Journal Published Online: 21 January 2020
Volume 49, Issue 1

Characterization of Freeze-Thaw Resistance of New-to-Old Concrete Based on the Ultrasonic Pulse Velocity Method

CODEN: JTEVAB

Abstract

The adhesive interface in new-to-old concrete widely occurs in the concrete structure, and the adhesion assessment for freeze-thaw (F-T) resistance is hardly focused on. To evaluate the F-T resistance of adhesive interfaces in new-to-old concrete with a nondestructive method, this experiment was conducted with ultrasonic pulse velocity (UPV). Specimens with the same natural roughness were obtained using three-dimension printing technology. The surface roughness was measured via the sand replacement method. The traditional evaluation that the decrease of relative dynamic elastic modulus under 60 % represents the failure of concrete F-T resistance has a limitation in new-to-old concrete structures. A new characterization method of F-T resistance in adhesive interface for new-to-old concrete was proposed based on the variation trend of UPV in parallel direction (UPV-PD) and vertical direction (UPV-VD). The UPV-VD loss ratio had a three-stage characteristic and a steady phase, which was different from the loss ratio of splitting tensile strength in numerical value. The results showed that the UPV-PD loss ratio grew linearly in the process of F-T cycles. Moisture content was the dominant influence on the numerical difference. This difference can be eliminated based on a correction method. The variation trend of the UPV loss ratio in adhesive interfaces was similar to that of splitting tensile strength, and the obvious turning points appeared after similar F-T cycles. The characterization method of F-T resistance proposed in this article is applicable to evaluate the F-T resistance of adhesive interfaces in new-to-old concrete, which is also proved by splitting tensile test results.

Author Information

Zhu, Hongguang
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, China
Fan, Jingchong
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, China
Yi, Cheng
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, China
Ma, Hongqiang
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, China
Chen, Hongyu
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, China
Shi, Jing
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, China
Xu, Xiaonan
School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, China
Pages: 14
Price: $25.00
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Stock #: JTE20190639
ISSN: 0090-3973
DOI: 10.1520/JTE20190639