Delayed ettringite formation

Taylor, H. F. W.; Famy, C; Scrivener, Karen

doi:10.1016/s0008-8846(01)00466-5

Cited by 634 publications

(266 citation statements)

References 30 publications

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“…[114]), is a similar process. Examples of mineral reactions that have been shown or are believed to produce a FoC include (a) uptake of crystallisation water by thenardite to produce mirabilite [35,118], (b) delayed ettringite formation in concrete [37,54,116], (c) serpentinisation and possibly carbonation of peridotite [60,67,68,97,104], (d) replacement of leucite by analcime in low-silica rocks [61], (e) conversion of anhydrite into gypsum [70] and (f) the hydration of metal oxides such as quicklime (CaO) and periclase (MgO) [43,94]. In a geological context, development of a force of crystallisation is widely considered to play an important role in pseudomorphic replacement [40,89], as well as vein formation [40,47,87,114] and reaction-driven fracturing [61,97,100,104].…”

Section: Force Of Crystallisation: Examples and Previous Measurementsmentioning

confidence: 99%

Reaction-driven casing expansion: potential for wellbore leakage mitigation

2017

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It is generally challenging to predict the postabandonment behaviour and integrity of wellbores. Leakage is, moreover, difficult to mitigate, particularly between the steel casing and outer cement sheath. Radially expanding the casing with some form of internal plug, thereby closing annular voids and fractures around it, offers a possible solution to both issues. However, such expansion requires development of substantial internal stresses. Chemical reactions that involve a solid volume increase and produce a force of crystallisation (FoC), such as CaO hydration, offer obvious potential. However, while thermodynamically capable of producing stresses in the GPa range, the maximum stress obtainable by CaO hydration has not been validated or determined experimentally. Here, we report uniaxial compaction/expansion experiments performed in an oedometer-type apparatus on precompacted CaO powder, at 65°C and at atmospheric pore fluid pressure. Using this set-up, the FoC generated during CaO hydration could be measured directly. Our results show FoC-induced stresses reaching up to 153 MPa, with reaction stopping or slowing down before completion. Failure to achieve the GPa stresses predicted by theory is attributed to competition between FoC development and its inhibiting effect on reaction progress. Microstructural observations indicate that reaction-induced stresses shut down pathways for water into the sample, hampering ongoing reaction and limiting the magnitude of stress build-up to the values observed. The results nonetheless point the way to understanding the behaviour of such systems and to finding engineering solutions that may allow large controlled stresses and strains to be achieved in wellbore sealing operations in future.

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Section: Force Of Crystallisation: Examples and Previous Measurementsmentioning

confidence: 99%

Reaction-driven casing expansion: potential for wellbore leakage mitigation

2017

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“…The mechanisms of expansion due to reactions with specific ions, e.g. sulfate and chloride, have been extensively discussed in the literature [3][4][5][6][7]. Degradation theories have generally focused on mechanisms occurring at the micrometer scale.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the volume stability of C–S–H (I) and Portland cement paste in aqueous salt solutions

2007

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1007/s10853-006-1328-5 Science, 42, 16, pp. 6837-6846, 2007-08-01 A Comparative study of the volume stability of C-S-H (I) and Portland cement paste in aqueous salt solutions Dramé, H.; Beaudoin, J. J.; Raki, L. Journal of Materialshttp://irc.nrc-cnrc.gc.ca A Comparative study of the volume stability of C-S-H(I) and Portland cement paste in aqueous salt solutions NRCC-45612Dramé, H.; Beaudoin, J.J.; Raki, L.A version of this document is published in / Une version de ce document se trouve dans: Journal of Materials Science, v. 42, no. 16, August 2007, pp. 6837-6846 Doi: 10.1007/s10853-006-1328 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. Similarities were observed between the length change behavior of compacted C-S-H (I) and the swelling of smectite clays in contact with these osmotic media. The similarities are compatible with explanations of expansion provided by both the osmotic and the electrical double layer (EDL) theories. The relationship between the expansive behavior of C-S-H and both Na and Ca Montmorillonite in contact with aqueous salt solutions is discussed extensively in the context of its significance in cement science.

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“…A peak temperature of 70 0 C has been stipulated for concrete sections to prevent delayed ettringite formation [Taylor 2001]. As an important conclusion of this case study, it can be noted that when the thickness exceeds 1.6 m, the OPC concrete (M1 mix) exceeds this particular threshold temperature.…”

Section: Figure 4 -Temperature Vs Concrete Thickness Behaviourmentioning

confidence: 82%

Prediction of Temperature Development in Concrete using Semi-adiabatic Temperature Measurements

Wasala¹,

Yapa

2017

Engineer

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Abstract:Temperature development in concrete is caused by the heat of hydration which can be measured using calorimetric methods. In this study, a semi adiabatic calorimeter test was used first to measure the temperature development in six distinct C35A concrete mixes, and then using a heat loss compensation method, adiabatic temperature rise profiles were predicted. Cement and fly ash quantities in the mixes were varied to study the variations of the temperature development. The study then developed a two dimensional temperature prediction model applicable to rectangular concrete elements, based on heat transfer equations associated with the Fourier equation. A Finite-difference discretization was used in the modelling. The model took into account the heat generation due to cement hydration, heat transfer within the concrete element, and heat interactions between the concrete element and its environment under various boundary conditions. The prediction model has the potential for making two-dimensional temperature predictions in mass concrete at varying times and locations. Finally, the temperature prediction model was used as a case study to study the temperature development in a concrete wall. The results highlight the possible influences of concrete thickness on the internal temperature development of concrete and how the temperature could be controlled by using appropriate concrete mixes.

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Delayed ettringite formation

Cited by 634 publications

References 30 publications

Reaction-driven casing expansion: potential for wellbore leakage mitigation

Reaction-driven casing expansion: potential for wellbore leakage mitigation

A comparative study of the volume stability of C–S–H (I) and Portland cement paste in aqueous salt solutions

Prediction of Temperature Development in Concrete using Semi-adiabatic Temperature Measurements

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