Multiscale poro-creep model for cement-based materials

作者：Gu Shui Tao; Bary Benoit^*; He Qi Chang; Thai Minh Quan

来源：International Journal for Numerical and Analytical Methods in Geomechanics, 2012, 36(18): 1932-1953.

DOI：10.1002/nag.1080

• creep
• homogenization
• cement-based materials
• capillary pressure
• adsorbed water
• numerical simulations

Experimental observations clearly show that the relative humidity (hr) conditions influence significantly the creep behavior of cement-based materials, indicating that the water present within these materials plays a crucial role. This work presents a creep model for hardened cement pastes (HCP), based on a multiscale homogenization approach. It takes into account both free and adsorbed water contained in the porosity and investigates their effects on the HCP macroscopic creep behavior. The calcium silicate hydrate phase is assumed to be linear viscoelastic, and the MoriTanaka scheme is applied in the LaplaceCarson space to the composite formed of porosity, calcium silicate hydrate, and the other main hydrated compounds (which behavior is linearly elastic) by making use of the correspondence principle. With this model, estimations of the evolution of the macroscopic creep behavior of HCP submitted to constant external loading are examined under different hr and compared with available experimental data. Finally, a method for implementing the model in a finite element code is proposed, and simulations of standard creep tests are performed to assess its validity.

• 出版日期2012-12-25
• 单位中国地震局