The effect of hydrophobic agent on rheological properties of modified plasters is analyzed in this paper. Influence of time and external temperature (10, 20 and 30°C) on samples is examined. Main aim of rheological test is determination of flow curves, obtained by applying a succession of constant strain rates for short times. On the basis of the experiments performed, it can be concluded that the both time and temperature have very significant influence on rheological properties same as hydrophobic addition. A comparative measurement with pure metakaolin-lime plaster was done as well.
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