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Causes of Asphalt Cracking in Cast-in-Place Asphalt Mixtures
With the development of traditional fatigue failure theories, it has become clear that pavement damage occurs when repeated loading-induced fatigue stresses in the pavement materials exceed the tensile strength of the pavement mixture. On roads, vehicles—primarily automobiles—are the primary users of the pavement and also the main factors causing pavement structural damage and subgrade instability. However, as traffic volume increases, axle loads grow heavier, driving speeds on highways rise, and the vibrational characteristics of traffic loads become more pronounced, the impact of these traffic-load factors—including the rationality of traffic parameter determination—on the early-stage deterioration of asphalt concrete pavements is an issue that cannot be overlooked.
2019-01-23
Operation of the Rotary Compaction Tester
Place the steel mold into the rotary compaction chamber, close the glass door, and then press the start button to initiate the rotary compaction program. The rotary compaction machine will automatically rotate and compact the mold to form the desired shape.
2019-01-23
Detection of Damage Conditions in Cast-in-Place Asphalt Mixture Pavements
During service, cast-in-place asphalt pavement often suffers from a wide variety of damages. These damages not only affect the structural performance and load-bearing capacity of the pavement but also impair its functional performance. Therefore, the detection of asphalt pavement damage is of great significance for pavement maintenance. The technologies used for asphalt pavement inspection are continuously evolving. The trend is shifting from static to dynamic inspection, from manual methods to automation, from destructive to non-destructive testing, and from single-item inspections to integrated assessments. As a result, inspection speeds are increasing, efficiency is improving, and the accuracy of results is steadily rising.
2019-01-23
Machinery used in preventive maintenance of cast-in-place asphalt pavement.
Pressure-type crack-sealing machines employ manual operation for crack sealing. Although this method can prevent rainwater from penetrating the pavement base and slow down further crack development, it delivers excellent sealing results, thereby extending the service life of the pavement and enhancing both the safety and comfort of vehicles traveling on it. Such machines should primarily be equipped with a pressure-control device and a heating or insulation system for the sealing material. To prevent blockage of the spray gun hose, appropriate heating and insulation measures must also be implemented. Domestically produced models include trailer-mounted crack-sealing machines manufactured by Anshan Senyuan and Beijing Zhenglutong, as well as hand-push crack-sealing machines made by Nanjing Shuangliyuan.
2019-01-23
