The asphalt road for daily travel seems to be flat and firm, but in fact, there are many inherent shortcomings in ordinary asphalt: high temperature in summer is easy to soften and deform, rutting occurs, low temperature in winter is easy to harden and crack, long-term vehicle rolling, rain washing and sun aging, but also pit, loose, peeling and other diseases, greatly shortening the service life of the road. Asphalt modifier is the core chemical material specially used to make up for the defects of ordinary asphalt, upgrade asphalt performance and improve road quality. It is also an indispensable key auxiliary material for modern high-standard road construction. 

Asphalt warm mix is a chemical additive that changes the physical state of asphalt materials under specific temperature conditions.The mechanism is to adjust the interaction force of the internal microstructure of asphalt mixture, so that the material can still maintain sufficient fluidity and compactibility at relatively low temperature.

Asphalt pavement paving is the core process of road engineering construction. The paving quality directly determines the flatness, compactness, durability and driving comfort of pavement. It is also the key link in the quality acceptance of different grades of pavement such as expressway, municipal trunk road and rural road. Asphalt pavement paving construction has the characteristics of continuity, refinement and high standardization. It is necessary to strictly follow the industry construction standards, control from raw materials, equipment, technology, environment and other dimensions, and avoid quality diseases such as pavement cracking, displacement, pit and poor flatness. Based on the current road construction specifications, this paper systematically expounds the core quality standards and standardized construction requirements for asphalt pavement paving. 

In road engineering construction, asphalt mixing plant is the key equipment to ensure asphalt mixture production quality, construction efficiency and engineering benefits. The mainstream intermittent and drum asphalt mixing plants in the market have their own advantages and disadvantages, and there is no universal model that adapts to all construction scenarios. The project construction unit shall combine the actual working conditions of the project, accurately match the equipment by relying on the core selection elements, balance the construction efficiency and project cost on the premise of ensuring the pavement construction quality, and realize the maximization of project benefits. Combined with the actual project, this paper combs the four core selection elements of asphalt mixing plant, and gives the corresponding equipment adaptation scheme for different construction scenarios. 

In road maintenance and asphalt construction, asphalt emulsifier is the core additive to realize normal temperature asphalt construction, widely used in slurry seal layer, micro-surface, viscous oil, priming oil, cold regeneration construction and other scenes, effectively solving the pain point of traditional hot asphalt high temperature construction with high energy consumption and limited by seasonal weather. This paper explains the core definition, category characteristics and standardized use method of asphalt emulsifier. 

Batch asphalt mixing plant and drum asphalt mixing plant are two kinds of mainstream core equipment for asphalt mixture production in road engineering, which are widely used in various highway and municipal pavement construction and maintenance projects. Although both of them can produce asphalt mixture meeting construction standards, there are essential differences in production principle, operation mode, quality accuracy, flexibility and application scenarios. Batch mixing plant is a periodic intermittent production, with the characteristics of high batching accuracy, flexible ratio switching, stable finished product quality, suitable for high-grade, multi-formula, high-quality requirements of fine engineering; drum mixing plant adopts drying and mixing integrated continuous operation mode, simple structure, large output, low production cost, more suitable for large-scale, long-cycle, single ratio of ordinary road infrastructure projects. Accurately clarifying the performance differences and core advantages of the two types of equipment can provide scientific basis for project selection and help the project achieve an optimal balance between construction quality, construction efficiency and project cost. 

Asphalt cold repair material is a new type of pavement repair material which can be constructed at normal temperature without high temperature heating. It is made of matrix asphalt, modifier, aggregate and special auxiliary agent. It completely breaks the limitation of traditional hot mix asphalt construction depending on high temperature and special working condition. With convenient construction characteristics, it is widely used in road pit, crack, settlement repair and emergency rescue engineering, and is one of the core materials for municipal roads and highway maintenance. Combined with the actual construction scene, its advantages and disadvantages are very clear, as follows: 

Asphalt mixing equipment (asphalt concrete mixing plant) is the core complete set of equipment for infrastructure projects such as highway, municipal administration, airport, port and industrial park pavement. It undertakes key processes such as aggregate drying and screening, asphalt mixing, powder supply, waste recycling and environmental protection dust removal, which directly determines the quality, production efficiency, environmental protection level and comprehensive cost of asphalt mixture.At present, the global infrastructure recovery, road maintenance demand continues to release, asphalt mixing equipment market grows steadily, the industry is mainly divided into three camps: European and American century high-end brand, Japanese Seiko brand, China head construction machinery and professional pavement equipment brand.Each brand has obvious differences in technical route, product positioning and service system. In order to facilitate engineering selection, industry research and foreign trade reference, this paper systematically analyzes the top ten mainstream asphalt mixing equipment manufacturers in the world from four dimensions: enterprise background, global layout, core advantages and product shortcomings.

Asphalt mixture is the core material of highway, municipal road and bridge pavement engineering. The quality of mixture directly determines the flatness, compactness, waterproof, wear resistance and service life of asphalt pavement, which is the core key to ensure the quality of road engineering. As the only production source of asphalt mixture, the asphalt mixing plant has a direct impact on the uniformity, stability and compliance of each batch of materials due to its production control level, equipment operation status, process operation standards and raw material control details. In the construction of road engineering, most of the early road diseases, such as potholes, looseness, peeling, water seepage, rutting, poor flatness and other problems, are mostly concentrated in the production links such as substandard discharge quality of mixing station, unbalanced mixture ratio, excessive temperature deviation and uneven mixing. Therefore, establishing a set of full-process, standardized and refined discharge quality control system, strictly controlling details in all links from raw material mobilization, equipment operation and maintenance, parameter setting, mixing production to finished product discharge and loading transportation, is the core measure for asphalt mixing plant to stably output high-quality mixture, avoid project quality risk and reduce construction rework cost. This article will combine with the actual production conditions, all-round, fine explanation of asphalt mixing plant discharge quality control points. 

Slurry sealing vehicle is the core special equipment in the field of highway preventive maintenance. It is different from the high temperature construction mode of traditional asphalt paving equipment. Its core advantages lie in cold mixing at normal temperature, paving at normal temperature and rapid prototyping. Relying on multi-system coordination, the whole vehicle completes automatic metering, continuous mixing and uniform paving of emulsified asphalt, coarse and fine aggregate, mineral powder filler, clear water, special additive and other pavement maintenance raw materials according to the precise proportion of engineering design, and finally forms an ultra-thin, dense, waterproof, wear-resistant and skid-resistant asphalt slurry sealing layer on the original pavement, realizing the maintenance effect of pavement micro-crack sealing, surface waterproofing, wear-resistant reinforcement and disease repair. In order to accurately select, standardize operation and efficiently operate slurry sealing vehicles, it is necessary to thoroughly master the overall working principle, operation logic of each system and the core mechanism of pavement forming. This paper will give a comprehensive and detailed explanation from the four dimensions of equipment system composition, step-by-step operation principle, mixture forming and curing principle and difference between two types of models.