Title:
Effects of Sol-Gel Derived Nano-Silica Suspensions in Cement Paste
Author(s):
Dulani P. A. Kodippili, Ehsan Rezabeigi, Michelle R. Nokken, and Robin Drew
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
5.1-5.10
Keywords:
cement hydration, nano-silica, setting time, sol-gel
DOI:
10.14359/51701043
Date:
8/1/2017
Abstract:
One challenge of the use of nanoparticles in concrete has been agglomeration and dispersion. In this study, silica nanoparticles were synthesized via sol-gel using tetraethylorthosilicate (TEOS) as the precursor and ammonium hydroxide (NH4OH) as the gelation catalyst. The composition and particle size distribution of the resulting powder were examined by energy-dispersive X-ray spectroscopy (EDS) and particle size analysis (PSA), respectively. It was found that ammonium hydroxide delayed the setting time of cement, thus the suspension was
thoroughly rinsed with a solution of Ca(OH)2 in distilled water. The suspension of nanoparticles in Ca(OH)2 solution was directly incorporated into the cement and water mixture to make the cement paste. Setting time and heat of hydration of cement were compared for cement pastes with the nanoparticles as suspension, as dried particles and control specimens. Results indicate that direct incorporation of nano-silica as an aqueous suspension has potential benefits.
Related References:
1. S. Lesko et al., “Investigation by atomic force microscopy of forces at the origin of cement cohesion”. Ultramicroscopy 86(1–2), 2001, pp. 11-21.
2. J. S. Belkowitz. “The investigation of nano silica in the cement hydration”. Technology, 2000.
3. B. Jo et al. “Characteristics of cement mortar with nano-SiO2 particles”. Constr. Build. Mater. 21(6), 2007, pp. 1351-1355.
4. L. P. Singh et al., “Beneficial role of nanosilica in cement based materials-A review”. Constr. Build. Mater. 47, 2013. pp. 1069-1077. Available: http://www.sciencedirect.com/science/article/pii/S0950061813004509.
5. L. Singh et al. “Reduction of calcium leaching in cement hydration process using nanomaterials”. Mater. Technol. 27(3), 2012, pp. 233-238.
6. G. Quercia et al. “Characterization of morphology and texture of several amorphous nano-silica particles used in concrete”. Cement and Concrete Composites 44, 2013, pp. 77-92.
7. G. Shakhmenko, I. Juhnevica and A. Korjakins. “Influence of sol-gel nanosilica on hardening processes and physically-mechanical properties of cement paste”. Procedia Engineering 57, 2013, pp. 1013-1021.
8. H. Li et al., “Microstructure of cement mortar with nano-particles”. Composites Part B: Engineering 35(2), 2004, pp. 185-189.
9. A. M. Said et al., “Properties of concrete incorporating nano-silica”. Constr. Build. Mater. 36, 2012, pp. 838-844.
10. I. Flores et al., “Performance of cement systems with nano-SiO2 particles produced by using the sol-gel method”. Transportation Research Record: Journal of the Transportation Research Board (2141), 2010, pp. 10-14.
11. G. Quercia, G. Hüsken and H. Brouwers. “Water demand of amorphous nano silica and its impact on the workability of cement paste”. Cem. Concr. Res. 42(2), 2012, pp. 344-357.
12. I. A. Rahman and V. Padavettan., “Synthesis of silica nanoparticles by sol-gel: Size-dependent properties, surface modification, and applications in silica-polymer nanocomposites—a review”, Journal of Nanomaterials 2012, pp. 8. 2012.
13. K. Wang et al., “Developing a simple and rapid test for monitoring the heat evolution of concrete mixtures for both laboratory and field applications”, 2007.
14. H. Lee, H. Lee and J. Jeon., “Codeposition of micro-and nano-sized SiC particles in the nickel matrix composite coatings obtained by electroplating”, Surface and Coatings Technology 201(8), 2007, pp. 4711-4717.