The company Aeschlimann filed a patent  EP2657302A1 about the production of a mixture of cellular glass gravel and bitumen. The patent is motivated by the following arguments:

• The layer will absorb much less humidity because the bitumen is covering the cell surface and filling the voids. In this way, we should have a much better frost resistance.
• The compressive strength, typical about 0.8 MPa for cellular glass gravel increases up to between 2MPa and 3MPa. In this way, a lot more applications for cellular glass are becoming possible.
• The patent gives a few situations where this invention can be used.

The patent describes also a plant, which is able to perform the mixing.