Shenzhen Zhongheng Asphalt Engineering Co., Ltd. specializes in municipal asphalt road construction. The company has a technical and engineering management center, as well as a equipment rental center. It boasts a professional team for municipal engineering asphalt road construction and is a type of company engaged in asphalt road construction, maintenance, and repair. The company undertakes large and small asphalt road construction projects in Shenzhen and the Pearl River Delta region, including municipal road projects, garden residential complexes, school tracks, industrial area roads, and indoor/outdoor parking lots. The company has extensive experience in subgrade and road surface construction, with an excellent management and construction team. It can provide high-quality construction plans according to the site conditions and the owner's requirements. The company can dispatch various imported construction machinery such as road graders, pavers, large and small rollers, and asphalt materials of various brands for asphalt concrete construction. The asphalt materials primarily used for road construction are petroleum asphalt and, in addition, there is natural asphalt. Some countries or regions also use or blend natural asphalt. Depending on the type of aggregate used, it can be categorized into crushed stone, gravel, sandy, and slag types, with crushed stone being the most commonly used. The properties and specifications of asphalt vary with the type of asphalt road, the regional climate, and traffic conditions of the section; in hot regions and on heavy traffic roads, it is advisable to use thicker asphalt; while in cold regions and on light traffic roads, thinner asphalt is preferable. According to the particle size of the mixture, it can be divided into coarse (below 35-40mm), medium (below 20-25mm), fine (below 10-15mm), and sand (below 5-7mm) categories. Based on the degree of compaction of the mixture, it can be classified into dense, semi-open, and open graded mixes, with open graded mixes also known as asphalt aggregates. ① Compacted type. Asphalt concrete mixtures are mostly prepared using hot mix hot lay methods, which have good road properties, thus requiring higher standards for the production process and raw materials, with most using centralized factory mixing. The most commonly used asphalt concrete mixture is the compacted type, which requires heavy machinery to compact the mixture before shaping, hence some countries refer to it as compacted asphalt. After shaping, the road surface is smooth, dense, and low in dust, with a certain roughness, providing good driving comfort and appearance; it also has good aging resistance, wear resistance, temperature stability, and resistance to traffic damage. The service life is generally long, and when petroleum asphalt is used as the binder, the maintenance interval is often over 15 years! ③ Paving type. Hot mix hot lay asphalt concrete mixtures can be shaped without the need for heavy machinery compaction, commonly known as paving asphalt. To ensure proper flow of the paving asphalt mixture during laying.