Synthesis of Silica Nanoparticles Modified with Alumina and Its Performance in Compressive Strength of Concrete

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Karbalaee, Omid | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47844 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Sajadi, Ali Akbar; Ghanbari, Bahram
Abstract:
Silica nanoparticles is one of the most important mineral particles. In this study, Sodium silicate, Sulfuric acid and Sodium aluminate is used in order to synthesis of the modified Silica nanoparticles. The effects of temperature, reaction time and the molar ratio of regents were tested and optimized. Synthesized nanoparticles were characterized by use of XRD, FT-IR and SEM techniques. The results show that by controlling the reaction conditions, nanoparticles with an average size of 26.2 nm is obtained. The increase of temperature and reaction time alters the structure of the particles of amorphous state to a crystalline needles. The particle surface modification process was performed by sodium alumina. Then the nanoparticle are employed in the manufacture of high-strength concrete. Concrete compressive strength tests indicate that 7-day compressive strength of concrete is increased up to 8.5% compared to control samples by addition of 1% w/w of silica nanoparticles to cement
Keywords:
Silica Nanoparticles ; Concrete ; Alumina ; Surface Modification ; Compression Strength

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