In the early 20th century, along with engineering material prices continued to decline in the price of asphalt, bitumen show more sense. In 1907, the first asphalt members in the United States put into use. In 1914, in order to obtain better refractive index bitumen content, people in Berlin for the first time to see the racing lane asphalt pavement, followed by asphalt road Engineering asphalt use, in 1923, applied asphalt dam seal. In order to accelerate the construction progress and improved member in 1924 in California for the first time the road was completed acceptance testing. In order to determine the quality of building materials, the next few years, many testing procedures to be developed. These programs are still valid today applied traffic engineering research, design and concrete construction were. In 1936 the development of the invention the Ring und Kugel-Versuch, one year after the invention of Brechpunkt nach Fraa & szlig, 1941 invented the Marshall test (Marshall-Test). Through special additives, 1950, at a low temperature state Asphalt possible (referred to as cold asphalt). In order to determine the appropriate thickness of asphalt structure, in 1959, developed in Austria by non-intrusive research and isotope method has been successfully verified. In order to make the airport runway in use as soon as possible, in 1963 there has been a dry asphalt construction technology in the UK. 1968 shortly after the first appearance of Ma Ti asphalt construction. In the 1970s the United States began the practice of recycling asphalt. For better sealing effect, in 1979, it began using asphalt dump project. Petroleum bitumen can be classified according to the following system: the production process (1) distillation: atmospheric distillation of crude oil is separated gasoline, kerosene, diesel and other light fractions, and then by vacuum distillation (residual pressure 10 ~ 100mmHg) separated When VGO remaining residue consistent with road asphalt specifications can directly produce asphalt products bitumen, bitumen, also known as income straight asphalt, it is the main method of production of road asphalt. (2) Solvent precipitation method: non-polar low molecular weight alkanes solvent residue in the components have different solubility decompression using solubility difference can achieve separation of components, which can be removed from the vacuum residue of adverse nature asphalt component production to meet the specifications of asphalt products, which is a solvent precipitation method. Bitumen prices, asphalt, three-level chemical provided by Jinan three ping Chemical Co. Jinan three ping Chemical Co. (www.sanpinghuagong.com) strong, credible, in Jinan, Shandong chemical products industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead three levels of chemical into the brilliant and you work for a better future!