Modification of cement hydration at early ages by natural and heated wood

Alexandre Govin (1, 2, 3) , Arnaud Peschard (1, 2, 3) , René Guyonnet (1, 2, 3)

1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
2 P2MC-ENSMSE - Département Poudres et Matériaux Multi-Composants
3 LPMG-EMSE - Laboratoire des Procédés en Milieux Granulaires

Heat treatments of wood are widely used for the reduction of wood swelling and dimensional instability of wood-cement composites. The effect of natural and heated wood on the hydration of cement at early ages was investigated by isothermal calorimetry, thermogravimetry (TGA) and Fourier transform infrared (FTIR) spectroscopy. The addition of wood strongly delays and inhibits the hydration of the silicate phases. Consequently, the amount of portlandite is lower in composites than in neat cement. Approximately 30% of the inhibition of portlandite precipitation is due to an increase of calcium carbonate content in cement paste. The absorption of a part of water by wood produces a decrease in gypsum consumption. Nevertheless, the ettringite formation is not significantly affected since a diffusion of sulfate ions from wood occurs.

Mots clés: Hydration; Cement; Wood; Heated wood; Retardation

Domaines: Génie des procédés

Alexandre Govin, Arnaud Peschard, René Guyonnet. Modification of cement hydration at early ages by natural and heated wood. Cement and Concrete Composites, 2006, 28 (1), pp.12-20. ⟨10.1016/j.cemconcomp.2005.09.002⟩. ⟨emse-00449702⟩