VG Grade Bitumen
According to viscosity (degree of fluidity) grading, higher the grade, stiffer the Bitumen. Furthermore VG Grade Bitumen can be done on original (as-supplied) asphalt binder samples ( AC grading). Also aged residue samples (AR grading). AR viscosity test is based on viscosity of aged residue from rolling thin film oven test.
With AC grading, asphalt binder is specify by properties it possesses before it undergoes HMA making flow. AR grading system is an attempt to simulate asphalt binder properties after it undergoes a typical HMA manufacturing process and thus, it should be more representative of how asphalt binder behaves in HMA pavements.
VG Asphalt Application : VG Grade Bitumen
Cutback bitumen MC250 consist of initial incorporation of asphalt into the surface of non-asphalt based course preparatory to any superimposed treatment of construction. In addition cutback asphalt MC-250 applying to waterproofing of surfaces, plug capillary voids, coat and bond loose mineral particles. Also cutback agents are used to lower the viscosity of bitumen when it is applied as a primer to the surface of a road pavement aggregate base course or substrate. Furthermore we use Kerosene as a bitumen cutback agent at different concentrations according to local conditions and requirements. Cutback bitumen is ideal for prime coat and cold applied because of easy uses. Also it no nees to thinning and heating.
Viscosity Bitumen Grading : VG Grade Bitumen
VG bitumen categorized according to Viscosity (degree of fluidity) grading. Furthermore viscosity tests conducted at 60°C & 135°C. It shows road surface temperature during summer and mixing temperature. Penetration at 25°C, also retained in Specs.
VG BITUMEN : VG Grade Bitumen
VG-10 is widely used in spraying applications such as surface-dressing and paving in very cold climate in lieu of old 80/100 Penetration grade. It`s also uses in Bitumen Emulsion and Modified Bitumen. VG-20 is used for paving in cold climate & high altitude regions VG-30 is primarily used to construct extra heavy duty Bitumen pavements that need to endure substantial traffic loads. Also it can be used in lieu of Bitumen 60/70. VG-40 is used in highly stressed areas such as intersections, near toll booths and truck parking lots in lieu of old 30/40 Penetration grade. Due to its higher viscosity, stiffer Bitumen mixes can produced to improve resistance to shoving and other problems associated with higher temperature and heavy traffic loads.