Study On Material Design And Optimization Of Roadbase Of Asphalt Pavement

The cement stabilized aggregate and the lime fly ash stabilized aggregate are two typical semi-rigid base course materials. The cement stabilized aggregate has the advantages of high carrying capacity, fine anti-water damage and fine anti-freezing damage. It is well connected with the bottom layer and convenient to construct. It also has the disadvantages of shrinkage and crack. The lime fly ash stabilized aggregate has the advantages of high long strength, fine anti-water damage and fine anti-freezing damage. In this base course material, a great deal of industrial waste-fly ash is used., so it has good economic benefit. It also has some disadvantages:(Dthe construction is limited for its low early strength.CDthe layers may be bad connected for its surface slack.(3)its durability is affected by the brash capacity. So, what we need to do is to improve the anti-crack character of the cement stabilized aggregate and the early strength of lime fly ash stabilized aggregate. In this paper, based on the project of Xiangfan-Shiyan highway and a great amount of research, the crack resistance property of cement stabilized aggregate and early strength of line-stabilized aggregate are studied. As for cement stabilized aggregate, the good material, optimal grade design and progressed construction technical lead to the best crack resistance property of this material used for base. As for the lime fly ash stabilized aggregate, when affiliated with phosgypsum, the early strength and other properties about pavement are improved greatly. The results indicate that it's a economical and effective method to improve the early strength of lime stabilized aggregate by affiliated this material with phosgypsum.The research will be helpful in improving the construction technical of highway and forwarding the development of highway in our country.