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, the effects of hydrating a white Portland cement (wPc) in 030 and 050 M solutions of sodium aluminate (NaAlO2) at 5 and 20 °C were investigated by 27Al and 29Si magic-angle spinning (MAS) NMR spectroscopy.
298 citations
TL;DR: In this article, the authors developed a mechanistic model for the mechanism of attack resulting from sodium and magnesium sulfate solutions, and the potential of these mechanistic models for use in service life prediction models has also been identified.
284 citations
TL;DR: The addition of CaCO 3 and CaSO 4 to Portland cement clinker influences the hydration and the strength development as mentioned in this paper, leading to a higher early compressive strength and a lower late compressive power.
Abstract: The addition of CaCO 3 and CaSO 4 to Portland cement clinker influences the hydration and the strength development An increase of the CaSO 4 content accelerates alite reaction during the first days and results in the formation of more ettringite, thus in a higher early compressive strength The late compressive strength is decreased in Portland cements containing higher quantities of CaSO 4 The reduced late compressive strength seems to be related to an increase of the S/Si and Ca/Si content in the C–S–H The presence of calcite leads to the formation of hemicarbonate and monocarbonate thus indirectly to more ettringite Only a relatively small quantity of calcite reacts to form monocarbonate or hemicarbonate in Portland cement Although hemicarbonate is thermodynamically less stable than monocarbonate, hemicarbonate formation is kinetically favored Monocarbonate is present only after 1 week and longer independent of the quantity of calcite available and the content of sulphate in the cement
278 citations
TL;DR: In this paper, a study of the hydration of tricalcium aluminate in the presence of gypsum at an early age was carried out with various quantities of different types of C3A and its fineness.
273 citations
TL;DR: In this paper, it was shown that the heat released during the hydration of a commercial Ordinary Portland Cement can be assigned mainly to three mechanisms, the silicate reaction (sum of dissolution of alite and precipitation of C-S-H-phase and portlandite), the dissolution of C3A, and the precipitation of ettringite.
265 citations