Nuclear magnetic resonance analysis of freeze-thaw damage in natural pumice concrete

Xiaoxiao Wang; Xiangdong Shen; Hailong Wang; Chu Gao; Tong Zhang

doi:10.3989/mc.2016.09014

Autores/as

Xiaoxiao Wang College of Civil Engineering, Inner Mongolia University of Technology - College of Water Conservancy and Civil Engineering , Inner Mongolia Agricultural University
Xiangdong Shen College of Water Conservancy and Civil Engineering , Inner Mongolia Agricultural University
Hailong Wang College of Water Conservancy and Civil Engineering , Inner Mongolia Agricultural University
Chu Gao College of Water Conservancy and Civil Engineering , Inner Mongolia Agricultural University
Tong Zhang College of Water Conservancy and Civil Engineering , Inner Mongolia Agricultural University

DOI:

https://doi.org/10.3989/mc.2016.09014

Palabras clave:

Hormigón de piedra pómez natural, Propagación de daños, Resonancia magnética nuclear (RMN), Porosidad, Tiempo de relajación

Resumen

En este trabajo se analiza la propagación de los daños que se producen en la estructura porosa de hormigón aligerado a base de piedra pómez natural sometido a la acción cíclica de hielo-deshielo. Después de realizarse los ensayos de hielo-deshielo, el hormigón se analizó mediante resonancia magnética nuclear (RMN), determinándose la porosidad y la distribución del tiempo de relajación transversal, T₂, y registrándose las imágenes captadas por resonancia magnética. De acuerdo con los resultados obtenidos, antes de los ciclos de hielo-deshielo la distribución de T₂ del hormigón aligerado presentaba cuatro picos, indicativos de un predominio de poros pequeños. Después de que se sometiera a 50, 100, 150, y 200 ciclos, se observó un aumento importante tanto de la porosidad como de la superficie total del espectro de T₂. Las imágenes captadas por resonancia magnética evidenciaron la modificación de la distribución espacial de los poros del hormigón aligerado durante el ensayo. Por otra parte, mediante la comprobación por técnicas de prospección ultrasónica se confirmó que la nueva tecnología RMN es de alta precisión y gran practicidad en la investigación de los daños producidos en el hormigón por los ciclos de hielo-deshielo.

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