1. CIM
CITY COMMISSION INFORMATION MEMORANDUM
November 6, 2017
ADMINISTRATIVE BRIEF FROM Jim Kowach
Department of Public Works
Ultrathin Bonded Asphalt Surface (UBAS) is a type of roadway preventative
maintenance surface treatment that
is new to Salina and has recently
been placed on many streets
around the City (including E.
Crawford and S. Broadway). It
consists of a thin, coarse aggregate
hot mix over a special asphalt
membrane similar to a chip seal. It
is placed in one pass with a spray
paver at approxi
and then rolled and compacted to a
(about twice the thickness of a normal
micro-surfacing treatment). The high grade asphaltic membrane prevents water
intrusion and provides a superior bond to the old asphalt
disperses water quickly off the surface. This reduces roadway
spray from vehicles and provides greater visibility and traction in wet weather. UBAS
has performed well for other cities and has been used to help extend the life of many
roads around the State of Kansas.
APAC, Kansas was the contractor and recently completed approximately 15.2 lane
miles of UBAS placement on City arterial, collector and local streets, including both
asphalt and concrete. UBAS can be placed directly on the existing surface or the
pavement can be milled prior to placing the UBAS to smooth the pavement and to
minimize the build-up of addi tional
material on the roadway. It can be
immediately walked on and driven
across after it is rolled with a steel
drum roller. The UBAS process
includes:
o Streets are swept or blown off
and cleared of debris.
o Material is hauled from the
plant by semi or dump truck
and then dumped into the
shuttle buggy which is
connected to the paver.
o The shuttle buggy continuously
mixes the material keeping it heated.
o The paving machine follows and sprays tack oil onto the road surface as the
material works its way through the shuttle buggy to the paver.
o The UBAS is then placed over the surface at appro ximately 300 degrees
Fahrenheit, adhering to the tack oil.
o A steel drum roller follows behind the paver compacting and smoothing the
roadway.
Enclosed are other items on the agenda. If any Commissioner has questions or cannot
attend the meeting, please contact me.
Jason A. Gage, City Manager