New cementitious composite building material with enhanced toughness

Ferro, Giuseppe Andrea; Tulliani, Jean‐Marc; López, A.; Jagdale, Pravin

doi:10.1016/j.tafmec.2015.01.005

Cited by 36 publications

(7 citation statements)

References 15 publications

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“…Besides, GNPs can facilitate the CNTs dispersion which leads to an increase in overall strength [38]. Additionally, in nano intruded cementitious composite, crack propagation is stopped by various types of inclusions: pores, grains, fibers, aggregates, and particles [39]. CNTs and GNPs also block the cracks by deviating and/or arresting their propagating tips, like an obstacle (Figure 11).…”

Section: Mechanical and Microstructural Cementitious Composite Characmentioning

confidence: 99%

Ultra-Sensitive Affordable Cementitious Composite with High Mechanical and Microstructural Performances by Hybrid CNT/GNP

2020

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In this paper a hybrid combination of carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) was used for developing cementitious self-sensing composite with high mechanical, microstructural and durability performances. The mixture of these two nanoparticles with different 1D and 2D geometrical shapes can reduce the percolation threshold to a certain amount which can avoid agglomeration formation and also reinforce the microstructure due to percolation and electron quantum tunneling amplification. In this route, different concentrations of CNT + GNP were dispersed by Pluronic F-127 and tributyl phosphate (TBP) with 3 h sonication at 40 °C and incorporated into the cementitious mortar. Mechanical, microstructural, and durability of the reinforced mortar were investigated by various tests in different hydration periods (7, 28, and 90 days). Additionally, the piezoresistivity behavior of specimens was also evaluated by the four-probe method under flexural and compression cyclic loading. Results demonstrated that hybrid CNT + GNP can significantly improve mechanical and microstructural properties of cementitious composite by filler function, bridging cracks, and increasing hydration rate mechanisms. CNT + GNP intruded specimens also showed higher resistance against climatic cycle tests. Generally, the trend of all results demonstrates an optimal concentration of CNT (0.25%) + GNP (0.25%). Furthermore, increasing CNT + GNP concentration leads to sharp changes in electrical resistivity of reinforced specimens under small variation of strain achieving high gauge factor in both flexural and compression loading modes.

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Section: Mechanical and Microstructural Cementitious Composite Characmentioning

confidence: 99%

Ultra-Sensitive Affordable Cementitious Composite with High Mechanical and Microstructural Performances by Hybrid CNT/GNP

2020

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“…Moreover, when used in proper percentages as filler, biochar can enhance the mechanical properties of cement-based materials, such as compressive strength, flexural strength, and toughness. [16][17][18][19][20][21][22][23][24][25] These positive effects, strictly depend on the percentage of biochar addition, on its physical and chemical properties, as well as on the curing type and time adopted for the cementitious material. More in detail, improved performance can be observed for biochar additions between 1% and 5% (by weight of cement).…”

Section: Introductionmentioning

confidence: 99%

“…During pyrolysis, biochar particles capture a high volume of stable carbon in their chemical structure, and this means that carbon can be indirectly locked for decades in buildings, which become carbon‐sink themselves. Moreover, when used in proper percentages as filler, biochar can enhance the mechanical properties of cement‐based materials, such as compressive strength, flexural strength, and toughness 16–25 . These positive effects, strictly depend on the percentage of biochar addition, on its physical and chemical properties, as well as on the curing type and time adopted for the cementitious material.…”

Section: Introductionmentioning

confidence: 99%

Combined effects of biochar and recycled plastic aggregates on mechanical behavior of concrete

Sirico

Bernardi

Sciancalepore

et al. 2023

Structural Concrete

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Only in Europe, every year around 29 million tons of plastic waste are generated and only about 35% of such waste is collected for recycling. This results in huge amounts of plastic waste threatening the environment. One of the possible solutions for disposal can be represented by the concrete industry. Several research works have already studied the use of plastic waste in concrete mix as partial replacement for aggregates, showing that this use of plastics can contribute to reducing the environmental impact of concrete production by saving non‐renewable resources. At the same time, lightweight concrete can be produced but at a non‐negligible cost of a mechanical strength reduction. This work aims at investigating the effects on concrete physical and mechanical performances resulting from the introduction of recycled plastic aggregates in combination with another kind of waste used as filler, namely biochar. Biochar, which is the solid carbonaceous by‐product resulting from wood‐waste pyro‐gasification, can have the role of carbon sequestrating additive in concrete, being able to fix carbon in a stable form in buildings for decades. The experimental findings obtained in this work show that the combination of biochar and recycled plastic waste, which was never investigated before, can help to obtain concretes with satisfactory mechanical performance, which promote circular economy principles. Thanks to biochar addition, the reduction in mechanical properties due to the presence of plastics is extremely limited with respect to control; moreover, these concretes demonstrate better behavior in terms of fracture energy and ductility.

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“…Coir and its associated coir pith have gained popularity in cement composites in recent years as the industry shifts to alternative uses of renewable energy to reduce environmental impact and production costs (Brasileiro et al, 2013). The use of coir fiber in concrete reinforcement is deemed to increase tensile and flexural strength (Ferro G et al, 2015). When mixed into concrete, this helps control the growth of tensile cracking (Hamood et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Quaternary Ammonium Based Compound Improves Interfacial Bond and Hydrophobicity of Coirpith-Cement Composite

Lorana

2022

J. Educ., Mngt., and Dev. Studies

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Coir pith is a coconut waste derived from the extraction of coconut fiber that accounts for 70% of total husk. With an estimated 6.7 million husks produced in the Philippines annually, a large fraction of waste known as coir pith is left to rot, thrown or burned. Coir pith in cement board composite is applicable as insulation and a light indoor construction material due to its high-water absorption properties and less strength. The study sought to solve the high-water absorption problem while aiming at improving the strength and durability of the composite that will meet the needs for indoor and outdoor construction materials. According to the study's findings, QUAC increases the hydrophobicity of coir pith-cement composites, improves interfacial bonds, and has the potential for light indoor and outdoor construction.

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New cementitious composite building material with enhanced toughness

Cited by 36 publications

References 15 publications

Ultra-Sensitive Affordable Cementitious Composite with High Mechanical and Microstructural Performances by Hybrid CNT/GNP

Ultra-Sensitive Affordable Cementitious Composite with High Mechanical and Microstructural Performances by Hybrid CNT/GNP

Combined effects of biochar and recycled plastic aggregates on mechanical behavior of concrete

Quaternary Ammonium Based Compound Improves Interfacial Bond and Hydrophobicity of Coirpith-Cement Composite

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