Design and Verification of SMA-13 Mix Proportion for Plant Mix Hot Recycling of RAP Fine Separation Materials with Different Dosages
In order to verify the feasibility of applying high content bituminous mixture(RAP)fine separation material to the upper layer of roads,a layered milling method was adopted.The original SMA-13 pavement milling mate-rial was stored separately,and the second generation fine separation equipment was used to divide the RAP fine separation material into grade aggregates that meet the engineering needs.The 30%,40%,and 50%RAP fine separation material plant mixed hot recycled SMA-13 bituminous mixturemix design was carried out through rutting tests,two-point small beam bending tests the freeze-thaw splitting test and immersion Mar-shall test have tested its high-temperature stability,low-temperature cracking resistance,and water stability.The results showed that the optimal comprehensive oil stone ratio of recycled asphalt mixtures with different RAP dosages remained unchanged,as the RAP content increases,the required amount of new asphalt gradu-ally decreases,the stability and low-temperature crack resistance of the mixture gradually decrease,and the flow value,Kentucky scattering loss,and high-temperature stability gradually increase,the road perfor-mance of regenerated SMA-13 bituminous mixture with a 50%RAP fine aggregate content meets the require-ments of the specifications.
road engineeringRAP fine separationplant mixed hot regenerationbituminous mixture
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