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admixture of gilsonite to bitumen increase softening point of asphalt and prevent deformation of road. Gilsonite asphalt grade is natural occurring hydrocarbon substances characterized by a high softening point (above 110° C) in the class known as asphaltite. They are mined much like other minerals and sold essentially in their native state.
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LP-16 Softening Point Ring and Ball Apparatus determine the softening point of asphalt, coal tar pitch and other viscoelastic bitumens in the range of 30°—157°C (86°—315°F). The unit simultaneously tests two samples for optimal compliance with standard test procedures. Steel balls are placed on top of bitumen specimen disks in test rings in a bath.
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Key points Softening point denotes the temperature at which the bitumen attains a particular degree of softening under the specifications of test. As per code, it is the temperature in °C at which a standard ball passes through a sample of bitumen in a mould and falls through a height of 2.5 cm, when heated under water or glycerine at ...
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Oct 24, 2013· Softening point of Bitumen: It is the minimum temperature at which bitumen get soft. It is important to find the softening point of Bitumen because bitumen can be easily applied on the road surface when it is soft and we have to use the fuel and fire to soften the available bitumen. Softening point tells us about the amount of …
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Mainly, it serves its use in paving and roofing applications, used as a binder for roads, runways, parking lots, and foot paths. Key points Softening point denotes the temperature at which the bitumen attains a particular degree of softening under the specifications of test. As per code, it is the temperature in °C at which a standard ball passes through a …
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Therefore, the viscosity and softening point of bitumen increase and bitumen penetration decreases. Blowing air is done in two ways, Air Rectification and Fully Air. A. Air Rectification. In the air rectification method, the air is blown to a mild degree. In this method, minor changes in the physical properties of bitumen such as reducing ...
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SOFTENING POINT. Bitumens are viscoelastic materials without sharply defined melting points; they gradually become softer and less viscous as the temperature rises. The …
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The softening point of bitumen used in the pavement construction varies between 35° to 70°.It indicates how susceptible the bitumen with respect to the variation of temperature. Bitumen of the same penetration value with a higher softening point is less susceptible to temperature than of that same grade bitumen saving less softening point.
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Apr 11, 2017· The point at which the bitumen or the tar is softened is the accurate temperature substance achieves specific degree of softening. As per IS: 334-1982, it is the precise temperature in ºC at which an average ball permits through a specimen of bitumen in a mould and discharges through a stature of 2.5 cm, when extensively warmed under …
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The softening point is calculated as the average of the temperatures at which the two discs soften sufficiently for each bitumen-encased ball to fall 25 mm. 2 OBJECTIVE To determine the softening point of bitumen within the range 30 to 157 °C by means of the Ring-and-Ball apparatus. 3 APPARATUS 1. Ball and ring test apparatus 5 FORM AND ...
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Softening point test. The consistency of a penetration grade or oxidized bitumen can also be measured by determining its softening pOint1157'1581. In this test, a steel ball (weight 3.5 g) is placed on a sample of bitumen contained in a brass ring that is then suspended in a water or glycerin bath. The apparatus is shown in Fig. 7.2.
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SOFTENING POINT. Discussion. Bitumen can have dierent sources, in which we can say the source of our bitumen is the construcon material laboratory with the convenonal paving type bitumen or also blown bitumen from rening of crude oil. The bitumen need to be cooled by air for 15 min aer being heated.
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The softening point of bitumen can be determined through the use of a ring-and-ball apparatus immersed in distilled water (30 to 80°C) or USP glycerin (above 80 to 157°C). The softening point is reported as the mean of the temperatures at which the two disks soften enough to allow each ball, enveloped in bitumen, to fall a distance of 25 mm ...
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Mar 20, 2013· Maintain the bath temperature at 3-5 degree Celsius for 15 minutes. Using forceps, place a ball previously cooled to a bath temperature in ball guide. Heat the bath from below so that the temperature rises at a uniform rate of 5 degree Celsius per minute. Softening point of bitumen taken as the temperature at which sample soft enough to …
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