Low temperature depolymerization and polycondensation of a slag-based inorganic polymer. Issue 12 (15th August 2017)

• Record Type: Journal Article
• Authors: Wang, Kaituo; Lemougna, Patrick N.; Tang, Qing; Li, Wei; He, Yan; Cui, Xuemin
• Is Part Of: Ceramics international. Volume 43:Issue 12(2017)
• Page Start: 9067
• Page End: 9076
• Publication Date: 2017-08-15
• Subjects: A: Powders: solid state reaction -- C: Impedance -- Strength -- D: Silicate -- E: Thermal applications; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.04.052
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this paper, the depolymerization and polycondensation process, compressive strength, gel content and conductance of an alkali-activated slag (AAS) (an inorganic polymer or high-calcium geopolymer) paste cured at low temperature (−25 °C~25 °C) were studied. The results showed that gel content of the AAS inorganic polymer sample first increased and then decreased with the decreasing of the curing temperature for 24 h, reaching a maximum value of 37.8 wt% in the samples cured at 0 °C. Chemical structural data are obtained by nuclear magnetic resonance (NMR) spectroscopy for 6-coordinated (octahedral) aluminum can be observed at low temperature (<0 °C) and the gel contains primarily Q1 (1Al), Q2 (1 Al) and Q3 at 0 °C. The inductively coupled plasma emission spectrometry (ICP) analysis of the products showed depolymerization of a great amount of slag at low temperature. The impedance analysis indicated that low temperature (＜0 °C) will inhibit the polycondensation process but almost not affect the depolymerization process so as to make a distinction between the depolymerization and polycondensation process in the AAS inorganic polymer system.