Recycled Asphalt Pavement Specification

The united states federal highway association fha notes these underlying materials are created when asphalt pavements are removed for various activities including.

Recycled asphalt pavement specification.

The engineering design of. Soil stabilization may consist of recycled products meeting general stabilizer requirements concrete rubble portland cement. However the mix plant the degree of mixing and the transfer of heat from the new aggregate to the reclaimed material are functions of. Embankment broken portland cement concrete and concrete rubble reduced to specification size reclaimed asphalt pavement project specific as blended or alternating layers.

Fractionated rap is crushed and sized reclaimed asphalt pavement that has been separated into its constituent aggregate sizes. These faqs are categorized into subject areas listed in the contents dropdown box below. Previous laboratory testing research reports were compared. What is recycled asphalt.

1986 napa established the national center for asphalt technology ncat at auburn university alabama providing. There are also two types of rubberized ogfc mixes. 1993 special specification 3157. Using rap material has well recognized financial and environmental benefits.

Developing specifications for using recycled asphalt pavement as base subbase or general fill materials phase ii is a complete comprehensive report 11. Rubberized hot mix asphalt open graded rhma o and rhma o high binder rhma o hb. Asphalt pavement has been america s most recycled material for a long time. Today asphalt pavement is america s most recycled material with more than 70 million metric tons of asphalt paving material is recycled each year.

Txdot promotes using rap in many pavement management strategies. Cold processed recycled paving material for use as aggregate base course statewide use. Amount of recycled asphalt has been incorporated in mixes. Crushed concrete or other non hazardous recycled materials processed recycled asphalt pavements bottom ash foundry slag glass and recycled crumb rubber fly ash.

For example the hot mix asphalt specification encourages the use of fractionated rap while discouraging the use of unfractionated rap. Recycled asphalt or reclaimed asphalt pavement rap is reprocessed pavement containing asphalt and aggregates. If reclaimed asphalt pavement is incorporated into the mix it is usually mixed in the laboratory until thoroughly heated and blended with the new aggregate. Speight phd dsc in asphalt materials science and technology 2016.

3 although most of the produced rap is recycled a large portion of it is wasted or down graded when used in landfills embankment or base layers.