一、Drawbacks of normal pavement pothole
（1）Normal hot-mix equipment can not produce small quantities of finished materials, from the hot asphalt to finished products should be at least 3-5 days, moreover, from the mixing plant to the construction site of finished material, increasing the cost of the mix to repeat heating and warmed cost. Since the road has characteristics of a long line multi-point, and pavement slots are showing the dispersion characteristics of the distribution, conventional hot-mix equipment is suitable for larger quantities and concentrated projects.
（2）Emulsified asphalt can live mixed, but not supply at any time and high cost.
（3）Cold mix asphalt is the mixed material adding by 20% of kerosene and others, bagged and sealed storage, patcher use under low temperatures , high cost.
二、working principle of sealant pouring
In the high-temperature environment of 193 ℃, sealant was liquid status, liquid sealant and asphalt road will be an effective combination, play a role in the permeability. When the temperature decreases, the liquid sealant will appear a high-adhesion and superior resilient action.At this time, there will be cracks because of thermal expansion, even the elastic deformation occurs. In such cases, the liquid sealant will sealing the crack in a sealed state.
As science and technology continue to change and develop, cracks appears during road construction increasingly serious. The construction technology of sealant must be modified for further optimization, in order to meet the needs of road construction, to ensure the safety of traffic, also ensure the aesthetics of the road surface and durability. The construction process of sealant pouring is exist under this background.
