Resilient moduli of demolition wastes in geothermal pavements: Experimental testing and ANFIS modelling

Construction and demolition (C&D) waste materials have been used in a wide range of civil engineering applications, particularly in unbound pavements applications. A comprehensive understanding of the deformation and thermal properties of C&D materials is necessary for their usage in novel applications related to heat transfer in pavement unbound layers, such as geothermal pavements. This research study focused on developing a correlation between the resilient modulus (MR) and thermal conductivity of C&D materials for geothermal pavements applications. The thermal conductivity of C&D materials, namely recycled concrete aggregate (RCA), crushed brick (CB), reclaimed asphalt pavement (RAP), and waste rock (WR), was evaluated at different moisture contents and dry densities. The MR and permanent deformation responses of C&D materials were characterized at the optimum moisture content (OMC), 85%OMC, and 70%OMC, using the repeated load triaxial (RLT) test. The average values of the MR for RCA, RAP, CB, and WR when prepared at OMC were 381 MPa, 258 MPa, 182 MPa, and 144 MPa, respectively. An intelligent model was developed for prediction of MR of C&D materials considering thermal conductivity as an input parameter using the adaptive neuro-fuzzy inference system (ANFIS) approach. The developed ANFIS model incorporated thermal conductivity along with physical properties, confining stress, and deviator stress as input parameters. The developed ANFIS model had excellent performance in predicting the MR of C&D materials, with R2 = 0.99 for both training and testing datasets. The ANFIS model was converted into a mathematical relationship, which can be used by researchers and practitioners for estimation the MR.

• Record URL:
  https://doi.org/10.1016/j.trgeo.2021.100592
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S2214391221000829
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/22143912
• Supplemental Notes:
  • © 2021 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Ghorbani, Behnam
  • Arulrajah, Arul
  • Narsilio, Guillermo
  • Horpibulsuk, Suksun
  • Leong, Melvyn
• Publication Date: 2021-7

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Pagination: 100592
• Serial:
  • Transportation Geotechnics
  • Volume: 29
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 2214-3912
  • Serial URL: http://www.sciencedirect.com/science/journal/22143912

Subject/Index Terms

• TRT Terms: Geothermal resources; Mathematical models; Modulus of resilience; Recycled materials; Rubble; Statistical inference; Thermal conductivity
• Subject Areas: Geotechnology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 01777006
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 23 2021 3:23PM