First 2D simulations

Using digital imaging from reacted structure samples, we managed to run a 2D simulation for ASR expansion (size of 9.6 cm x 9.6 cm) .

Using thresholding and edge detection images are convereted to binary images. Three Phases (aggregate - mortar - ITZ) identified and superimposed with a lattice mesh including (79600 beam elements). Based on earlier studies (Schlangen and Copuroglu, 2010) material properties are assigned and expansion is defined on all interfacial transition zone (ITZ) elements.

Cracked beam elements after 3000-8000-20000 steps.

First attempts assumed local lodings on the ITZ elements only and swelling to start simultaneously. Currently we are working on identification reactive components in a 2D medium and implementing non-simultaneous expansion patterns in the section. After execution of small scale testing device we will have more insights about pressure progress and gel propeties (those details for another post). Alternate reactive regions and shifted timing regimes to be defined later on.

Deformed version of sample after 20000 steps

Still a lot to do, in modeling but first results seems promising for improvement.



Schlangen, E. and C. Copuroglu (2010). Modeling of expansion and cracking due to ASR with 3D lattice model. Framcos7, Jeju, Korea.