Delayed ettringite formation symptoms on mortars induced by high temperature due to cement heat of hydration or late thermal cycle

Barbarulo, Rémi; Peycelon, H.; Prené, Stéphanie; Marchand, J.

doi:10.1016/j.cemconres.2004.05.041

Cited by 38 publications

(19 citation statements)

References 9 publications

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“…Which occurs at the Titanium Ruthenium anode in the reservoir containing de-ionized water + Ca (OH) 2 . The choice of lime as a solute has also been made to provide hydroxide ions OH -to the solution in order to consumed during the reaction.…”

Section: -P4mentioning

confidence: 99%

“…-the CO 3 2-ions migrating under electric field, enter into the concrete and react with the portlandite Ca (OH) 2 to form of calcite. Since the decrease in pH of the concrete influences the formation of ettringite, calcite formation should accelerate the appearance of RSI.…”

Section: Case Of K 2 Co 3 Solutionmentioning

confidence: 99%

“…That phenomenon leads to the development of deleterious expansions [1], which results in the cracking of the material and the decrease of the mechanical properties and durability provided that the temperature within the concrete exceeds a certain limit of about 70 °C [2] [9], allowing the remobilization of sulphates originally present in the cement matrix. The ISA is commonly encountered in the case of precast concrete pieces thermally treated; however, it can also appear in large concrete pieces within which the temperature exceeded 70 °C during their thermal history.…”

Section: Introductionmentioning

confidence: 99%

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Development of an accelerated test for Internal Sulfate Attack study

Khelil

Aubert

Escadeillas

2014

MATEC Web of Conferences

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Abstract. Internal Sulfate Attack (ISA) is a pathology that occurs under certain conditions in concrete having undergone heating above 70 °C at early age (through heating in pre-casting industry or due to hydration in large concrete parts). This reaction deemed very slow, numerous methods to speed up reactions leading to delayed ettringite formation have been developed. These methods are all based on the material damage. Another type of test is currently under development. It is based on rehabilitation techniques such as electrochemical chloride extraction (ECE) in order to accelerate the leaching of alkalis that could be one of the triggers of the pathology. The study presented in this paper focused on concrete specimens prepared from cement (CEM I 52.5 N) enriched with Na2SO4. These concretes have undergone a heat treatment typical of those used in precast plants (up to 24 hours with a maximum temperature of 80 °C). Various paths were explored for the development of the accelerated test. The first results showed that it was necessary to use a removable titanium anode ruthenium anode instead of stainless steel embedded in the concrete. Then tests with de-ionized water as the solute to the cathode did not accelerate the onset of expansions. The experiment has been modified and potassium carbonate was added to the solution. This modification didn't show any significant improvement, and other experiments are being carried out to explain this result.

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Section: -P4mentioning

confidence: 99%

Section: Case Of K 2 Co 3 Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of an accelerated test for Internal Sulfate Attack study

Khelil

Aubert

Escadeillas

2014

MATEC Web of Conferences

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“…The internal expansion forces are produced under the action of delayed ettringite, and the expansion in concrete occurs due to the internal expansion forces. Barbarulo et al [11] studied the expansion of concrete during DEF under high temperature and thermal cycle, and found that the expansion strain reaches 3%. Pavoine et al [12] further considered the effect of wetting and drying on the expansion of concrete due to DEF, and indicated that the expansion occurs earlier than that in the concrete without wetting and drying condition.…”

Section: Introductionmentioning

confidence: 99%

A new chemo-mechanical model of damage in concrete under sulfate attack

Chen

Song

2016

Construction and Building Materials

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“…The crystalline phase representative of first hydration product is eUringite, 3CaO.Ah03.CaS04.32H20, containing a large volume of water, and it is formed by mixing five starting materials, Portland cement, anhydrous hauyne (3CaO.3AhO,.CaSO,J, gypsum (CaSO,), quick lime (CaO), and water [10]. However, ettringite displays two major drawbacks in a high temperature environment: One is a delay in its formation at a heating temperature> 70°C [11][12][13][14]; the other is its hydrothermal decomposition at temperature> 170°C [15]. Thus, this volume expansion technology was inapplicable for our sealer.…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO Additive on Volumetric Expansion of Self-Degradable Cements

Sugama¹,

Warren²,

Butcher³

2011

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We identified hard-hurned magnesium oxide (MgO) as a suitable expansive additive for improving the plugging performance of self-degradable, temporary sodium silicateactivated slag/Class C fly ash (SSASC) blend cement sealers into rock fractures in Enhanced Geothermal Systems (EGSs). MgO extended the volumetric expansion of sealers during their exposure to a hydrothermal environment at 200°C under pressures, ranging from 300 to 1500 psi. A great expansion ratc of 19.3 % was observed by adding 3.0 wt% MgO under 300 psi pressure, thus promising to plug thoroughly inner fracture.When the pressure was increa'icd from 300 psi to 1500 psi, the expansion rate of cement markedly reduced, corresponding to the formaLion of crack-free specimens and the improvement of compressive strength. However, with 3.0 wt% MgO, the specimens still engendered the generation of numerous visual cracks, although they were prepared under a high pressure of 1500 psi. The effective content of MgO in minimizing and eliminating the generation of cracks was 2.0 wt%, which provided a moderate expansion of~.5 %_ The compressive strength of 2.0 wt% MgO specimens made under a pressure of 300 psi rose -J.7-fold to 4816 psi with an increasing pressure to 1500 psi. The in-situ growth of brucite crystal formed by the hydrothermal hydration of MgO was responsive for such an expansion of the SSASC cement; meanwhile. two crystalline hydrothermal reaction products, 1.1 om tobermorite and calcium silicate hydrated (I). contributed to the development of the sealer's compressive strength. Thus, the increasing pressure seems to suppress and control a growth rate of brucite crystal in response to a lower extension of expansion. Furthermore. all MgO-conlaining SSASC sealers possessed the watercatal yzed self.-degradable properties.2

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Delayed ettringite formation symptoms on mortars induced by high temperature due to cement heat of hydration or late thermal cycle

Cited by 38 publications

References 9 publications

Development of an accelerated test for Internal Sulfate Attack study

Development of an accelerated test for Internal Sulfate Attack study

A new chemo-mechanical model of damage in concrete under sulfate attack

Effect of MgO Additive on Volumetric Expansion of Self-Degradable Cements

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