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Adequacy of Standard Models for Long-Term Behavior of Lightweight Concrete with Sintered Aggregate Under Cyclic Loading.

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Rheological Features and Hereditary Models of Lightweight Sintered Aggregate Concrete Under Cyclic Loading.

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Summary

Hereditary creep models accurately predict lightweight aggregate concrete (LWAC) rheology under cyclic loads. These models offer a simpler, effective alternative to standard models for designing prestressed LWAC structures.

Keywords:
creephereditary creep modelslightweight sintered aggregate concreterheological testsshrinkage

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Standard models for lightweight aggregate concrete (LWAC) exhibit complexity and require extensive calibration.
  • Previous analysis indicated limitations of standard models in accurately representing LWAC rheological properties under cyclic loading.
  • Hereditary creep theories offer a potential alternative for modeling LWAC behavior.

Purpose of the Study:

  • To compare analytical results from two hereditary creep models with experimental data for LWAC.
  • To evaluate the suitability of hereditary creep models for LWAC subjected to cyclically varying loads.
  • To identify effective long-term models for LWAC rheology.

Main Methods:

  • Applied two hereditary creep models: Arutiunian theory with aging and modified hereditary theory with Bažant aging function.
  • Formulated total strain as a superposition of strain increments using an integral equation.
  • Analyzed model performance against experimental rheological data of LWAC under cyclic loading.

Main Results:

  • The Arutiunian theory and modified hereditary theory provided quantitatively and qualitatively accurate results for LWAC.
  • Hereditary creep theory successfully described strain increments under cyclic stress variations using an integral equation.
  • These models demonstrated superior performance compared to standard models without extensive calibration.

Conclusions:

  • Hereditary creep models, particularly Arutiunian and modified hereditary theories, are effective for predicting LWAC rheological properties under cyclic loads.
  • These models simplify the analysis of LWAC behavior, making them suitable for practical engineering applications.
  • Accurate long-term modeling of LWAC is crucial for designing prestressed concrete structures subjected to time-varying loads.