Abstract
The objective of this study is to evaluate the effect of limestone powder as a filler material on the fresh and hardened properties of early-age geopolymer. The geopolymer was prepared by alkali activating metakaolin added with limestone filler from 10 % to 30 % by weight. It was found that the incorporation of limestone powder improved the fluidity and strength. 10 % addition of limestone powder increased 17.43 % and 14.36 % of the 7d compressive and flexural strength respectively, and the sample with 15 % addition improved the fluidity of fresh geopolymer distinctly. The mechanism of limestone powder as filler material on the enhancement of properties of geopolymer was investigated by using X-ray diffraction analysis and scanning electron microscopy. The delayed formation of amorphous products with an increased prominence of calcite and a more compacting structure were observed from the XRD and SEM results. Thus the rheology property and the strength development were both promoted due to a better particle size distribution as the extra LS was added.
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Acknowledgments
Authors appreciate the financial supports from the China Postdoctoral Science Foundation under the contract No. 2013M531296, and the Postdoctoral Science Foundation of Jiangsu Province under the contract No. 1301160C).
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Qian, J., Song, M. (2015). Study on Influence of Limestone Powder on the Fresh and Hardened Properties of Early Age Metakaolin Based Geopolymer. In: Scrivener, K., Favier, A. (eds) Calcined Clays for Sustainable Concrete. RILEM Bookseries, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9939-3_31
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DOI: https://doi.org/10.1007/978-94-017-9939-3_31
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Publisher Name: Springer, Dordrecht
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Online ISBN: 978-94-017-9939-3
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