Evaluation of the effect of nanosilica in the frost resistance of concrete through ultrasound

M.J. Rodriguez-Roblero

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: INFRASTRUCTURE - II Highways & Bridges

ABSTRACT: This paper presents the results of the evaluation of frost resistance of a concrete-nanosilica mix using ultrasonic velocity and attenuation measurements. The study had two objectives: to evaluate the effect of nanosilica on frost resistance, and to investigate the potential of ultrasonic measurements to assess internal damage. The tests are part of a broader study to evaluate the effect of nanosilica to improve the durability of concrete pavements. In cold weather conditions, pavement performance is drastically reduced because of deterioration from freeze/thaw cycles. Frost resistance is traditionally evaluated using two standard procedures: the resonance method (ASTM C666/C666M-03 2008) and the ultrasonic pulse velocity method (ASTM C597-09 2009); yet, the resonance method can only detect significant damage; and the pulse velocity method has a limited sensitivity in detecting internal damage. These limitations suggest the need of complementary procedures to better assess frost damage. In this work, an alternative method based on the attenuation of ultrasonic waves was used in conjunction with the standard methods to evaluate the condition of concrete specimens with varying nanosilica content. The results indicate that attenuation measurements are more sensitive to damage than the standard methods.

RÉSUMÉ: Cet article présente les résultats recherche avait deux objectifsrésistance au gel et examiner le potentiel de détection de dommages internes offert par les mesures ultrasonores. Ces à améliorer la durabilité des chaussées de béton. Dans les régions froides, la performance des chaussés est affectée par la détérioration provoquée par des cycles du gel-dégel. Traditionnellement, la résistance au gel est évaluée en utilisant deux méthodes standardisées: la méthode de la résonance (ASTM C666/C666M-03 2008) ou la méthode de vitesse ultrasonique (ASTM C597-09 2009). Cependant, la méthode de la résonance ne peut détecter que des dommages considérables et la méthode de la vitesse ultrasonique complémentaires pour évaluer les dommages causés par le gel. Dans cette recherche, une méthode alternative basée des échantillons de béton avec différentes doses de nanosilice. Les résultats démontrent que les mesures de

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