This specification covers processed glass cullet intended for use as a granular road base material. When properly processed and mixed with natural or crushed aggregate, hauled to and properly spread and compacted on a prepared grade to appropriate density standards, glass cullet can be expected to provide adequate stability and load support for use as road or highway bases. Material described in this specification is not intended to be used in treated or stabilized pavement layers. This specification is intended for use in conjunction with AASHTO M 147 or with the requirements of the local jurisdiction specifying the properties of natural or crushed aggregate used in the base course. It is not intended for use in base courses in locations where surfacing will not be placed over the base.

Note—The engineer is advised to provide appropriate construction specifications to ensure that sufficient compaction is achieved so that further densification of the completed pavement from traffic loadings will be insignificant. The method requires compaction of the material at a suitable moisture content on a firm foundation of a short control strip by means of vibratory or other proven effective rollers or tampers, until no further increase in density results. Compaction requirements should ensure that the average density of the final base course is an appropriate percentage of the maximum density obtained for the control strip; for base courses, achieving on average 98 percent of the maximum control strip density is suggested.