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 27 publications

(3 citation statements)

References 24 publications

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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

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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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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

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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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“…Other studies have sought to improve the quality of concrete, as well its durability and strength, by adding fibers such as metallic fibers (Yap et al, 2015a;Yap et al, 2015b), polypropylene (Lanzoni, Nobili & Tarantino, 2012), carbon (Viana et al, 2020) and vegetables (coconut, sisal, among others). The fibers contribute to a greater toughness to tensile strength and to a reduction of the porosity and of the shrinkage cracks of concrete.…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber Waste Used as Reinforcement for Concrete with Recycled Marble Aggregate

Barbosa¹,

Santos²,

Ludwig³

et al. 2021

JMS

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Sustainable development in the 21st century depends on the reuse of materials and products, as well as on economic and environmental incentives for recycling. Several studies have sought to improve the quality of concrete, as well as its durability and strength, by adding fibers (metallic, polypropylene, carbon, vegetables) or by replacing the aggregate. The use of optical fiber waste in concrete is still incipient and few studies address the use of marble aggregate to be used in concrete. This research assesses the behavior of the mixture composed of: Portland cement + fine aggregate (sand from crushed marble waste) + coarse aggregate (gneiss) + optical fiber waste and water. The compressive strength, the tensile strength and the modulus of elasticity of concrete and the durability of optical fiber waste in alkaline composite were tested through microstructural evaluation. The results present an increase of about 20% in the mechanical properties and a reduction in the rigidity of the mixture, making the material more ductile. The superficial protection of the fibers made them more resistant to the alkaline attack of the cement. The knowledge acquired would allow the creation of sustainable concrete reinforced with optical fiber in a much more efficient way.

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

Cited by 27 publications

References 24 publications

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

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

Optical Fiber Waste Used as Reinforcement for Concrete with Recycled Marble Aggregate

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