Cracks in the coating of hot-melt road markings are inevitable. Slight cracks generally do not have a significant impact on the quality of the marking line, but serious cracks will have a certain impact on the quality, durability and adhesion of the marking line.
Causes of cracks
Reflection cracks caused by roadbed cracks
Cracks caused by the expansion or contraction of subgrade materials, or cracks caused by uneven subsidence, etc., cause cracks in pavement markings. In general, it cannot be avoided only by strengthening the construction quality of the roadbed.
Cracks in soft pavement
The main reason for this is the mismatch between the coating and the hardness of the road surface. The temperature is high in summer, some places can reach 40, under the scorching sun, the high temperature of the asphalt pavement can reach more than 60, the asphalt becomes soft, and the paint is relatively hard, and soft pavement cracks may occur under the impact load of the wheels.
Cracks appear due to the aging of the reticle
The deterioration of the coating surface material and natural weathering cause cracks in the reticle. Aging cracks are also caused by periodic expansion and contraction due to the long-term exposure of marking coatings on the road surface, the change of seasons, sun and rain, and the temperature difference between day and night. Cracks caused by aging can only start with the selection of appropriate paint to prevent premature aging of the coating, and at the same time, the temperature is strictly controlled in the marking construction.
During winter construction, the coating shrinks when it is cold, resulting in internal stress, which is easy to crack when concentrated in one place
Cracks due to cold are related to the construction season and paint performance, as well as to the condition of the pavement. In particular, newly laid cement pavements have a fragile mortar layer, or curing film, which is prone to cracks.
How to prevent cracks caused by the cold, first of all, you should choose the right construction season and try to avoid construction in the cold winter. At the same time, it is necessary to pay attention to the rational use of hot melt coatings, and choose the coating formula that is suitable for it in different seasons. The newly laid cement pavement should be maintained for more than 2 weeks, and the fragile mortar layer or curing film on the pavement should be cleaned before the construction of road markings.
The hot-melt marking is not only affected by the quality of the marking coating, but more importantly, the strict control of the process and process in the marking application, both of which are indispensable.