Polymer Modified Bitumen

Superpave (superior performing asphalt pavement) is a mix design system for new construction and overlays. The system uses a series of new performance based specifications, test methods and practices for material selection, accelerated performance testing and mix design. Superpave performance grade is based on the idea that a hot mix asphalt binders properties should be related to the conditions under which it is used. Fundamental properties based on rheology which use tests that evaluate the material properties , stress, strain and strain rate over a wide range of temperature, loading and aging conditions. Rheology is the study of the flow of matters under conditions in which they respond with plastic flow rather than deforming elastically in response to an applied force. Some asphalt require modification in order to meet specifications to improve pavement durability, to increase serviceable temperature range and to lower life cycle cost. Grades of polymer modified bitumen (PMB). From the temperature zoning map for KSA, the area was divided to four regions included three types of grades PG 70 – 10, PG 76 -10 and PG 82-10.
PG: performance grade