On the left, the comparison of the mass intake of the composite absorbing water (at 82 °C) when filled with cement with different particle sizes. On the right, the cumulative heat evolution during the hydration of cement with different particle sizes, in water at 82 °C, both in HNBR and
standing alone. The finer particle size causes a faster hydration. When the cement is embedded in the rubber, the hydration kinetics is strongly affected by the water diffusion in the rubber matrix.