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Bending Creep Test Instructions
The vertical loading method avoids the drawback of inconsistent load caused by structural inadequacy, ensuring reliable performance.
2012-08-31
Introduction to Cast-in-Place Asphalt Mixtures
By examining the performance of different limestone fines and preparing cast-in-place asphalt mixtures using various limestone fines, this study investigates how different fines and their respective properties affect the thermal stability of cast-in-place asphalt mixtures. Cast-in-place asphalt mixture is a dense-graded pavement material; when applied to steel bridge decks, it is crucial to pay close attention to the analysis of its high-temperature stability. The study explores the impacts of material composition factors—such as asphalt content, coarse and fine aggregate proportions, and the fines-to-binder ratio—as well as structural factors—including structural thickness—on the high-temperature stability of cast-in-place asphalt mixtures. Furthermore, it proposes technical measures to enhance the high-temperature stability of these mixtures.
2012-08-29
Characteristics of the Rotary Compactor
The rotary compactor is regarded as one of the best laboratory methods for compacting asphalt mixture specimens, used to evaluate the compaction characteristics and field performance of test specimens. Compaction is achieved by applying vertical stress via end plates while the mold’s longitudinal axis rotates at a fixed angle relative to the vertical direction, with the upper and lower end plates remaining parallel. During compaction, the specimen height is automatically measured, and the test density and void ratio are calculated. Operators can choose to compact the specimen to a specified number of rotations or to a target density or void ratio. The primary challenges associated with the rotary compactor revolve around improving manufacturing quality and enhancing ease of use. The compactor molds, when filled with mixtures, are heavy and often extremely hot.
2012-08-24
High-temperature performance of cast-in-place asphalt mixtures
Pouring-type asphalt mixtures are paved using a pouring method that eliminates the need for compaction; they solidify upon cooling and exhibit virtually no voids. This type of pouring-type asphalt mixture boasts impermeability, excellent deformation resistance, freeze-thaw durability, oil resistance, aging resistance, superior overall integrity, and outstanding performance in resisting low-temperature cracking and fatigue cracking. Previously, the high-temperature stability of pouring-type mixtures was evaluated using tests such as the Marshall test and high-temperature rutting tests. In this paper, we conduct a study—using the penetration test, currently the most widely applied method—from several perspectives including aggregate gradation, binder type, binder content, and mineral powder. The asphalt binder used in these pouring-type asphalt concretes is specifically developed for pouring-type asphalt concrete. Pouring-type asphalt...
2012-08-15
Characteristics of Cast-in-Place Asphalt Mixtures
Pouring-type asphalt mixtures differ from conventional compacted asphalt mixtures in that they are composed of high-content, high-viscosity asphalt, a high dosage of mineral powder, and sometimes fiber additives, all combined with an appropriate amount of aggregate. After being thoroughly mixed and heated at high temperatures for an extended period, this process yields a special asphalt mixture that is highly viscous yet exhibits excellent fluidity and has a void content of less than 1%. It boasts superior waterproof performance; due to its void content being less than 1%, nearly approaching zero, it demonstrates outstanding water resistance. Moreover, it possesses exceptional flexibility: with its relatively high asphalt content, this mixture exhibits strong deformability and good flexibility, allowing it to closely conform to steel bridge decks. As a result, the mixture integrates seamlessly with the bridge deck surface, forming a unified whole.
2012-08-10