macleod-durabilitycharacterisation-2020.pdf (1.61 MB)
Durability characterisation of portland cement–carbon nanotube nanocomposites
journal contribution
posted on 2020-09-01, 00:00 authored by Alastair MacLeodAlastair MacLeod, Will GatesWill Gates, Frank CollinsFrank CollinsMultiwalled carbon nanotubes have outstanding mechanical properties that, when combined with Portland cement, can provide cementitious composites that could lead to the innovative construction of stronger, lighter, and thinner built infrastructure. This paper addresses a knowledge gap that relates to the durability of CNT–cement composites. The durability to corrosive chloride, uptake of water by sorption, and flow of the permeability of water acting under high water pressure are addressed. Flow simulations were undertaken through segmented 3D pore networks, based on X-ray computed microtomography measurements, the creation of a virtual microstructure, and fluid simulations that were compared with larger-scale samples. The investigation showed decreased water sorptivity of CNT–cement mixtures, indicating improved durability for the cover zone of concrete that is prone to the uptake of water and water-borne corrosives. Chloride diffusion of CNT–cement composites provided up to 63% improvement compared with control samples. The favourable durability bodes well for the construction of long-life CNT-reinforced concrete infrastructure.
History
Journal
MaterialsVolume
13Issue
18Article number
4097Pagination
1 - 22Publisher
MDPILocation
Basel, SwitzerlandPublisher DOI
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ISSN
1996-1944eISSN
1996-1944Language
EnglishPublication classification
C1 Refereed article in a scholarly journalUsage metrics
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Science & TechnologyPhysical SciencesTechnologyChemistry, PhysicalMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringPhysics, AppliedPhysics, Condensed MatterChemistryMaterials SciencePhysicscarbon nanotubespermeabilityX-ray computed microtomographychloride diffusionsorptivitydurabilityCALCIUM SILICATE HYDRATETRANSPORT-PROPERTIESMICROSTRUCTUREBEHAVIORMODELCNTDISTRIBUTIONSSIMULATION
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