Multi-scale experimental investigation and analytical micro-mechanical modeling to determine Young’s modulus of alkali-activated slag concrete

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

“…Level 0 corresponds to the reaction product foam at the scale of a few nanometers. Nanoindentation test results indicated that this reaction product foam was made of two distinct matrices, one softer and one harder including gel water [18]. The amount of soft matrix in the reaction product foam is equal to 78 % and, correspondingly, the amount of hard matrix is equal to 22 %.…”

“…The Poisson's ratio is 0.24, as for low-density C-S-H and high-density C-S-H [15]. Young's modulus and Poisson's ratio of unreacted slag are equal to 68.3 GPa [18] and 0.2 [21], respectively. For sand and aggregates, Young's modulus is equal to 50 GPa [22] and Poisson's ratio is equal to 0.2 [23].…”

“…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:…”