How sulfates and increased temperature affect delayed ettringite formation (DEF) in white cement mortars

Adamopoulou, Evgenia; Pipilikaki, P.; Katsiotis, Marios S.; Chaniotakis, M.; Katsioti, M.

doi:10.1016/j.conbuildmat.2011.03.051

Cited by 37 publications

(9 citation statements)

References 15 publications

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“…test methods and include them in the standards. Evidence of the relation between C3A and the intensity of formed ettringite can be observed in the studies involving mortars by Katsioti et al (2011). Furthermore, researchers like Asamoto et al (2017) had determined at the laboratory that DEF will occur just in the presence of contents of SO3 above 3%.…”

Section: Introductionmentioning

confidence: 93%

Behavior of mortars with different types of cement when induced to Delayed Ettringite Formation (DEF)

Bonsembiante

Langoski

Hasparyk

2021

Revista de la Asociación Latinoamericana de Control de Calidad,

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The purpose of this paper is to present an evaluation of different types of cement and the incidence of Delayed Ettringite Formation (DEF) through mortar composites cast in the laboratory and exposed to a high curing temperature over a 12-month study period. DEF represents one of the types of Internal Sulfate Attacks (ISA) related to an expansive chemical reaction that occurs inside of concrete involving the sulfates from cement. Experiments involved the assessment of expansions, compressive and tensile strengths as well as microstructural characteristics over time. It was observed that tests performed on mortars and with a specific mix required an extended evaluation period to distinguish the behaviors. Furthermore, high early-strength cement featured the worst binder when faced with DEF.

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Section: Introductionmentioning

confidence: 93%

Behavior of mortars with different types of cement when induced to Delayed Ettringite Formation (DEF)

Bonsembiante

Langoski

Hasparyk

2021

Revista de la Asociación Latinoamericana de Control de Calidad,

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“…The adsorption behaviour of sulfate on calcium-silicate-hydrate gel may affect the hydration and the release of adsorbed sulfate ions to provide the sulfate sources for the later hydration and even the formation of delayed ettringite (Mehta, 1983;Neville, 2004). Most attention has been given to the delayed ettringite formation, whereas the adsorption behaviour of sulfate on calcium-silicatehydrate gel has received little attention (Adamopoulou et al, 2011;Bouzabata et al, 2012;Pavoine et al, 2012).…”

Section: Introductionmentioning

confidence: 97%

Adsorption behaviour of sulfate in early cement hydration

Qian

Yan

et al. 2015

Advances in Cement Research

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This paper investigates the adsorption behaviour of sulfate on calcium-silicate-hydrate (C-S-H) gel, which is significantly related to cement hydration and delayed ettringite formation. Aqueous sulfate solution from cement paste and prepared calcium-silicate-hydrate samples are used to take other ions and cement hydration into account.The effects of gypsum content, temperature and alkalinity on dissolution and adsorption behaviours of sulfate in cement paste are studied. The results show that higher gypsum content leads to more sulfate ions adsorbed on samples. Sulfate adsorption on calcium-silicate-hydrate samples increases with temperature elevation, which is in agreement with both Divet's and Š kapa's results, which used relatively simple calcium-silicate-hydrate-sulfates systems. Higher alkalinity is unfavourable for sulfate ions adsorbed on calcium-silicate-hydrate samples. An alternative opinion was given by Divet and Randriambololona whose result is complex and not representative owing to the adsorption behaviour of sodium ions being neglected.

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“…The dehydration at 105°C under CO 2 -free conditions is normally used to differentiate between chemical bound and non-evaporable water [3]. Both of gel water and capillary water are dehydrated below 105°C as evaporable water [4].Also there is an access of water contained in cement by immersing the cement blocks in distilled water to simulate water infiltration from the surrounding environment causing the penetration of harmful ions into the cement blocks, and leaching of cement blocks compounds [5][6][7][8][9][10]. So after the cement blocks are irradiated, two reactions occur as a clue to gamma radiation…”

Section: Introductionmentioning

confidence: 99%

Effect of Gamma Radaition on the Morphology of Concrete in Radioactive Waste Disposal Site 2

Zaky¹

2019

Arab Journal of Nuclear Sciences and Applications

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Cement is an important material in radioactive waste management. It is used as a solidifying agent for the concentrated wastes resulting from the treatment process. The solidification process results in immobilized wastes. To protect the human and the environment for long periods of time, the solidified waste forms should withstand the operation and storage conditions. Hence, the cement blocks should have proper mechanical and chemical properties. Moreover, the effect of radiation on the blocks should be studied to assure the retention of radionuclides by the cement matrix under radiation fields. To carry out the study, cement blocks were irradiated by Gamma radiation at doses 40, 120 and 240 KGy. The morphology of the blocks was studied before and after irradiation using X-ray Diffraction Patterns (XRD), and Scanning Electron Microscopy (SEM). The results of morphology studies are presented. The morphology studies indicated an improvement in the fixation of radionuclides on the cement matrix after irradiation.

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How sulfates and increased temperature affect delayed ettringite formation (DEF) in white cement mortars

Cited by 37 publications

References 15 publications

Behavior of mortars with different types of cement when induced to Delayed Ettringite Formation (DEF)

Behavior of mortars with different types of cement when induced to Delayed Ettringite Formation (DEF)

Adsorption behaviour of sulfate in early cement hydration

Effect of Gamma Radaition on the Morphology of Concrete in Radioactive Waste Disposal Site 2

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