Abstract
Low-porosity portland cement pastes were prepared by pre-hydration compression at 5, 10, 30 and 70 atmospheres, followed by hydration in liquid water at 25°C for about two years. The thickness of the produced tobermorite sheets was found to depend on the pressure used in the pre-hydration compression. It seems that at the highest compression there is not enough room for complete hydration nor for sheet thickening. The simultaneous changes in the degree of hydration, the pore structure, and the specific surface area of the main hydration product due to pre-hydration compression, could affect the compressive strength measured for the various pastes, and an interpretation is given.
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