Evaluation of laboratory test methods for assessing the alkali-reactivity potential of aggregates by field site tests

I.  Borchers; J.  Lindgård; C.  Müller

doi:10.3989/mc.2022.17221

Autores/as

I. Borchers VDZ Technology gGmbH https://orcid.org/0000-0002-4126-3267
J. Lindgård SINTEF Community https://orcid.org/0000-0003-3489-8819
C. Müller VDZ Technology gGmbH https://orcid.org/0000-0003-2138-9783

DOI:

https://doi.org/10.3989/mc.2022.17221

Palabras clave:

Prueba acelerada de barra de mortero, Clima, Prueba de prisma de hormigón, Prueba de campo, Áridos moderadamente reactivos

Resumen

Se realizaron pruebas de campo para evaluar la fiabilidad de los ensayos desarrollados por RILEM y algunos ensayos regionales para evaluar la reactividad alcalina potencial de los áridos (se incluyeron ocho ensayos). Se almacenaron 100 cubos de hormigón fabricados con 13 combinaciones diferentes de áridos europeos, en ocho emplazamientos europeos distintos, para comparar sus expansiones con los resultados de las pruebas de laboratorio. Todas las combinaciones de áridos altamente reactivos provocaron una expansión significativa de los cubos de hormigón durante los primeros seis años en todos los emplazamientos de campo, desde Noruega hasta España; éstas y las combinaciones de áridos no reactivos se identificaron correctamente con todas las pruebas de laboratorio. Los cubos de hormigón con combinaciones de áridos moderadamente reactivos se expandieron muy lentamente y principalmente en los lugares de exposición exterior con condiciones climáticas cálidas. El método de ensayo RILEM AAR-4.1 (ensayo acelerado de prisma de hormigón a 60°C) y el ensayo de prisma de hormigón noruego a 38°C parecen ser los más adecuados para identificar la reactividad potencial de las combinaciones de áridos moderadamente reactivos.

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Citas

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