Abstract
Influence of Nano-SiO2 (NS) addition on properties of Geopolymer materials has been studied through measurement of physicomechanical and morphological characteristics of the hardened specimens. Alumino–silicate materials are water-cooled slag, albite, kaolin, and metakaoline. Materials were prepared at water/binder ratios in a range of 0.244:0.320 for water-cooled slag based materials, while it increased to 0.46 for albite-based mixes, whereas the used activator sodium hydroxide is 10 wt.%. The control geopolymer mix has been composed of water-cooled slag, metakaoline, and kaolin in the ratio of (4:2:1). Albite used for comparison with slag to demonstrates the possibility of producing lightweight geopolymer binder. Nano-silica was added in the range from 0:3% from the total weight with 0.5% increment. Results indicated that, compressive strengths of geopolymer mixes incorporating NS were obviously higher than those of control one, specially at early ages as well as up on using 2.5% NS with the lowest percentage of water absorption; also uses of albite instead of slag results in formation of light binder with promising mechanical characteristics.
Highlights
Over recent years, there has been a rapid increase in the range of available nanomaterials and the number of companies that supply them
The main goal of the current paper is to study effect of nano-silica addition on the physicomechanical and microstructural features of the resulting geopolymer materials produced from various aluminosilicate precursors producing nontraditional cementing materials that can be applied in many building applications
Fourier transform infrared spectrometer (FTIR) spectra of 28 days hardened geopolymer specimens having various NS content are shown in Figure [3]
Summary
There has been a rapid increase in the range of available nanomaterials and the number of companies that supply them. Geopolymer binders are examples of non-traditional materials used in blended cements include those derived from pozzolans. Such use of geopolymer binders for building application is not a new concept – the use of pozzolans in construction had precedence in ancient civilization, less vulnerable to cracking. The scope of this paper is restricted to construction applications of geopolymer binders incorporating secondary input materials (volcanic ash, fly ash, and slags). The deployment of such products is advantageous in buildings, where durability, strength, and fired resistance are of primary concern
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