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Structural Soil
Structural Soil is a medium that can be compacted to pavement design and installation requirements while permitting root growth. It is a mixture of gap-graded gravels (made of crushed stone), clay loam, and a hydrogel stabilizing agent to keep the mixture from separating. It provides an integrated, root penetrable, high strength pavement system that shifts design away from individual tree pits.〔Bassuk, Nina, Jason Grabosky, Peter Trowbridge, and James Urban. "Structural Soil." Urban Horticulture Institute. Cornell University, 1996. Web. 26 Apr 2010. .〕
==Problems with Typical Installations==
Previously the main problem facing the establishment of trees in paved areas is the lack of enough volume of soil for tree root growth. Soils under pavements are typically so compacted that it stops roots from growing. Older established trees with their roots under pavement grow poorly and often die. They can also cause pavement failure and displacement. Overall pavement preparation and repairs can shorten the life expectancy of a tree to 7–10 years where we could see them grow for at least 50 more years.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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