Increasing traffic volume, axle loads and varying climatic conditions have led to the development of improved constructions materials and techniques in all areas of road and airport pavement construction, repair and maintenance. On most road in india the traffic loadings are very heavy in terms of both the number and intensity of axle loads. There are regions where climatic conditions are extreme. At times, one would wish that some of the bitumen being used were slower to age and had better gellation. The search for such materials ends with Ooms PMB, which has properties that can go significantly beyond those available from conventional bitumen and other modified bitumen, now available in the Indian market.
With age, bitumen loses its gelling property, which causes the viscosity to increase. In addition molecular weight of bitumen increases, as a result, the material becomes brittle losing its binding property.
The limitation of bitumen and desired properties of a bituminous binder should be considered when selecting polymers for use in polymer bitumen blends. In addition, the following conditions must be met:
# Compatibility of the polymer-bitumen blend must be adequate to prevent segregation of the blend with extended storage at elevated temperatures(160°C-180°C)
# Consistency of the polymer-bitumen blend at application temperature should not deviate considerably from the properties of conventional in order to allow use of existing equipment and paving practices.
Ooms PMB uses a process, identified as “Gellation Technology” for modifying bitumen with polymer. This technology helps in stabilizing the polymer matrix chain into the bitumen phase.
Laying and compaction procedures are not affected when using Ooms PMB binders. Ooms PMB overlays show superior performance during service life as compared to similar overlays with conventional binders. The overlay thickness with Ooms PMB binders can be reduced substantially, depending upon requirements put on overlay design with overall of maintenance 20 to 40% less than when design utilizes conventional products. The polymer modification adopted in Ooms PMB “Gellation Technology” aids in preventing premature thermal cracking, thermal and mechanical fatigue. In addition the aging of Ooms PMB binder will be significantly slower than conventional products. As a result, Ooms PMB binders provide improved overlay design and substantial life cycle cost savings.
Bituminous mixes based on Ooms PMB binders are characterized by:
# High resistance to fatigue, aging, stripping and cracking
# Low temperature susceptibility
# High flexibility
# High stability