Abstract
Calcium hydroxide produced by cement hydration decreases durability of concrete placed in aggressive solutions and fibrereinforced cement composites. Pozzolanic properties of metakaolin allow to avoid this drawback. In the present study the effect of a microwave curing on lime consumption in metakaolin blended cements was investigated. The microwave treatment conditions were assessed for plain portland cement pastes, then the lime consumption for various metakaolin contents was evaluated by Fourier transform infrared spectrometry and differential thermal analysis. The results were compared with those obtained for room temperature curing. It was found that the pozzolanic activity of metakaolin increased under microwave treatment. Binders containing 15% metakaolin were free of calcium hydroxide, while 30 or 40% metakaolin were needed at room temperature curing.
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