| 摘要 |
A flexible, porous and durable tree well skirt and a sidewalk structure are made of a cushion base of butadiene rubber and a wear layer of ethylene propylene diene monomer (EPDM). The butadiene rubber is mixed with an isocyanate polyurethane binder and spread on the ground around the tree to form the cushion base of the tree well skirt. The EPDM is mixed with an isocyanate polyurethane binder and spread over the cushion base to form the wear layer. The cushion base and wear layer structure used for a sidewalk is spread over a stabilized porous base.
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