Full factorial design analysis of carbon nanotube polymer-cement composites

Cota, Fábio de Paiva; Panzera, Túlio Hallak; Schiavon, Marco A.; Christofóro, André Luis; Borges, Paulo Henrique Ribeiro; Bowen, Chris R.; Scarpa, Fabrizio

doi:10.1590/s1516-14392012005000077

Cited by 20 publications

(17 citation statements)

References 11 publications

(12 reference statements)

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“…The approach of dispersing CNF/CNT directly within cement paste during mixing is not feasible, as the thickening of cement paste begins within a short period after addition of water [75]. The mixing process using a Hobart mixer, commonly used to prepare mortar paste, cannot ensure proper dispersion of CNT within cementitious matrix [76], resulting in large CNT clusters within the hydrated paste ( Figure 4). To avoid this situation, the strategy commonly employed for mixing CNTs/CNFs with cementitious matrices is to disperse these nanomaterials first in water, followed by mixing of nanomaterial/water dispersion with cement using a conventional mixer.…”

Section: Dispersion Of Cnfs/cnts In Cementitious Matricesmentioning

confidence: 99%

A Review on Nanomaterial Dispersion, Microstructure, and Mechanical Properties of Carbon Nanotube and Nanofiber Reinforced Cementitious Composites

Parveen

Rana

Fangueiro

2013

Journal of Nanomaterials

318

151

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Excellent mechanical, thermal, and electrical properties of carbon nanotubes (CNTs) and nanofibers (CNFs) have motivated the development of advanced nanocomposites with outstanding and multifunctional properties. After achieving a considerable success in utilizing these unique materials in various polymeric matrices, recently tremendous interest is also being noticed on developing CNT and CNF reinforced cement-based composites. However, the problems related to nanomaterial dispersion also exist in case of cementitious composites, impairing successful transfer of nanomaterials' properties into the composites. Performance of cementitious composites also depends on their microstructure which is again strongly influenced by the presence of nanomaterials. In this context, the present paper reports a critical review of recent literature on the various strategies for dispersing CNTs and CNFs within cementitious matrices and the microstructure and mechanical properties of resulting nanocomposites.

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Section: Dispersion Of Cnfs/cnts In Cementitious Matricesmentioning

confidence: 99%

A Review on Nanomaterial Dispersion, Microstructure, and Mechanical Properties of Carbon Nanotube and Nanofiber Reinforced Cementitious Composites

Parveen

Rana

Fangueiro

2013

Journal of Nanomaterials

318

151

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“…If the initial bundles are not separated into single roots, then these MWCNTs aggregations may emerge later as matrix defects in the composites. In addition, it has been proved that the conventional concrete mixers cannot be used to disperse MWCNTs into cement paste directly [59]. To improve the dispersivity, MWCNTs are usually dispersed into water firstly, and then MWCNTs/water solution and cement particles are mixed using a conventional mixer.…”

Section: Dispersion Of Mwcntsmentioning

confidence: 99%

Progress in Research on Carbon Nanotubes Reinforced Cementitious Composites

Liu

2015

Advances in Materials Science and Engineering

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As one-dimensional (1D) nanofiber, carbon nanotubes (CNTs) have been widely used to improve the performance of nanocomposites due to their high strength, small dimensions, and remarkable physical properties. Progress in the field of CNTs presents a potential opportunity to enhance cementitious composites at the nanoscale. In this review, current research activities and key advances on multiwalled carbon nanotubes (MWCNTs) reinforced cementitious composites are summarized, including the effect of MWCNTs on modulus of elasticity, porosity, fracture, and mechanical and microstructure properties of cement-based composites. The issues about the improvement mechanisms, MWCNTs dispersion methods, and the major factors affecting the mechanical properties of composites are discussed. In addition, large-scale production methods of MWCNTs and the effects of CNTs on environment and health are also summarized.

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“…Therefore, various theoretical models that have been proposed are not accurate enough and can be applied only to a limited range of processes and cutting conditions. For these reasons, most researchers mainly use empirical research [17][18][19][20].…”

Section: Manufacturing Systemmentioning

confidence: 99%

Application of response surface methodology and fuzzy logic based system for determining metal cutting temperature

Tanikić¹,

Marinković²,

Manić³

et al. 2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The heat produced in metal cutting process has negative influence on the cutting tool and the machined part in many aspects. This paper deals with measurement of cutting temperature during single-point dry machining of the AISI 4140 steel, using an infrared camera. Various combinations of cutting parameters, i.e. cutting speed, feed rate and depth of cut lead to different values of the measured cutting temperature. Analysis of the measured data should explain the trends in temperature changes depending on changes in the cutting regimes. Furthermore, the temperature data is modelled using response surface methodology and fuzzy logic. The models obtained should determine the influence of cutting regimes on cutting temperature. The main objective is the reduction of cutting temperature, i.e. enabling metal cutting process in optimum conditions. Key words: machining, cutting temperature, infrared thermography, response surface methodology, fuzzy logic.Application of response surface methodology and fuzzy logic based system for determining metal cutting temperature Total amount of heat produced in metal cutting process can be calculated as a sum of heat produced by the three mentioned sources:where: Q -total amount of generated heat, Q S 1 -amount of heat generated by heat source S 1 , Q S 2 -amount of heat generated by heat source S 2 , Q S 3 -amount of heat generated by heat source S 3.The heat balance during metal cutting process can be expressed as follows:where: Q 1 -amount of heat carried away in the chips, Q 2 -amount of heat remaining in the cutting tool, Q 3 -amount of heat passing into the work-piece, Q 4 -amount of heat radiated to the surrounding air.

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Full factorial design analysis of carbon nanotube polymer-cement composites

Cited by 20 publications

References 11 publications

A Review on Nanomaterial Dispersion, Microstructure, and Mechanical Properties of Carbon Nanotube and Nanofiber Reinforced Cementitious Composites

A Review on Nanomaterial Dispersion, Microstructure, and Mechanical Properties of Carbon Nanotube and Nanofiber Reinforced Cementitious Composites

Progress in Research on Carbon Nanotubes Reinforced Cementitious Composites

Application of response surface methodology and fuzzy logic based system for determining metal cutting temperature

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