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A platform for research: civil engineering, architecture and urbanism
Quantitative microstructural characterisation of Portland cement‑carbon nanotube composites using electron and x-ray microscopy
https://orcid.org/0000-0002-8147-7673
Abstract Cementitious composites incorporating well-dispersed carbon nanotubes (CNTs) have demonstrated significant mechanical performance enhancements, however, there has only been limited investigation into the nanocomposite microstructure and pore structure. In this study, the effects of (i) CNT dispersion with and without the assistance of a dispersant, (ii) CNT dose at 0.05–0.25 wt% of cement, and (iii) CNT dispersion quality upon the composite microstructure after 7- and 28-days' hydration were investigated using quantitative image analysis of backscattered electron microscopy and X-ray computed microtomographic datasets. Results show that dispersed CNTs promoted the formation of low- and higher-density hydration products within 7 days of hydration and reduced the pore size distribution by 28 days, although 3D X-ray results showed some large CNT agglomerations formed in the nanocomposite. Further, poorly-dispersed CNTs increased the 28-day pore size distribution, but had a beneficial effect, similar to well-dispersed CNTs, upon the microstructural composition of the hydrated phases.
Quantitative microstructural characterisation of Portland cement‑carbon nanotube composites using electron and x-ray microscopy
https://orcid.org/0000-0002-8147-7673
Abstract Cementitious composites incorporating well-dispersed carbon nanotubes (CNTs) have demonstrated significant mechanical performance enhancements, however, there has only been limited investigation into the nanocomposite microstructure and pore structure. In this study, the effects of (i) CNT dispersion with and without the assistance of a dispersant, (ii) CNT dose at 0.05–0.25 wt% of cement, and (iii) CNT dispersion quality upon the composite microstructure after 7- and 28-days' hydration were investigated using quantitative image analysis of backscattered electron microscopy and X-ray computed microtomographic datasets. Results show that dispersed CNTs promoted the formation of low- and higher-density hydration products within 7 days of hydration and reduced the pore size distribution by 28 days, although 3D X-ray results showed some large CNT agglomerations formed in the nanocomposite. Further, poorly-dispersed CNTs increased the 28-day pore size distribution, but had a beneficial effect, similar to well-dispersed CNTs, upon the microstructural composition of the hydrated phases.
Quantitative microstructural characterisation of Portland cement‑carbon nanotube composites using electron and x-ray microscopy
https://orcid.org/0000-0002-8147-7673
Abstract Cementitious composites incorporating well-dispersed carbon nanotubes (CNTs) have demonstrated significant mechanical performance enhancements, however, there has only been limited investigation into the nanocomposite microstructure and pore structure. In this study, the effects of (i) CNT dispersion with and without the assistance of a dispersant, (ii) CNT dose at 0.05–0.25 wt% of cement, and (iii) CNT dispersion quality upon the composite microstructure after 7- and 28-days' hydration were investigated using quantitative image analysis of backscattered electron microscopy and X-ray computed microtomographic datasets. Results show that dispersed CNTs promoted the formation of low- and higher-density hydration products within 7 days of hydration and reduced the pore size distribution by 28 days, although 3D X-ray results showed some large CNT agglomerations formed in the nanocomposite. Further, poorly-dispersed CNTs increased the 28-day pore size distribution, but had a beneficial effect, similar to well-dispersed CNTs, upon the microstructural composition of the hydrated phases.
Quantitative microstructural characterisation of Portland cement‑carbon nanotube composites using electron and x-ray microscopy
MacLeod, Alastair J.N. (author) / Collins, Frank G. (author) / Duan, Wenhui (author) / Gates, Will P. (author)
2019-05-19
Article (Journal)
Electronic Resource
English
Microstructural investigation of deteriorated Portland cement concretes
| Online Contents | 1996
Microstructural investigation of deteriorated Portland cement concretes
| British Library Online Contents | 1996
Electrically Induced Microstructural Changes in Portland Cement Pastes
| British Library Online Contents | 1998
Electrically Induced Microstructural Changes in Portland Cement Pastes
| Online Contents | 1998