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 article, the authors investigated the mechanical and mineralogical properties of concrete mortars with different pozzolanic compositions and subjected to a sulfated medium and found that the compact structure has more effective properties against sulfate effects for cement mortars.
32 citations
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TL;DR: In this article, a chemical model is specified to simulate the effects of the heating of concrete in terms of reactions involving sulfates, aluminates and alkalis, and the main result of this model is the amount of delayed ettringite.
32 citations
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TL;DR: In this paper, a study of setting and hardening of fresh blends of gypsum binder, Portland cement, and silica fume is described, and the influence of superplasticizer on the setting and hardness of these blends is analyzed.
32 citations
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TL;DR: In this article, the effect of drinking water sludge ash (DWSA) on the properties of DWSA-cement pastes is investigated using x-ray diffraction, scanning electron microscopy coupled with energy-dispersive spectrometry, and thermogravimetry techniques.
Abstract: The effect of drinking water sludge ash (DWSA) on the properties of DWSA-cement pastes is investigated in this study using x-ray diffraction, scanning electron microscopy coupled with energy-dispersive spectrometry, and thermogravimetry techniques. The pozzolanic reactivity of DWSA is confirmed; the filler effect of DWSA can significantly and rapidly accelerate the hydration reaction at an early curing age. The presence of DWSA in blended pastes promotes the incorporation of aluminum into the C-(A)-S-H gel; the original ‘Al-minor’ C-(A)-S-H gel in pure cement paste is converted to ‘Al-rich’ C-(A)-S-H gel. The added DWSA leads to the formation of aluminum-bearing hydrates, such as ettringite and calcium aluminate hydrates (C-A-H). The compressive strength of sludge-derived concrete blocks is studied; blocks containing 10% DWSA exhibited higher compressive strength at a curing age of 90 d than the reference samples. Such benefits are not observed in block samples with 20 and 30% DWSA, which is attributed mainly to the physical effect of unreacted DWSA particles.
32 citations
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TL;DR: In this article, the shrinkage behavior of sodium silicate activated slag (SSAS) incorporated with gypsum and Portland cement (PC) was investigated, and the hardened properties, namely flexural and compressive strength, were investigated as well.
31 citations