Study On The Effect Of Temperature And Adding RAP On The Deformation Characteristics Of Unbound Granular Materials

Unbound granular material is composed of coarse,medium and small aggregate and stone chips,The strength and stiffness is mainly dependent on the aggregate between block extrusion and friction,well designed unbound granular material which can form high strength and stiffness,Although the road workers have done a lot of research on unbound granular material,but not enough,and most of the studies have not considered the effect of temperature on the performance of unbound granular material.While the asphalt pavement is the main road type of the highway in our country,and the large-scale construction is basically completed,with the increase of the maintenance and alteration mileage,a large amount of reclaimed asphalt pavement(RAP)is produced every year.It is difficult to absorb the RAP by Recycled Asphalt Mixture.Some scholars at home and abroad have discussed the application of RAP in unbound Aggregate Base,and made some research results.However,due to the difference in the properties of the RAP material(gradation,asphalt content,material source,etc.),the effect of RAP on the performance of the unbound granular material needs to be explored in depth.The paper conducts the system research on the effect of temperature and RAP on the deformation characteristics of unbound granular material.In order to study the effect of temperature and addition of RAP on the deformation properties of unbound granular material,this paper designed 3 kinds of gradation type(Coarse graded ?Continuous graded ?Gap graded),as contrast,three kinds of adding RAP unbound granular material were designed(it should ensure that the pass rate of each sieve remains unchanged).The author use UTM-100 at different temperatures(5 ?,22 ?,40 ?)to put to permanent deformation test of repeated loading 10000 times.Based on the analysis of the test results,the basic deformation law distribution under the repeated load is obtained at room temperature,the coupling effect of temperature and the addition of RAP and two has a significant effect on the deformation characteristics of unbound granular material,and also has a great relationship with gradation...