High performance cementitious nanocomposites: The effectiveness of nano-Graphite (nG)

Mehdi Chougan; Emanuele Marotta; Francesca R. Lamastra; Francesco Vivio; Giampiero Montesperelli; Ugo Ianniruberto; Seyed Hamidreza Ghaffar; Mazen J. Al-kheetan; Alessandra Bianco

doi:10.1016/j.conbuildmat.2020.119687

High performance cementitious nanocomposites: The effectiveness of nano-Graphite (nG)

Mehdi Chougan, Emanuele Marotta, Francesca R. Lamastra, Francesco Vivio, Giampiero Montesperelli, Ugo Ianniruberto, Seyed Hamidreza Ghaffar, Mazen J. Al-kheetan, Alessandra Bianco^*

^*Corresponding author for this work

Civil Engineering

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

In this study an extensive experimental campaign has been conducted on mortars modified with nano-Graphite (nG) aimed to assess the properties of the resulting nanocomposites in terms of density, microstructure, flexural and compressive strength, damping ratio, thermal and electrical conductivity. Permeability properties were also investigated in terms of initial surface absorption, water contact angle, volume of permeable voids and chloride ion diffusion. Premixed mortars have been modified with different dosages of commercial nG, i.e. 0.01%, 0.1%, or 0.2% by weight of cement. The rheological behavior of the fresh admixtures has been investigated. Specimens were casted in bars and hardened in water for 7, 14 or 28 days. At 28 days all samples showed enhanced density (i.e. up to 16%) and mechanical properties (i.e. up to 30%) combined to remarkable decreased overall permeability. The lowest dosage of nG (i.e. 0.01% by weight of cement) resulted in cement nanocomposites with the highest increase in damping ratio, electrical and thermal conductivity, 68%, 30% and 55%, respectively.

Original language	English
Article number	119687
Journal	Construction and Building Materials
Volume	259
DOIs	https://doi.org/10.1016/j.conbuildmat.2020.119687
Publication status	Published - 30 Oct 2020

Bibliographical note

Publisher Copyright:
© 2020

Keywords

Cementitious materials
Damping ratio
Electrical resistivity
Mechanical properties
Microstructure
Nano-graphite
Permeability
Rheology
Thermal conductivity

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

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10.1016/j.conbuildmat.2020.119687

Cite this

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title = "High performance cementitious nanocomposites: The effectiveness of nano-Graphite (nG)",

abstract = "In this study an extensive experimental campaign has been conducted on mortars modified with nano-Graphite (nG) aimed to assess the properties of the resulting nanocomposites in terms of density, microstructure, flexural and compressive strength, damping ratio, thermal and electrical conductivity. Permeability properties were also investigated in terms of initial surface absorption, water contact angle, volume of permeable voids and chloride ion diffusion. Premixed mortars have been modified with different dosages of commercial nG, i.e. 0.01%, 0.1%, or 0.2% by weight of cement. The rheological behavior of the fresh admixtures has been investigated. Specimens were casted in bars and hardened in water for 7, 14 or 28 days. At 28 days all samples showed enhanced density (i.e. up to 16%) and mechanical properties (i.e. up to 30%) combined to remarkable decreased overall permeability. The lowest dosage of nG (i.e. 0.01% by weight of cement) resulted in cement nanocomposites with the highest increase in damping ratio, electrical and thermal conductivity, 68%, 30% and 55%, respectively.",

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AU - Chougan, Mehdi

AU - Marotta, Emanuele

AU - Lamastra, Francesca R.

AU - Vivio, Francesco

AU - Montesperelli, Giampiero

AU - Ianniruberto, Ugo

AU - Hamidreza Ghaffar, Seyed

AU - Al-kheetan, Mazen J.

AU - Bianco, Alessandra

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AB - In this study an extensive experimental campaign has been conducted on mortars modified with nano-Graphite (nG) aimed to assess the properties of the resulting nanocomposites in terms of density, microstructure, flexural and compressive strength, damping ratio, thermal and electrical conductivity. Permeability properties were also investigated in terms of initial surface absorption, water contact angle, volume of permeable voids and chloride ion diffusion. Premixed mortars have been modified with different dosages of commercial nG, i.e. 0.01%, 0.1%, or 0.2% by weight of cement. The rheological behavior of the fresh admixtures has been investigated. Specimens were casted in bars and hardened in water for 7, 14 or 28 days. At 28 days all samples showed enhanced density (i.e. up to 16%) and mechanical properties (i.e. up to 30%) combined to remarkable decreased overall permeability. The lowest dosage of nG (i.e. 0.01% by weight of cement) resulted in cement nanocomposites with the highest increase in damping ratio, electrical and thermal conductivity, 68%, 30% and 55%, respectively.

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KW - Mechanical properties

KW - Microstructure

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KW - Thermal conductivity

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High performance cementitious nanocomposites: The effectiveness of nano-Graphite (nG)

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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