Effect of Sulfate Attack and Carbonation in Graphene Oxide–Reinforced Concrete Containing Recycled Concrete Aggregate

Devi, Sanglakpam Chiranjiakumari; Khan, Rizwan A.

doi:10.1061/(asce)mt.1943-5533.0003415

Cited by 25 publications

(7 citation statements)

References 44 publications

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“…The reinforcement’s passivity is not compromised by using up to 10% GRC as a cement replacement and/or 50% MCRA as a NA substitute in accordance with the service life prediction model proposed in the Spanish code of EHE-08 [ 14 ]. Most of the researchers enhanced the inferior properties of MCRA through various treatments such as CO 2 curing [ 21 ], carbonation [ 22 ], acid treatment [ 23 ], heating [ 24 ], heating and scrubbing [ 25 ], the combination of mechanical, chemical, and thermal treatment [ 26 ], and the addition of various supplementary cementitious materials [ 27 , 28 , 29 , 30 ]. Treated mixed recycled aggregates have a lot of promise for use in structural applications, which are not subject to relentless environmental conditions [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

et al. 2022

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The objective of this paper is to provide a comprehensive study about the performance of concrete using mixed coarse recycled aggregate (MCRA) as an alternative for natural aggregate (NA) at replacement levels of 0, 30, 60, and 100%, which can greatly reduce the environmental pollution by incorporating the construction and demolition wastes in the reproduction of concrete. The focus of this study was to use the raw MCRA that was directly obtained from a recycling plant and not further processed. Initially, MCRA was studied to ascertain if its property meets the recommended Indian standards for natural aggregates. Using the slump test, the workability of freshly prepared concrete with a characteristic strength of 30 MPa was assessed. Additionally, the mechanical performance of concrete was assessed on the specimens prepared in the different forms: cubes, cylinders, and beams. Moreover, Scanning Electron Microscopy (SEM) with EDAX, XRD, and FTIR were used to study the microstructural behavior of selected optimum and control mixes at 7 and 28 days of curing. The studies revealed that a higher MCRA content improved the workability of concrete and 30% replacement of MCRA improved the compressive strength by 11.01, 6.98, 6.19, and 14.24% at 7, 28, 56, and 90 days respectively. At the same time, the 30% replacement of the MCRA mix showed an improved split tensile and flexural strength by 2.92 and 6.26%, respectively. The microstructural analysis showed that the optimum mixture had a more condensed microstructure. Therefore, 30% replacement of MCRA can be incorporated in the characteristic strength of concrete of 30 MPa. In particular, MCRA incorporation had a positive influence similar to conventional concrete on the physical, mechanical, and microstructural properties, which can increase the utilization of all kinds of directly obtained construction and demolition wastes to increase the circular economy in the construction sector.

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Section: Introductionmentioning

confidence: 99%

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

et al. 2022

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“…The densification of the cementitious composites was also observed by Sanglakpam and Rizwan [ 21 ], where varying amounts of GO were added, resulting in considerable improvements in porosity and pore size distribution, culminating in a mechanical and chemical interaction between the matrix and its reinforcement, providing a combination of bonds and directly affecting mechanical properties [ 4 ]. Li et al [ 31 ] highlight that with densification and improvement in fiber–matrix interaction, there will be a reduction in the propagation of cracks at the macro- and microscopic levels, as well as an improvement in tensile strength and toughness and, consequently, in the durability of cementitious materials.…”

Section: Resultsmentioning

confidence: 80%

“…Enhancing the deposition of graphene oxide (GO) on the fiber surface is crucial for improving its interaction with the cement paste in fiber-reinforced concrete and mortars. This heightened deposition accelerates cement hydration, as indicated in [ 20 ], by augmenting the density of cementitious composites in the region containing nanoparticles, as proposed by Sanglakpam and Rizwan [ 21 ]. The binding effect and densification of the matrix are directly linked to the quality of Portland cement hydration products, consequently yielding products with superior strength and durability.…”

