RILEM TC 258-AAA Round Robin Test: Alkali release from aggregates and petrographic analysis. Critical review of the test method AAR-8

E.  Menéndez; A.  Santos-Silva; I.  Fernandes; J.  Duchesne; M.  Berra; K.  de Weerdt; Y.  Salem; R.  García-Rovés; D.  Soares; B.  Fournier; T.  Mangialardi; J.  Lindgård

doi:10.3989/mc.2022.17021

Autores/as

E. Menéndez Institute Eduardo Torroja of Construction Science https://orcid.org/0000-0001-6461-4798
A. Santos-Silva National Laboratory for Civil Engineering - LNEC https://orcid.org/0000-0001-8002-0682
I. Fernandes University of Lisbon/IDL https://orcid.org/0000-0002-6386-619X
J. Duchesne University Laval https://orcid.org/0000-0002-6327-4864
M. Berra R.S.E.S.p.A. https://orcid.org/0000-0003-2405-3062
K. de Weerdt SINTEF https://orcid.org/0000-0001-8705-8413
Y. Salem Institute Eduardo Torroja of Construction Science https://orcid.org/0000-0002-4823-3802
R. García-Rovés Institute Eduardo Torroja of Construction Science https://orcid.org/0000-0003-0961-3447
D. Soares National Laboratory for Civil Engineering - LNEC https://orcid.org/0000-0002-0409-2446
B. Fournier University Laval https://orcid.org/0000-0003-1469-4755
T. Mangialardi University of Rome https://orcid.org/0000-0003-0886-202X
J. Lindgård SINTEF https://orcid.org/0000-0003-3489-8819

DOI:

https://doi.org/10.3989/mc.2022.17021

Palabras clave:

Lixiviación de álcalis, Áridos, Reacción árido-álcali, Composición química, Metodología

Resumen

Con el fin de crear una recomendación internacional sobre la lixiviación de álcalis de los áridos, se desarrolló el método de ensayo AAR-8 en el ámbito de las actividades de RILEM TC 258-AAA. El primer Round Robin Test (RRT1) de AAR-8 se realizó utilizando cinco tipos áridos y se llevó a cabo una investigación adicional como RRT2 que condujo a la versión final de la recomendación AAR-8 publicado recientemente. Se sumergieron cinco áridos con diferente mineralogía y origen (fonolita, cataclasita, granodiorita, granito y una arena dragada de mar) en volúmenes específicos de soluciones de NaOH o KOH con exceso de hidróxido de calcio mantenido a 38 ° C y 60 ° C. A las 2, 6, 13, 26 y 52 semanas, se extrajeron muestras de la solución de prueba de inmersión mediante pipeteo y se analizaron químicamente para determinar el potasio (solución de prueba de NaOH) o sodio (solución de prueba de KOH). La cantidad de álcalis lixiviados se expresó en gramos de Na₂O, K₂O y Na₂O_e por kilogramo de áridos. En este artículo, se presentan los resultados obtenidos de los álcalis lixibiables por los áridos probados se presentan en los cinco laboratorios participantes. A partir de los datos obtenidos, se proponen varios cambios en la versión original del método de prueba para mejorarlo.

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Citas

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