Journal Published Online: 26 February 2025
Volume 53, Issue 2

Methodology for Using LWD Data at Different Curing Times to Assess On-Site Properties of Cement-Bitumen Treated Materials

CODEN: JTEVAB

Abstract

Full-depth reclamation with hydraulic and bituminous binders, also known as cement-bitumen treated materials (CBTMs), is a cost-effective and eco-friendly road rehabilitation method that fully reutilizes preexisting local materials. The mechanical behavior of stabilized materials changes over time due to curing, which is crucial for long-term performance, so adapted on-site quality control (QC) strategies are necessary. This article proposes a methodology for using lightweight deflectometer (LWD) experimental data to assess CBTM properties at different locations and curing times using backcalculation. Multiple data processing techniques and four backcalculation methods for modulus values are introduced: (1) the surface modulus obtained by Love’s solution using only one deflection (ES1Love); (2) the surface modulus obtained by Love’s solution using three deflections (ES3Love); (3) the surface modulus obtained by a finite element–based backcalculation approach using three deflections (ES3FEM), considering the pavement as composed as one single semi-infinite layer; and (4) the elastic modulus of the two distinct materials or layers (CBTM and subgrade), backcalculated with the finite element method and using three deflections (ECBTM3FEM and ESG3FEM). Comparisons between surface modulus (ES) and the moduli set (ECBTM and ESG) demonstrate the fourth method effectively assesses each material’s contribution to pavement stiffness, which is important in evaluating the CBTM layer. The research concludes that LWD is an efficient QC tool for CBTM and that using backcalculated elastic moduli for the separated layers provides better results than the surface modulus for monitoring material evolution over curing time, and this may be important in the case of CBTMs.

Author Information

Furtado, Lia Beatriz Gomes
Departamento de Engenharia Estrutural e Construção Civil, Universidade Federal do Ceará, Campus do Pici, Acesso Público, Fortaleza, Ceará, Brazil
Lamothe, Sébastien
Département de génie de la construction, École de Technologie Supérieure, Montréal, Quebec, Canada
de Oliveira, José Lucas Ferreira
Departamento de Engenharia Estrutural e Construção Civil, Universidade Federal do Ceará, Campus do Pici, Acesso Público, Fortaleza, Ceará, Brazil
Lachance-Tremblay, Éric
Département de génie de la construction, École de Technologie Supérieure, Montréal, Quebec, Canada
Babadopulos, Lucas Feitosa de Albuquerque Lima
Departamento de Engenharia Estrutural e Construção Civil, Universidade Federal do Ceará, Campus do Pici, Acesso Público, Fortaleza, Ceará, Brazil
Bastos, Juceline Batista dos Santos
Departamento de Construção Civil, Instituto Federal de Educação, Ciência e Tecnologia do Ceará, Fortaleza, Ceará, Brazil
Parente, Evandro
Departamento de Engenharia Estrutural e Construção Civil, Universidade Federal do Ceará, Campus do Pici, Acesso Público, Fortaleza, Ceará, Brazil
Pages: 16
Price: $25.00
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Stock #: JTE20240246
ISSN: 0090-3973
DOI: 10.1520/JTE20240246