|
|
|
Title: Small Changes Can Make a Great Difference
Accession Number: 01157591
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Four different types of commercially available silica nanoparticles were added to ordinary portland cement pastes to study their effects. The subsequent multiscale characterization of the material revealed that the addition of the nanoparticles induced a pozzolanic reaction that increased the amount of calcium silicate hydrate (C-S-H) gel in the paste to the detriment of portlandite. This had important implications for the hydration kinetics and the microstructure of the paste, including an increase in the initial hydration rate. A reduction of the overall porosity was also observed. The C-S-H gel of the pastes with nanosilica also showed some particular features, such as greater aluminum content and longer silicate chains. This was especially relevant because nanoindentation measurements and atomistic calculations showed that this was bound to an improvement in the mechanical properties of the C-S-H gel itself. Finally, the sum of all these factors resulted in pastes with 30% more compressive strength, which proved that, effectively, small changes can make a great difference.
Monograph Title: Monograph Accession #: 01157583
Report/Paper Numbers: NANO10-0019
Language: English
Authors: Gaitero, Juan JCampillo, IgorMondal, ParamitaShah, Surendra PPagination: pp 1-5
Publication Date: 2010
ISBN: 9780309142762
Media Type: Print
Features: Figures
(6)
; References
(26)
; Tables
(2)
TRT Terms: Uncontrolled Terms: Subject Areas: Materials; I32: Concrete
Files: TRIS, TRB
Created Date: May 24 2010 2:58PM
More Articles from this Serial Issue:
|
