Experimental and Numerical Evaluation of Fracture Characteristics of Stabilized Cement Base Containing Reclaimed Asphalt Pavement

Document Type : Research Paper

Authors

1 Assistant Professor, Transportation Research Institute, Road, Housing and Urban Development Research Center, Tehran, I.R. Iran.

2 Assistant Professor, Civil and Environmental Engineering Department, University of Hormozgan, Bandar Abbas, I.R. Iran

Abstract

The stabilization of the foundational layer utilizing cement facilitates the formation of a robust stratum that supports the upper layer of the pavement. Nevertheless, to accurately ascertain the precise properties of this composite material under various loading scenarios, it is imperative to establish a dependable and accessible methodology for assessing the failure characteristics. Consequently, the investigation undertaken in this study has introduced a loading configuration referred to as the grooved bending disc (ENDB), which has been scrutinized and implemented within the domain of fracture mechanics pertaining to cement-stabilized base layers. In this inquiry, stress intensity factors were derived from the principles of linear elastic fracture mechanics, employing three-dimensional analysis and the ABAQUS software across diverse loading conditions and geometric parameters. Furthermore, to derive stress intensity factors without resorting to numerical methodologies, the outcomes procured in the preceding phase were integrated into a comprehensive model utilizing machine learning techniques, specifically through the application of artificial neural networks. The cement base formulation utilized for experimental purposes is of the Portland cement variety, augmented with an inorganic polymer additive to enhance performance characteristics. To assess the fracture toughness, three distinct failure modes were examined, including pure mode I, pure mode II, and pure mode III, each subjected to four repetitions. Based on the findings, the ENDB configuration proposed in this study has been demonstrated to serve as a credible method for evaluating the fracture characteristics of cement-stabilized base mixtures. The incorporation of inorganic polymer enhances fracture resistance across various modes by 8%. The statistical evaluation of residual life indicates that a transition in the loading mode from tensile opening (mode I) to in-plane shear (mode II) results in a substantial decrease in the likelihood of failure. In contrast, the probability of failure in the out-of-plane shear mode (mode III) is considerably elevated relative to the tensile opening (mode I).

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Main Subjects

References

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Journal of Transportation Infrastructure Engineering
Volume 10, Issue 2 - Serial Number 38
September 2024
Pages 97-120

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History

  • Receive Date: 18 August 2024
  • Revise Date: 17 September 2024
  • Accept Date: 21 September 2024

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