Section: Resultsmentioning

confidence: 96%

Effect of Graphene Oxide Surface Deposition Process on Synthetic Macrofibers and Its Results on the Microstructure of Fiber-Reinforced Concrete

Cecconello,

Poletto

2024

Polymers

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The improvement of the mechanical properties of concrete can be achieved with the use of synthetic macrofibers. However, this fiber–matrix interaction will be sufficiently efficient for tensile efforts only when there is a binding agent that associates the characteristics of the paste with the characteristics of the surface of the reinforcing material. As already identified, in a first phase of this research using synthetic microfibers, a better fiber–matrix interaction can be achieved with the surface treatment of synthetic fibers with graphene oxide. In this way, we sought to evaluate the surface treatment with graphene oxide on two synthetic polypropylene macrofibers (macrofiber “A” and macrofiber “B”) and its contribution to the concrete transition zone. The surface deposition on the macrofiber was carried out using the ultrasonication method; then, the macrofiber with the best deposition for creating reinforced concrete mixtures was identified. To evaluate the quality of GO deposition, scanning electron microscopy (SEM-FEG) and energy-dispersive spectroscopy (EDS) tests were carried out; the same technique was used to evaluate the macrofiber–matrix transition zone. The SEM-FEG images indicated that macrofiber “B” obtained greater homogeneity in surface deposition and it presented a 13% greater deposition of C in the EDS spectra. The SEM-FEG micrographs for reinforced concrete indicated a reduction in voids in the macrofiber–matrix transition zone for concretes that used macrofibers treated with GO.

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“…Similar approach has been successfully implemented in significant number of investigations as available in literature (23,44,45). Moreover, the authors have incorporated only selected amount of RCA (maximum 50%) and BA (maximum 30%) in comparison to the investigations wherein the effect of density has been considered for the higher amount of RCA (>50%) and BA (>30%) (18,20,(46)(47)(48)(49). Since the amount of altered ingredients was less and the source of procurement was not changed during entire investigation therefore for the same reason the authors have not considered the effect of variation of density of BA and RCA in the current study.…”

Section: Methodsmentioning

confidence: 99%

Shear strength and microstructural investigation on high-volume fly ash self-compacting concrete containing recycled concrete aggregates and coal bottom ash

Meena,

Singh,

Singh

2024

Mater. constr.

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This article presents the experimental outcomes of the shear strength and microstructural characteristics of high-volume fly ash self-compacting concrete (HVFYA-SCC) containing recycled concrete aggregates and coal bottom ash as partial replacements for natural coarse aggregates and natural fine aggregates. A total of ten numbers of mixes were produced, including HVFYA-SCC made without recycled concrete aggregates and coal bottom ash (as control) along with HVFYA-SCC mixes made with recycled concrete aggregates (from 25% to 50%) and coal bottom ash (from 10% to 30%). The compressive and shear strength of the HVFYA-SCC mixes were improved by 7% and 4%, respectively, with the incorporation of 20% coal bottom ash and 25% recycled concrete aggregates after 120 days of curing. On the other hand, scanning electron microscopic analysis revealed that incorporating coal bottom ash exhibited the pozzolanic reactions with fly ash densified the binder-aggregate matrix of the resulting HVFYA-SCC.

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Effect of Sulfate Attack and Carbonation in Graphene Oxide–Reinforced Concrete Containing Recycled Concrete Aggregate

Cited by 25 publications

References 44 publications

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

A Study on Mechanical and Microstructural Characteristics of Concrete Using Recycled Aggregate

Effect of Graphene Oxide Surface Deposition Process on Synthetic Macrofibers and Its Results on the Microstructure of Fiber-Reinforced Concrete

Shear strength and microstructural investigation on high-volume fly ash self-compacting concrete containing recycled concrete aggregates and coal bottom ash

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