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FRM WaterProof Asphalt Concrete

Overview

  • FRM waterproof asphalt concrete is a non-permeable paving material with waterproofing properties, which can be applied to bridges and underpasses without a waterproof layer.
  • It has been tested and verified for its water penetration blocking effect and durability.
  • FRM waterproof asphalt, with appropriate particle-size distribution, optimal asphalt content, filler usage, and a large amount of waterproof additives (composed of asphalt modifiers, fine fillers, adhesives, etc.), increases the lifespan of the pavement.
  • It is a non-permeable paving material with a porosity of 2% or less.A3

Features

1. Mixing characteristics

  • Among the special additives, fine fillers fill the fine pores of the mixture.
  • The combination of cellulose fibers, elastic materials, and modifiers (PG82-22 or higher) enhances the workability and durability of the mixture.
  • Elastic materials enhance the resistance to vibrations in bridges.
  • Asphalt modifiers increase the viscosity of the asphalt and enhance its adhesion.

2 Mixing conditions

  • Appropriate particle-size distribution of aggregates : Minimizing porosity
  • Use of filler at least 7% : Reduction of porosity
  • Use of at least 6.5% asphalt : Optimization of particle-size distribution, Porosity management
  • Use of modified waterproof additives with a PG82-22 rating or higher : Composed of fine fillers, elastic materials, and mediators
  • Porosity of 2% or less : Impermeable layer (For surface layers, porosity is 2~4%)

3. Application

  • For deck waterproofing (concrete slabs, steel decks), elevated bridges, underpasses, and a middle layer for low-noise pavements

4. Tack coat

  • Rubber-modified emulsified asphalt must be used for tack coat application.
  • Joint areas in the structure should be sprayed twice. (Absorption layer + Bonding layer)
  • In case of using normal emulsified asphalt, it may cause re‐emulsify upon contact with water and reduce the durability of the pavement.

Comparison of bridge surface paving methods

Comparison of bridge surface paving methods
Normal asphalt concrete FRM Waterproof asphalt concrete
Cross sectional drawing
Waterproof layer Additional waterproofing layer is required. Additional waterproofing layer is not required.
Durability PG64-22 ~ PG76-22
  • - PG82-22 ~ PG82-28
  • - Increased durability by using high PG modified asphalt
  • - Excellent resistance to plastic deformation and cracking
Functionalitty
  • - Permeability test result : No permeability
  • - Waterproofing effect through the installation of a waterproofing layer (Thickness of the waterproofing layer T = 2~3mm)
  • - Permeability test result : No permeability
  • - The pavement itself acts as the waterproofing layer. (Thickness of the waterproofing layer T = 8~10cm)
Constructability
  • - Slow pavement speed (Waterproofing layer installation time + Asphalt paving time)
  • - Fast pavement speed (Waterproofing layer installation time + Asphalt paving time)
Cost-effectivenss
  • - Additional coasts incurred due to the installation of a waterproofing layer.
  • - Coast savings possible by not installing a waterproofing layer.
  • - Excellent durability reduces the maintenance cycle.

Compared to Normal Asphalt Concrete

Compared to Normal Asphalt Concrete
Test items Unit Function Quality Standards
Normal asphalt concrete FRM Waterproof asphalt concrete
Marshall stability N Strength and durability 6,000 or more 6,000 or more
Porosity % Water tightness 3~6 Under 2
Permeability coefficient cm/sec Water permeability - No permeability
Indirect tensile strength N/mm2 Crack resistance 0.8 or more 0.9 or more
Dynamic stability time/mm Plastic deformation resistance 1,000 or more 2,000 or more
Cantabro loss (20℃) % Resistance to aggregate spalling - Under 15
Skid resistance BPN Slip resistance - 60 or more

Construction Site

Dongducheon-si
Yongin-si, Suji-gu
Gwonseon District, Suwon-si
Asan-si

Applications

Bridges

  • Structural drawing

Underpass and Overpass

  • Structural drawing

Treatment of Joint Sections (Cold Joint)

During tack coat application after waterproof asphalt pavement, a sufficient amount of rubber-modified emulsified asphalt should be sprayed to the cold joint. (Enough to flow on the surface)

How to Repair

  1. ① After cutting to the lower layer, apply rubber emulsion.
  2. ② Load ton-bag waterproof asphalt concrete into the Mobile Asphalt Production Facility, then heat and mix.
  3. ③ Lay the mixture in the repair area and compact using a compactor or roller (Lower layer).
  4. ④ Apply a sufficient amount of rubber emulsion on the lower pavement surface to prevent water infiltration.
  5. ⑤ In accordance wit the type of surface layer (Waterproof, Modified, Low-noise), load the ton-bag asphalt concrete into the facility.
  6. ⑥ Heat, and mix.
  7. ⑦ Lay the mixture in the repair area and compact using a compactor or roller (Upper layer).
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