Patent ID: 6960046
Filing Date: 2005-11-01
Classification: E01C,Y02A

Abstract:
1. Permeable and elastic pavement blocks comprising a permeable concrete layer consisting of aggregates of the size in the range of 5–13 mm, cement, water and admixture products; a primer layer; and an elastic layer from the bottom to the top, wherein the permeable concrete layer has the compressive strength of 100 kg/cm the primer layer comprises 10–20% by weight of PPG, 5–10% by weight of trimethylol propane, 5–10% by weight of 1,3-butylene glycol, 15–25% by weight of toluene diisocyanate, 49–64.9% by weight of a solvent, and 0.1–1.0% by weight of an additive; and the elastic layer comprises waste-polyurethane chips and a binder in the weight ratio of 3:1 to 5:1, the waste-polyurethane chips having the size of 1 to 5 mm and the binder comprising 50–70% by weight of polypropylene glycol, 5–10% by weight of polybutadiene glycol, 3–5% by weight of 1,3-butylene glycol, 20–30% by weight of methylene diisocyanate and 2–5% by weight of toluene diisocyanate.