Asphalt concrete also called asphaltum concrete, is artificial matching by certain gradation composition of mineral aggregate (crushed stone or crushed gravel, stone chips or sand, slag, etc.) with a proper percentage of road bituminous materials,Road Router Crack mixed under strictly controlled conditions.
Asphalt concrete can be divided into two major categories of petroleum asphalt and coal tar pitch by using different matrix ; some countries are also using or mixing asphalt mixed with natural. By using different varieties can be divided into gravel, gravel, sandy, several types of slag,low carbon Concrete Vibrator agent crushed stone is the most common. By different maximum particle size of the mixture, can be divided into coarse (35 to 40 mm), the granules (20-25 mm), fine particles (10 to 15 mm), sand (5-7 mm), etc. By different compactness of the mix can be divided into dense graded, semi-open-graded and open-graded and several categories, open-graded asphalt mixes, also known as gravel. Wherein the thermal hot mix paved dense Macadam durable,save oil municipal sanitation equipment high strength, good integrity, is the high representative of asphalt pavement construction materials, most widely used application.
Hot mix asphalt mixture should be mixed at a centralized location by mechanical . Generally used in stationary hot mix plant, longer pavements should be used mobile hot mix machine lines. Cold mix asphalt mixtures can be concentrate mixed, also be mixed with at scene. Major equipment of asphalt plant include: hot pot of asphalt, gravel storage place, slag warehouse, heated rollers, mixing machines and weighing equipment,new design riding concrete trowel machine steam boilers, pumps and piping bitumen, dust and other facilities, as well as some hot aggregate re-sub-screen and storage equipment (see asphalt mixing base). Mixing machine can be divided into continuous and batch-type two categories.
China's highway especially the higher level highway are used of semi-rigid road base, pavement cracks are structural cracks, developed from bottom-up. Once the pavement cracks, as the vehicle load run, rain and snow water intrusion will be early damaged. The key of preventive maintenance is to maintain the road at the right time, on a suitable surface, with appropriate technology. According to the actual road conditions, select the appropriate pavement preventive maintenance techniques for guiding highway maintenance work of great significance. Currently, the main technology used in asphalt pavement preventive maintenance are: surface treatment, cold patch repair material, cracks Treatment, Surface Treatment, thin overlay, pavement pouring sealant repair, local regeneration.
Asphalt Concrete Pavement is using the preventive conservation measures in some of the operational phase, in order to timely pavement disease factors and disease nipped in the bud only by selecting the appropriate technology, and effectively extending the road repair, overhaul and reduce road maintenance costs, extend the pavement life, in order to fully maximize the benefits of conservation funds, to enhance the level of road service.
