Pavement Preservation Journal - Fall 2014 - (Page 35)
SAMI to Extend Life of
U.S. 64 in N.C.
IMAGE CREDIT: HAMMAKER EAST LTD.
n May, specialty contractor
Hammaker East Ltd. completed
the longest stretch of road with
a proprietary stress absorbing
membrane interlayer (SAMI) in North
Carolina, U.S. 64 in Nash County, N.C.
The crack-resistant SAMI-
FiberMat by Colas Solutions, Inc.-is
a specially formulated, polymer
membrane binder for use with chip
seal applications or as an interlayer
with various overlays (e.g. HMA,
slurry surfacings or micro surfacing).
FiberMat provides strength and
flexibility due to the utilization of
chopped fiberglass strands that
form a high-tensile strength matrix.
The system is installed by a truckmounted machine that uniformly
applies the fiberglass strands-cut
from onboard spools-in a random,
In placement, the strands are
sandwiched between two layers of
sprayed latex polymer-modified CRS
emulsion, prior to the application
of an aggregate cover. Much like
a conventional chip seal, the final
product then is gently rolled with
rubber-tired compactors to seat the
aggregate into the product. The
combination of highly modified
asphalt residue and a fiberglass
reinforcement matrix creates a crackresistant membrane that can stand up
to heavy traffic loadings.
FiberMat delays crack propagation
by dissipating traffic stresses
horizontally through the fibers rather
than vertically through the wearing
course. The application is quick,
providing traffic-ready roads within
The Nash County segment is
the longest section of road in North
Carolina treated with this technology.
Stress-absorbing membrane interlayer (SAMI) is placed on U.S. 68 in Nash County, N.C.
The approximate eight-mile stretch of
roadway joins the town of Nashville
to U.S. 98.
The U.S. 64 Nash County project
used the Type B, SAMI installation
system that serves as an intermediate
layer between the existing pavement
and a new wearing course overlay.
Additionally, the project included
testing a stretch of un-milled roadway
treated with FiberMat. Road repair on
U.S. 64 was completed May 9.
"FiberMat is a great alternative
to traditional resurfacing methods,
especially when the original roadway
is concrete," said Sid Witmer, director
of sales and marketing for Hammaker
East. "Essentially, FiberMat creates a
bonding membrane of layers of oil,
chopped glass fibers and more oil
which is applied to the cracks. Then,
we add a hot mix that absorbs the oil
and keeps the reflective cracks from
returning thanks to the fiber barrier."
"No one wants to resurface a
road they know will experience
cracking within 12 to 24 months," said
Matt Johnson, president of Russell
Standard/Hammaker East. "FiberMat
delays cracking for years, which
eliminates the cost of remobilizing road
construction crews and investing in
more materials for at least one to three
additional times, which ultimately
delivers a long-term cost savings."
Edited by Pavement Preservation Journal
from copy contributed by Hammaker East
pavement preservation journal 35 PM
Table of Contents for the Digital Edition of Pavement Preservation Journal - Fall 2014
Fp2: Costs of Ada Unfunded Mandate Will Hammer Local Road Budgets
Analysis Reveals Benefits of Road Preservation Timing
NCAT Plans to Expand Preservation Research in 2015 Research Cycle
Selecting the Right Treatment for the Right Road at the Right Time
Cold in-Place Recycling Preserves County Road
CIR Solves West Virginia Pavement Predicament
PPRS Paris 2015: Time to Act Is Now
SAMI to Extend Life of U.s. 64 in N.c.
Texas Center Studies Accelerated Asphalt Sealant Curing Methods
Southeast Partnership Hears Ada Requirements
Index of Advertisers
‘Forecaster’ Guides Preservation Strategies
Pavement Preservation Journal - Fall 2014