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Compaction of pourable asphalt mixtures
Immediately after the paving and leveling of the poured asphalt mixture, the road surface should be inspected. Any irregularities should be promptly adjusted manually, followed by thorough and uniform compaction.
2019-01-23
What is the relationship between penetration and softening point?
Penetration: The depth to which a standard cone—typically loaded with 150 grams, though sometimes specified at 100 grams—penetrates into a grease sample that has been kept at a constant temperature of 25°C within 5 seconds. Softening Point: A steel ball of known mass is placed on a metal ring filled with the test sample. Under specified heating conditions, the steel ball is allowed to fall from a certain height into the sample. The temperature at which the steel ball just touches the lower metal stopper is taken as the softening point, expressed in degrees Celsius (℃). This refers to the temperature at which asphalt reaches a specific viscosity under particular experimental conditions.
2015-07-28
4 Important Notes for the Penetration Test
(1) The precision and allowable tolerances specified for the penetration softening point test are critical parameters. In this method, the precision requirements are formulated as closely as possible to the internationally accepted approach of expressing repeatability and reproducibility. Repeatability testing refers to the condition where, within a short period and in the same laboratory, the same operator using the same instrument on the same sample performs the test procedure more than twice; the error between the resulting test results should not exceed the specified allowable tolerance. Reproducibility testing refers to the condition where, in two or more different laboratories, separate operators using their own instruments and following the same test procedure perform the test on the same sample; the resulting test results—
2015-07-17
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