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 use of Al(OH)3 and high concentrations of NaOH to control ettringite formation in the FBC fly ash geopolymer was studied.
Abstract: Fluidized bed coal combstion (FBC) is extensively used in small self-generation power plants. The fly ash obtained from this FBC process contains high quantity of calcium and sulfate compounds which hinders its use in the construction industry. In addition, its reactivity is low and additional source material or additive is, therefore, needed to increase the reaction. This research studied the use of Al(OH)3 and high concentrations of NaOH to control ettringite formation in the FBC fly ash geopolymer. Two replacement levels of 2.5 wt.% and 5.0 wt.% of Al(OH)3 and three NaOH concentrations of 10, 12 and 15 M were used in the study. Results indicated that the NaOH concentration affected the ettringite formation and strength of the FBC geopolymer. No ettringite was formed at high NaOH concentration of 15 M which helped the dissolution of calcium sulfate and formed the additional calcium hydroxide. The subsequent pozzolanic reaction led to strength gain of the geopolymer. For 15 M NaOH, the addition of 2.5 wt.% Al(OH)3 promoted the reaction and formed a dense matrix of alumino silicate compound. Relatively high 7-day compressive strength of 30 MPa was obtained.
71 citations
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TL;DR: In this paper, the behaviour of laboratory-synthesised calcium sulphoaluminate (C4A3S) in alkaline media was explored via isothermal conduction calorimetry and 2-and 28-day mechanical strength values were found.
71 citations
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TL;DR: In this article, the crystalline structure of ettringite, Ca, Al, and S atoms, was investigated using high-resolution time-of-flight neutron powder diffraction techniques.
71 citations
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TL;DR: In this paper, the influence of various parameters on delayed ettringite formation (DEF) was discussed with reference to the investigated concrete, such as concrete composition, cement composition (alkalis, C3S, c3A, SO3, and MgO), fineness, etc.
71 citations
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70 citations