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.com
Volume 5, Issue 6 (Suppl)
J Mat. Sci.
ISSN: 2321-6212
Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13
TH
INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
Performant cement based materials reinforced with nano-SiO
2
Mihaela-Andreea Moncea, Florina-Diana Dumitru, Marius Viorel Olteanu, Madalina Boboc and Gyorgy Deak
National Institute for Research and Development in Environmental Protection, Romania
T
he paper presents the investigation of the effect of SiO
2
nanoparticles on the mechanical properties and microstructure
of cement based materials. For this purpose nano-SiO
2
powders were obtained by sol-gel method using different molar
ratios of TEOS/ethanol/water. The formation of nano-SiO
2
particles was confirmed by X-ray fluorescence analyses (XRF)
and the nanometric sizes by scanning electron microscopy (SEM). The cement based materials admixture were obtained by
using 0.45 and 0.5 water/binder ratio (w/b) and for each ratio the cement was substituted with 0.5 of 0.7% of nano-SiO2. The
distribution of nano-SiO
2
particles within the cement matrix plays an essential role and governs the performance of these
products. Therefore, the addition of 0.4% super-plasticizer for the w/b=0.45 was proposed to facilitate the distribution of
nano-SiO
2
particles. The mechanical test results showed that after 7 days of hydration the cement based materials with 0.7%
nano-SiO
2
content improved the compressive strengths compared with those of the etalon (E=45MPa Vs. AM1=55MPa). The
microstructure of cement based admixtures highlighted the presence of Ca(OH)
2
, ettringite and calcium silicate hydrates as
well as nano-SiO
2
particles embedded into the cement matrix.
Biography
Mihaela-Andreea Moncea has completed her PhD from Politehnica University of Bucharest. She is a Senior Researcher at the National Institute for research and
development in environmental protection, within the impact of built environment and Nano-materials Department. She has published more than 30 papers and is
serving as Reviewer of specialized ISI journal in the materials science field.
andreea.moncea@incdpm.roMihaela-Andreea Moncea et al., J Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-009