Some factors affecting delayed ettringite formation in heat-cured mortars

Escadeillas, Gilles; Aubert, Jean‐Emmanuel; Segerer, Maximiliano; Prince, William

doi:10.1016/j.cemconres.2007.07.004

Cited by 78 publications

(46 citation statements)

References 20 publications

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“…As for the alkali-aggregate reaction, the appearance of the disorder usually occurs after several decades, which further complicates its study. Numerous factors are important or even indispensable, such as a preliminary microcracking (Collepardi, 2003;Fu & Beaudoin, 1996), wetting-drying (W-D) cycles (Fu & Beaudoin, 1996;Grabowski, Czarnecki, Gillott, Duggan, & Scott, 1992;Pavoine, Divet, & Fenouillet, 2006) and the alkali content of the cement Damidot & Glasser, 1993;Divet & Randriambololona, 1998;Escadeillas, Aubert, Segerer, & Prince, 2007;Glasser, 1996). Many years of research on the subject has helped to increase awareness of the pathology and, in particular, the influence of the different parameters.…”

Section: Introductionmentioning

confidence: 97%

Effect of wetting-drying cycles on mortar samples affected by DEF

Leklou¹,

Aubert²,

Escadeillas³

2012

European Journal of Environmental and Civil Engineering

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International audienceThis article, which deals with the effect of wetting-drying (W-D) cycles on materials affected by delayed ettringite formation (DEF), has two main objectives. The first is to observe whether W-D cycles pre-damage samples, by using the replica technique. Scanning electron microscopy (SEM) observations of replicas show that W-D cycles lead to microcracks in the samples. The second objective of the study is to observe whether the cycles are necessary for development of DEF or if they only accelerate DEF. A study of the expansion of the samples shows that cycles accelerate the appearance of expansion but they are not a prerequisite for triggering DEF

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Section: Introductionmentioning

confidence: 97%

Effect of wetting-drying cycles on mortar samples affected by DEF

Leklou¹,

Aubert²,

Escadeillas³

2012

European Journal of Environmental and Civil Engineering

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“…More recently, Zhang and colleagues have proposed a DEF index calculated using SO 3 , C 3 A and alkalis expressed in Na 2 O eq contents. The significant role of alkalis in DEF is being highlighted more and more in numerous studies and, in particular, in a previous work by Escadeillas et al (2007). Diamond, drawing his inferences from the works of Famy (1999) and Zhang (1999), has discussed the relevance of laboratory studies on DEF to DEF in field concretes (Diamond, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…More recently, researchers have tried to identify factors that could accelerate the appearance of this pathology, such as preliminary microcracking of the specimens (with mechanical or thermal origins) (Escadeillas et al, 2007;Pavoine et al, 2006aPavoine et al, , 2006bPetrov and Tagnit-hamou, 2004). For other researchers, these factors are necessary to the appearance of the phenomenon (Collepardi, 1997;Fu et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Five year monitoring of curing solutions of heat-cured mortars affected by delayed ettringite formation

Aubert

Escadeillas

Leklou

2013

Advances in Cement Research

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The work presented in this paper studies the leaching of heat-cured mortars affected by delayed ettringite formation (DEF). For this, the expansion and the leaching of various elements (OH 2 , Ca 2 , Na and K ) were monitored for more than 5 years in three mortars: a reference mortar and two compositions in which 3 . 11% of Na 2 SO 4 (sodium sulfate) and 1 . 75% of NaOH (sodium hydroxide) were added to the mixture. The four mortars expanded but with different kinetics. pH, conductivity and leaching of calcium had the same global variation: a fast decrease during the first few days of curing, a strong increase after the beginning of the expansions and, lastly, a plateau of several months followed, or not (depending on the mixtures and the progress of the reaction), by a strong decrease in leaching. Finally, the results suggest that the reasons for DEF are not only related to the leaching of alkalis.

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“…(Collepardi 2003, Pavoine 2006, Brunetaud et al 2007, Escadeillas et al 2007, Flatt and Scherer 2008, Martin 2010, to initiate the DEF reaction and support the further expansion and damage of concrete, a combination of the following parameters is needed, -presence of sufficient amount of moisture -all the DEF related problems have arisen in areas exposed to water (bridges, dams, rail ties, etc. ); -internal temperature of element exceeding ca.…”

Section: Introductionmentioning

confidence: 99%

Modeling Strains of Concrete Induced by Delayed Ettringite Formation in Variable Hygro-Thermal Conditions

Januszkiewicz¹,

Pesavento²,

Grymin³

et al. 2015

Concreep 10

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Delayed Ettringite Formation is a type of chemical degradation of moist concrete exposed at early ages to heating up to temperature of about 70-80°C. The material deterioration is caused by expanding phases produced by the ettringite reaction. A phenomenological, rate-type model of the DEF strains, considering effect of the temperature and duration of heat-treatment of concrete at early ages, and the evolution of ambient temperature and relative humidity, on the development of strains is introduced into the mathematical model of heat and moisture transport in deformable porous media. The model equations are solved numerically by means of finite element, finite difference and Newton-Raphson methods. The computer code was developed and used for the model validation by comparing its' results with the published experimental data

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Some factors affecting delayed ettringite formation in heat-cured mortars

Cited by 78 publications

References 20 publications

Effect of wetting-drying cycles on mortar samples affected by DEF

Effect of wetting-drying cycles on mortar samples affected by DEF

Five year monitoring of curing solutions of heat-cured mortars affected by delayed ettringite formation

Modeling Strains of Concrete Induced by Delayed Ettringite Formation in Variable Hygro-Thermal Conditions

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