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<p>This study investigates the flexural behavior of cementitious mortars modified with recycled polyethylene terephthalate (RPET) through experimental testing and finite element modeling using SolidWorks Simulation. Prismatic specimens containing 10% and 20% RPET were subjected to three temperature levels (20&#xa0;°C, 150&#xa0;°C, and 350&#xa0;°C) and two curing conditions (ambient and water curing).The results show a progressive decrease in flexural strength and an increase in displacement with rising temperature, particularly at higher RPET contents. Water-cured specimens exhibited improved mechanical performance and reduced deformation compared to ambient-cured specimens.A linear elastic finite element model was developed to analyze stress distribution and deformation patterns. However, due to its linear elastic formulation, the model does not simulate crack initiation, crack propagation, interfacial debonding, stiffness degradation, or post-peak failure evolution. Although the model reproduces general trends, its predictive capability is limited due to the use of constant material properties independent of temperature and the absence of nonlinear damage modeling. Therefore, the numerical results are restricted to a simplified representation of pre-failure behavior and should be interpreted as a qualitative or semi-quantitative consistency assessment.The findings highlight the combined influence of RPET content, thermal exposure, and curing conditions on mortar behavior, emphasizing the need for advanced modeling approaches to accurately capture failure mechanisms. The reported trends should be interpreted with caution due to the limited number of specimens tested per condition.</p>

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Finite Element Modeling of the Flexural Behavior of Mortars Modified with Recycled Polyethylene Terephthalate Under Thermal

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • María Eugenia Maciá Torregrosa,
  • Melany Isabel Pinilla Hernández,
  • Javier Camacho Diez,
  • Carlos Machín Hamalainen,
  • Roberto Alonso Gonzalez-Lezcano

摘要

This study investigates the flexural behavior of cementitious mortars modified with recycled polyethylene terephthalate (RPET) through experimental testing and finite element modeling using SolidWorks Simulation. Prismatic specimens containing 10% and 20% RPET were subjected to three temperature levels (20 °C, 150 °C, and 350 °C) and two curing conditions (ambient and water curing).The results show a progressive decrease in flexural strength and an increase in displacement with rising temperature, particularly at higher RPET contents. Water-cured specimens exhibited improved mechanical performance and reduced deformation compared to ambient-cured specimens.A linear elastic finite element model was developed to analyze stress distribution and deformation patterns. However, due to its linear elastic formulation, the model does not simulate crack initiation, crack propagation, interfacial debonding, stiffness degradation, or post-peak failure evolution. Although the model reproduces general trends, its predictive capability is limited due to the use of constant material properties independent of temperature and the absence of nonlinear damage modeling. Therefore, the numerical results are restricted to a simplified representation of pre-failure behavior and should be interpreted as a qualitative or semi-quantitative consistency assessment.The findings highlight the combined influence of RPET content, thermal exposure, and curing conditions on mortar behavior, emphasizing the need for advanced modeling approaches to accurately capture failure mechanisms. The reported trends should be interpreted with caution due to the limited number of specimens tested per condition.