| 摘要 |
Cured cement matrices are exposed to high pressure dense-phase orsupercritic al CO2 which enters the matrix through passages therein to neutralize the natur al alkalinity of the cement so that alkali-intolerant materials can be incorporated in the cement. The CO2 converts calcium hydroxide in the cement to calcium carbonate and water, and the high pressure of the dense-phase or supercritical CO2 forms rounded, closely packed and aligned crystals with fe w or no visible pores or capillaries to enhance the homogeneity and strength o f the cured cement and its bonding with, for example, uncoated reinforcing gla ss fibers. The supercritical CO2 can be used to transport other organic or inorganic materials, including pulverized metal, in solution or suspension into the interior of the cement matrix to alter its chemical and/or physicalcharacteristics. |
