Abstract
The capillary pore structure of hardened portland cement pastes cured by high‐pressure steam, chemical acceleration, high‐pressure steam with reactive SiO2, water immersion, water immersion and high‐pressure steam, and hot‐pressing was measured using mercury porosimetry to 50,000 psi. Differences of > 2 orders of magnitude exist in the average capillary pore diameters of the cement pastes studied. The largest pores (∼1 to 3 μm in diameter) are associated with high‐pressure steam‐cured pastes. The smallest average capillaries observed were 0.02 μm for pastes steam‐cured with reactive SiO2. Hot‐pressed pastes had essentially no porosity accessible to mercury. The application of pore size control to problems of polymer‐impregnated concrete is discussed.
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