Research on the application of direct injection modifiers in in-situ thermal regeneration of ordinary asphalt pavementqiran
In order to investigate the application effects of direct injection modifiers on the in-situ thermal regeneration of ordinary asphalt pavement,the road performances of direct injection modified in-situ thermal recycled asphalt mixture was evaluated by means of immersion Marshall test,freeze-thaw splitting test,rutting test and uniaxial penetration test.The results show that the dynamic stability of the direct injection modified in-situ thermal recycled asphalt mixture reaches 10,994 times/mm,with a freeze-thaw splitting strength ratio of 88.2%,residual stability of 96.8%,and uniaxial penetration strength of 2.436MPa.The construction process of in-situ thermal regeneration pavement under the condition of 150℃mixing for 45s ensures uniform mixing of the direct injection modified in-situ thermal regeneration asphalt mixture.And the regenerated pavement meets the required specifications for the compaction,water seepage coefficient,structural depth and pendulum friction coefficient.Under tracking and observation,the modified in-situ thermal recycled pavement maintains good road performance after one year operation.
recycled asphalt mixturein-situ thermal recyclingroad performancedirect injection modificationconstruction process
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