Projects per year
Abstract
Cementitious materials have a complex chemistry and naturally form nanostructures in the hydration process, a network of calcium silicate hydrates. It is considered that nanoparticles such as nanosilica could act as a pozzolanic material as well as a seeding agent for nucleation and acceleration of the formation of the calcium silicate hydrate network. This work evaluates the effect of nanosilica on the calcium silicate hydrate network and microstructure of hardened ternary, quaternary and quinary system Portland cement based pastes. The quinary system, containing Portland cement, limestone, fly ash, microsilica and nanosilica, and ternary combinations (Portland cement, limestone and fly ash) showed mean calcium/silicon atomic ratios of the calcium silicate hydrate gel in the 28 d old hardened paste of 1·2 and 2·3 respectively. Fourier transform infrared spectroscopy results show the presence of the bridging silicate tetrahedra (Q2) characteristic of a peak at around 980 cm−1 and a shoulder at around 1060 cm−1 in the calcium silicate hydrate gel network of the ternary, quaternary and quinary combinations; these bands are thus more pronounced for the nanosilica-enhanced formulations. The sample obtained in the presence of microsilica and nanosilica (quinary combination) showed evidence of a more intricate calcium silicate hydrate gel network (bridging tetrahedra) characteristic of a honeycomb-like structure opposed to the ternary combination (control sample).
Original language | English |
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Article number | 1300098 |
Pages (from-to) | 187-200 |
Number of pages | 14 |
Journal | Advances in Cement Research |
Volume | 27 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Apr 2015 |
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Dive into the research topics of 'Effects of nanosilica on the calcium silicate hydrates in Portland cement–fly ash systems'. Together they form a unique fingerprint.Projects
- 1 Finished
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FIBCEM
Paine, K. (PI), Calabria-Holley, J. (CoI) & Walker, P. (CoI)
1/12/11 → 30/11/14
Project: EU Commission
Profiles
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Juliana Calabria-Holley
- Department of Architecture & Civil Engineering - Senior Lecturer
- Centre for Nanoscience and Nanotechnology
- Centre for Regenerative Design & Engineering for a Net Positive World (RENEW)
- Centre for Integrated Materials, Processes & Structures (IMPS)
- Institute of Sustainability and Climate Change
Person: Research & Teaching, Core staff, Affiliate staff
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Kevin Paine
- Department of Architecture & Civil Engineering - Professor
- Centre for Climate Adaptation & Environment Research (CAER) - Centre Director
Person: Research & Teaching, Core staff