Effect of ettringite on thaumasite formation

Köhler, Stephan Jürgen; Heinz, D.; Urbonas, L.

doi:10.1016/j.cemconres.2005.11.006

Cited by 102 publications

(43 citation statements)

References 18 publications

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“…Thaumasite, however, is more easily stabilised at higher sulfur trioxide/aluminium oxide ratios, greater than that required for ettringite (sulfur trioxide/aluminium oxide ¼ 3) Schmidt et al, 2009); and a solid solution, woodfordite, exists between the two phases (Barnett et al, 2003;Damidot et al, 2004;Macphee and Barnett, 2004). A study by Kohler et al (2006) found a link between ettringite and thaumasite such that ettringite controls the rate of thaumasite formation.…”

Section: Crystallisation Pressurementioning

confidence: 99%

Current knowledge of external sulfate attack

Whittaker

Black

2015

Advances in Cement Research

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This paper offers an update of the current understanding of sulfate attack, with emphasis on the sulfates present in an external water source percolating through, and potentially reacting with, the cement matrix. The paper considers the explanations put forward to explain sulfate attack, both from a chemical and microstructural perspective.Similarly, this paper reviews work on the physical damage caused by the precipitation of sulfate salts in porous materials. With the increased use of binary and ternary blends, this paper also considers the impact of binder composition on sulfate resistance, and similarly reviews how the nature of the sulfate species can affect the nature and extent of any deterioration. This then leads on to the important consideration of differences between field-and lab-based studies, reviewing the effect of various experimental parameters on sulfate resistance. This latter topic is of great importance to anyone who wishes to carry out such experiments.

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Section: Crystallisation Pressurementioning

confidence: 99%

Current knowledge of external sulfate attack

Whittaker

Black

2015

Advances in Cement Research

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“…On the other hand, thaumasite is mostly observed at low temperatures (usually lower than 15 °C). Hence, the effect of ettringite on thaumasite formation was studied in synthetic OPC materials using this methodology (Kholer et al 2006). It must be highlighted that ettringite and thaumasite form a solid solution that has been extensively studied (Barnett et al 2002;Torres et al 2004).…”

Section: Durability Studiesmentioning

confidence: 99%

Rietveld Quantitative Phase Analysis of OPC Clinkers, Cements and Hydration Products

Aranda

Torre

León‐Reina

2012

Reviews in Mineralogy and Geochemistry

136

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“…Although it is undoubtedly true that the rate of thaumasite formation is favoured by these conditions, it has been shown in several recent studies that neither factor is an absolute requirement. 38,39 Indeed, Kohler et al 39 have established that thaumasite forms via heterogeneous nucleation on the surface of ettringite, followed by further epitaxial growth of thaumasite from its components present in solution. The formation of thaumasite in the absence of ettringite was reported to be extremely slow, and more thaumasite was formed when more ettringite was available.…”

Section: Advances In Applied Ceramicsmentioning

confidence: 99%

Surely we know all about cement – don't we?

Sharp

2006

Advances in Applied Ceramics

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Plaster, cement and concrete have been used since antiquity, notably by the Romans. Portland cement was patented by Joseph Aspdin of Leeds in 1824. Since then it has been gradually refined to become the fundamental constituent of modern concrete, familiar to all of us as the major construction material of the past century. Contemporary constructions such as skyscrapers, concert halls, suspension bridges and huge dams testify to the successful use of Portland cement concrete. For routine constructions its compressive strength development and durability are sufficiently well understood for it to be used with confidence in many diverse situations and in locations with widely different climate conditions. Even in the last 30 years, however, unexpected durability problems, such as the alkali silica reaction (ASR), delayed ettringite formation (DEF) and the thaumasite form of sulphate attack (TSA), have emerged. To ensure that the civil engineer can take the necessary steps to avoid their occurrence has required the methods of materials science to be applied to understand the mechanism of these processes. Recent ideas pertaining to the reaction mechanisms underlying DEF and TSA are critically reviewed.

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Effect of ettringite on thaumasite formation

Cited by 102 publications

References 18 publications

Current knowledge of external sulfate attack

Current knowledge of external sulfate attack

Rietveld Quantitative Phase Analysis of OPC Clinkers, Cements and Hydration Products

Surely we know all about cement – don't we?

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