Mixing natural bitumen with native bitumen sodium asphalt sulfonate can also get some primary solid bitumen up to 30 1.10mm when using a needle. Foreign research and engineering applications believe that high melting point natural asphalt can significantly improve the temperature resistance, water resistance and aging resistance of asphalt as a modifier. Among them, aphids and North American natural asphalt are the most experienced and widely used.

In recent years, my country has proved that Xinjiang, Sichuan and other places contain rich natural stone asphalt resources. However, different natural asphalts have different compositions and physical properties, and the effect of modified petroleum asphalt is also different, which also brings different cost performance. The laboratory compared Qingchuan bitumen, Algerian bitumen and bud bitumen, and found significant differences in their content. In addition, the presence and content of organic non-solvents are significantly different from those of the base asphalt modification.

Through laboratory stirring and trial production, the infiltration, softening and tensile performance indexes of the above natural asphalt products were obtained. The test results show that different natural asphalts modify the gel (penetration index PI), sodium asphalt sulfonate resulting in different modification properties, mainly in terms of consistency and ductility.

Under the same ratio, the softening point and viscosity of modified Zinchuan asphalt are higher, and the permeability is lower than the other two natural asphalts. The content of 5.10% can change the bitumen within 30 pitches; however, Algeria and Butonite bitumen demand exceeds 15%. Assume that the penetration rate reaches 25% (assuming that the penetration rate is 25%, the penetration rate of Buton Rock asphalt will not drop below 50 1/10 mm). It is pointed out that natural asphalts with different components and properties have different solubility and tolerance in the same basic asphalt in the same process, and have different asphalt modifications; for some soft natural asphalts, with the increase of hard asphalt content, it can decrease Value for money.

Although natural bitumen decreases the penetration rate and advances the softening temperature, it is also characterized by a rapid decay of the ductility index, which has been proven in many literatures. Assuming that the rock asphalt of Algeria and Qingchuan is close to 30 1/10mm, the ductility does not meet the lower limit of C 20cm of the JTG F40 specification, in this sense, both natural modified asphalt and primary road asphalt have the same defects, namely, because The strength and durability of asphalt, the ductility of asphalt is high.

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