The effects of chemical environment on the nucleation, growth, and stability of ettringite [Ca3Al(OH)6]2(SO4)3·26H2O

Cody, Anita M.; Lee, Hyungjun; Cody, Robert D.; Spry, Paul G.

doi:10.1016/j.cemconres.2003.10.023

Cited by 165 publications

(85 citation statements)

References 18 publications

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“…As pointed out by Burstein et al, the processes of damage evolution include the nucleation and growth of microdamage [17]. The evolution of microdamage will affect the strength, the modulus of elasticity, the Poisson's ratio, the toughness of cement mortar [18][19][20][21][22][23], and that implies it is possible to separate damage evolution from the variation of those macro-properties, such as from the variation of the modulus. The modulus of a specimen can be determined by the velocity of stress wave propagated in the material and the density of the specimen [24], hence, the testing technique of ultrasonic sound is employed for measuring the variation of the velocity of the ultrasonic waves at different eroding time.…”

Section: Introductionmentioning

confidence: 99%

Damage evolution in cement mortar due to erosion of sulphate

2008

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a b s t r a c tUltrasonic technique is used to detect the velocity change of stress wave propagated in the cement mortar immersed in the solution of sodium sulfate for 425 days. Also the density change of specimens at different erosion time is measured. By curve fitting, the effect of solutions' concentration and water/cement ratio on the damage evolution is analyzed. The SEM observation on the growth of delayed ettringite is also performed. It shows that the damage evolution of specimens attacked by sulphate solution is dominantly induced by the nucleation and growth of delayed ettringite, and the average size of microvoids in cement mortar affects the damage evolution significantly.

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Section: Introductionmentioning

confidence: 99%

Damage evolution in cement mortar due to erosion of sulphate

2008

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“…2), blending additions of gypsum to the cement would deter further solubilisation of the anhydrite component within the cement when initially wetted. Similarly, the added presence of citrate salts has been suggested to poison the growth of ettringite crystals [38]. Evidence of this can be observed microscopically in Fig.…”

Section: Early Hydration: Dissolution and Precipitationmentioning

confidence: 74%

The impact of intrinsic anhydrite in an experimental calcium sulfoaluminate cement from a novel, carbon-minimized production process

et al. 2017

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Calcium sulfoaluminate clinker produced through a previously described novel production process, generating further economies of carbon emission minimization and sulfur use efficiency, is tested for performance as a cementitious binder. The reactivity levels of major phases, including ye'elimite, two polymorphs of belite and anhydrite are found to produce a viable product characterized by rapid hydration. Through investigation, the reactivity is linked to the unique distribution of crystalline phases present within cement grains. It is inferred that both microstructure and mineralogy are responsible for the undesirable set behaviour encountered. The causality of this problem is further investigated and determined to be a consequence of the intrinsic anhydrite component for which remediation solutions are described. The resultant mortar compression strengths are determined for the subject cement in order to characterize its potential in relation to ordinary Portland cement.

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“…While not actinide systems, other studies of transition species in the Cd-I-Cu system have demonstrated that the impurities in copper compounds promote preferential growth directionality along surface planes, consistent with our results here, while other work has revealed the effect of chemical impurities on nucleation and growth of ettringite in a concrete environment. [26,27]. Alternatively, materials L1 and L2 had already begun oxidation and hydration before they were removed from storage, which may have induced a more rapid change over this 2 year time period under high relative humidity.…”

Section: Legacy Samplesmentioning

confidence: 95%

Morphology of U3O8 materials following storage under controlled conditions of temperature and relative humidity

Tamasi

Cash

Mullen

et al. 2016

J Radioanal Nucl Chem

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Changes in the visual characteristics of uranium oxide surfaces and morphology following storage under different conditions of temperature and relative humidity may provide insight into the history of an unknown sample. Sub-samples of three a-U 3 O 8 materials-one that was phase-pure and two that were phase-impure-were stored under controlled conditions for two years. Scanning electron microscopy was used to image the oxides before and after storage, and a morphology lexicon was used to characterize the images. Temporal changes in morphology were observed in some sub-samples, and changes were greatest following exposure to high relative humidity.

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The effects of chemical environment on the nucleation, growth, and stability of ettringite [Ca3Al(OH)6]2(SO4)3·26H2O

Cited by 165 publications

References 18 publications

Damage evolution in cement mortar due to erosion of sulphate

Damage evolution in cement mortar due to erosion of sulphate

The impact of intrinsic anhydrite in an experimental calcium sulfoaluminate cement from a novel, carbon-minimized production process

Morphology of U3O8 materials following storage under controlled conditions of temperature and relative humidity

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