Recycled Asphalt Pavement Specification

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.

Recycled asphalt pavement specification.

Today asphalt pavement is america s most recycled material with more than 70 million metric tons of asphalt paving material is recycled each year. 1993 special specification 3157. Previous laboratory testing research reports were compared. Asphalt pavement thickness and mix design while there are an infinite number of questions that can be asked we compiled a list of those questions that have been directed to us the most.

There are also two types of rubberized ogfc mixes. The engineering design of. Speight phd dsc in asphalt materials science and technology 2016. Rubberized hot mix asphalt open graded rhma o and rhma o high binder rhma o hb.

These faqs are categorized into subject areas listed in the contents dropdown box below. What is recycled asphalt. Txdot promotes using rap in many pavement management strategies. Asphalt pavement has been america s most recycled material for a long time.

Embankment broken portland cement concrete and concrete rubble reduced to specification size reclaimed asphalt pavement project specific as blended or alternating layers. Amount of recycled asphalt has been incorporated in mixes. Soil stabilization may consist of recycled products meeting general stabilizer requirements concrete rubble portland cement. Common types of flexible pavement include hot mix asphalt hma rubberized hot mix asphalt gap graded rhma g and open graded friction course ogfc.

Fractionated rap is crushed and sized reclaimed asphalt pavement that has been separated into its constituent aggregate sizes. For example the hot mix asphalt specification encourages the use of fractionated rap while discouraging the use of unfractionated rap. Developing specifications for using recycled asphalt pavement as base subbase or general fill materials phase ii is a complete comprehensive report 11. Florida uses a stiffness strength value of limerock bearing ratio lbr that is similar to a california bearing ratio.

The united states federal highway association fha notes these underlying materials are created when asphalt pavements are removed for various activities including. Recycled asphalt or reclaimed asphalt pavement rap is reprocessed pavement containing asphalt and aggregates. Crushed concrete or other non hazardous recycled materials processed recycled asphalt pavements bottom ash foundry slag glass and recycled crumb rubber fly ash. 1986 napa established the national center for asphalt technology ncat at auburn university alabama providing.

However the mix plant the degree of mixing and the transfer of heat from the new aggregate to the reclaimed material are functions of.