As the traffic flow increases, especially the increase of heavy vehicles, often Fulu S232 - Xin'an bridge section of the road has a large area of subsidence and cracking, rutting, ponds and other diseases, which is the main problem of rut. The appearance of rutting makes the pavement deformation, destroy the smoothness of the road surface, weaken the overall strength of the surface and pavement structure, and thus affect the safety of the road. At present, in order to improve the service level of the road traffic, improve environment, the urgent need for road maintenance of Fulu.

This construction is often Fulu was east-west, the starting point is located in S232, located in the west end point Cao port bridge bridge, the route length of 8719m. In view of the emergence of a large area of the rut on the road (especially Jiangnan Road, Chaoyang Road intersection, the traffic lights, parking brake position, the rutting problem especially the road maintenance construction), the new technology of SFC-20 semi flexible concrete base and asphalt surface layer by SMA-13.

The construction technology of the semi flexible concrete road construction by SFC-20, is a research with each other, play their respective advantages, the formation of a powerful force of a practice: SFC-20 semi flexible concrete based on absorbing advanced design abroad and construction technology, combined with the latest research results of laboratory test and engineering practice project in the Province and outside. Full technical guidance, Southeast University Technology Service Center, by Changzhou municipal construction workers to complete construction.

The key process of SFC-20 semi flexible concrete construction is the construction of cement mortar. The first is the production of cement mortar, adding raw materials in strict accordance with the various materials to determine the proportion of indoor test and on-site construction, using cement mortar mixer field mixing for 3 minutes, the discharge requires mixing evenly, or need to extend the field mixing time; secondly, the cement slurry filling, must use the mud pump into the asphalt, not the machine directly into the loading, as much as possible so that the internal air fully discharged, fully guarantee the cement slurry enters the gap, make full, dense and pore free; then, timely use of a slower speed plate compactor vibration, repeatedly, the cement slurry filled the void, until the surface is void; finally, to two of the cement mortar surface cleaning, time points are in filling after the completion of the 10 minutes and 1 hours, the construction site is also considered cement mortar Adjust the molding conditions. Cleaning paste should be exposed to asphalt concrete is appropriate, ensure the following layer asphalt concrete has good structural depth, not only that, in the cement mortar before the initial setting but also in the more local time of artificial hole grouting, ensure the slurry density. After the completion of grouting, at room temperature, no special maintenance, maintenance time of not less than 48 hours.

In practice the research, through the guidance of Southeast University doctoral technical service center, we can do the preparatory work before construction, in the construction process, the project department, technical service center and owners alike, but also for the people of Changzhou, travel to provide a comfortable traffic environment.