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Introduction to Pavement Maintenance for Cast-in-Place Asphalt Mixtures
Introduction to Pavement Maintenance for Cast-in-Place Asphalt Mixtures: Preventive maintenance refers to maintenance operations aimed at protecting the pavement, preventing further deterioration of existing distresses, slowing down the rate of decline in pavement performance, and ultimately extending the service life of the pavement. Preventive maintenance does not have the function of reinforcing the pavement; therefore, it should not be expected to improve the pavement’s strength or load-bearing capacity. Corrective maintenance refers to maintenance operations designed to repair localized damage or specific types of distress on the pavement—operations that have not yet affected the pavement as a whole. Pavement rehabilitation refers to situations where pavement damage has already spread across most of the pavement surface, resulting in comprehensive deterioration.
2019-01-23
Low-Temperature Resistance of Cast-in-Place Asphalt Mixtures
Cast-in-place asphalt mixture is a type of asphalt concrete classified according to its construction process. It is mixed at high temperatures and exhibits high fluidity when laid out, relying on its own flow to achieve dense compaction without the need for rolling. Because cast-in-place asphalt mixture differs from conventional asphalt mixtures, it contains a high proportion of asphalt with exceptionally high viscosity. This type of mixture demonstrates excellent low-temperature performance. I have conducted split tensile and low-temperature beam bending tests on cast-in-place mixtures as low as -35°C, and the results were significantly better than those obtained with conventional asphalt mixtures. Moreover, there is a tendency for the performance of cast-in-place mixtures to improve further as the temperature decreases.
2019-01-23
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