Calibration of a Multiphase Model Based on a Comprehensive Data Set for a Normal Strength Concrete

Area of Science:

• Civil Engineering
• Materials Science
• Computational Mechanics

Background:

• Time-dependent concrete behavior is crucial for structural integrity.
• Accurate hygro-thermo-chemo-mechanical modeling demands precise parameter determination.
• Existing models may lack comprehensive calibration for specific concrete grades.

Purpose of the Study:

• To calibrate a multiphase model for concrete using experimental data.
• To validate the model's predictive capabilities for various time-dependent phenomena.
• To assess the model's accuracy for different loading and environmental conditions.

Main Methods:

• Calibrated a multiphase model using experimental data from C30/37 concrete.
• Conducted calorimetry, mechanical property, desorption isotherm, shrinkage, and creep tests.
• Utilized sealed and unsealed specimens with mass water content measurements.

Main Results:

• The multiphase model accurately predicted mechanical parameter evolution.
• Autogenous shrinkage, creep compliance, and mass water content were well predicted.
• Drying shrinkage was accurately predicted for up to one year of moderate drying.

Conclusions:

• The calibrated multiphase model provides excellent predictions for concrete's time-dependent behavior.
• The model's accuracy for drying shrinkage requires further investigation for longer durations.
• Further research is needed on coupled shrinkage and creep representation for extended drying periods.