To provide a concrete product which reflects light more efficiently and which is visibly better recognized.
Glass cullet 3 obtained by crushing air-cooled reinforced glass of a car has planar parts 3a, 3b and a crushed surface 3c. This cullet 3 is mixed in surface layer concrete 2a of a concrete block 1 as aggregate and the parts 3a, 3b are exposed on the surface of the block 1 so that the brightness of reflected light can further be enhanced by uniformly reflecting incident light efficiently from the whole of the parts 3a, 3b.
TOYOTA MOTOR CORP
DAISEN SANGYO KK