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

Prasad, Nandhu; Murali, G.; Vatin, Nikolai

doi:10.3390/ma14195833

Cited by 13 publications

(9 citation statements)

References 82 publications

(119 reference statements)

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“…This behaviour is associated with some radial cracks in the specimens' top surface. The ductile fracture of fibre-reinforced specimens was attributed to the perfect bond with the surrounding matrix, due to the strong bond along the fibres [64][65][66][67]. Two-layered specimens comprising GC in the top layer and GFC in the bottom layer exhibited a ductile failure, and single cracks could be turned into multiple cracks [68,69]; hence, the brittleness was reduced significantly.…”

Section: Impact Ductility Indexmentioning

confidence: 99%

Investigations on the Response of Novel Layered Geopolymer Fibrous Concrete to Drop Weight Impact

2022

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In recent years, geopolymer concrete (GC) has become more popular in construction because of its multiple benefits, such as eco-friendliness, high temperature resistance and resistance to chemical attack in harsh environments. However, GC has limited deformation capability and tensile strength compared to ordinary concrete. Geopolymer fibrous concrete (GFC) exhibits high mechanical properties, such as compressive strength and impact strength. This study aimed to develop a novel composite comprising GFC at the tension zone and GC at the compression zone, and vice versa, are these composites were examined. The impact resistance of two-layered GC-GFC with various ratios (25–75, 50–50, 75–25%) was examined. In addition, a single layer specimen comprising GC and GFC was fabricated and tested as the reference specimen. Twenty-nine mixtures were developed and divided into four series. Four different types of fibre were used in this study; short polypropylene fibre, long polypropylene fibre, short steel fibre and long steel fibre. The ACI committee 544 drop weight test was used to evaluate the impact strength of specimens. Results indicated that the impact strength of GFC was significantly improved in long steel fibre-based specimens. In addition, two-layered specimens comprising different fibres—short polypropylene, long polypropylene, short steel and long steel—exhibited a positive influence on impact strength. Compared to a single-layer specimen, inferior impact strength was recorded in the two-layered specimen.

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Section: Impact Ductility Indexmentioning

confidence: 99%

Investigations on the Response of Novel Layered Geopolymer Fibrous Concrete to Drop Weight Impact

2022

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“…The bridging action of solitary fibres is the most important attribute of these fibres. The fibres begin their true action with the micro-cracks’ commencement prior to the first cracking surface [ 43 ]. Consequently, the cracking impact resistance is increased by the dispersed fibre.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

Enhancing the Impact Strength of Prepacked Aggregate Fibrous Concrete Using Asphalt-Coated Aggregates

et al. 2022

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The brittleness of plain concrete represents a significant issue to the integrity of concrete structures when subjected to impact loading. Recent rapid industrialization has attracted researchers to find a solution for concrete brittleness and enhance its ductility. In light of this, the prepacked aggregate fibrous concrete (PAFC) with single and double precoated coarse aggregates using asphalt is proposed and examined. Nine different mixtures were designed using polypropylene and steel fibre of 3% dosage with single and double asphalt-coated aggregates. Specimens were prepared with natural aggregate and 100% C-graded asphalt-coated aggregate to evaluate their impact strength. The ACI Committee 544 drop-weight impact standard was followed in the testing of all specimens. Results indicated that using asphalt-coated aggregate can improve the impact energies of concrete. The impact energy at cracking and failure of the single asphalt-coated aggregate specimen was 1.55 and 2.11 times higher, while the double-coated aggregate specimens exhibited 1.73 and 2.56 times greater than the natural aggregate specimen, respectively. The contribution of fibres in enhancing the impact resistance is remarkable compared to the single- and double-coated aggregates used in PAFC.

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“…(3) Concrete's non-homogeneity leads to a mix of design inconsistencies and impact strength dispersions [35]. (4) This test also included exercise performance, such as pulling and dropping a 4.54 kg load from a certain height [36]. Dropping a 4.54 kg steel ball from 457 mm above the specimen's top surface is part of the ACI 544 drop weight testing procedure.…”

Section: Impact Test Methods and Modificationsmentioning

confidence: 99%

Impact Resistance of Functionally Layered Two-Stage Fibrous Concrete

Murali

Prasad

Klyuev

et al. 2021

Fibers

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The impact resistance of functionally layered two-stage fibrous concrete (FLTSFC) prepared using the cement grout injection technique was examined in this study. The impact resistance of turtle shells served as the inspiration for the development of FLTSFC. Steel and polypropylene fibres are used in more significant quantities than usual in the outer layers of FLTSFC, resulting in significantly improved impact resistance. An experiment was carried out simultaneously to assess the efficacy of one-layered and two-layered concrete to assess the effectiveness of three-layered FLTSFC. When performing the drop-mass test ACI 544, a modified version of the impact test was suggested to reduce the scattered results. Instead of a solid cylindrical specimen with no notch, a line-notched specimen was used instead. This improvement allows for the pre-definition of a fracture route and the reduction of the scattering of results. The testing criteria used in the experiments were impact numbers associated to first crack and failure, mode of failure, and ductility index. The coefficient of variation of the ACI impact test was lowered due to the proposed change, indicating that the scattering of results was substantially reduced. This research contributes to the idea of developing enhanced, more impact-resistant fibre composites for use in possible protective structures in the future.

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

Cited by 13 publications

References 82 publications

Investigations on the Response of Novel Layered Geopolymer Fibrous Concrete to Drop Weight Impact

Investigations on the Response of Novel Layered Geopolymer Fibrous Concrete to Drop Weight Impact

Enhancing the Impact Strength of Prepacked Aggregate Fibrous Concrete Using Asphalt-Coated Aggregates

Impact Resistance of Functionally Layered Two-Stage Fibrous Concrete

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