The first two have a continuous polymer network, have a stable structure that doesn't separate, and take full advantage of the elastic properties of the polymer. The second two are not networked, separate on storage, and don't have the same enhancement in properties. Some PMAC producers use special processes to compatibilize polymer and asphalt. When the technology is right, the binder properties can reduce rutting, raveling, thermal cracking and stripping in the mix, as well as increase the stability and fatigue life. Manufacture, storage and construction practices vary with polymer system Conventional manufacture, storage and construction practices may or may not need to be modified depending upon the polymer system used.
Some systems require constant agitation to avoid segregation.
Some polymer systems specify elevated temperatures for hot mix manufacture and construction, others can be run at conventional temperatures. Current methods of determining optimum mix and compaction temperatures do not take into account the changed flow properties of the modified binder. Recommended temperature and placement practices for a particular system should be followed. Improvement in resistance to rutting, thermal cracking, fatigue damage, stripping, and temperature susceptibility have led polymer modified binders to be substituted for asphalt in virtually all paving and maintenance applications, including hot mix , warm mix - cold lay, cold mix , chip seals , hot and cold crackfilling , patching, recycling , and slurry seal. They are used wherever extra performance and durability are desired.