NGA9 Alternative Reinstatement Materials (ARMs)
Alternative Reinstatement Materials, particularly slow cure Hydraulically Bound Mixtures, may not achieve their full design strength for some time after placement. It is therefore recommended that Structural Materials for Reinstatement, used as sub base or base, should achieve a minimum Immediate Bearing Index (CBR without surcharge) of 30 prior to overlaying or trafficking.
For further information on the production of ARMs from recycled and secondary materials refer to the WRAP Quality protocol for the production of aggregates from inert waste (2005 and 2004). Available at http://www.wrap.org.uk/downloads/0083-_quality_protocol_A4.67caadd5.87.pdf