Plastic spacers that allow a curved wall to be built with 80 mm thick blocks. Placed between one block and another, they create evenly spaced joints, keeping the framework aligned and reinforcement rods away from the glass blocks and central to the joint.
Spacers give a 10 mm internal joint and up to 40 mm external joint.
Minimum internal radius acheivable with 190 x 80 x 190 mm glass blocks would be 770 mm, a full circle would use 24 blocks.
Minimum internal radius acheivable with 90 x 80 x 190 mm glass blocks would be 383 mm, a full circle would use 24 blocks.