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What is the softening point of asphalt?
The temperature at which an asphalt specimen softens upon heating and begins to sag. The test involves specific equipment and procedures, and different types of asphalt have different softening points. For engineering applications, the softening point of asphalt should not be too low or too high; otherwise, it may melt in summer, become brittle and crack in winter, and become difficult to work with. The softening point reflects the asphalt's viscosity, high-temperature stability, and temperature sensitivity.
2015-07-09
The Relationship Between Penetration and Softening Point of Petroleum Asphalt
Penetration refers to the depth to which a standard needle penetrates an asphalt specimen at a specified temperature over a given period of time. Therefore, the softer the asphalt, the greater its penetration value will certainly be. These two properties are unrelated: penetration measures the depth to which a standard needle from a penetration tester sinks into an asphalt specimen at 25°C, while the softening point is the temperature at which a standard ball, under a specific heating rate, just begins to sink to a predetermined position within the specimen.
2015-07-06
Asphalt testing instruments have different sampling methods and sample storage methods.
The sampling procedure using asphalt testing equipment differs slightly between batch-mixed asphalt and poured-asphalt mixtures, as different sampling methods are required. Below, we’ll introduce these methods one by one: 1. Sampling during loading or unloading: When sampling during the loading or unloading process, take at least three evenly spaced samples at regular intervals. After thoroughly mixing these samples, collect a representative sample of the required quantity. Alternatively, each individual sample can be tested separately. 2. Sampling from an asphalt storage tank: Before sampling from an asphalt storage tank, the asphalt should first be heated and melted, then pumped through pipelines or via an asphalt pump into an asphalt heating pot before taking the sample. Asphalt instrument-based testing.
2015-05-20
Sharing the main technical specifications of the rotary compactor.
The gyratory compactor is a core instrument used in the design of asphalt mixtures. It is typically employed to prepare specimens for determining the mechanical and volumetric properties of hot-mix asphalt mixtures. Operating at a constant compaction pressure of 600 kPa, with a compaction angle of 1.25° and a rotation speed of 30 rpm, the gyratory compactor simulates the in-situ rolling conditions of road rollers. The compacted specimens produced by this machine closely resemble actual pavement surfaces in terms of density, aggregate distribution, and structural characteristics. The four-column frame of the gyratory compactor is exceptionally stable and robust. Vertical stress is measured using a load cell, allowing for precise control throughout the compaction process. The gyratory motion...
2014-04-09
Ten Key Points for Analyzing the Technical Parameters of a Rotary Compactor
We have certain reference standards for the rotary compaction tester technology. So, what are the standard specifications for these parameters? Let’s go through them one by one: 1. The outer diameter of the loading plunger on the rotary compaction tester is φ149.65 mm ± 0.10 mm and φ99.65 mm ± 0.10 mm. 2. The pressure range of the rotary compaction tester is continuously adjustable from 200 to 1000 kPa. 3. The vertical compressive stress applied by the loading device onto the base plane of the test mold is as follows: during the initial 0 to 5 tests, it should be 600 kPa ± 60 kPa; after more than five tests, the pressure should remain constant at 600 kPa ± 18 kPa. 4. Rotary
2014-04-09