Crack problem of road marking

On the highway construction, road marking, we often encounter the some kind of problems. I have accumulated some experienceam through learning and practice in the long-term highway construction, the following are several common problems and solutions on the hot-melt marking construction i will share with you.

1. Winter construction, painting case of cold-shrink, resulting in stress, this stress concentration at one point, easy to crack; the emergence of cracks due to the cold season and paintings and construction related to the performance, but also related to the situation with the road surface. In particular, the new paved road with fragile cement mortar layer, or conservation of film, easy to crack. How to prevent cracks due to cold, we should first select the appropriate construction season, try to avoid the cold winter marking construction. At the same time pay attention to the rational use of hot-melt painting, different seasons and their corresponding paint selection ratio. Newly laid cement road surface, curing time should be 2 weeks or more, the road on the conservation of fragile plaster layer or film, road marking should be cleaned up before construction.

2. Subgrade reflection cracks
Roadbed material generated by expansion or contraction cracks, or cracks due to uneven subsidence caused road markings such as cracks. Under normal circumstances can not be avoided, can enhance the quality of roadbed construction.

3. Road softened produced cracks in some places in summer temperature of 40 ℃ or above, high-temperature asphalt pavement under the hot sun can reach 60 ℃ or above, asphalt softened, while the painting is relatively hard, at the wheel impact load that may arise under the soft-road crack. Produce soft pavement cracks is the direct cause of the soft and hard surface paintings and the extent does not match the shock loads generated, should be an appropriate adjustment formula can ease.

4. painting is a painting of surface crack after construction, the surface irregular mesh cracks, this crack depth shallow, but often a basis for further development as the aging of cracking, so that painting damage. To prevent painting the surface of dry, we should start a good selection of compatible resins and additives to start, pay attention to the temperature control of the construction.