Waterproofing of Bridge Decks The Latest Technique and Material

Pratap Singh Rautela, Nile Waterproofing Materials, Co. S.A.E. company Noida.

Bridges are important infrastructure facilities connecting different areas and allowing smooth movement of men, material and machinery from one place to another. Roads have no purpose unless bridges are provided for crossing rivers. Railway lines (ROB), highways (Flyovers) etc. Early deterioration of cement concrete bridge structures resulting into weakness or even part collapses disturb the movement of traffic and has serious impact over social and financial status of the local society. Minor causes like leakage and seepage of water or deicing salt solution into even the slightly permeable deck concrete surface result into corrosion of reinforcing steel which result into spalling, cracking and loss of section of structure.

The problem can be solved to a great extent if concrete surface is protected against ingress of moisture and salts. In other words, if a protection layer is introduced over the bridge deck concrete surface in form of a dependable water proofing system.

Bridge Decks: Waterproofing Choice

waterproofing latest technique
The waterproofing of bridge decks is recognized in many European countries as a vital and necessary operation to enhance the durability and longevity of the life of bridge.

It represents the first line of defense and prevents the ingress of water, road de-icing salts, and aggressive chemicals which would corrode the steel reinforcing bars in the concrete causing severe structural damages.

Some countries with mainly warm weather and dry climates choose not to waterproof their bridge decks but, a recent analysis in the USA showed that 200,000 Bridge decks are seriously suffering from corrosion resulting in direct cost of $2 billion for replacement and refurbishment.

Concrete will always have some degree of porosity and allied with surface wear and hair line cracking, will allow water and corrosive materials to penetrate and attack the steel reinforcement. The primary defense against such destructive agents is good dense concrete, along with a proven waterproofing system installed by a qualified contractor.

Bridge Deck Waterproofing Systems

Two types of Bridge deck waterproofing systems are available for use:
  1. Sheet Systems These are Polymer Modified Bituminous sheets bonded to the bridge deck, using torch application, hot mopping asphalt, or through self-adhesion. Manufacturers have developed various systems that would satisfy the enhanced requirements of the bridge deck waterproofing market.
  2. Liquid (Sprayed) Systems These systems largely fall into acrylics and Polyurethanes and normally consist of three elements. Primer, Membrane applied in one or two coats and tack coat specially developed to enhance the bond of the membrane to the surfacing mix.

Performance Requirements for the System

Independent of the bridge deck waterproofing system choice, certain performance criteria has to be met in order to avoid potential concerns regarding leakage, poor bonding, embrittlement or softening of the membrane in service.

Such performance criteria are:
  • Impermeability to water under all conditions
  • Good adhesion to deck
  • Good adhesion to surfacing.
  • Capable of bridging shrinkage cracks in concrete
  • High mechanical properties to handle traffic loads including shear forces in curves and during braking and accelerating
  • Tolerant of deck texture and details
  • Tough to withstand site damage and operation
  • Safe to apply
  • Able to withstand elevated surface temperatures
  • Can be applied over a wide range o f ambient conditions
  • Nonegradable

Proper Site Practice the key Success

The success of bridge deck waterproofing operation is often reliant on site procedures, workmanship and weather conditions.
  • Professional preparation is as important as the properties of material or system to be used. Before the work commences at site the following major issues need be addressed:
  • Availability of properly trained workforce and qualified supervisors
  • Site engineer must have design detailing and construction records accessible
  • Provision of adequate strong area for material to be used
  • A Safe access to bridge deck must be secured for personnel, equipment and materials
  • Established method of statement, and execution program discussed and approved by all parties
  • Review of weather conditions likely to affect the waterproofing operation
  • Preparation of concrete deck to meet strict surface finish requirements (Sound, even, uncontaminated, dry, dust free). Thereby offering optimum opportunity for a strong bond to waterproofing membrane.
  • Use of an appropriate primer
  • Choice and application of a waterproofing system approved and in compliance with Highway Agency Standards.
  • Adequate protection of the waterproofing membrane prior to the application of the asphalt road surfacing
  • Use of approved asphalt road surfacing with low void content mix design

Bitunil Bridge Deck Waterproofing System

BITUNIL Bridge Deck Waterproofing System consists of two layers of fully torch welded heavy duty APP modified bitumen membranes with composite polyester reinforcement, applied on a primed substrate.

