iv) mixing the PMA blend for a period of time to allow {HEAD ~ a polymer network} to form within {TAIL ~ the first and second asphalt}, wherein the mixing step is performed without substantial delay following blending step iii) 
to form within
iv ) mixing the PMA blend for a period of time to allow { HEAD ~ a polymer network } to form within { TAIL ~ the first and second asphalt } , wherein the mixing step is performed without substantial delay following blending step iii )
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH