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Physicochemical and Microstructural Characterizations of Alkali-Activated Binder Systems

Arkamitra Kar 1, Indrajit Ray 2, Udaya B. Halabe 3, and Avinash Unnikrishnan 4
1. Department of Civil Engineering, BITS-Pilani, Hyderabad Campus, Hyderabad – 500078, India
2. Department of Civil and Environmental Engineering, Faculty of Engineering, The University of the West Indies, St Augustine, Trinidad and Tobago
3. Department of Civil and Environmental Engineering, West Virginia University, Morgantown, WV 26506, USA
4. Department of Civil and Environmental Engineering, Portland State University, Portland, OR, USA 97201 USA

Abstract—Alkali-Activated Binder (AAB) is being considered as a sustainable and greener alternative to portland cement binder due to their low carbon dioxide footprint and effective byproducts/waste better recycling capacity. For better understanding of AAB behavior the present study has conducted a number of physicochemical and microstructural characterizations of ten different combinations of AAB containing fly ash and/or slag at three different curing conditions. Results revealed the presence of Si-O-Si bonds, Si-O-Al bonds, and sodium aluminosilicate for pure fly ash based AAB. Ca2+ ions and calcium silicate hydrate were present under the influence of slag. This information will help in estimation of volume fractions of different AAB mixtures from microanalysis data. 
 
Index Terms—alkali-activated binder, degree of reaction, FTIR, isothermal calorimetry, SEM/EDS, XRD

Cite: Arkamitra Kar, Indrajit Ray, Udaya B. Halabe, and Avinash Unnikrishnan, "Physicochemical and Microstructural Characterizations of Alkali-Activated Binder Systems," International Journal of Structural and Civil Engineering Research, Vol. 5, No. 2, pp. 119-129, May 2016. doi: 10.18178/ijscer.5.2.119-129

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