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Which grade of bitumen is hardest?Best deal for bitumen in 2020 market

Bitumen is used in road construction to produce asphalt concrete mix and is one of the components of an asphalt design. Over the past few years, the increase in the price of bitumen and the resulting profit has attracted some opportunists and has produced non-standard bitumen in various ways. And unfortunately, the use of this type of bitumen is common in some projects. Therefore, Bitumen Traders in the global market export this product to other countries.

Bitumen Traders in the global market

Which grade of bitumen is hardest?

Which grade of bitumen is hardest?

Bitumen penetration test is used to determine the relative hardness of blown bitumen and pure bitumen. One of the applications of degree of penetration is in naming pure bitumen and blown bitumen.

Pure bitumens are named only on this basis, but the criterion for naming blown bitumens, in addition to the degree of bitumen penetration, is also the degree of softness of the bitumen. For example, 40-50, 60-70, 85-100 bitumen and bitumen are among the common pure bitumens in road construction.

The two numbers that come with pure bitumen indicate that the degree of bitumen penetration is in this range. Bitumens R85 / 25, R90 / 15, R110 / 10 and… are examples of common blown bitumens in Iran, the first number indicates the degree of penetration of bitumen and the second number indicates the soft point of bitumen.

One of the applications of the results of this experiment is that the hotter the climate of the area where we are going to use the bitumen, or the higher the traffic and the heavier the vehicle load, the more penetrating the bitumen should be. And vice versa, the colder the climate of the area, the less penetration bitumen should be used.

Therefore, the harder the bitumen, the lower the degree of penetration and the higher the degree of penetration of the bitumen, the softer the bitumen. Bitumens with a penetration degree of about 80 are used in asphalts such as asphalt concrete and bitumens with a higher degree of penetration in macadam bitumen and cold asphalt.

This test is described in detail in the following standards:

Standard Methods, IP. 49/58

ASTM Methods, D: 5-52

If we test the degree of penetration at a temperature equal to the softening point of bitumen, a penetration degree of 800 is obtained for all bitumens, so a parameter called the degree of penetration is defined, which indicates the sensitivity of bitumen to temperature changes.

The lower the degree of penetration, the greater the sensitivity of bitumen to temperature changes. For road bitumens, the degree of penetration varies from -2 to +2. This mark is smaller than -2 for tar bitumens and +2 for blown bitumens.

Test method

 

Heat some bitumen to about 60 degrees or a temperature above the softening point and then pour it into a special container. This container has a diameter of 5.5 cm and a height of 3.5 cm. Care must be taken that the bitumen surface is perfectly smooth and free of bubbles.

 

A spatula can be used to smooth the bitumen surface. Expose the container containing the bitumen to the laboratory air to cool the bitumen. Then we put the bitumen container in the hot water bath with a temperature of 25 degrees so that after an hour and a half, the bitumen will reach equilibrium with the water in the bath.

Take the container out of the hot water bath and dry its surface with a cotton cloth. Place the container under the penetration device so that the tip of the needle and the tip of the image match on the glossy surface of the bitumen.

Now we set the degree of the device to zero and by hitting the stopwatch, the needle, which weighs 100 grams with its accessories, is released, and within 5 seconds, the penetration of the needle on the graduated screen is read and recorded.

This test is performed 5 to 10 times for each sample (each container) and the obtained values ​​are recorded. Note that the values ​​obtained are in terms of tenths of a millimeter. Make sure that the spacing of the needles penetrates the bitumen at almost the same distance from each other and is not too close to the edge of the container to reduce the test error.

This number of tests reduces the test error. The average of the obtained numbers will be the same as the degree of penetration of bitumen. For more information about bitumen size of molecules, visit our site.

Best deal for bitumen in 2020 market

Best deal for bitumen in 2020 market

The lake bitumen pit contains 40 to 70% pure bitumen, which is boiled and refined in a tank. The output is refined asphalt used in road construction and industry. You can visit our site for information on Best deal for bitumen in 2020 market.

Davood Panahi

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