To impart the touch close to a natural road and strength endurable to wind and rain to a block by forming a ligneous pavement block by respectively mixing bark of a coniferous tree of a specific shape, sand, emulsion and cement at a prescribed ratio.
Among waste wood bark, bark 1 of a coniferous tree is selected, this is crushed is a fiber shape having the length of about 20 to 70 mm and a diameter of about 2.0 to 5.0 mm, and sand is mixed at a ratio of about 240 to 280 pts. to 100 pts. of the bard. 80 to 120 pts. of emulsion 40 to 80 pts. of cement are mixed to be put in a molding mold to accelerate hardening. In a ligneous pavement block formed in this way, the bark 1 of a coniferous tree rich in water retentivity and elasticity becomes a fibrous and is formed into a block by being entangled and by interposition of the emulsion, and sand mixed between bark fibers mutually joins by the cement action to enhance hardness and strength as a whole, so that water retentivity is maintained as a whole, a balance between elasticity as a pavement surface and hardness as a block body can be kept, and a manufacturing cost can also be reduced.
ISHIZUKA YUTAKA
AOYANAGI YUJI
KATO TSUKASA
