| 摘要 |
The invention relates to a barrier cap material including a blend of: a plurality of aggregate particles, and a plurality of manufactured composite particles including a hydratable sealant material. In a particular embodiment, the segregation of a blend of aggregate particles and composite particles, when dropped through a water column can be controlled by varying blends of aggregate and composite particles. In another embodiment, the permeability of the barrier cap material, when hydrated on a surface, can be controlled from 1x10<SUP>-3 </SUP>cm/sec to 1x10<SUP>-8 </SUP>cm/sec by varying blends of aggregate and composite particles.
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