Influence of Sulphides on Hydration of Ground Granulated Slag Alkali Activated Mortars and Pastes

Abstract:

Influence of sodium sulphide on properties of sodium hydroxide activated ground granulated blast furnace slag was investigated. Properties of both fresh (cone flow, density) as well as hardened (compressive strength) mortars were determined. Early hydration of pastes was investigated using conducting calorimetry. Results showed, that introduction of sodium sulphide to caustic soda activated slag only slightly influence the course of hydration process. Early strength is increased by about 10%. In later periods strength is virtually not affected by the presence of sodium sulphide. Those observations are confirmed by calorimetric results. Presence of sodium sulphide causes slight decrease in consistency of mortars. Colour of mortars is also affected by the presence of sulphides. It is more darker and it is most probably due to the reducing properties of sulphide ions. Results of model investigations on precipitated C-S-H phase showed, that presence of sulphides results in increased main basal spacing of C-S-H phase as determined by XRD.

• Periodical: Key Engineering Materials (Volume 761)
• Pages: 92-95
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.761.92
• Online since: January 2018
• Authors: Łukasz Kotwica*, Ewa Kapeluszna, Piotr Stępień, Jan Deja, Mirja Illikainen, Łukasz Gołek
• Keywords: Alkali Activated Slag, Copper Mine Tailings, Geopolymer, Microstructure, Strength, Sulphide Mine Tailings, Sulphides

References

[1] K.J.D. Mackenzie, M. Welter, Geopolymer (aluminosilicate) composites: synthesis, properties and applications, Woodhead Publishing Limited, (2014).

[2] S. Wild, J.M. Kinuthia, G.I. Jones, D.D. Higgins, Effects of partial substitution of lime with ground granulated blast furnace slag (GGBS) on the strength properties of lime-stabilised sulphate-bearing clay soils, Eng. Geol. 51 (1998) 37–53.

DOI: 10.1016/s0013-7952(98)00039-8

[3] S. Song, D. Sohn, H.M. Jennings, T.O. Mason, Hydration of alkali-activated ground granulated blast furnace slag, J. Mater. Sci. 35 (2000) 249–257.

[4] R. Cioffi, L. Maffucci, L. Santoro, Optimization of geopolymer synthesis by calcination and polycondensation of a kaolinitic residue, Resour. Conserv. Recycl. 40 (2003) 27–38.

DOI: 10.1016/s0921-3449(03)00023-5

[5] I.G. Richardson, A.R. Brough, G.W. Groves, C.M. Dobson, The characterization of hardened alkali-activated blast-furnace slag pastes and the nature of the calcium silicate hydrate (C-S-H) phase, Cem. Concr. Res. 24 (1994) 813–829.

DOI: 10.1016/0008-8846(94)90002-7

[6] E. Barrie, V. Cappuyns, E. Vassilieva, R. Adriaens, S. Hollanders, D. Garcés, C. Paredes, Y. Pontikes, J. Elsen, L. Machiels, Potential of inorganic polymers (geopolymers) made of halloysite and volcanic glass for the immobilisation of tailings from gold extraction in Ecuador, Appl. Clay Sci. 109–110 (2015).

DOI: 10.1016/j.clay.2015.02.025

[7] D. Panias, I. Giannopoulou, The geopolymerization technology for the utilization of mining and metallurgical solid wastes, Proc. - Eur. Metall. Conf. EMC 2007. 2 (2007) 625–640.

[8] J. Kiventerä, Ł. Golek, J. Yliniemi, V. Ferreira, J. Deja, M. Illikainen Utilization of sulphidic tailings from gold mine as a raw material in geopolymerization, Int. J. Miner. Process. 149 (2016), 104-110.

DOI: 10.1016/j.minpro.2016.02.012

[9] F. Cihangir, B. Ercikdi, A. Kesimal, A. Turan, H. Deveci, Utilisation of alkali-activated blast furnace slag in paste backfill of high-sulphide mill tailings: Effect of binder type and dosage, Miner. Eng. 30 (2012) 33–43.

DOI: 10.1016/j.mineng.2012.01.009

[10] B. Ercikdi, A. Kesimal, F. Cihangir, H. Deveci, I. Alp, Cemented paste backfill of sulphide-rich tailings: Importance of binder type and dosage, Cem. Concr. Compos. 31 (2009) 268–274.

DOI: 10.1016/j.cemconcomp.2009.01.008

[11] J. Zhang, J.L. Provis, D. Feng, J.S.J. van Deventer, The role of sulfide in the immobilization of Cr(VI) in fly ash geopolymers, Cem. Concr. Res. 38 (2008) 681–688.

DOI: 10.1016/j.cemconres.2008.01.006

[12] F. Cihangir, B. Ercikdi, A. Kesimal, H. Deveci, F. Erdemir, Paste backfill of high-sulphide mill tailings using alkali-activated blast furnace slag: Effect of activator nature, concentration and slag properties, Miner. Eng. 83 (2015) 117–127.

DOI: 10.1016/j.mineng.2015.08.022

[13] E. Kapeluszna, Ł. Kotwica, A. Różycka, Ł. Gołek Incorporation of Al in C-A-S-H gels with various Ca/Si and Al/Si ratio: microstructural and structural characteristics with DTA/TG, XRD, FTIR and TEM analysis, submitted to Constr. Build. Mater. (2017).

DOI: 10.1016/j.conbuildmat.2017.08.091