Asphalt recycled

The soil cleanup system (SCS) is a rotary kiln modified asphalt recycling unit for treatment of gasoline- and diesel-fuel-contaminated soils. This technology has been used in at least two full-scale demonstrations however, its commercial availability is unknown because RIMS was unable to contact the vendor. The asphalt recycling unit was originally developed by Robert L. Mendenhall, a Las Vegas, Nevada, contractor who had successfully recycled asphalt for a number of years. 

Additionally, the effect of asphalt recycling is positive, particularly when cold recycling is used on carbon emissions. It has been found that carbon emissions were only 624 kg eq C/1000 m during the reconstruction of a 7 cm thick asphalt layer using cold recycling, in contrast to 2381 kg eq C/1000 m by way of the conventional technique with hot bituminous mixture (Mauduit et al. 2011). 

Figure 18.12 Comprehensive mix design flow chart of hot in situ recycled (HIR) asphalt mixture. (From ARRA, Basic Asphalt Recycling Manual. Asphalt Recycling Reclaiming Association. Annapolis, MD ARRA. 2001.)...

ARRA. 2001. Basic Asphalt Recycling Manual. Asphalt Recycling Reclaiming Association. Annapolis, MD ARRA. 

Eaton E. 1991. States fine tune asphalt recycling specs. Asphalt recycling and reclaiming 91. Roads Bridges, Vol. 29, No. 10, pp. 26-29. Des Planes, IL Scranton Gillette Communications. 

Mollenhauer K. and L. Caspar. 2012. Synthesis of European knowledge on asphalt recycling Options, best practices and research needs. Proceedings of the Sth Eurasphalt Eurobitume Congress. Istanbul, Turkey. 

Jennings has also done some work with asphalt recycling. In this process old road material in bad condition is stripped from the roadway, mixed with a softening agent, and relaid. Sufficient new material is generally added to restore viscosity and ductility to levels approximating those of new asphalt. This does... 

Recycled rubber is still used as tire derived fuel, but less so than 10 years ago. Another outlet is as an additive to asphalt. Recycled rubber can be used in the plastics industry, for which much development is being done. Large particle size ground rubber or chips are used in civil engineering applications, landscaping, or artificial turf. 

Mixed recycled plastics from computers and other electronics equipment are being used by Conigliaro Industries, of New England, in an asphalt road-paving mix. The company also developed a system for recycling the plastic equipment housings from computer and electronic products and a unique cold patch asphalt/recycled plastic mix for filling potholes. ... 

If a plant cmshes to obtain stone of 0.6 and 7.6 cm for lime-kiln feed, coarse aggregate, or fluxstone, much undersized material is also produced. Oversized material can be reduced by recycling through the cmsher system, but the subsized stone, called spall, is wasted in a spall pile. Such spalls have potential value as by-products for use as, eg, asphalt (qv) filler. 

P r ho. The Paraho retorting technology is similar to the PETROSIX technology except that it can be operated in the direct heat (DH) mode. The unique feature of the Paraho technology is the two levels of heat input (Fig. 4). In the IH mode, the air blower shown in Figure 4 is replaced by a recycle gas heater. The Paraho DH operation has been carried out neat Rifle, Colorado since the 1970s operations to produce asphalt (qv) from shale oil are continuing. 

Rubber recycling has been extended to the use of mbber in asphalt (qv), scrap mbber as fuel, mbber pyrolysis, tine spHtting, and other uses. 

The United States generates ca 250 x 10 scrap tines per year. In 1977, ca 52 t of reclaimed mbber and 14,400 t of cmmb mbber were produced from these tires (40). In 1980, ca 4050 t of reclaimed and cmmb mbber were used in asphalt—mbber compounds, which is less than 5% of the recycled mbber. Except for a reduction in reclaimed mbber, the 1986 production rates were higher an estimated 25,200 t of mbber were used in asphalt. 

Many existing roads fail because the asphalt becomes stiff and brittle. If the materials are too stiff, additives that lower the viscosity must be used. The feasibihty of usiag sulfur to soften or reduce the viscosity of the oxidized biader ia recycled pavements has been successfully demonstrated by the U.S. Bureau of Mines and others (55—57). 

Copolymer technology is progressing along two "fronts." First, new appHcations for copolymers are being found to increase the volume of materials that are already commercially available. One example of this is the rapid growth of styrenic block copolymers sold as asphalt (qv) and polymer modifiers over the past 10 years (Fig. 7). Another is the increased interest in graft and block copolymers as compatihilizers for polymer blends and alloys. Of particular interest are compatihilizers for recycled polymer scrap. 

On the other hand, liquid propane also has a high affinity for paraffinic hydrocarbons. Propane deasphalting removes asphaltic materials from heavy lube oil base stocks. These materials reduce the viscosity index of lube oils. In this process, liquid propane dissolves mainly paraffinic hydrocarbons and leaves out asphaltic materials. Higher extraction temperatures favor better separation of the asphaltic components. Deasphalted oil is stripped to recover propane, which is recycled. 

Takkalou, H.B. and Takkalou, M.B., Recycling tires in mbber asphalt paving yields cost, disposal benefits, Elastomerics, 123, 19, 1991. 

Used oil distillation bottoms. When used oil is recycled, residues (called distillation bottoms) form at the bottom of the recycling unit. To promote the recycling of used oil and the beneficial reuse of waste materials, U.S. EPA excluded these residues from the definition of hazardous waste when the bottoms are used as ingredients in asphalt paving and roofing materials. 

Commercial alloys, 73 525-530 Commercial asphalt materials, recycling, 23 592... 

Rubber reclaiming, 27 473 476, 784—785. See also Rubber recycling oils and processing aids for, 27 472t Rubber recycling, 27 461—480, 784—785. See also Rubber reclaiming asphalt modification, 27 467—469 civil engineering market for,... 

The sites are two utility maintenance yards that lie adjacent to one another. In both cases the former USTs were excavated and removed, and the hydrocarbon-affected soil surrounding the former USTs was excavated and reused/recycled via incorporation as an ingredient in the production of cold-mix asphalt. 

T0276 Environmental Recycling, L.L.C., Asphalt Stabilized Base/Engineered Backfill T0277 Environmental Remediation Consultants, Inc., Biointegration... 

The characteristics of a soil determines the cost-effectiveness of the recycled product. Sandy, silty, and cobble soils are more suitable for recycling into asphalt concrete. 

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