Effect of Calcium Hydroxide Content on Pozzolanic Reaction of Calcined Clays: Their Mechanical Properties and Microstructures

Abstract:

The research aimed to investigate the effect of calcium hydroxide content on pozzolanic reaction of calcined clays. Pozzolanic reaction of calcined clay was determined in terms of its mechanical properties, phase development and microstructures. Three clay minerals (two kaolinitic clays and kaolinite-montmorillonite clay) were chosen to produce pozzolanic materials via calcination at temperature of 700 °C to allow dehydroxylation of clay minerals. Ratios of calcium hydroxide to calcined clays were varied from 0.1 to 0.5. Mixing water contents or liquid to solid ratios (0.62, 0.75 and 0.80) and curing times (7 and 28 days) were also studied. It was found that calcium aluminosilicate hydrate (stratlingite) could be formed after pozzolanic reactions of all clay minerals. The development of stratlingite agreed with the strength development showing the highest compressive strength at 26 MPa (28 days) when kaolinite-montmorillonite clay was used as pozzolanic material and the ratio of calcium hydroxide to calcined clay was 0.5.

• Periodical: Materials Science Forum (Volume 1034)
• Pages: 161-168
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1034.161
• Online since: June 2021
• Authors: Supaluk Suttikul*, Kanyarat Ano, Kedsarin Pimraksa
• Keywords: Kaolinite, Kaolinite-Montmorillonite, Metakaolin, Pozzolanic Reaction

References

[1] Hollanders, S., Adriaens, R., Skibsted, J., Cizer, Ö., & Elsen, J. (2016). Pozzolanic reactivity of pure calcined clays. Applied Clay Science, 132-133, 552–560.

DOI: 10.1016/j.clay.2016.08.003

[2] Boonjaeng, S., Chindaprasirt, P., & Pimraksa, K. (2014). Lime-calcined clay materials with alkaline activation: Phase development and reaction transition zone. Applied Clay Science, 95, 357–364.

DOI: 10.1016/j.clay.2014.05.002

[3] AlejandraTironi, Monica A.Trezza, Alberto N.Scian, Edgardo F.Irassar. (2013). Assessment of pozzolanic activity of different calcined clays. Cement & Concrete Composites 37 (2013) 319–327.

DOI: 10.1016/j.cemconcomp.2013.01.002

[4] Boonserm, K., Sata, V., Pimraksa, K., Chindaprasirt, P., 2012. Improved geopolymerization of bottom ash by incorporating fly ash and using waste gypsum as additive. Cem.Concr. Compos. 34 (7), 819–824.

DOI: 10.1016/j.cemconcomp.2012.04.001

[5] Konan, K. L., Peyratout, C., Smith, A., Bonnet, J.-P., Rossignol, S., & Oyetola, S. (2009). Comparison of surface properties between kaolin and metakaolin in concentrated lime solutions. Journal of Colloid and Interface Science, 339(1), 103–109.

DOI: 10.1016/j.jcis.2009.07.019

[6] Rodrigo Fernandez, Fernando Martirena, Karen L. Scrivener. (2011). The origin of the pozzolanic activity of calcined clay minerals: A comparison between kaolinite, illite and montmorillonite. Cement and Concrete Research 41 (2011) 113–122.

DOI: 10.1016/j.cemconres.2010.09.013

[7] Hernan Yanguatin, Jose H. Ramírez, Alejandra Tironi, Jorge I. Tobón. (2019). Effect of thermal treatment on pozzolanic activity of excavated waste clays. Construction and Building Materials 211 (2019) 814–823.

DOI: 10.1016/j.conbuildmat.2019.03.300

[8] Johnson, C. A. (2004). Cement stabilization of heavy-metal-containing wastes. Geological Society, London, Special Publications, 236(1), 595–606.

DOI: 10.1144/gsl.sp.2004.236.01.33