Multi-Scale Experimental Investigation and Analytical Micro-Mechanical Modeling to Determine the Elastic Properties of Alkali Activated Concrete

Multi‐scale modeling for the prediction of Young's modulus of alkali‐activated slag concrete

“…Young's modulus of both soft matrix and hard matrix were found to be equal to 19.1 GPa and 37.6 GPa by nano-indentation tests [18]. The Poisson's ratio is 0.24, as for low-density C-S-H and high-density C-S-H [15].…”

“…This model was validated in [18] for AAS and provides identical results as the Pitzer ion activity model after two days of reaction. The porosity obtained from the model is split into gel porosity for pores lower than 50 nm and capillary water for pores larger than 50 nm.…”

“…The porosity obtained from the model is split into gel porosity for pores lower than 50 nm and capillary water for pores larger than 50 nm. The gel porosity 𝑓 𝑤,𝑔𝑒𝑙 can be predicted by [18]:…”

“…The values of Tänzer et al [24] are dynamic Young's modulus of mortar 𝐸 𝑑𝑦𝑛 . In [18], it was found that the static Young's modulus 𝐸 was equal to:…”

“…𝑓 𝑤,𝑔𝑒𝑙 = 𝜙 𝑔 • 𝑓 𝐶𝐴𝑆𝐻 (10) with 𝜙 𝑔 = 28 % [18] and 𝑓 𝐶𝐴𝑆𝐻 the volume fraction of C-A-S-H gel predicted by the thermodynamic model. The capillary porosity 𝑓 𝑤,𝑐𝑎𝑝 is then obtained with:…”