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Softness of bituminous material is defined as the temperature at which the bitumen sample can no longer support the weight of the ball 3.5g. Although it is commonly used in Europe, it is usually applied to asphalt roof in America. Basically, two horizontal disks of bitumen, cast in shouldered brass ring, is heated at a controlled rate in a liquid bath while every supporting steel balls. Point tenderness was reported as the mean temperature at which the two disks soften enough to allow each ball, enveloped in bitumen, dropped a 25 mm (1.0 inches)

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Adolf Rohan

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Q: What are the factors that affect differences in the results of the ring and ball test?
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