On influence of microstructure parameters on cement paste performance: results from micromechanical modelling and optimization

Title: On influence of microstructure parameters on cement paste performance: results from micromechanical modelling and optimization
Author(s): V. Smilauer, M.J. Leps, Z. Vitingerová
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 657 - 663
Total Pages: 7
Nb references: 10
Language: English

Abstract: Resulting properties of hardening cement paste are influenced by several stochastic parameters whose effect has not been yet fully determined. We attempt to explore the sensitivity of parameters on the hydration heat and Young’s modulus covering pastes made from ordinary Portland cement. Virtual modeling is based on CEMHYD3D model, quantifying the effect of cement fineness, its chemical composition, gypsum content, w/c, and curing conditions.
Gypsum content, autocorrelation of clinkers, C4AF and saturated/sealed curing conditions were found to be insensitive in terms of released heat or Young’s modulus, determined either at the degree of hydration of 0.3 and 0.5, or at 3 or 28 days. W/c is the only governing factor for the Young’s modulus at the above-mentioned degrees of hydration or times. Young’s moduli from micromechanical modeling were fitted to analytical power function, depending on the degree of hydration and w/c with the correlation coefficient of 0.986.
Possible application of virtual modeling is demonstrated on multiobjective optimization of cement paste properties. The goal is to minimize hydration heat while maximizing Young’s modulus at 28 days. In this particular case, the Pareto set clearly shows the importance of w/c parameter.

Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00