Preventive Maintenance is a former road surface damage to conservation; corrective conservation means road repair local damage to certain diseases or for processing; emergency conservation is an emergency measure in asphalt stock, for example, burst and serious road pothole in need of immediate repair to the opening of the. In complete petrochemical industrial chain, front-end products for the petroleum pitch ether, dioxane, hydrocarbons, benzene and other major categories of products, as crude petroleum bitumen processing back-end products available through the coking process petroleum jelly. As science and technology progress and economic development of asphalt construction purposes, we will further promote the development of modified asphalt product development and production technology. Modified varieties and preparation techniques depending on the type modifier amount and asphalt (ie raw bitumen) the composition and properties. Since the modifier variety, shapes and sizes, in order to make it uniform for practical engineering materials and petroleum bitumen, evaluated over the years for various types modifiers, and develop the appropriate recipes and preparation methods, but most modified asphalt has practical engineering technology subject to patents and patented products. Asphalt manufacturers _ three level chemical quality assurance (certification) _ asphalt provided by the Jinan Chemical Co., Ltd. three levels. 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.