Impact Resistance of Recycled Aggregate Concrete with Single and Hybrid Fibers

Ismail, Shariman Ismadi; Ramli, Mahyuddin

doi:10.1051/matecconf/20164702001

Cited by 10 publications

(6 citation statements)

References 14 publications

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“…However, there is still ongoing controversy regarding the efficiency of using recycled rubber granules in concrete production, particularly with regards to the associated drop in mechanical strength [28]. Although various studies explored TSC in terms of its performance under static loading [27,29], there is a dearth of information on its performance under impact loads.…”

Section: Introductionmentioning

confidence: 99%

Eco-Efficient Fiber-Reinforced Preplaced Recycled Aggregate Concrete under Impact Loading

2019

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This study explores highly eco-efficient preplaced aggregate concrete mixtures having superior tensile characteristics and impact resistance developed for pavement and infrastructure applications. A fully recycled granular skeleton consisting of recycled concrete aggregate and recycled tire rubber granules, and steel wire fibers from scrap tires are first placed in the formwork, then injected with a flowable grout. Considering its very high recycled content and limited mixing and placement energy (only the grout is mixed, and no mechanical vibration is needed), this material has exceptional sustainability features and offers superior time and cost savings. Moreover, typical problems of rapid loss of workability due to the high-water absorption of recycled aggregates and the floating of lightweight tire rubber granules are prevented since the aggregates are preplaced in the formwork. The much higher granular content and its denser skeleton reduce the cementitious dosage substantially and provide high volume stability against shrinkage and thermal strains. The behavior under impact loading of this sustainable preplaced recycled aggregate concrete, incorporating randomly dispersed steel wire fibers retrieved from scrap tires, was investigated using a drop weight impact test. The results show that recycled tire steel wire fibers significantly enhanced the tensile and impact properties. A two-parameter Weibull distribution provided an accurate prediction of the impact failure strength of the preplaced recycled aggregate concrete mixtures, allowing to avert additional costly laboratory experiments.

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Section: Introductionmentioning

confidence: 99%

Eco-Efficient Fiber-Reinforced Preplaced Recycled Aggregate Concrete under Impact Loading

2019

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“…When nanosilica was put into the mixture, the impact energy for mixtures with and without steel fibers can be further enhanced by 1.3–3.5 times [ 101 ]. The enhancement was attributed to the improvement in microstructure, especially reduced porosity and modified interfacial transition zone, which affect fracture propagation directly [ 108 ].…”

Section: Other Propertiesmentioning

confidence: 99%

Self-Compacting Alkali-Activated Materials: Progress and Perspectives

et al. 2021

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Alkali-activated materials (AAMs) are considered to be alternative cementitious materials for civil infrastructures. Nowadays, efforts have been made in developing AAMs with self-compacting ability. The obtained self-compacting AAMs (SCAAMs) accomplish superior passing and filling properties as well as excellent mechanical and environmental advantages. This work critically revisits recent progresses in SCAAMs including mixture proportions, fresh properties, mechanical strength, microstructure, acid and sulfate resistance, high temperature behaviors, impact resistance and interface shear strength. To facilitate direct comparison and interpretation of data from different publications, mixture proportions were normalized in terms of the content of key reactive components from precursors and activators, and correlation with mechanical behaviors was made. Moreover, special attention was paid to current research challenges and perspectives to promote further investigation and field application of SCAAMs as advanced construction material.

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“…They concluded that the specimen with fiber content of 1% combined with 25% PP and 75% NY fiber presents better performance in terms of the compressive strength, flexural strength, and split tensile strength of concrete compared with other specimens. In another research, Ismail and Ramli [21] observed that a recycled aggregate concrete mix incorporated with hybrid fibers (polyolefin and PP fibers) exhibits higher impact resistance characteristics than single fiber specimens. Although present studies have analyzed the utilization of hybrid fibers in reinforced recycled aggregate concrete composites, the benefits of hybrid fibers in enhancing the various properties of mortar using FRA remain unclear.…”

Section: Introductionmentioning

confidence: 97%

Mechanical properties and microstructure of recycled mortar reinforced with hybrid fiber

Ismail

Hamid

Yaacob³

et al. 2018

IJET

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This study investigated the hybrid effects of two types of microfiber, namely, polypropylene and nylon, on the mechanical properties of high-strength mortar, which produced fine recycled aggregate (FRA). The amount of microfibers was maintained at a volumetric fraction of 0.6%. The microstructure and mechanical strength properties (compressive strength and flexural strength) of recycled mortar reinforced with hybrid-size microfibers were evaluated at various curing ages. Experimental results show that the inclusion of hybrid fibers significantly influenced the mechanical performance of the recycled mortar. The hybridization fiber at volume fraction 0.3% polypropylene + 0.3% nylon yielded the most promising mechanical performance. Enhancements of 8% on compressive and 11% flexural strength were achieved at 28 days. Scanning electron microscopy observations revealed that reinforcement at the microscale prohibited the initiation and growth of cracks at the micro level. High loads were required to form macrocracks within composites, thereby improving the mechanical strength of the mortar matrix.

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Impact Resistance of Recycled Aggregate Concrete with Single and Hybrid Fibers

Cited by 10 publications

References 14 publications

Eco-Efficient Fiber-Reinforced Preplaced Recycled Aggregate Concrete under Impact Loading

Eco-Efficient Fiber-Reinforced Preplaced Recycled Aggregate Concrete under Impact Loading

Self-Compacting Alkali-Activated Materials: Progress and Perspectives

Mechanical properties and microstructure of recycled mortar reinforced with hybrid fiber

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