Behaviour of ultra-high performance concretes incorporating carbon nanotubes under thermal load

Viana, Thiago Marques; Bacelar, Bruno Athaíde; Coelho, Isabela Domingues; Ludvig, Péter; Santos, White José dos

doi:10.1016/j.conbuildmat.2020.120556

Cited by 29 publications

(4 citation statements)

References 24 publications

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“…Contents of 0.01%, 0.02%, and 0.03% were employed in two manuscripts (29%) each, while 0.125%, 0.15%, and 1.00% were used only once (14%) each. In this context, several researchers have studied the effects of adding CNT to different concrete types on mechanical and durability properties [49][50][51][52][53][54][55][56][57]. In high concentrations CNTs are more difficult to disperse and may agglomerate due to van der Walls forces, and generate large pores in the cementitious composite, which worsens its mechanical properties, and consequently, its adhesion to steel bars [58].…”

Section: Characteristics Dispersion Techniques and Dosage Of Carbon N...mentioning

confidence: 99%

Bonding of Steel Bars in Concrete with the Addition of Carbon Nanotubes: A Systematic Review of the Literature

et al. 2022

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Advances and innovations in science and engineering have been increasingly supported by nanotechnology, and the modification of cementitious materials by nanoengineering is an expanding field. With this perspective, this paper aims to elucidate the behavior of steel bars in concrete with the addition of carbon nanotubes (CNTs) as a function of the characteristics of the cement-based material, the dispersion techniques and dosage of CNTs, the bond tests and specimen geometry, and the rebar characteristics. To reach this proposed goal, the ProKnow-C methodology was applied to select the most relevant publications from the last ten years, and then seven articles were fully analyzed. The results of the present systematic review of the literature revealed both consolidated knowledge and gaps to be filled in future research, as the need to study the chemical effect of adding these nanomaterials for improving steel–concrete adhesion, the bonding of thin bars in concrete, and the real influence of anchorage length on the steel–concrete bond, regardless of the use of CNTs, is vital.

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Section: Characteristics Dispersion Techniques and Dosage Of Carbon N...mentioning

confidence: 99%

Bonding of Steel Bars in Concrete with the Addition of Carbon Nanotubes: A Systematic Review of the Literature

et al. 2022

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“…The evaluated compositions showed compressive strength from 68.3 to 84.3 MPa. Viana et al (2020) [ 51 ] used CP-V-ARI to evaluate the influence of the incorporation of carbon nanotubes in HPC, obtaining compressive strength for concrete around 80 MPa at 28 days of cure. De Matos et al (2020) [ 52 ] used CP-V-ARI to produce UHP cement pastes with 28-day strength of around 130 MPa.…”

Section: Classic Components Used For Hpc and Uhpc Productionmentioning

confidence: 99%

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Marvila¹,

Azevedo²,

Matos

et al. 2021

Materials

110

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This review article proposes the identification and basic concepts of materials that might be used for the production of high-performance concrete (HPC) and ultra-high-performance concrete (UHPC). Although other reviews have addressed this topic, the present work differs by presenting relevant aspects on possible materials applied in the production of HPC and UHPC. The main innovation of this review article is to identify the perspectives for new materials that can be considered in the production of novel special concretes. After consulting different bibliographic databases, some information related to ordinary Portland cement (OPC), mineral additions, aggregates, and chemical additives used for the production of HPC and UHPC were highlighted. Relevant information on the application of synthetic and natural fibers is also highlighted in association with a cement matrix of HPC and UHPC, forming composites with properties superior to conventional concrete used in civil construction. The article also presents some relevant characteristics for the application of HPC and UHPC produced with alkali-activated cement, an alternative binder to OPC produced through the reaction between two essential components: precursors and activators. Some information about the main types of precursors, subdivided into materials rich in aluminosilicates and rich in calcium, were also highlighted. Finally, suggestions for future work related to the application of HPC and UHPC are highlighted, guiding future research on this topic.

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“…The production of higher strength concretes has been increasing in the last years to improve the performance of the structures [14]- [16]; however, the increased strength is achieved by higher amount of cements, which increase the environmental impacts of the concrete mixture.…”

Section: Introductionmentioning

confidence: 99%

Reduction of the environmental impacts of reinforced concrete columns by increasing the compressive strength: a life cycle approach

Alievi

Santoro

Kripka

2022

Rev. IBRACON Estrut. Mater.

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The building industry is one of the greatest environmental impact causers in the planet. Cement is the second most used material in the world and the consumption of concrete ranges between 20 to 30 Gt yearly. This demand for the materials ten ds to increase for the next 100 years. The increase of concrete strength to reduce the material consumption is one of the options proposed in literature to reduce the environmental impacts in building industry. However, few studies have been carried about the actual advantages of this strategy in building production. In this paper, a 15-storey reinforced concrete building was designed with three different concrete grades for its columns: 30 MPa, 40 MPa and 50 MPa. The results for the volume of concrete and the amount of reinforcing steel to produce the columns were used to perform a cradle-to-gate life cycle assessment (LCA) to determine the alternative with less environmental impacts in the production stage. Results indicate an advantage to adopt higher strength concretes in columns to reduce environmental impacts and the consumption of materials. Direct effects of higher strength in concretes made possible to reduce the consumption of concrete by 15%. There was also a significant reduction caused by indirect effects of higher strengths in concrete, with the reducing of steel consumption up to 22%. With the combination of the direct and indirect effects of higher compressive strengths, it was possible to reduce the environmental impacts of reinforced concrete in all categories studied in the LCA.

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Behaviour of ultra-high performance concretes incorporating carbon nanotubes under thermal load

Cited by 29 publications

References 24 publications

Bonding of Steel Bars in Concrete with the Addition of Carbon Nanotubes: A Systematic Review of the Literature

Bonding of Steel Bars in Concrete with the Addition of Carbon Nanotubes: A Systematic Review of the Literature

Materials for Production of High and Ultra-High Performance Concrete: Review and Perspective of Possible Novel Materials

Reduction of the environmental impacts of reinforced concrete columns by increasing the compressive strength: a life cycle approach

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