MULTIOBJECTIVE OPTIMIZATION OF CEMENT PASTE PERFORMANCE

Abstract eng:
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. W/c is the only governing factor for the Young’s modulus at the above-mentioned degrees of hydration or times. 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. In this particular case, the Pareto set clearly shows the importance of w/c parameter.

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