Greening effect in slag cement materials. (November 2017)

• Record Type: Journal Article
• Authors: Le Cornec, Domitille; Wang, Qirong; Galoisy, Laurence; Renaudin, Guillaume; Izoret, Laurent; Calas, Georges
• Is Part Of: Cement & concrete composites. Volume 84(2017)
• Page Start: 93
• Page End: 98
• Publication Date: 2017-11
• Subjects: Ground granulated blast-furnace slag (GGBS) -- Cement -- Concrete -- Coloration -- Polysulfides -- Diffuse reflectance spectroscopy; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2017.08.017
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: This article presents the first spectroscopic data describing the processes responsible for the temporary blue-green coloration that forms during the hydration of various materials containing Ground Granulated Blast-furnace Slag (GGBS) under anoxic conditions. UV-visible-near infrared Diffuse Reflectance (DR) spectra demonstrate a striking similarity of the coloring center forming during the curing of a broad range of GGBS-bearing materials (pure GGBS with different compositions, mix Portland cement/GGBS (30/70), concrete and mortar). All spectra are similar to those of polysulfide complexes contained in the interlayer spacing of a synthetic green-colored hydrated calcium aluminate phase (AFm). This "greening effect" demonstrates a progressive oxidation of sulfide-based compounds initially contained in these materials during curing of GGBS bearing materials.