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, starting materials and prepared cement were characterized through different techniques including; Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM).
60 citations
TL;DR: In this paper, it was shown that from the trigonal prisms (n = 30−18) the structure of the ettringite crystals is maintained; from the main apices (n=18−6) - crystals become roentgenoamorphous, but their sign of elongation alters and ends are destructed; from 6−0 - longitudinal and transverse ruptures appear and the crystals disintegrate.
60 citations
TL;DR: In this paper, the effect of different factors on sulfate requirement in C3S/C3A systems was explored, and it was observed that reaction rates of both C 3S and C 3A have an influence on the overall sulfate balance, as they affect the amount of sulfate adsorbed on C-S-H and the amount ettringite formed, respectively.
60 citations
TL;DR: In this paper, the concrete lining of a vertical ventilation shaft exposed to sulfate-bearing groundwater for 45 years was investigated, and optical and electron microscopy were used to assess the degree of damage and alteration of the concrete.
Abstract: The concrete lining of a vertical ventilation shaft exposed to sulfate-bearing groundwater for 45 years was investigated. The concrete was characterized at several sites with different degrees of damage. Apart from strength measurements, optical and electron microscopy were the main tools used to assess the degree of damage and alteration of the concrete. The occurrence of damage appears to be related to the availability of sulfate-bearing groundwater on one side and the presence of poor-quality concrete on the other side. Most of the damage in the form of severe spalling is caused by ettringite formation. The impact of thaumasite formation with disintegration of the cement paste seems to be minor as it occurs after the concrete is already severely damaged. The mineral assemblages and the sequence of mineral formation caused by sulfate attack agree with the findings of laboratory studies and thermodynamic modeling.
60 citations
TL;DR: In this paper, the effect of accelerated carbonation and ageing on the mineralogical composition and microstructure of fiber-cement composites reinforced with both cellulose pulp and synthetic fibers was investigated.
59 citations