A feasibility of enhancing the impact resistance of hybrid fibrous geopolymer composites: Experiments and modelling

Asrani, Neha P.; Murali, G.; Parthiban, K.; Surya, K.; Prakash, Anuj; Rathika, K.; Chandru, Uma

doi:10.1016/j.conbuildmat.2019.01.072

Cited by 106 publications

(35 citation statements)

References 63 publications

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“…This result was noticed in this research and several previous researches [14,32,34,62]. It is worth to mention that much higher ductility ratios reaching 5.0 were recorded for special types of concrete like engineered cementitious composites (ECC) [63] and layered fibrous concrete with very high fiber contents [2,6,21,22,23].…”

Section: Failure Patters and Impact Ductilitysupporting

confidence: 84%

“…However, this definition can be generalized to the repeated impact test as the ratio of number of impact blows at failure to that at cracking stage (ductility ratio). Several previous researches [2,6,21,22,23] used this definition to observe the ability of fibers to alter the behavior of concrete from brittle to more ductile under impact loading. In this study, it was found that the ductility ratio of the plain specimens was approximately 1, where all plain specimens failed at only 1 to 3 blows after cracking.…”

Section: Failure Patters and Impact Ductilitymentioning

confidence: 99%

“…Khalil et al [19] and Mastali and Davland [20] used the RBDWI test method to evaluate the impact resistance of Self-Compacting Concrete (SCC) containing crumb rubber. Most recently, several researches [2,6,21,22,23] were conducted to evaluate the impact resistance of layered fibrous concrete. In these researches, the course aggregate along with large amount of fibers were firstly mixed and placed in the molds, then after followed by the adding of a flowable cementitious grout that ingress inside the molds by means of gravity and fill voids between the aggregate and fibers.…”

Section: Introductionmentioning

confidence: 99%

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Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Abid

Abdul-Hussein

Ayoob

et al. 2020

Heliyon

105

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A B S T R A C TSteel fiber has become a proven material that can significantly alter the behavior of different types of concrete mixtures from brittle to more ductile ones. Rich literature is currently available on the mechanical properties of steel fiber-reinforced self-compacting concrete. However, the investigation of the impact resistance of this material to drop weight is still required to enrich the knowledge about its behavior under different loading conditions. An experimental work was conducted in this research to evaluate the performance of steel fiber-reinforced self-compacting concrete under repeated impact loading using the repeated blows test recommended by ACI 544-2R. The tests investigated the effect of drop weight and drop height in addition to fiber content. Straight microsteel fibers were incorporated in three volumetric contents of 0.5, 0.75 and 1.0% and were compared with a similar plain mixture. The test equipment was adjusted to conduct repeated impact loading from different dropheights and using different drop-weights. The adopted drop-heights were 450, 575 and 700 mm, while the adopted drop-weights were 4.5, 6.0 and 7.5 kg. The combination of the adopted drop-heights and weights composes four loading cases in addition to the standard loading case with a drop-weight and drop-height of 4.5 kg and 450 mm. The inclusion of micro steel fiber was found to significantly increase the impact resistance of selfcompacting concrete with percentage developments ranging from 150 to 860% compared to plain samples. The specimens tested under 4.5 kg and 450 mm drop weight and height exhibited the highest percentage improvement in impact resistance among the five loading cases. The results also showed that the impact ductility of fibrous specimens was up to 24% higher than that of plain specimens.

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Section: Failure Patters and Impact Ductilitysupporting

confidence: 84%

Section: Failure Patters and Impact Ductilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Abid

Abdul-Hussein

Ayoob

et al. 2020

Heliyon

105

View full text Add to dashboard Cite

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“…In practical terms, several impact situations in engineering can be considered, for instance, ship/barge bumping into bridge pier or offshore structures, industrial flooring, vehicle strikes on transportation structure, barriers, structures exposed to pipe whipping, sudden falling rocks, etc. [26]. The frequency and possibility of these types of impacts are considerably higher.…”

Section: Introductionmentioning

confidence: 99%

Impact Response of Hammerhead Pier Fibrous Concrete Beams Designed with Topology Optimization

Salaimanimagudam

Suribabu

Murali

et al. 2020

Period. Polytech. Civil Eng.

