Effect of adding mineral additives to alkali-activated natural pozzolan paste |
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| Authors: | Dali Bondar CJ Lynsdale NB Milestone N Hassani AA Ramezanianpour |
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| Affiliation: | 1. University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK;2. Research Centre of Natural Disasters in Industry, Power and Water University of Technology (P.W.U.T.), Tehran, Iran;3. Dept. of Civil and Structural Engineering, University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK;4. Milestone and Associates Ltd, 5 Bedford Grove, Lower Hutt 5010, New Zealand;5. Dept. of Civil Engineering, Amir Kabir University, Tehran, Iran |
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| Abstract: | Natural pozzolans are raw materials from geological deposits with a range of chemical compositions that when combined with suitable alkali activators can be converted to geopolymer cement for concrete production. In this paper the concept of adding mineral additives to enhance the properties of geopolymer cement is introduced. Taftan andesite, a natural Iranian pozzolan, was used to study the effect of adding mineral additives such as kaolinite, lime and other calcined pozzolans on the compressive strength of geopolymer cement under both normal and autoclave curing. Scanning electron microscopy (SEM)/energy dispersive X-ray (EDX) was used to determine the composition of the gel phase in both alkali-activated Taftan pozzolan with and without mineral additions. The work has shown that deficiencies in SiO2, Al2O3 and CaO content in the raw natural pozzolan can be compensated for by adding mineral additives for enhanced properties. |
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