Use of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Asphalt Mixtures (2016) / Chapter Skim
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Pages 65-74
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66 • No excess supply of RAS (four agencies)
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67 TABLE 63 AVAILABILITY OF RAP AND RAS THROUGHOUT STATE Survey Question: Supply and Demand: Also, indicate if there is any excess of recycled materials (i.e., more supply than demand)
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68 Weather conditions and the time between processing and using the RAP may influence RAP processing; however, 53% of the responding agencies do not have any time requirements in their state. Additional respondent comments about the influence of weather on RAP processing included: • Typically, contractors will not process RAP during bad weather.
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69 TABLE 67 MAXIMUM PARTICLE SIZE ALLOWED FOR RAS Survey Question: Select the maximum shingle (RAS) particle size allowed.
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70 the processing and storage costs for RAS prohibit their use in rural areas." Recycled Material Processing and Stockpiling -- Section Summary RAP processing and stockpiling • RAP is fractionated for better control of mix design volumetrics when using higher percentages. – The sieve size used to fractionate coarse and fine sizes is usually the 4.75-mm (No.
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71 gradations. Only a limited number of agencies determine flat and elongated coarse aggregate and fine aggregate angularity shape for either the individual RAP or total asphalt content mixture.
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72 for producing mixtures with more than 25% RAP. Plant production rates are to be slowed and temperatures raised when producing mixtures with more than 25% RAP and mixtures with a combination of RAP and RAS.
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73 • Less fluid and moves in a stiff, harsh mass that is very temperature sensitive. • Stiff and crusty.
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74 Survey Question: When placing asphalt mixtures with a combination of RAP and shingles (RAS) , how frequently each of the following is observed.
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75 mixtures. The comments received for this question are separated into those generally related to all recycled materials, specifically for RAP, and specifically for RAS.
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