System Application:
  • Concrete surface must have a minimum acceptable gradient to ensure water drainage on the surface of the asphalt pavement.
  • A primer coat must be applied to concrete deck to seal the voids, promote W.P. adhesion, and assure against blister formation.
  • Prior to membrane application, a reinforcing MBM strip shall be applied to cover all intersections with edge beams.
  • Waterproofing Membrane shall be applied fully bonded to bridge deck, parallel to down slope direction. Side laps and end laps shall be 8-12 cm, and 12-15 cm respectively.
  • Second waterproofing layer shall be applied fully bonded onto the first layer, at the same direction of rolls length, with shifting the side laps 0.5 meter in order to secure the membrane waterproofing system with maximum overlaps.
  • Flashings must extend min. of 10 cm up against the edge beams.
  • Waterproofing must be protected against sunlight until asphalt layers, of drainage, protective and wear courses are applied. It is recommended to apply the asphalt layers as soon as possible.
  • Thickness and mix design of asphalt courses are as per consultant and project specifications.
  • Bridge deck joints must be filled up (Grouted) and covered with 200 mm
  • MBM cover strip prior to membrane application.
  • Bitunil System recommendation is for two layers of MBM fully torch welded onto deck surface however, for bridges with low daily traffic (ADT<2000), without significant importance to local and regional traffic, and without frequent breaking and turning traffic, a single layer system is adequately sufficient.
The wonder product from the Nile Waterproofing Materials Company S.A.E., BITUNIL, is the product of experience, prudence and knowledge. The Bitunil plant is built over an area of 20,000 square meters in Al Max Alexandria Port. The production plant is state-of the- art for manufacturing of modified bitumen membranes, and is fully equipped to manufacture quality products that comply with most of the internationally recognized standards.

Bitunil manufactures and market large types of waterproofing systems to suit different requirements of Engineering industry to mention few of those are BITUBOND–4, BITUBOND 4/E, NILOBIT-PM, NILOBIT-PM-MINERAL NILOBIT-F, BITY FLEX 4 & 4E, BITUPLAST 4 & 4/E, BITUGARDEN 4- 4E & M BITUTER 4 & 4E, BITUGUM MINERAL, NILOBIT-PN, NILOBIT-PM.

The company has achieved great reputation for its products and services it offers to its clients. The products are being used in almost all corners of the world due to their high quality, reliability, uniformity in Quality and successful performance.

Bridge Joints: Selection and Water Management

Based on the predicted movement related to imposed design loads, and temperature variation ranges, the bridge designer specifies the appropriate bridge joints. Selection can vary from a wide range of pre-fabricated expansion joints, to cast in place Asphaltic plug joints. The drainage system for the joint should ideally overlap the deck waterproofing system used. Combined subsurface drainage outlets serve to discharge water and prevent build-up behind the joint. Regular inspection of surfacing and joints is necessary to maintain satisfactory performance throughout bridge service life. Early fault detection, such as blocked drainage or damaged surfacing, is necessary to avoid major remedial work. Inspection and maintenance should be scheduled to coincide with other bridge maintenance work to reduce disruption and consequential costs.

NBMCW January 2008

Click Here
To Know More / Contact The Manufacturer
Please provide your details we will contact you as soon as possible
Please let us know your name.
Invalid Input
Please let us know your Designation.
Invalid Input
Please let us know your City.
Please let us know your State.
Please let us know your Country.
Please let us know your Contact Number.
Please let us know your email address.
Please brief your query.

Buildtech: Pragmatic Approach to the Methodology of Retrofitting Buildings

With the increase in construction of buildings in the last two decades, it has been observed that many of the structures are already showing signs of distress. In some cases, repair measures become necessary even within a span Read More ...

Pure Leathers Waterproofing Solutions for Tunnels, Roofs, Water bodies…

There are various types of Waterproofing Systems available for different applications. Based on its vast experience in waterproofing, Pure Leathers Pvt. Ltd. (PLPL) recommends the most suitable waterproofing systems for various site requirements Read More ...

