Here are some links to federal standards and guidelines for using recycled glass. The Federal Highway Administration Research and Technology Coordinating, Developing, and Delivering Highway Transportation Innovations is a document that is much shorter than it sounds. About 2 pages long, it discusses applicability of glass in roadways.
This other link takes you to the Environmental Protection Agency's Comprehensive Procurement Guidelines (CPG) for Miscellaneous Products webpage. Here it has a variety of materials, Blasting Grit being one that can use 100% recycled glass in line with appropriate sieve size and cleanliness standards.