Multi-scale hydration modeling of calcium sulphates

A.C.J. Korte, de, H.J.H. Brouwers

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

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 ?m (or 500-50 voxels in the system in a box of 100 ?m x 100 ?m x 100 ?m). 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 ?m3 for 200 ?m-system 8 voxels of 0.5 x 0.5 x 0.5 ?m3 are used and for the 300-?m system 27 voxels of 0.33 x 0.33 x 0.33 ?m3
Original languageEnglish
Title of host publicationProceedings of the 17th International Conference on Building Materials (Ibausil), 23-26 September 2009, Weimar, Germany
EditorsH.B. Fischer, K.A. Bode
Place of PublicationWeimar, Germany
PublisherBauhaus-Universität Weimar
Pages413-418
ISBN (Print)978-3-00-027265-3
Publication statusPublished - 2009
Event17. Internationale Baustofftagung "ibausil", 23.-26. September 2009, Weimar, Deutschland - Weimar, Germany
Duration: 23 Sep 200926 Sep 2009

Conference

Conference17. Internationale Baustofftagung "ibausil", 23.-26. September 2009, Weimar, Deutschland
CountryGermany
CityWeimar
Period23/09/0926/09/09

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