Tests hardening evaporative oxide bitumen in the mix

Hardening oxide and evaporating a thin film of bitumen in relation to grain mix done by two tests: test the storage of hot mix asphalt production equipment and changes in the softening point of bitumen. Test storage of hot mix during mixing and storage conditions of aging in check.. Aging bitumen during mixing and storage stored by the difference between the softening point of bitumen and the original expression.

This test is very hard on a laboratory scale and changes in the softening point much more than what is actually happening in storage. However, this test is associated with a tendency to hardly mix at high temperature for a long time when it is in contact with air.

Hardening of bitumen seeps
When bitumen is in contact with the porous nature of the bitumen mineral aggregate balance and an oily substance seeps into the pores of aggregates. This can lead to hardening of bitumen remaining in the aggregate. Is primarily a function of the amount of leakage paraffin compounds with low molecular weight in proportion to the amount and type of bitumen is Stfaltn.

Scientists test for measuring the leakage drop slightly inclined bitumen seeps have designed. In this test, droplets of bitumen on the troughs of marble plates are used. Plates for 4 days at 60 ° C in the presence of nitrogen are kept. During that time, collars around droplets of oily bitumen spread, the rings in the presence of ultraviolet light and visible with a microscope. The width of the rings of a few tenths of a millimeter to several mm for a balanced ,it is nonequilibrium.

Hardening in the service of leakage can be substantial, and not only on the willingness of bitumen seeps into the pores of aggregate but also be relevant. If the pores of mineral aggregate small amounts of leakage absorption is negligible, regardless tend to leak and ooze Similarly, if you tend to be low regardless of pores ooze amount absorbed will be negligible.