Durability of mortars modified with metakaolin

Courard, Luc; Darimont, Anne; Schouterden, Marleen; Ferauche, Fabrice; Willem, Xavier; Degeimbre, Robert

doi:10.1016/s0008-8846(03)00090-5

Cited by 187 publications

(71 citation statements)

References 3 publications

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“…Adding approximately 10-15% MK raises reinforcing steel corrosion resistance (91,92). The presence of MK reduces chloride ion diffusion substantially in blended cement concretes (88,90,(93)(94)(95), while contradictory results have been reported for its performance in environments containing CO 2 (96,97). Mejía et al (98) observed that the carbonation depth was slightly shallower in 28-day MK-containing specimens than in concretes with no additions, and claimed that at longer curing times the carbonation rate declined; Vejmelková et al (99) likewise found that MK-blended materials exhibited higher carbonation resistance.…”

Section: Adición De Materiales Mineralesmentioning

confidence: 99%

“…La resistencia a la corrosión del acero de refuerzo aumenta con adiciones de MK del 10-15% aproximadamente (91,92). La presencia de MK reduce ampliamente la difusión de iones cloruro en hormigones adicionados (88,90,(93)(94)(95); por el contrario se reportan resultados controvertidos para el desempeño en presencia de CO 2 (96,97). Mejía et al (98) presentan en su estudio que la profundidad de carbonatación para especímenes adicionados con MK a 28 días de curado son levemente superadas por los hormigones sin adición, y afirman que al incrementar las edades de curado la velocidad de carbonatación se reduce; Vejmelková et al (99) igualmente comprobaron que los materiales adicionados con MK presentan mejor desempeño a carbonatación.…”

Section: Adición De Materiales Mineralesunclassified

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Durabilidad del hormigón armado expuesto a condiciones agresivas

Aguirre¹,

Gutiérrez²

2013

Mater. construcc.

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Reinforced concrete is the most widely used construction material in the world. The combination of high compressive strength, afforded by concrete and, and the excellent mechanical properties that characterise steel make it an ideal composite for all manner of structures. One of the main weaknesses of this material, however, is that when the concrete is exposed to aggressive environments, in particular high concentrations of chloride ions or carbon dioxide, reinforcing steel corrodes, shortening service life. This article reviews the state of the art on concrete durability, along with the conditions that affect its useful life by inducing reinforcing steel corrosion. It also discusses the prevention and control methods, in particular electrochemical prevention and rehabilitation techniques, that have been developed to mitigate the problem.Keywords: reinforced concrete; steel corrosion; mineral additions; electrochemical rehabilitation. RESUMENEl hormigón armado se ha convertido en el material más utilizado a nivel mundial en el sector de la construcción. La combinación de las altas prestaciones a resistencia a la compresión que ofrece el hormigón y las excelentes propiedades mecánicas del acero lo hacen el material compuesto ideal para aplicaciones estructurales. Sin embargo, uno de los mayores problemas que afecta la vida útil del hormigón es la corrosión del acero de refuerzo, la cual se presenta cuando el hormigón se encuentra expuesto a ambientes agresivos, en especial frente a la exposición a iones cloruros y/o dióxido de carbono. Este trabajo revisa el estado del conocimiento con respecto a la durabilidad del hormigón enfatizando en los fenóme-nos que afectan su durabilidad y generan la corrosión del acero de refuerzo, adicionalmente se incluyen los métodos de prevención y control que se han desarrollado para mitigar el problema, en particular los relacionados con las técnicas electroquímicas de prevención y rehabilitación. INTRODUCTIONVersatility and low cost have made concrete one of the world's most popular construction materials (1, 2). This ceramic material is characterised by high compressive strength, although it is prone to cracking under other types of mechanical stress such as bending and tensile forces, torque and shear. That weakness led to the advent of reinforced concrete, a combination of concrete and structural steel widely used to build bridges, buildings in general and skyscrapers in particular, tunnels and a host of other structures. One of the most important features of concrete, in addition to its mechanical properties, is its durability, which is associated with the inservice life of structures exposed to certain conditions or environments (3, 4). More specifically, reinforcing steel corrosion has been identified as the main weakness of reinforced concrete (5). This paper discusses the main types of concrete deterioration, including the processes that contribute to steel corrosion, and the respective prevention and control methods, such as the use of inhibitors and coatings, ...

