PSI - Issue 73

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 73 (2025) 45–50

23rd International Conference on Modelling in Mechanics 2025 Assessment of the quality of the joint between the old and new protective layers of mastic asphalt on engineering objects Robert Jurczak a, * a Department of Construction and Road Engineering, Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, 50a Piastów Avenue, Szczecin, Poland Abstract The protective layer of the pavement on engineering objects, usually made of mastic asphalt, safeguards the waterproofing system and additionally protects the structure from the damaging effects of water and de-icing agents. This paper presents an experimental study on the joint between previously laid (old) mastic asphalt and newly applied material. The strength of the joint was evaluated using small-scale specimens tested under flexural conditions. The tests were conducted at two temperatures: -2°C and -10°C. The obtained results were used to assess the performance of longitudinal joints executed with and without self adhesive bituminous tape. The key finding is that the use of bituminous tape did not provide any significant improvement in bond strength between the old and new mastic asphalt layers. Failure in the taped specimens consistently occurred at the interface between the tape and the old asphalt, indicating adhesive failure and lack of true monolithic behavior. This demonstrates that the commonly used taping method may be ineffective in ensuring joint integrity, as even with the tape, the strength remained at the same level as for joints without tape. For comparison, the flexural strength of the monolithic reference beams was approximately twice as high as that of the jointed specimens. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers Keywords: Mastic asphalt; longitudinal joint; protective layer; engineering objects © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the event organizers

* Corresponding author. E-mail address: Robert.Jurczak@zut.edu.pl

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of 23rd International Conference on Modelling in Mechanics 2025 organizers

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the event organizers 10.1016/j.prostr.2025.10.008