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NDOR Update to Bridge Membrane and
Asphalt Overlay
§ Asphalt Overlays in 70s
o Used Water Proof Membrane
§ Asphalt Overlays in 70s
o Began as an End-‐Of-‐Life Strategy
o Approximately 50 Bridges had Water
Proof Membrane and Asphalt
Overlay installed (‘73 – ’77)
o 25 were put on new decks
(smooth surface) o 18 are sSll
in service o No Chloride PenetraSon
§ Asphalt Overlays in the ‘90s
o Did Not Use Waterproof Membrane
o Consistently Poor Results o Department
Realiza;on of the Importance of
a Waterproofing Membrane in
conjunc;on with an Asphalt Overlay
on a Bridge Deck
1. Bridges with an exisFng
asphalt overlay, will be
Re-‐Overlaid with Asphalt.
2. Bridges with the life
expectancy of less than 10
years, can get an asphalt
overlay.
3. Waterproof Membrane is a
MUST install with asphalt overlay.
4. NO asphalt patches on
bridge decks.
NDOR’s ExisSng PracSce on Asphalt
Overlay
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§ Compare Overlay OpFons
Overlay type Cost ($/SF) Service
Life (Expected)
Silica Fume $15 25
Asphalt with Membrane $4 10-‐15
Epoxy Polymer Overlay $8 10-‐15
§ Compare Overlay OpFons
Overlay type Deck CondiSon
ProtecSon level
Silica Fume 5 or 6 Poor to
Very Good
Asphalt with Membrane 5 or beXer
Very Good to Excellent
Epoxy Polymer Overlay 7 or beXer
Very Good to Excellent
The importance of deck protecFon:
• With good deck protecFon applied
early in a bridge’s service
life it is possible
the deck can last for the
full lifespan of the bridge.
• Without protecFon we know for
sure that bridge decks will
require major acFon (repairs or
re-‐decking).
§ Asphalt with Membrane
Advantages
Low iniFal cost Short construcFon
Fme Familiar material: easy to
repair small failures.
Flexibility of membrane provides
protecFon for decks with movement
related cracking. Overlay
placed with mainline resurfacing (no
paving interrupFon at bridge)
Membrane can provide protecFon at
joints for bridges with low
movement. Asphalt can be
tapered in lieu of inlay on
bridge-‐only projects
Drawbacks
Hides deck for inspecFon. Can’t
protect deck under open rails
Rail height can limit thickness:
• Need 32” minimum rail height
on Interstate • Need 27”
minimum rail height elsewhere
Preformed membrane is difficult to
install on curved bridges and
bridges with steep super elevaFons.
For these applicaFons use
spray-‐type membrane, (at higher
cost) Need an asphalt plant
§ Overlays and Expansion Joints
There is no perfect joint: all
joints can have problems Joints
in overlays, except asphalt, follow
same rules for Expansion joint
selecFon as on a bare deck:
BOPP 3.1.7 Expansion Device Policy
BOPP Expansion Device Policy doesn’t
currently cover Asphalt Overlay joint
selecFon. SPU pracFce is:
TM < 0.5” no expansion device
required (they are considering
reducing this to TM < 0.25”)
TM between 0.5” and 1.0” use
a 12” to 20” asphalt plug
joint TM > 1.0” use built
up concrete nosing and follow
BOPP 3.1.7
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§ Asphalt Plug Joint
§ Bridge Program on State Highway
System
2 19
20 14 26
10 9
$0M
$10M
$20M
$30M
$40M
$50M
$60M
$70M
$80M
$90M
2016 2017 2018 2019 2020 2021
2022
Other
Culverts
Bridges
§ Asphalt Overlays with Membrane
$0
$500
$1,000
$1,500
$2,000
$2,500
$3,000
2009 2010 2011 2012 2013 2014
2015
Thou
sand
s
Asphalt Membrane
§ Asphalt and Membrane SpecificaSon
EvoluSon
§ 2009-‐2011, 2 pages § Authored by
M&R, SPU § End of Life on
Maintenance Projects § InstallaSon Per
Manufacturer's representaSve and in
accordance with the specificaSons §
Stop Gap Measure
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§ Asphalt and Membrane SpecificaSon
EvoluSon
§ 2011, 4 pages § Authored by
BMS § PreservaSon of Bridge Decks
§ Significant Deck PreparaSon InstrucSons
§ Used 2012 – 2015
§ Asphalt and Membrane SpecificaSon
EvoluSon
§ 2014 (Type A), 8 pages
§ Authored by BMS, M&R,
ConstrucSon § PreservaSon of Bridge
Decks § Significant changes to
ConstrucSon Methods (CSP 5) &
Material ProperSes Table (percent
elongaSon, polymeric thickness)
§ Never Let § Driven by Technological
and Material Property changes in
the Advancing Industry
§ Asphalt and Membrane SpecificaSon
EvoluSon
§ 2015 (Type A), 14 pages §
Authored by BMS, M&R, ConstrucSon
§ PreservaSon of Bridge Decks §
Added OpSon 1 and OpSon 2 deck
preparaSon § 2015 (2/5/15 and
2/26/15 leengs by Addendum), 2015
(7 remaining leengs in contract)
§ OpSon 1 Similar to the
previous version § OpSon 2 allowed
for reduced deck preparaSon but
required a thicker 2 ply membrane
§ Asphalt and Membrane SpecificaSon
EvoluSon
§ 2016 (Type 1), 7 pages §
Authored by BMS, M&R, ConstrucSon
§ PreservaSon of Bridge Decks §
Removed OpSon 2, single pay item
"Preformed
Waterproofing Membrane", used on bridges
with less than 15% deck area
in need of roughness removal
§ 2016 (2/4/16 leeng by Addendum)
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§ Asphalt and Membrane SpecificaSon
EvoluSon
§ 2016 (Type 2), 7 pages §
Authored by BMS, M&R, ConstrucSon
§ PreservaSon of Bridge Decks §
Removed OpSon 2, two pay items
"Preformed
Waterproofing Membrane" and "Bridge Deck
PreparaSon", used on bridges with
more than 15% deck area in
need of roughness removal
§ Never Let (yet)
§ Summary
§ Long History of Bridge Deck
Membrane Use in NE § AnScipate
Increased Use § Asphalt Plug Joints
Use to ConSnue and Increase §
High Quality ExpectaSons § More Than
Willing to Work With the
Industry to
Achieve High Quality Results
§ QuesSons? Comments?