Topic
Ettringite
About: Ettringite is a research topic. Over the lifetime, 2702 publications have been published within this topic receiving 67056 citations. The topic is also known as: woodfordite.
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TL;DR: In this paper, a field investigation was conducted to analyze the concrete damage mechanism by means of XRD, IC, AAS and EPMA, and the results showed that large amounts of Na2SO4 were generated on the surface layer of the concrete lining, causing concrete detachment layer by layer.
39 citations
01 Feb 2003
TL;DR: In this paper, a Raman scattering and X-ray diffraction study of the thermal decomposition of a naturally occurring, ettringite-group crystal is presented, and the results are supported by X-Ray diffraction results obtained at increasing temperatures.
Abstract: A Raman scattering and X-ray diffraction study of the thermal decomposition of a naturally occurring, ettringite-group crystal is presented. Raman spectra, recorded with increasing temperature, indicate that the thermal decomposition begins at ≈55 °C, accompanied by dehydration of water molecules from the mineral. This is in contrast to previous studies that reported higher temperature breakdown of ettringite. The dehydration is completed by 175 °C and this results in total collapse of the crystalline structure and the material becomes amorphous. The Raman scattering results are supported by X-ray diffraction results obtained at increasing temperatures.
39 citations
TL;DR: In this paper, the characterization and leaching behaviors of three fly ashes taken from different low grade lignite-fired stations were characterized in terms of their physical, chemical, mineralogical and morphological properties.
39 citations
TL;DR: In this paper, the influence of bleeding on slump flow and solid phase distribution of fresh Portland cement paste, as well as the hydration product distribution, splitting behavior, and porosity of the hydrated cement paste were investigated.
39 citations
TL;DR: Early evidence of thaumasite formation in mortar with limestone filler exposed to sulfate containing tunnel water in Norway is reviewed in this paper, where mortars with 20% limestone or quartz filler, respectively, are stored in 5% sodium sulfate solution saturated with gypsum at 5 °C.
Abstract: Early evidence of thaumasite formation in mortar with limestone filler exposed to sulfate containing tunnel water in Norway is reviewed. The problem is discussed in light of the new European cement standard allowing cements containing up to 35% limestone (e.g. CEM II/B-L) rendering them prone to detrimental sulfate attack. Experiments are performed where mortars with 20% limestone or quartz filler, respectively, are stored in 5% sodium sulfate solution saturated with gypsum at 5 °C. Length change, flexural strength and compressive strength are measured periodically for a year. The microstructure of the mortars is inspected by scanning electron microscopy and energy dispersive analyser of X-rays documenting the formation of sulfate containing species including ettringite and thaumasite.
38 citations