Crack Repair Technology Evolves Towards Rapid and Non-Destructive Crack Repair
"Fill every crack" has become the maintenance strategy of most provinces. Crack repair technology has evolved from traditional crack filling with modified asphalt and modified emulsified asphalt to the current use of specialized crack filling adhesives for grooving and grouting. Maintenance materials, equipment, and techniques have all seen significant advancements. With increasing traffic volume, the pressure from maintenance and repair operations is also increasing. Therefore, a rapid and non-destructive crack repair technology (tacking) is gradually gaining popularity in China. This technology eliminates the need for grooving and directly applies the crack adhesive to the pavement crack. It offers high efficiency, minimal impact on the traffic environment, and prevents secondary damage, making it a promising application prospect.

Fog Seal Technology Evolves Toward Multifunctionality
Early fog seals primarily used emulsified asphalt. With the development of fog seal technology, reducing agent seals (rejuvenating agent seals) and sand-containing fog seals have emerged. Reducing agent seals (rejuvenating agent seals) use asphalt reducing agents to partially restore the properties of old asphalt, thus restoring the asphalt. Sand-containing fog seals incorporate fillers such as clay and china clay into the original fog seal material, improving the fog seal's anti-skid and wear resistance. Fog seal technology is evolving from its initial sole function of sealing water to encompass multiple functions, such as restoring asphalt properties and improving pavement anti-skid performance.
Microsurfacing technology is evolving towards low-noise technology.
The primary drawback of microsurfacing is its high noise levels, which impact driving comfort. To address this, low-noise microsurfacing technology has been developed domestically. In 2013, the Beijing Municipal Highway Administration used low-noise microsurfacing to conduct preventive maintenance on six roads, covering a total area of ??366,000 square meters. On-site noise testing was conducted after the roads opened to traffic. The test results showed that the noise level after microsurfacing was significantly reduced compared to before the installation. Driving noise levels were still higher than those on other roads, based on driving experience and on-site observations, but were still acceptable.
Chip seals are being promoted on ordinary roads.
Chip seals are applied layer by layer, offering low cost, simple equipment, and a simple construction process, resulting in a fast installation. Chip seal technology has long been widely used in Europe and the United States due to its high cost-effectiveness. Chip seal technology is also highly suitable for my country's conditions. Of my country's over 4 million kilometers of highways, 104,000 kilometers are expressways, nearly 420,000 kilometers are first- and second-class highways, and the vast majority are third- and fourth-class highways. Besides expressways, chip seal technology is also suitable for preventive maintenance, construction, and reconstruction projects on other highways.
Overlay Technology Evolves Toward Thinner Overlays
Traditional overlays are over 4 cm thick. Thin-layer overlays are thinner than traditional overlays. Thin and ultra-thin overlays are typically not used as a pavement structural layer, but rather as a wearing layer. As long as the surface function meets the required requirements, thinner thicknesses clearly provide better economics. Currently, technological advancements are driving the application of new materials, equipment, and technologies in overlay projects, driving overlay technology towards ultra-thin thicknesses. Such as the dense-graded ultra-thin cover using warm mix technology, the open-graded ultra-thin cover using Shell technology, the ultra-thin cover using rubber asphalt technology, etc. At present, the thinnest thickness of the cover can be achieved below 2.0mm.