Hyberdized Modified Asphalt (HMA) with Enhanced PG Plus Characteristics

It was observed that this new system of making  Modified asphalt is based on the mechanism of hyberdizing the polymer with crumb rubber or used tire rubber by using specialized X-Linking System developed by PhalTech Corporation.. The Hyberdization of polymer with used tire rubber has a couple of positive impacts on the modification of asphalt.  This  technique of hyberdization shows simultaneous improvement for both low and high temperature rheological properties of HMA. This new development of making Hyberdized Modified Asphalt (HMA) can also lead to successfully transitioning  the SUPERPAVE Performance Grade (PG) SYSTEM into   SUPERPAVE PG PLUS SYSTEM, which is also the desire of the time. HMA shows significant improvements for both ductility and elastic recovery (ER) of HMA.

The hyberdization technology allows the system to make a modified binder with enhanced rheological properties of the HMA. It shows four Performance Grade (PG) bump from Asphalt Cement (AC) AC-5 (PG 52-34 to 76-34) improving to AC-60/70, with Ductility of 40 cm, elastic recovery of  between 73-75% at 4⁰C. The huberdization technology shows that it can stretch the high temperature PG box by keeping the low temperature rheological properties or the low temperature PG box as it is or with slight improvement.

It was also observed that the hyberdization technology allows to digest the used tire rubber completely and the solubility test shows over 98% soluble in Tri-Choloro Ethylene (TCE) and the left over two percent was carbon black.

This new development opens a new venture in HMA technology for making modified binder with significantly improved PG plus properties can leads towards a very durable modified binder with increased pavement life. Currently HMA is being used in northern climate  

KEY WORDS: Recycling, pavement, crumb rubber, treated crumb rubber, modified asphalt, environment, crumb rubber modified asphalt, used tire rubber.