Nanoscale Modification of Cementitious Materials

Shah, Surendra P.; Konsta-Gdoutos, Maria S.; Metaxa, Zoi S.; Mondal, Paramita

doi:10.1007/978-3-642-00980-8_16

Cited by 107 publications

(68 citation statements)

References 12 publications

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“…This remains the challenge for high performance composite applications [18][19][20][21]. Many studies in the recent past have demonstrated the compatible dispersion, surface functionalization, andchanges in surface energy of the nanotube with the goal oftapping the tremendous potential of CNTs as a reinforcing material for high performance cementitious composites [11,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Hydration Phenomena of Functionalized Carbon Nanotubes (CNT)/Cement Composites

Balasubramaniam

Mondal

Ramasamy

et al. 2017

Fibers

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Abstract:The exciting features of carbon nanotubes (CNTs), such as high elastic modulus, high thermal and electrical conductivities, robustness, and nanoscopic surface properties make them attractive candidates for the cement industry. They have the potential to significantly enhanceengineering properties. CNTs play an important and critical role as nano-anchors in concrete, which enhance the strength by bridging pores in the composite matrix, thereby ensuring robust mechanical strength. The diameter, dispersion, aspect ratio, and interfacial surface interaction of CNTs affect the physical and mechanical properties of concrete, if due care is not taken. In this paper, the usable amount of CNT is scaled down considerably from 0.5% to 0.025% by weight of the cement and the fluctuation caused by these phenomena is assessed. It is observed that the properties and exact quantities of incorporated CNTs influence the hydration and consistency of the composites. In order to address these issues, the surface functionalization of CNTs and rheological studies of the composites are performed. The hydration products and functional groups are carefully optimized and characterized by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and a Zeta potential analyzer. For Mixes 6 and 7, the compressive and tensile strength of CNTs incorporated in mortar specimens caused 77% and 48% increases in split tensile strength, respectively, and 17% and 35% increases in compressive strength, respectively, after 28 days of curing and compared withthe control Mix.

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Section: Introductionmentioning

confidence: 99%

Hydration Phenomena of Functionalized Carbon Nanotubes (CNT)/Cement Composites

Balasubramaniam

Mondal

Ramasamy

et al. 2017

Fibers

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“…These aggloromates decrease the linkage of nano particles with the binding phase of concrete. In order to enhance the bonding and to increase the nano materials dispersion, it is recommended to add super plasticiser, and ultrasonification [8,[18][19][20]. Vishwakarma et al (2016) [4] used nano-particles size (~50-70 nm) of Rice Husk Ash (RHA) agricultural waste as a partial replacement of Ordinary Portland Cement.…”

Section: Nano-materials In Concrete Mixturesmentioning

confidence: 99%

The Role of Nano-Technology in Sustainable Construction: A Case Study of Using Nano Granite Waste Particles in Cement Mortar

Bakhoum¹,

Garas²,

Allam³

et al. 2017

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Abstract. Better understanding of the properties of cement-based materials, one of the most widely used building materials, at the nano-scale is crucial to improve its functionality in the built environment. This paper presents areas of using nano-materials in improving the characteristics of cement-based materials as well as introducing a new role of nanotechnology together with waste management in enhancing the concept of sustainable construction.A case study on the use of nano-granite waste particles as a replacement of cement and fine aggregate in mortar production is presented.The research concluded that replacing 5% cement and 10% sand with nano-granite waste in the mortar mix increased the compressive strength of the green mortar by 41% compared to that of the control mix (CM). SEM images reinforced this result as the green mortar mix showed maximum density and minimum micro cracks and number of pores.A comparative study between the green mortar and traditional mortar was carried out using sustainability indicators to examine the environmental, social and economic implications. The environmental and social attributes showed a saving of 10% in the field of resource consumption, whereas savings in energy consumption and CO2 emissions reached 5%. The economic field showed saving of 6.5% indicating promising results in enhancing the sustainable construction industry.

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“…In particular, the superior electrical and mechanical properties of nanoengineered powders, such as nanotubes and nanofibers, has resulted in several demonstrations of conductive cementitious materials with excellent sensing capabilities [1,2]. Such materials offer great promise at the monitoring of large- 2 of 18 scale systems, or mesosystems, because they can form large-scale structural components comprising an infinite set of mechanically robust sensors that can be used to measure static and dynamic strain, from which strain-based and vibration-based structural health monitoring (SHM) can be conducted [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Among other carbon-based fillers [15,16], carbon nanotubes (CNTs) showed promise for several applications [17][18][19][20][21]. For example, such particles can be used to provide conductive capability to insulating materials, leading to the creation of self-sensing materials [22,23]. Self-sensing materials find great potential in the field of SHM.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Static and Dynamic Strain Sensitivity of Smart Concrete Sensors Doped with Carbon Nanotubes for SHM of Large Structures

Meoni¹,

D’Alessandro²,

Downey³

et al. 2018

Preprint

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Abstract:The availability of new self-sensing cement-based strain sensors allows the development of dense sensor networks for Structural Health Monitoring (SHM) of reinforced concrete structures. These sensors are fabricated by doping cement-matrix materials with conductive fillers, such as Multi Walled Carbon Nanotubes (MWCNTs), and can be embedded into structural elements made of reinforced concrete prior to casting. The strain sensing principle is based on the multifunctional composites outputting a measurable change in their electrical properties when subjected to a deformation. Previous work by the authors was devoted to material fabrication, modeling and applications in SHM. In this paper, we investigate the behavior of several sensors fabricated with and without aggregates and with different MWCNTs content. The strain sensitivity of the sensors, in terms of fractional change in electrical resistivity for unit strain, as well as their linearity are investigated through experimental testing under both static and dynamically varying compressive loadings. Moreover, the responses of the sensors when subjected to destructive compressive tests are evaluated. Overall, the presented results contribute to improving the scientific knowledge on the behavior of smart concrete sensors and to furthering their understanding for SHM applications.

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Nanoscale Modification of Cementitious Materials

Cited by 107 publications

References 12 publications

Hydration Phenomena of Functionalized Carbon Nanotubes (CNT)/Cement Composites

Hydration Phenomena of Functionalized Carbon Nanotubes (CNT)/Cement Composites

The Role of Nano-Technology in Sustainable Construction: A Case Study of Using Nano Granite Waste Particles in Cement Mortar

An Experimental Study on Static and Dynamic Strain Sensitivity of Smart Concrete Sensors Doped with Carbon Nanotubes for SHM of Large Structures

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