed, and the preparation methods of bionic materials are reclassified. Finally, the challenges and potential opportunities involved in finding sources of bio‐inspiration and materials for robotics and actuators in the future is discussed.

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Exploring engineering properties of sustainable multi‐grade concrete: Materials, structural, and environmental aspects

Iqbal,

Irfan‐ul‐Hassan,

Siddiqui

et al. 2024

Structural Concrete

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Through experimental and theoretical studies, this research explores the materials, structural, and environmental aspects of multi‐grade concrete (MGC), a potentially sustainable structural concrete. The experimental part investigates the compressive, split cylinder, flexural, and shear strengths of MGC, essential parameters for the design of structural members composed of MGC. It also provides the relationships between various strengths. The compressive behavior is correlated with the cracking pattern and the confinement effect caused by the end platens. The theoretical study involves determining the carbon emissions (CEs) and modifying ASTM/ACI expressions for the flexural tensile strength (FTS) and shear capacity applicable to MGC. Three uni‐grade concretes (UGCs) with distinct materials, properties, and grades: grade 17 (G17), grade 25 (G25), and grade 30 (G30), were poured in layers of varied thicknesses to make two variants of MGC. Experimental investigations showed that the higher‐strength concrete (HSC) confined the lower‐strength concrete (LSC) part thus increasing the compressive strength. Replacing 50% of LSC with HSC led to an increase in compressive and shear strengths by 21% and 40%, respectively. The shear strength values of reinforced MGC beams observed experimentally are aligned with those obtained through the modified expressions developed by the authors. A trade‐off analysis among the strengths, CEs, and costs of UGC and MGC can aid in selecting MGC customized to specific requirements, thereby contributing to the development of sustainable structural concrete.

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Research on flexure and impact performance of functionally-graded two-stage fibrous concrete beams of different sizes

Cited by 27 publications

References 42 publications

Modified Falling Mass Impact Test Performance on Functionally Graded Two Stage Aggregate Fibrous Concrete

Modified Falling Mass Impact Test Performance on Functionally Graded Two Stage Aggregate Fibrous Concrete

Recent Advances in Sources of Bio‐Inspiration and Materials for Robotics and Actuators

Exploring engineering properties of sustainable multi‐grade concrete: Materials, structural, and environmental aspects

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