Standardized Construction Builds Reliable Pavement Markings: Key Points of Thermoplastic Road Marking Methods

Road traffic markings are important safety-guidance facilities on pavements. Owing to their fast forming, high wear resistance and outstanding cost-effectiveness, thermoplastic markings are widely used on various pavement scenarios such as urban roads, expressways and industrial parks. The final retroreflective performance and service life of a marking depend not only on the quality of the coating itself but also, decisively, on a standardized construction process.

Thermoplastic marking construction is a hot-spray operation, and the whole sequence of procedures is closely interlinked—every step directly affects the forming quality of the marking. Preparation before construction is especially critical. First, on-site traffic control must be set up, warning and protective facilities placed, and passing vehicles and pedestrians directed to ensure the safety of workers. Then pavement cleaning is carried out, thoroughly removing dust, grit, oil stains and standing water; the pavement must be kept dry and clean so that the coating adheres firmly to the surface and later peeling or flaking is avoided.

Layout and lining are done according to the design drawings, using surveying tools to locate marking positions so that the marking lines are straight and the dimensions meet national-standard requirements. Next comes coating melting: the thermoplastic coating is fed into a melter, heated and stirred evenly, and the melting temperature is strictly controlled. If the temperature is too low, the coating has poor fluidity and the marking thickness is uneven; if it is too high, the coating easily ages and deteriorates, shortening the marking service life. Once the coating is fully melted and evenly stirred, it is poured into the line-marking machine hopper.

During formal line-marking construction, operators push the marking machine forward at a constant speed, screeding the molten coating onto the pavement while simultaneously dropping glass beads. Glass beads are the core that enables the night retroreflectivity of thermoplastic markings, and the timing of their spreading is crucial: they must be scattered synchronously before the coating cools and solidifies so that they are firmly embedded in the surface layer of the marking, thereby ensuring the retroreflective effect under vehicle headlights at night.

After construction is completed, the cooling and curing stage begins. Thermoplastic coating forms by cooling down; during natural cooling, vehicles and pedestrians are strictly prohibited from rolling over or stepping on it. Only after the marking has fully cooled and hardened are the protective barriers removed, the traffic control lifted and normal road traffic restored.

There are also many details to control during construction: hot-spray construction is unsuitable in rainy or humid weather; a pavement temperature that is too low reduces bonding strength; the construction travel speed must remain stable to control the marking thickness; and the amount of glass beads dropped must be moderate—too many tend to detach, too few cause insufficient night retroreflectivity.

What looks like simple line-marking rests on a rigorous and complete construction process. Only by strictly controlling every construction procedure can thermoplastic road markings with neat lines, firm adhesion and excellent retroreflective performance be produced, enabling them to long serve the functions of lane separation, direction guidance and safety warning, and to safeguard road traffic travel safety.