This monsoon, insure strength for your building with waterproofing & repair solutions from Chowgule

Over a period of time, a building goes through severe climatic changes leading to its ageing, thereby creating loopholes and leakages. A leakage deteriorates the quality of the building, since the water through the affected area, also flows to other Read More ...

STP: Waterproofing & Construction Chemicals

The concept of liquid waterproofing has existed since the early 1800s, when natural bitumen was combined with jute, straw, rag felt and other man made materials to provide a waterproofing solution. Apart from liquid waterproofing membranes Read More ...

Atul: Epoxy & PU solutions for terrace waterproofing with 7-year performance warranty

Water is good while constructing a building, but not so well after the concrete is set. Rain water starts penetrating through the porous concrete in walls and ceiling, creating ugly images of peel-off paints, cracks, damp walls filled with deadly Read More ...

Tremco: Solutions For Problematic Leaking Podiums Latest Technological Advances

India is seeing a spurt in urbanization. As we continue to build bigger, faster and taller, reinforced concrete is the choicest of materials to meet the needs of speed and durability. If we understand concrete simplistically, it consists of the aggregate Read More ...

Long lasting waterproofing solution with Epoxy and PU

Atul Ltd's Lapox® epoxy range of adhesives find the largest application in the construction sector. Products include Lapox® Lacrete and Lapox® Procoat for terrace waterproofing; Ultrafix for vertical cladding Read More ...

Repair & Rehabilitation: STP Ltd

STP provides Waterproofing & Protective Coating solutions for all areas. The range of waterproofing coats consists ShaliRust Off, ShaliPrime ZnR, ShaliBond concrete, Shalifix EM, ShaliGrout EI, ShaliFix RM Read More ...

The Raincoat Advantage

In heavy monsoons, would you be caught wearing a torn canvas jacket? Of course not, what a ridiculous question! You would wear a raincoat. So why not extend the same logic to the building structures Read More ...

Roads & Bridges: Repairing, Waterproofing & Asset Management

Waterproofing Technology is continuously progressing. In this context, several important concepts are illustrated which are of use to technology planners and forecasters. STP Ltd has one of the biggest Read More ...

STP offers Green and Cost-Effective Solutions for Road Construction & Maintenance

Fiscal year 2016-17 started with big reforms and multi-dimensional growth-oriented measures like budget allocation for infrastructure developments, over 10,000 km of roads, waterways, railways, and Read More ...

Black Bond Seal Black Concentrated Resin for Multiple Applications

Bond Seal India Pvt. Ltd. is meeting the demand in the construction industry for protection, maintenance and restoration by offering the right solutions and quality products, and innovating for the future Read More ...

Trelleborg launches Rotary Seal for equipment working under high pressure

Trelleborg Sealing Solutions
Trelleborg’s Turcon® Roto Glyd Ring® V rotary seal is designed for equip to work under high pressure without compromising the sealing performance. Trelleborg Sealing Solutions launched an innovative Read More ...

Polygomma™ EPDM Waterproofing Membranes for various areas of building

Polygomma
EPDM Waterproofing Membranes by Polygomma™ are easy to install and can be used on various areas of a building including basements, podiums/landscape areas, roofs/terraces, wet areas Read More ...

Buildtech offers high quality Liquid Waterproofing Membranes

Buildtech
BUILDTHENE IC-Polyurethane-based & BUILDCOTE EC 20-Acrylic Polymer-based Liquid Membranes are the two new waterproofing products by Buildtech. Buildtech is a trailblazer in the Construction Chemicals Read More ...

STP’s Waterproofing & Coloring Solutions for Roads & Bridges

Shali Seal RSTC Elevated Roads
STP's waterproofing soultions include ShaliSeal RSTC, SuperThermoLay APP membrane, ShaliSeal CSS, ShaliPatch, ShaliPatch EC, to be used on Roads & Bridges. Waterproofing Technology is continuously Read More ...
NBM&CW

New Building Material & Construction World

New Building Material & Construction World
MGS Architecture

Modern Green Structures & Architecture

Modern Green Structures & Architecture
L&ST

Lifting & Specialized Transport

Lifting & Specialized Transport
II&TW

Indian Infrastructure & Tenders Week

Indian Infrastructure & Tenders Week