|Table of Contents|

Low-temperature performance and evaluation method of sealants in cold regions(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2025年5期
Page:
41-53
Research Field:
道路工程
Publishing date:

Info

Title:
Low-temperature performance and evaluation method of sealants in cold regions
Author(s):
WANG Wei1; 2;  HE Rong-sen1;  SHI Jia-le1;  LIU Ru-da1;  CHEN Zhi-guo2;  SHEN Ruo-ting2
(1. School of Civil Engineering, Changchun Institute of Technology, Changchun 130012, Jilin, China; 2. Jilin Provincial Transport Scientific Research Institute, Changchun 130012, Jilin, China)
Keywords:
Key words:pavement engineering;  cold region;  sealing material;  short-term aging;  low-temperature tensile;  dissipated energy method
PACS:
U416.217
DOI:
10.19721/j.cnki.1671-8879.2025.05.004
Abstract:
To address the deficiency in current specifications that insufficiently consider the coupledeffects of multiple factors such as high-temperature aging, water immersion, and freeze-thaw cycles whenevaluating the long-term performance of sealants in cold regions, four -20 ℃ and four -30 ℃ heated type sealant samples commonly used in road maintenance projects in cold regions were selected for systematicexperimental research. By simulating typical working conditions in actual cold region environments, theevolution patterns of adhesive performance of sealants after short-term high-temperature aging, low-temperature water immersion, and freeze-thaw cycles were tested, respectively. An improved dissipatedenergy method was proposed to more scientifically evaluate the long-term durability of sealants incomplex environments. The research results show that high-temperature aging significantly weakens theadhesive performance of sealants. The adhesion of some samples decreases by up to 40%, indicating thatthe thermo-oxidative aging is an important factor causing the material performance degradation. Freeze-thaw cycles further accelerate the attenuation of adhesive performance, with the maximum decreasereaching 60%. The cumulative damage should not beignored. After low-temperature water immersion, the sealants exhibit an apparent increase in adhesion dueto the temporary adhesive effect of ice crystals, suggesting that during the evaluation, it is necessary todistinguish between true adhesion and temporary enhancement effects. The proposed improved dissipatedenergy method accurately identifies the peak load bearing state during the stretching-tensile fracturing process, removes invalid or interfering dissipated energy parts after the peak, and significantly improves theaccuracy of performance evaluation under low-temperature conditions. This method can effectivelycapture the dynamic changes in the adhesive performance of sealants under different conditions such asunaged, short-term aging, water immersion, and freeze-thaw cycles at -30 ℃ and -20 ℃. It clearly reveals the material performance degradation patterns and long-term service potential. Compared withcurrent specifications and traditional dissipated energy method, this method not only comprehensivelyconsiders multiple environmental factors in actual cold region environments such as extreme low-temperature, temperature fluctuation, water intrusion, and freeze-thaw damage, but also scientificallydistinguishes the performance differences between different sealants under specific environmental stresses.The evaluation results are more environmentally targeted and engineering applicable. In conclusion, theproposed experimental and evaluation methods can provide important supplements for material selectionand performance evaluation of sealants in cold regions and offer theoretical basis and data support for therevision of relevant specifications.4 tabs, 13 figs, 31 refs.

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Last Update: 2025-09-30