Review on Use of Nanomaterials in Concrete

Abstract

Various studies have highlighted the benefits of incorporating carbon nanotubes (CNTs) in concrete. They enhance compressive and flexural strength, prevent cracking, and improve durability. Different methods like sonication ensure uniform dispersion of CNTs in concrete. Additionally, research focuses on optimizing CNT concentrations to avoid adverse effects on properties like shrinkage and thermal conductivity. Overall, CNTs offer a promising solution to reinforce concrete and improve its mechanical properties effectively.

Introduction

I. INTRODUCTION

Plain concrete lacks tensile strength; short fibers and waste materials are explored for improvement. Strategy proposed to resist wrinkling in sandwich structures using CNT reinforcement. .Nanotechnology enhances concrete properties, focusing on CNTs' role.

Construction industry explores waste materials like plastics and fly ash, with CNTs improving composite properties. CNT-modified epoxies enhance bonding between concrete and FRP composites. Nanomaterials improve concrete mechanical properties; study proposes concentrated nanomaterial solution for evaluation. Incorporating nanomaterials enhances bond strength and mechanical properties of concrete. MWCNTs in epoxy resin enhance adhesion between BFRP sheets and concrete. Paper focuses on estimating concrete compressive strength with CNTs. CNTs improve UHPC properties; critical concentration proposed at 0.5 wt.%. CNTs improve cement composites, but dispersion challenges affect properties. CNTs reinforce concrete, but optimal content and dispersion methods need study.  MWCNTs improve cement paste properties; mechanical tests conducted. Carbon nanotubes enhance concrete strength; various addition methods explored. Nanomaterials hold promise for improving concrete properties, but research and standards development are ongoing.

II.  LITERATURE REVIEW

III. LIMITATIONS

Bonding behavior studied with limited replicate samples, suggesting future studies use at least five replicates per test condition and consider statistical analysis with ANOVA.Mixing nanomaterials limited to laboratory scale, hindering industrial application; significant variation in tensile strength data observed without graphene oxide. Additional CNTs beyond 0.5 wt.% have minimal effect on reducing autogenous shrinkage, increasing porosity and hindering cement hydration at higher concentrations. High CNT concentrations can increase permeability and corrosion rate, with poor dispersion affecting frost resistance and decreasing cement hydration rate beyond 0.3 c-wt.

Conclusion

Basalt fiber (BF) enhances compressive strength, while combination with carbon nanotubes (CNT) boosts flexural strength and splitting tensile strength. BF and waste glass powder (WGP) improve microstructure and reduce permeability. CNT reinforcement improves various concrete properties including tensile, compressive, and flexural strength, as well as thermal conductivity and corrosion resistance. Nanomaterials in construction composites offer high mechanical, thermal, and water resistance properties, with CNT dispersion critical for optimal strength. Addition of SWCNTs and MWCNTs to epoxy increases bond strength and interfacial fracture energy, though negative effects observed with high-density epoxy. Concentrated aqueous solution of nanomaterials enhances concrete mechanical properties, including compressive and splitting tensile strength, modulus of elasticity, and bond strength .Incorporation of nanomaterials in concrete improves splitting tensile strength and bond performance, with minimal volumetric deformation. MWCNT-modified epoxy enhances bonding behavior of BFRP-concrete joints, increasing bond strength and ductility. Addition of carbon nanotubes increases concrete compressive strength, with varying mix proportions and curing times analyzed for strength prediction. CNT concentration affects UHPC properties, with reduced autogenous shrinkage and increased thermal conductivity observed at optimal concentrations. CNTs improve durability of cementitious materials, though flowability decreases with higher concentrations. CNT reinforcement reduces porosity and improves freeze-thaw resistance of concrete within certain concentration ranges. MWCNT incorporation in concrete enhances compressive, flexural, and tensile strength, emphasizing homogeneous dispersion for improved properties. Carbon nanotubes significantly improve concrete properties, with uniform dispersion critical for effectiveness. Addition of carbon nanotubes enhances concrete mechanical properties, with oxidized MWCNTs showing the best improvements. Carbon nanotubes improve concrete properties through uniform dispersion and filling voids at the nano-scale.

References

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Copyright

Copyright © 2024 Prof. R. B. Ghogare, Vishal Takmoge, Karan Satav, Vijaysinh Morepatil. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.