As an essential preliminary to understand the hydration of wood-cement comp
osites, the effects of some additives on the delayed setting due to wood of
an Ordinary Portland Cement have been investigated by isothermal calorimet
ry. With the addition of calcium chloride and activated charcoal, an increa
se of 50 % of the total enthalpy is observed in wood-cement composites hydr
ation, because calcium chloride mostly influences aluminate phases and acti
vated charcoal silicate phases.