Study on Properties of PPA/SBR Composite Modified Asphalt Mixture
In order to improve the anti-aging and road performance of poly-phosphate and SBR com-posite modified asphalt material,ensure the stability of highway pavement and extend its lifespan.In this paper,AC-16 graded specimens were prepared with an optimum oil to stone ratio of 5.0%.The fatigue re-sistance,low temperature cracking resistance and water stability of the composite modified asphalt mixture were measured by four-point bending fatigue test,low temperature bending test,immersion Marshall test and freeze-thaw splitting test.The test results show that the fatigue resistance and water stability of the as-phalt mixture are significantly improved after the addition of PPA and SBR modified asphalt material,but the high content of PPA is unfavorable to the low temperature performance of the mixture.Combined with the engineering practice,it is finally determined that the performance of the composite modified asphalt mixture is best prepared according to 3.0%SBR+1.0%PPA.
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