Research Of Bituminous Concrete Pavement Water Stability

The water damage of bituminous concrete pavement has been one of the uppermost disease on expressway. A large number of research materials indicate that primary factor causing the road surface to be damaged is water entering in road surface structure. Water damages reduce badly service life on road surface, raise the maintain cost, and bring enormous losses to national economy.This subject mainly probes into many kinds of factors influencing pitch mixture water stability from the own performance of pitch, micro mechanism analysis, pitch mixture characteristic, road water stability mechanism and several respects. The main research approach is to compare several kinds of existing drainage pitch mixture gradation, through adjusting fine aggregate and coarse aggregate proportion, especially 2.36mm and 1.18mm, from the results of tests, point out optimum gradation of good water stability, and find the interrelation of bituminous mixture perviousness and void ratio. The main content includes: analyze characteristic of water damage and influence to road; compare every index and determine method to bituminous mixture. Point out flet mechanism of aggregate and pitch from two respects of physics and chemical performance, probe into internal cause and external cause on road surface further. It confirms gradation and asphalt-aggregate ratio by test. Compare several normal modify pharmaceutic, give the content of cement replaces some part of mineral powder. Focal point to choose an optimum gradation can improve bituminous mixture water stability, and improve drainage design.It can improve the bituminous mixture water steadily through researching and guarantee road surface good resisting rut and resisting slip at the same time. Accommodate it to expressway serious traffic of volume of traffic characteristic and environmental characteristic, thus satisfy the road surface security and usability, lengthen road surface service life; improve the road surface quality of our country effectively, reduce the maintenance cost of the road from long-term respect, improve the service level of the road.