Falling weight impact acceleration-time signals analysis for road modulus detection: Theoretical and experimental investigations

Structural modulus detection is essential for construction and maintenance in road engineering. Falling weight impact loading method has significant strengths in large-scale, continuous, and rapid detection. To provide theoretical support for this, theoretical analysis and falling weight impact experiments were employed in this study to investigate the influence of road structure parameters and falling weight impact parameters on impact acceleration-time signals. First, the applicability of the Hertz model in road detection was analyzed, and theoretical formulas for peak acceleration amax and impact duration 𝑡₂ were established, considering the perfectly elastic collision between falling weight and half-space. Second, the influence of layered structures’ properties on impact acceleration-time curves was studied through model box impact experiments. Third, field tests were conducted to study engineering applications. The results showed that the influence patterns were similar in both theoretical and experimental studies, with differences reflected in the time of compression and restitution phases due to the road materials’ viscosity and plasticity. Additionally, in indoor experiments, amax showed an excellent power function relationship with structural layer modulus, with 𝑅² more than 0.95, and the contribution of each layer’s modulus to amax decreased from top to bottom. Finally, 𝑎 ₘₐₓ and resilient modulus of an old road also followed a good power function relationship, with 𝑅² around 0.76. This study revealed that 𝑎 ₘₐₓ was recommended for road surface modulus detection based on solid theoretical and experimental support.

• Record URL:
  • https://doi.org/10.1016/j.cscm.2024.e03915
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S2214509524010660
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/22145095
• Supplemental Notes:
  • © 2024 The Authors. Published by Elsevier Ltd. Abstract reprinted with permission of Elsevier.
• Authors:
  • Xu, Xinnan
  • Zhao, Mohan
  • Liu, Yu
  • Wu, Chaofan
  • Pei, Yuhao
  • Zhang, Chengmiao
• Publication Date: 2024-12

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: e03915
• Serial:
  • Case Studies in Construction Materials
  • Volume: 21
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 2214-5095
  • Serial URL: http://www.sciencedirect.com/science/journal/22145095

Subject/Index Terms

• TRT Terms: Falling weight deflectometers; Highway engineering; Impact loads; Impact tests; Modulus of deformation
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01937305
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 18 2024 5:09PM