Experimental Study on GFRP Strips Strengthened New Two Stage Concrete Slabs under Falling Mass Collisions

Loganaganandan, M.; Murali, G.; Salaimanimagudam, M.P.; Haridharan, M. K.; Kothandapani, Karthikeyan

doi:10.1007/s12205-020-0331-8

Cited by 16 publications

(9 citation statements)

References 17 publications

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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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“…However, this kind of problem was eradicated in TECAFC since ECA and fibres were premixed and filled into the empty mould before grout injection [29,30]. The percentage of fibre TSC can be used up to 6% to achieve an imperative increase in compressive strength [31,32]. Furthermore, the SF has the potential to bridge cracks at a macroscopic level and higher energy is needed for fibre debonding and pull out, leading to delays in failure and exhibiting superior strength under compression [33,34].…”

Section: Compressive Strengthmentioning

confidence: 99%

Combined Effect of Multi-Walled Carbon Nanotubes, Steel Fibre and Glass Fibre Mesh on Novel Two-Stage Expanded Clay Aggregate Concrete against Impact Loading

et al. 2021

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The use of expanded clay aggregate (ECA) for developing lightweight concrete results in strength-reduction properties. However, the ECA-based concrete strength properties can be improved by adding steel fibre (SF), glass fibre mesh (GFM) and multi-walled nano-carbon tubes (MWCNT). The combined effect of MWCNT, GFM, SF and ECA-based concrete and its strength properties is still unexplored. It is worth drawing a logical conclusion concerning the impact on the strength of concrete by incorporating the materials mentioned above. Two-stage expanded clay aggregate fibrous concrete (TECAFC) is a new concrete type and an emerging research area in material engineering. The casting method of TECAFC includes the two essential phases as follows. First, ECA and fibres are filled into the empty cylindrical mould to develop a natural skeleton. Second, the grout comprising cement, sand and MWCNT, are injected into the developed skeleton to fill voids. In this research, eight mixtures were prepared with 0.1 and 0.2% of MWCNT, 2.5% dosage of SF and three different layers of GFM inserted between the two layers of concrete. These eight mixtures were divided into two series of three mixtures each, in addition to two reference mixtures that include no SF or GFM. The first series of mixtures was comprised of 0.1% of MWCNT and 2.5% of SF and one, two and three layers of GFM insertion. The second series was the same as the first series and the dosage of MWCNT was taken as 0.2%. All cylindrical specimens were tested under drop mass impact as per the suggestions made by the ACI Committee 544. The test results showed that incorporating steel fibres and GFM improved the cracking and failure impact resistance by more than 270 and 1100%, respectively, and increased the impact ductility index by more than 220%, significantly contributing to steel fibres.

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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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Experimental Study on GFRP Strips Strengthened New Two Stage Concrete Slabs under Falling Mass Collisions

Cited by 16 publications

References 17 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

Combined Effect of Multi-Walled Carbon Nanotubes, Steel Fibre and Glass Fibre Mesh on Novel Two-Stage Expanded Clay Aggregate Concrete against Impact Loading

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

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