Industry Reports
| Report No. | IP61(jot this number down to order) |
| Title | Use of Crumb Rubber in Slurry & Microsurfacing |
| Author(s) | Holleran, G. & Reed, J.R., Valley Slurry Seal Co. |
| Publisher | Valley Slurry Seal Co. |
| Pub. Date | |
| Pages | 11 pages |
| Keywords | |
| Description | The problem of disposal of tyre rubber is well known. Many methods of disposal have been used including burning, burying, and recycling to other rubber products. In some countries tyre rubber has been used in road applications to enhance performance or merely use the road as a horizontal landfill. The increase in popularity of emulsions in many countries for environmental and energy reasons has meant that the traditional hot applied methods using rubber have become an increasingly unattractive final destination for tyre rubber and emulsion alternatives are required. The application of crumb rubber in emulsions has been somewhat limited, this is not because rubber cannot be emulsified but because the other components in crumb rubber and the crosslinked nature of the product have meant that even the best wet process blends are distinctly two phase. The solution has been to add the rubber into dry aggregate mixes with emulsion or create dispersion in a suitable diluent. One such process is the subject of this paper. In this paper the properties and manufacturing methods of such emulsions are discussed. The properties of the emulsion are discussed in terms of stability and general properties, the application and performance are discussed in the areas of slurry and microsurfacing. Laboratory mix design methods indicate that the use of crumb rubber can reduce deformation in slurry and microsurfacing, increase allowable asphalt content without bleeding, increase flexibility and abrasion resistance. The combination with latex additives appears to give even greater improvements and this system needs to be examined more closely. Adhesion too is improved and this may be partly attributable to the oil fraction used in the product manufacture. This was checked using different solvents and it was found that solvent has a significant effect. This would be attributed to enhanced wetting. |
| Postage | $ 2.00 : U.S. $ 2.20 : Canada/Mexico $ 2.40 : Rest of the World |
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