A cement overlay is {HEAD ~ a slurry type mixture} of cement, {TAIL ~ sand} and polymers 
of
A cement overlay is { HEAD ~ a slurry type mixture } of cement , { TAIL ~ sand } and polymers
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH