Computer models for cement hydration has been proven to be a useful tool for
understanding the chemistry of cement hydration, simulating the microstructure
development of hydrating paste and predicting the properties of the hydration process /1/.
One of these advanced models is CEMHYD3D, which is used and extended within the
University of Twente for the last 12 years with pore water chemistry /2/, slag cement /3/
and multi-time modeling /4/. Chen and Brouwers /5/ pointed out that the smallest size
handled in CEMHYD3D, called the ‘system resolution’ is important for a digitized model.
Features smaller than the voxel sizes cannot be represented since the model works based on
the movement and phase change of each discrete voxel. Furthermore, the system resolution
determines the amount of computing time needed for a specific task, a higher system
resolution will lead to longer computational time. Due to better computational possibilities,
the use of higher resolutions is possible nowadays.
This article shows the effects of using different resolutions with CEMHYD3D. This is done
for the ‘fresh’ mixtures as well as during hydration modeling of the binder. The model has
been modified to cope with several different resolutions from 0.20-2 μm (or 500-50 voxels
in the system in a box of 100 μm x 100 μm x 100 μm). This paper shows two methods for
the multi-scale modeling. The first method consists of a system, which use a modified
PSD-line for each resolution. The second method uses the same digitized initial
microstructure, but in stead of 1 voxel of 1 x 1 x 1 μm3 for 200 μm-system 8 voxels of 0.5
x 0.5 x 0.5 μm3 are used and for the 300-μm system 27 voxels of 0.33 x 0.33 x 0.33 μm3.
|Publisher||F.A. Finger-Institut fur Baustoffkunde|
|Conference||17th Internationale Baustofftagung|
|Period||23/09/09 → 26/09/09|
|Other||23-26 September 2009|