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Key points of the creep bending test
The LCD screen displays a curve showing the relationship between displacement and time, and automatically determines the test results.
2012-12-12
Study on the Low-Temperature Performance of Cast-in-Place Asphalt Mixtures
What cast asphalt mixtures are well known for is their high-temperature performance. In fact, cast asphalt mixtures also exhibit excellent low-temperature performance. The following is a study on the low-temperature performance of cast asphalt mixtures. Regarding the rutting resistance of cast asphalt mixtures, hard-bitumen cast asphalt mixtures demonstrate superior rutting resistance. Through low-temperature bending tests and fatigue tests conducted on composite pavement structures with steel bridge decks under gradually decreasing temperatures, we tested and compared the low-temperature crack resistance of cast mixtures using hard bitumen. High-performance polymer-modified asphalt cast mixtures feature longer fatigue life and lower fracture temperatures, making them suitable for use in cast asphalt pavements on steel bridge decks.
2012-12-05
Functions of cast-in-place asphalt mixtures
Cast-in-place asphalt mixture is a dense-graded pavement material. When used for steel bridge deck pavements, it is essential to pay close attention to the high-temperature stability analysis of the mixture, taking into account factors such as asphalt content and the proportions of coarse and fine aggregates. Immediately after the cast-in-place asphalt mixture has been spread and leveled, the pavement surface should be inspected; any irregularities should be promptly adjusted manually, followed by thorough and uniform compaction. This type of mixture exhibits excellent characteristics, including impermeability, strong deformation resistance, freeze-thaw durability, oil resistance, aging resistance, good overall integrity, and outstanding performance in resisting low-temperature cracking and fatigue cracking. Previously, the high-temperature stability of cast-in-place mixtures was evaluated using tests such as the Marshall test and high-temperature rutting tests. This paper leverages currently available methods...
2012-11-28
Classification and Principle of Cast-in-Place Asphalt Mixtures
There are various types of poured asphalt mixtures. Below, we will introduce the classification and principles of poured asphalt mixtures based on their different types.
2012-11-21
Fatigue Characteristics of Cast-in-Place Asphalt Mixtures
Pouring-type asphalt mixtures are in a fluid state and generally do not require compaction; construction can be completed simply by using basic paving and leveling equipment, achieving the specified density and smoothness. Pouring-type asphalt mixtures are characterized by high mixing temperatures, high mineral powder content, high asphalt content, and long mixing times. These mixtures exhibit strong adaptability to steel bridge decks, particularly in their resistance to fatigue damage, which differs from that of conventional asphalt mixtures. The fatigue failure criteria applicable to pouring-type asphalt mixtures may not necessarily be suitable for mixtures with high stiffness moduli.
2012-09-05