Structural Behavior of Fibrous-Ferrocement Panel Subjected to Flexural and Impact Loads

Murali, G.; Amran, Mugahed; Fediuk, Roman; Vatin, Nikolai; Raman, Sudharshan Naidu; Maithreyi, Gundu; Sumathi, A.

doi:10.3390/ma13245648

Cited by 21 publications

(10 citation statements)

References 25 publications

(24 reference statements)

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“…Using a similar approach, the introduced mixes' resistance to repeated impacts following surface cracking was also evaluated in this paper. IDI was defined in earlier research [47,62,63] as the ratio of the failure impact number to the cracking impact number, and this definition was also utilized in the current study, where IDI equals the ratio of A2 to A1 for each combination. Figure 11 depicts the IDI values of four series specimens.…”

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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“…Haist and Ferrara investigated the rheological properties of high-performance FRC during the mixing process and studied the influence of steel fibers on the rheological properties and concluded that thixotropic behaviors increase with the addition of steel fibers [47]. The distribution and orientation of the steel fibers also have an impact on the rheological behavior [25,[48][49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Rheological Behavior and Strength Characteristics of Cement Paste and Mortar with Fly Ash and GGBS Admixtures

et al. 2021

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A cement paste or mortar is composed of a mineral skeleton with micron to millimeter-sized grains, surrounded by water filaments. The cohesion or shear resistance in the cement paste and mortar is caused by capillary forces of action. In the case of mortar mixes, there is friction between the particles. Therefore, the mortar mixture shows both friction between particles and cohesion, while the paste shows only cohesion, and the friction between particles is negligible. The property of the cement paste is greatly influenced by the rheological characteristics like cohesion and internal angle friction. It is also interesting that when studying the rheology of fresh concrete, the rheological behavior of cement paste and mortar has direct applicability. In this paper, the rheological characteristics of cement paste and mortar with and without mineral admixtures, that is, fly ash and ground granulated blast-furnace slag (GGBS), were studied. A cement mortar mix with a cement-to-sand ratio of 1:3 was investigated, including fly ash replacement from 10% to 40%, and GGBS from 10% to 70% of the weight of the cement. A suitable blend of fly ash, GGBS, and ordinary Portland cement (OPC) was also selected to determine rheological parameters. For mortar mixtures, the flow table was conducted for workability studies. The flexural and split tensile strength tests were conducted on various mortar mixtures for different curing times. The results indicate that in the presence of a mineral mixture of fly ash and GGBS, the rheological behavior of paste and mortar is similar. Compared with OPC-GGBS-based mixtures, both cement with fly ash and ternary mixtures show less shear resistance or impact resistance. The rheological behavior of the mortar also matches the rheological behavior in the flow table test. Therefore, it is easy to use the vane shear test equipment to conduct cohesion studies to understand the properties of cement paste and mortar using mineral admixtures. The strength results show that the long-term strength of GGBS-based mixtures and ternary mixed mixtures is better than that of fly-ash-based mixtures. For all mixtures, the strength characteristics are greatest at a w/b ratio of 0.6.

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“…The addition of fiber increased the impact energy absorption and delayed the crack initiation [46]. The steel fibers significantly contributed to arresting crack propagation in the meantime, transmitting the energy effectively [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66]. Fully fibered concrete HPB-2 and HPB-4 were 2318.4 J and 2725.1 J, respectively, had impact energy at the initial crack while compared with the Tension zone fibered concrete HPB-2-T and HPB-4-T were 325.4 J and 488.1 J, respectively.…”

Section: Impact Test Resultsmentioning

confidence: 99%

Impact Response of Preplaced Aggregate Fibrous Concrete Hammerhead Pier Beam Designed with Topology Optimization

Salaimanimagudam

Murali

Vardhan³

et al. 2021

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This research aimed to study the impact response of topology optimized hammerhead pier beam (HPB) based on the density approach. The HPB is prepared with the concept of preplaced aggregate fibrous concrete (PAFC) comprising two primary approaches; first, the coarse aggregate and fiber are prepacked into the designed formwork. Second, the gaps between the aggregate and fiber are filled with cement grout. In this work, an attempt has been made to study an impact response of HPB made with PAFC. Five HPBs were prepared and strengthened with steel fibers with two different schemes, Firstly, the HPB was reinforced with a full cross-section at 2 and 4% of steel fiber, while another set of beams were only reinforced in the tension zone with the same amount of fibers. The study parameters included compressive strength, impact strength, impact ductility index, number of main and secondary cracks, and failure pattern. It was observed that the PAFC had an increase in compressive strength up to 56.9%, compared with nonfibred concrete. A fully fibered concrete beam with 4% fiber addition was the best at taking impact, and the initial crack and failures were observed at 2725.1 J and 3009.8 J, respectively, compared with non-fibered and tension zone fibered concrete beams. Compressive local damage and transverse flexural cracks were observed, which had caused initial cracks and final failure. The HPB with a full reinforced scheme at 4% dosage exhibited higher impact strength than the normal concrete and beam reinforced only in the tension zone.

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Structural Behavior of Fibrous-Ferrocement Panel Subjected to Flexural and Impact Loads

Cited by 21 publications

References 25 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

Rheological Behavior and Strength Characteristics of Cement Paste and Mortar with Fly Ash and GGBS Admixtures

Impact Response of Preplaced Aggregate Fibrous Concrete Hammerhead Pier Beam Designed with Topology Optimization

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