Thermophysical Properties of Metakaolin Geopolymers Based on Na₂SiO₃/NaOH Ratio

Abstract:

In the present work, the effect of different sodium silicate-to-sodium hydroxide ratio on the physical, mechanical and thermophysical properties of metakaolin geopolymers (MkGPs) was investigated. Geopolymers were prepared by activating the metakaolin with a mixture of NaOH and sodium silicate (Na₂SiO₃). The products obtained were characterized after 28 days of ageing. The density, porosity, compressive strength, thermal conductivity (TC), thermal diffusivity and specific heat capacity were determined. In general, the Na₂SiO₃/NaOH ratio has a significant effect on the compressive strength of the MkGPs. The thermal conductivity, thermal diffusivity and specific heat of MkGps measured in this work were in the range between 0.44 to 0.92 W/mK, 0.22 to 0.44 mm²/s and 1 to 3.7 MJ/m³K respectively. The highest compressive strength was 32 MPa achieved with Na₂SiO₃/NaOH ratio of 1.0. This mix has the best thermophysical performance due to low thermal conductivity, low thermal diffusivity and high specific heat compared to the other alkaline activator ratios. The results showed that the geopolymer is able to be used as the thermal insulating material.

• Periodical: Solid State Phenomena (Volume 280)
• Pages: 487-493
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.280.487
• Online since: August 2018
• Authors: Ain Jaya Nur, Y.M. Liew, A.M. Mustafa Al Bakri, C.Y. Heah
• Keywords: Geopolymer, Metakaolin, Thermal Conductivity

References

[1] J.Davidovits: J. Therm Anal. Vol. 37 (1991) pp.1633-1656.

[2] T.Bakharev: Cement Concrete Res. Vol 36 (2006) pp.1134-1147.

[3] F.A.C. Milheiro, M.N. Freire, A.G.P. Silva, and J.N.F. Holanda: Ceramics International Vol 31 (2005) pp.757-763.

DOI: 10.1016/j.ceramint.2004.08.010

[4] P. Duxson, A.Fernandez-Jimenez, J.L. Provis, G.C. Lukey, A. Palomo, and J.S.J.v. Deventer: J. Mater. Sci. Vol 42 (2007) pp.2917-2933.

DOI: 10.1007/s10853-006-0637-z

[5] D.Hardjito and B.V. Rangan: J. Struct. Eng. Vol 6 (2005) pp.1-9.

[6] G. Kovalchuk and P.V. Krivenko: Geopolymers: Structure,processing, properties and industrial application (Woodhead Publishing Limited, UK 2009).

[7] J.G.S.v.Jaarsveld and J.S.J.v.Deventer: Miner Eng Vol 10 (1996) pp.659-669.

[8] R.Brooks, M.Bahadory, F.Toviac, and H.Rostami: Intl. J. Sustain. Eng International Vol 3 (2010) p.211–218.

[9] R.Demirboga: Build Environ Vol 42 (2007) p.2467–2471.

[10] E.Kamseu, B.Nait-Ali, M.C. Bignozzi, C.Leonelli, S.Rossignol, and D.S. Smith: J Eur Ceram Soc Vol 32 (2010) p.1593–1603.

[11] J.Feng, R.Zhang, L.Gong, Y.Li, W.Cao, and X.Cheng: Mater Design Vol 65 (2015) p.529–533.

[12] E.Kamseu, B.Ceron, H.Tobias, E.Leonelli, M.C. Bignozzi, A.Muscio, and A.Libbra: J Therm Anal Calorim Vol 108 ( 2012) pp.1189-1199.

DOI: 10.1007/s10973-011-1798-9

[13] P.Duxson, G.C. Lukey, and J.S.J.v.Deventer: J. Non-Cryst. Solids Col 352 (2006) pp.5541-5555.

[14] E.Kamseu, Z.N.M.N. Gouloure, B.N. Ali, S.Zekeng, U.C. Melo, S.Rossignol, and C.Leonellic: Energy Build. Vol 88 (2015) p.45–56.

[15] H.Wang, W.D. Porter, H.Bottner, J.Konig, L.Chen, S.Bai, T.M. Tritt, A.Mayolet, J.Senawiratne, C.Smith, F.Harris, P.Gilbert, J.Sharp, J.Lo, H.Kleinke, and L.Kiss: J. Electron. Mater. Vol 42 (2013) p.46.

DOI: 10.1007/s11664-013-2516-0

[16] A.C. Institute, Building Code Requirements for Structural Concrete (ACI 318M-11) and Commentary. 2011: Farmington Hills, Michigan.

[17] S.Hanjitsuwan, S.Hunpratub, P.Thongbai, S.Maensiri, V.Sata, and P.Chindaprasirt: Cem. Concr. Res. Vol 45 (2014) pp.9-14.

DOI: 10.1016/j.cemconcomp.2013.09.012

[18] Z.Yahya, M.M.A.B. Abdullah, K.Hussin, K.N. Ismail, R.A. Razak, and A.V. Sandu: Materials Vol 8 ( 2015) pp.2227-2242.

[19] P.Duxson, G.C. Lukey, and J.S.J.v.Deventer: Ind. Eng. Chem. Res. Vol 45 ( 2006) pp.7781-7788.

[20] Y.M. Liew, H. Kamarudin, A.M.M.A. Bakri, M. nhussain, M. Luqman, I.K. Nizar, C.M. Ruzaidi, and C.Y. Heah: Constr Build Mater Vol 37 (2012) pp.440-451.

DOI: 10.1016/j.conbuildmat.2012.07.075