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Reducing the weight of concrete beams is a primary (beyond strength and durability) concern of engineers. Therefore, this research was directed to investigate the impact response of hammerhead pier concrete beams designed with density-based method topology optimization. The finite element topology optimization was conducted using Autodesk fusion 360 considering three different mesh sizes of 7 mm, 10 mm, and adaptive meshing. Three optimized hammerhead beam configurations; HB1, HB2, and HB3, respectively, with volume reductions greater than 50 %. In the experimental part of this research, nine beams were cast with identical size and configuration to the optimized beams. Three beams, identical to the optimized beams, were tested under static bending for verification purposes. In comparison, six more beams, as in the preceding three beams but without and with hooked end steel fibers, were tested under repeated impact load. The test results revealed that the highest flexural capacity and impact resistance at crack initiation and failure were recorded for the adaptive mesh beams (HB3 and HB3SF). The failure impact energy and ductility ratio of the beam HB3SF was higher than the beams HB1SF and HB2SF by more than 270 %. The results showed that the inclusion of steel fiber duplicated the optimized beam’s impact strength and ductility several times. The failure impact resistance of fibrous beams was higher than their corresponding plain beams by approximately 2300 to4460 %, while their impact ductility ratios were higher by 6.0 to 18.1 times.

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“…Combining 30% PP and 70% steel fibres (% by volume in total PP and steel fibre combination) in composites outperformed 100% steel mono fibre composites by an 18% increase in terms of flexural strength performance [16]. Similarly, the blend of (0.3 glass + 1.3 steel, % by volume) fibre in the composites brought a flexural strength increase of about 7% compared to using composites reinforced by steel mono fibre [19]. This increase is mainly attributed to the glass and steel fibre synergy that interconnected the micro and macro cracks in the tensile zone of the composites resulting in effectively controlling crack proliferations.…”

Section: Hfrg Materials Constituents and Fibre Hybridizationmentioning

confidence: 99%

Hybrid fibre-reinforced geopolymer (HFRG) composites as an emerging material in retrofitting aging and seismically-deficient concrete and masonry structures

et al. 2019

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Fibre-reinforced polymer (FRP) systems have recently become popular in repairing concrete or masonry structures because of their inherent advantages. In spite of these benefits, FRPs have drawbacks having low fire resistance, poor environmental sustainability and incompatibilty with the substrate concrete. The effort to address these issues has led to the development of an emerging strain hardening cementitious (SHC) material using an inorganic polymer known as hybrid fibre-reinforced geopolymer (HFRG) composites. Compared with cement-based SHC composites, HFRG has better bond performance to concrete substrates, higher fire resistance, greater corrosion durability and helps to reduce CO2 emissions. This paper reviews the recent development of HFRG composites as an emerging repair material. Literature reveals that flowability of a fresh HFRG mixture decreases with increasing fibre content though still workable up to 2% fibre volume. Fibre synergy could result in 10–181% higher flexural toughness of geopolymer composites than when just using mono fibres. The application of HFRG composites to RC beams increased displacement ductility by to 263%. To date, there has been no reported field application of HFRG as a repair material though mono-fibre FRG has been field-applied as a strengthening material in large-diameter sewer RC pipes, RC culverts, RC sewerage manholes and dam surface improvement.

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A feasibility of enhancing the impact resistance of hybrid fibrous geopolymer composites: Experiments and modelling

Cited by 106 publications

References 63 publications

Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Repeated drop-weight impact tests on self-compacting concrete reinforced with micro-steel fiber

Impact Response of Hammerhead Pier Fibrous Concrete Beams Designed with Topology Optimization

Hybrid fibre-reinforced geopolymer (HFRG) composites as an emerging material in retrofitting aging and seismically-deficient concrete and masonry structures

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