Mohammed, it depends on a type of polymer used for asphalt modification. Here in North America styrene-butadien-styrene is a common example of an elastomer used for asphalt modifications. Typical use is 2-4% per asphalt binder weight, depending on a base binder and desired improvement of rheological properites. Mixing is perfomed at high shear (typical multiple passes through high shear mill) and than the product is stored at elvated temperature (190-200C) to cure for several hours. SBS only creates kinetically (not thermodynamically) stable blend with asphalt and so the blending process needs some experience.
for the polymer content, it is best to follow the recommendations provided by the suppliers. Otherwise, by doing a simple review you can find out the optimum polymer content for most of the additives.
Now, regarding polymer preparation, several different methods have been used which require high/low shearing rates for various time durations. I have also seen different researchers use different processing methods for the same polymer and I dont think a standard methods has yet been developed. I am working on this issue and my paper might be interesting for you.
Conference Paper EFFECT OF BLENDING SPEEDS ON THE RHEOLOGICAL PROPERTIES OF S...
The type of polymer? if the polymer and asphalt type is not given. the content is an unkonow parameter.
Dear Mohamed...it depend into large extent on the polymer type and the mixing method..so i think its better to follow the product technical specification to determine your request..regards
- Badges
- Science topic
- Similar topics
- Computer Communications (Networks)
- Simulators