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Section: Adición De Materiales Mineralesmentioning

confidence: 99%

Section: Adición De Materiales Mineralesunclassified

Durabilidad del hormigón armado expuesto a condiciones agresivas

Aguirre¹,

Gutiérrez²

2013

Mater. construcc.

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“…Courard et al [34] who observed constant values around 0.30 g/cm 2 for 0%, 5%, 10%, 15% and 20% MK, with a slight decrease of WCA for 20% MK. In their studies, Shekarchi et al [35] have noted an improvement of 28% in water absorption at 15% MK after 28 days of curing was recorded.…”

Section: Capillarity Water Absorptionmentioning

confidence: 93%

The Influence of Metakaolin from Saaba (Burkina Faso) over Physico-Mechanical and Durability Properties of Mortars

Ntimugura¹,

Sore²,

Bello³

et al. 2017

OJCE

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The paper evaluates the feasibility of reducing clinker in the Portland Cement production using local metakaolin in Burkina Faso. Standardized testing methods have been used for this purpose, and experiments were performed on mortar prisms containing different amounts of metakaolin. Important results about the physical, mechanical and durability characterization of blended mortars were carried out in this study. The obtained results are discussed based on available literature data. These results have shown increased physical and durability properties for blended mortars. Although the mechanical strengths remained relatively low for higher MK incorporations, the latter grow to surpass these of PC mortars (the reference) at 28, 56 and 90 days of curing. The results in the paper, have confirmed the possibility of using metakaolin to partially substitute cement, a possibility to reduce the CO2 production by the cement industry in Burkina Faso.

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“…Ο μετακαολίνης βρέθηκε να είναι αποτελεσματικός στη μείωση της προσβολής υπό τη μορφή του ταουμασίτη από τα θειικά ιόντα σε σκυρόδεμα, που περιείχε ασβεστολιθικό φίλερ. Πρόσφατες εργασίες έχουν δείξει ότι ο μετακαολίνης είναι αποτελεσματικός, ως συμπληρωματικό τσιμεντοειδές υλικό, στη βελτίωση της ανθεκτικότητας του σκυροδέματος, για παράδειγμα έναντι της αντίδρασης αλκαλίου-πυριτίου και της αντοχής έναντι της διάχυσης των χλωριόντων [2,[18][19][20][21][22][23][24][25].…”

Section: έρευνεςunclassified

“…Εξαιτίας της ποζολανικής αντίδρασης του μετακαολίνη, μειώνεται το υδροξίδιο του ασβεστίου και αυξάνεται το δευτερογενές C-S-H στη μήτρα του τσιμέντου. Το γεγονός αυτό παρέχει την ευκαιρία να μετατραπεί το πρωτογενές και το δευτερογενές C-S-H σε M-S-H (ή M-C-S-H) (απομάκρυνση του CaO από το συνολικό C-S-H) [18,21,22,24,118].…”

Section: έρευνες σχετικά με την εμφάνιση του ταουμασίτηunclassified

Διερεύνηση Και Ερμηνεία Της Συμπεριφοράς Ασβεστολιθικών Τσιμέντων Σε Συνδυασμένο Περιβάλλον Χλωριόντων Και Θειικών Ιόντων

Sotiriadis¹,

Σωτηριάδης²

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Durability of mortars modified with metakaolin

Cited by 187 publications

References 3 publications

Durabilidad del hormigón armado expuesto a condiciones agresivas

Durabilidad del hormigón armado expuesto a condiciones agresivas

The Influence of Metakaolin from Saaba (Burkina Faso) over Physico-Mechanical and Durability Properties of Mortars

Διερεύνηση Και Ερμηνεία Της Συμπεριφοράς Ασβεστολιθικών Τσιμέντων Σε Συνδυασμένο Περιβάλλον Χλωριόντων Και Θειικών Ιόντων

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