(4) adjusting the lawful: tone pitch originally referred to the legal production of crude oil by the same proportion of four components constituting the pitch according to the quality requirements needed to re-blending, asphalt effect, the resulting product is called synthetic asphalt or asphalt reconstruction. With the development of technology, blending component sources to expand. For example, from one secondary processing residues or components as well as a variety of industrial oils of the same or different crude oil, etc., as blending component, wholesale asphalt, which reduces the production of asphalt in the dependence on oil source selection. With appropriate to create a growing shortage of crude bitumen, tune legitimate show flexibility and economy are increasingly valued and widely used. Through special additives, 1950, at a low temperature state Asphalt possible (referred to as cold asphalt). In order to determine the appropriate structural thickness of asphalt, bitumen, 1959, Shandong asphalt, developed in Austria without interference studies conducted by isotope method and 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 occurrence 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. Asphalt factory, three-level chemical quality assurance (certification), three flat asphalt provided by Jinan Chemical Co. Jinan three ping Chemical Co., Ltd. (www.sanpinghuagong.com) Shandong Jinan, chemical products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Three-ping Chemical leadership with the staff warmly welcome all inquiries negotiations to create three levels of chemical better future.