Porous, Sintered Glass‐Ceramics from Inorganic Polymers Based on Fayalite Slag

Abstract

The present paper deals with the synthesis of porous, sintered glass-ceramics obtained at temperatures below 1150°C, originating from inorganic polymers based on fayalite slag. Firing led to the evaporation of water, dehydroxylation, and oxidation of Fe2+ above 345°C. For heating >700°C, the Si-O stretching band shifted from the 1160 and 750 cm-1 to the 1255 and 830 cm-1 region, due to a structural reorganization of the amorphous phase, whereas Fe-O bands appeared at 550 cm-1. The final microstructure consisted predominantly of an amorphous phase, hematite, and franklinite. The open porosity and compressive strength decreased and increased, respectively, as the firing temperature increased. The final values suggest properties comparable to that of structural lightweight concrete, still, the materials synthesized herein, are lighter, and made primarily from secondary resources

Assessment of Alkali Activation Potential of a Polish Ferronickel Slag

“…The peak seen at The FTIR spectra of raw PS and selected IPs are shown in Figure 7. In line with the XRD data, the spectrum of the raw PS presents the characteristic peaks of Ca-Fe-Mg-silicate-based slags dominated by fayalite, diopside and hedenbergite, with bands seen at 828 cm −1 , 872 cm −1 and 948 cm −1 [45,46,[51][52][53]. The first band results from the v1 mode (symmetric stretch), while the others correspond to the asymmetric stretching vibrations of SiO 4 (v3 mode).…”

The fate of iron during the alkali‐activation of synthetic (CaO‐)FeOx‐SiO2 slags: An Fe K‐edge XANES study

“…Recently, iron silicate precursors such as slags originating from the nonferrous metals industry have been proposed as alternative precursors for alkali‐activated materials . These slags are currently used mainly as aggregate for concrete or asphalt, as fill or in other low added value applications .…”

Gamma exposure from building materials – A dose model with expanded gamma lines from naturally occurring radionuclides applicable in non-standard rooms

“…A decrease of 4.5 % is observed in the DA of 235 U decay series when using the weighted 43 average gamma lines in comparison to its non-averaged variant. The sensitivity of the EGDA 44 model for density, wall thickness, presence of windows and doors and room size is 45 investigated. Finally, a comparison of the index and dose calculations relevant for the dose 46 assessment within the European legislative framework applicable towards building materials 47 is performed.…”