Pressure-sensitive properties and microstructure of carbon nanotube reinforced cement composites

Li, Geng Ying; Wang, Pei Ming; Zhao, Xiaohua

doi:10.1016/j.cemconcomp.2006.12.011

Cited by 496 publications

(221 citation statements)

References 17 publications

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“…Few attempts have been made to add CNTs in cementitious matrices at an amount ranging from 0.5 to 2.0% by weight of cement. Previous studies have focused on the dispersion of CNTs in liquids by pre-treatment of the nanotube's surface via chemical modification [2][3][4][5][6][7][8]. Preliminary research has shown that small amounts of CNTs can be effectively dispersed in cementitious matrix [13].…”

Section: Introductionmentioning

confidence: 99%

“…However, cement matrix exhibits flaws which are at the nanoscale. The development of new nanosized fibers, such as carbon nanotubes (CNTs), has opened a new field for nanosized reinforcement within concrete [2][3][4][5][6][7][8]. The remarkable mechanical properties of CNTs [9][10] suggest that are ideal candidates for high performance cementitious composites.…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale Modification of Cementitious Materials

Shah

Konsta-Gdoutos

Metaxa

et al. 2009

Nanotechnology in Construction 3

107

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Abstract. This research investigates changes in the nanostructure and the nanoscale local mechanical properties of cement paste with micro-and nano-modifiers. Silica fume and multiwall carbon nanotubes (MWCNTs) were used as micro-and nano-modifiers. An effective method of dispersing CNTs in cement matrix was developed. A detailed study on the effects of CNTs concentration and aspect ratio on the fracture properties, nanoscale properties and microstructure of nanocomposite materials, was conducted. Significant improvements on the macro and nanomechanical properties of cement paste were observed with the incorporation of CNTs. Results suggest that CNTs can strongly modify and reinforce the cement paste matrix at the nanoscale.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoscale Modification of Cementitious Materials

Shah

Konsta-Gdoutos

Metaxa

et al. 2009

Nanotechnology in Construction 3

107

View full text Add to dashboard Cite

show abstract

“…Damage or stain affects the bulk conductivity to decrease, as reported for damage in the elastic regime [29], plastic (inelastic) deformation region [30,31] and after complete fracture [30]. Other researchers used carbon nanotubes instead of carbon fibre in cement for strain sensing applications and reported electrical conductivities decreasing upon tension [23] and increasing upon compression [24][25][26][27]. Luo et al prepared hybrid cement composites using carbon whiskers and carbon nanotubes and reported superior sensing than the use of carbon nanotube as the sole conductive admixture [28].…”

Section: Structural Health Monitoring (Shm) Is a Type Of A Non-destrumentioning

confidence: 99%

“…Classifying cement as ceramics, damage sensing has been achieved in various studies with the incorporation of short carbon whiskers [20][21][22]. For cement composites with conductive fillers, self-sensing is made attainable by the damage and/or strain on the volume electrical conductivity of damaged or strained material [20][21][22][23][24][25][26][27][28]. Damage or stain affects the bulk conductivity to decrease, as reported for damage in the elastic regime [29], plastic (inelastic) deformation region [30,31] and after complete fracture [30].…”

Section: Structural Health Monitoring (Shm) Is a Type Of A Non-destrumentioning

confidence: 99%

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Bhat

Daoush

2014

Ceramics International

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractA novel method for analysing structural health of alumina nanocomposites filled with graphene nanoplatelets (GNP), carbon nanotubes (CNTs) and carbon black nano-particles (CB) is presented. All nanocomposites were prepared using novel colloidal processing and then by Spark Plasma Sintering.Good homogeneous dispersion was observed for all carbon filled materials. Nanocomposite bars were indented to produce sub-surface damage. Change in electrical conductivities were analysed after indentation to understand structural damage. For correlating change in electrical conductivity and Page 2 of 15 indentation damage and understanding damage tolerance, mechanical properties were compared.Because of the systematically induced indentation damage, a sharp decrease of 86% was observed in the electrical conductivity of CNT nanocomposite as compared to 69% and 27% in the electrical conductivities of GNP nanocomposites and CB nanocomposites respectively. CNTs impart superior damage sensing capability in alumina nanocomposites, in comparison to GNP and CB, due to their fibrous nature, high aspect ratio and high electrical conductivity.

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“…First they can act as structural components with a reinforcing effect. A good example of this type of behaviour is carbon nanotubes [5] [6]. A second set of mechanisms is the effects with their surface.…”

Section: Introductionmentioning

confidence: 99%

Spray-Dry Agglomerated Nanoparticles in Ordinary Portland Cement Matrix

Vehmas¹,

Kanerva²,

Holt³

2014

MSA

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Nano-sized particles have got a focus of great interest for the past decade. These ultrafine particles can have an effect in multiple ways on concrete technology. Although most of the effects of nanoparticles are desired, a huge surface area introduced by nanoparticles also incorporates negative effects, such as loss of workability and safety aspects. Agglomeration of nano-sized particles by spray-drying is one potential method to overcome the negative effects. In this study, ultra-fine material was dispersed and agglomerated successfully. Agglomerate structure was analyzed and performance was evaluated with mortar samples. Agglomerated nano-sized material had micronsized inner porosity, which enabled water penetration into the agglomerates. In water exposure, agglomerates did not dissolve although some of binder glue and dispersing agent leaked out. Water penetration and organic material leaking enabled high reactivity and workability of the agglomerated nanoparticles. In spite of the high reactivity of agglomerated nanoparticles, slightly lower final compression strengths were observed with agglomerated ultrafine particles. The results of this study can be used in concrete technology when further developing admixture technologies and recipe designs. The negative side-effects of the agglomerated nanoparticles can be overcome and accounted for within application areas.

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Pressure-sensitive properties and microstructure of carbon nanotube reinforced cement composites

Cited by 496 publications

References 17 publications

Nanoscale Modification of Cementitious Materials

Nanoscale Modification of Cementitious Materials

Structural health monitoring capabilities in ceramic–carbon nanocomposites

Spray-Dry Agglomerated Nanoparticles in Ordinary Portland Cement Matrix

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