Assessment of effects of ASR-induced cracking on direct shear strength of recycled concrete

R.  Ziapour; C.  Trottier; A.  Zahedi; L.F.M.  Sanchez

doi:10.3989/mc.2022.17621

Autores/as

R. Ziapour Department of Civil Engineering, University of Ottawa https://orcid.org/0000-0003-3719-450X
C. Trottier Department of Civil Engineering, University of Ottawa https://orcid.org/0000-0002-5669-1977
A. Zahedi Department of Civil Engineering, University of Ottawa https://orcid.org/0000-0002-1084-4202
L.F.M. Sanchez Department of Civil Engineering, University of Ottawa https://orcid.org/0000-0002-2449-5111

DOI:

https://doi.org/10.3989/mc.2022.17621

Palabras clave:

Reacción álcali-sílice, Ensayo de cortante directo, Evaluación microscópica, Índice de clasificación de daños (DRI), Áridos reciclados de hormigón

Resumen

Los áridos reciclados de hormigón (RCA) están siendo utilizados como uno de los métodos más eficientes para reducir la huella de carbono de la industria del hormigón. Sin embargo, el desempeño de las mezclas de hormigón reciclado hechas de RCA afectado por la reacción álcali-sílice (ASR) es en su mayoría desconocido. En el presente trabajo se produjeron dos tipos de RCA a partir del hormigón afectado por ASR con distintos niveles de daño (leve y severo). Se seleccionaron tres niveles de daño secundario (niveles de expansión de 0,05 %, 0,12 % y 0,20 %) y se evaluaron mediante el ensayo a cortante directo. Los resultados revelaron que la resistencia a la cizalladura del hormigón con RCA depende de la severidad de su daño anterior. Además, el comportamiento del hormigón sometido a cortante directo está en acuconcordancia con las características de las fisuras formadas en la microestructura del hormigón reciclado en función de la expansión secundaria inducida por ASR por el índice de clasificación de daños (DRI).

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