v
Technical Specifications iIFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
ITEM 405.11 - CRACK SEALING
A. SCOPE
The work covered by this section of the specification consists of furnishing all materials, labor,
transportation, and equipment necessary to perform all operations in connection with the
cleaning and sealing of construction and random cracks in bituminous concrete pavements,
including vegetation removal and sterilization of cracks, where necessary.
B. MATERIAL
Crack sealant shall be a modified asphalt-fiber compound designed specifically for improving
the strength and performance of the parent asphalt sealant.
Asphalt Binder
The asphalt binder shall consist of a blend of neat asphalt binder, chemically modified crumb
rubber (CMCR), and a polymer package, all of which meet the following specifications:
- The binder will meet PG 64-28E requirements after modification including:
- PG grade requirements of AASHTO M320
- Requirements of AASHTO TP70/MP19
- Modification, at a minimum, shall consist of 7% crumb rubber, and the maximum particle
size for the recycled tire rubber shall be 80 mesh (#80 sieve)
The asphalt supplier shall provide testing for both the neat and modified asphalt binders
See below for typical modified test results for 64-28E with crumb rubber:
DSR ORIGINAL: kPa>1.00 @ 64° C. Fail temp = 76+° C
DSR RTFO: kPa >2.20 @ 64° C. Fail temp = 76+° C
MSCR: JNR (MSCR unit of measure): 3.2 E <0.5% @ 64° C
R3200 (Average % Recovery): >70%
DSR PAV: kPa <6000 @ 64° C
BBR: Stiffness <300 @ -18° C. M-Value >0.300 @ -18° C
Fiber reinforcing materials shall be short-length polyester fibers having the following properties:
Length* 0.25 in. + 0.02 in.
Elongation at Break (ASTM D2256-90) 35% + 3%
Melting Point (ASTM D3418-82) >475 degrees F (246 degrees C)
Crimps/Inch (ASTM D3937-90) None
Cross Section Round
Denier (ASTM D1577-90) 4.5 Nominal dpf
14
