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Background <p>Ultra High Toughness Cementitious Composites (UHTCC) and Reactive Powder Concrete (RPC) are advanced cementitious materials ideal for explosion/impact-resistant scenarios, yet conventional triaxial tests (≤ 200&#xa0;MPa) leave their 1 GPa-level high-pressure mechanical behavior uncharacterized.</p> Objective <p>This study aims to address the gap in characterizing the mechanical behavior of UHTCC and RPC under high mean pressures at the 1 GPa level, which exceed the capacity of conventional testing methods.</p> Methods <p>An oedometric compression device capable of applying up to 1 GPa of mean pressure was designed and fabricated using 60SiCrVA spring steel. Oedometric compression tests were then conducted to obtain the mechanical behaviors of UHTCC and RPC under 1 GPa of mean pressure. Additionally, based on the data from the oedometric compression tests, the strength surfaces of the HJC model and K&amp;C model, as well as the equation of state (EOS) parameters of the HJC model, for the two materials were calibrated, and a systematic solution process was provided.</p> Results <p>The test results show that RPC has higher strength under high mean pressure, while UHTCC exhibits better plastic deformation capacity. The validity of the oedometric compression tests and the calibrated parameters was verified through numerical simulations, as well as comparisons between the triaxial data from the literature and the experimental data in this study.</p> Conclusions <p>The oedometric compression device designed in this study can apply a mean pressure of up to 1 GPa to specimens, thus complementing the research on the mechanical properties of UHTCC and RPC under 1 GPa-level high mean pressure.</p>

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Comparative Study on High Pressure Mechanical Behavior of UHTCC and RPC Under Oedometric Compression Tests

  • 期刊论文

  • 发表日期：

    2026年5月5日

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  • P. Wu,
  • L. Li,
  • Z. Wang,
  • C. Ma,
  • Y. Zhang,
  • Y. Deng

摘要

Background

Ultra High Toughness Cementitious Composites (UHTCC) and Reactive Powder Concrete (RPC) are advanced cementitious materials ideal for explosion/impact-resistant scenarios, yet conventional triaxial tests (≤ 200 MPa) leave their 1 GPa-level high-pressure mechanical behavior uncharacterized.

Objective

This study aims to address the gap in characterizing the mechanical behavior of UHTCC and RPC under high mean pressures at the 1 GPa level, which exceed the capacity of conventional testing methods.

Methods

An oedometric compression device capable of applying up to 1 GPa of mean pressure was designed and fabricated using 60SiCrVA spring steel. Oedometric compression tests were then conducted to obtain the mechanical behaviors of UHTCC and RPC under 1 GPa of mean pressure. Additionally, based on the data from the oedometric compression tests, the strength surfaces of the HJC model and K&C model, as well as the equation of state (EOS) parameters of the HJC model, for the two materials were calibrated, and a systematic solution process was provided.

Results

The test results show that RPC has higher strength under high mean pressure, while UHTCC exhibits better plastic deformation capacity. The validity of the oedometric compression tests and the calibrated parameters was verified through numerical simulations, as well as comparisons between the triaxial data from the literature and the experimental data in this study.

Conclusions

The oedometric compression device designed in this study can apply a mean pressure of up to 1 GPa to specimens, thus complementing the research on the mechanical properties of UHTCC and RPC under 1 GPa-level high mean pressure.