ITL Aquaseal Remediation Method for existing Concrete Structures

1.
PURPOSE
To outline the method for remediation of concrete structures to provide an impermeable barrier using the ITL Aquaseal System.
2.
SCOPE

For all lining of in situ concrete structures used within water or waste containment and or distribution structures using the ITL Aquaseal System.

If unsure of product and installation please contact ITL prior to remediation of concrete.

3.
PERSONAL PROTECTIVE EQUIPMENT REQUIRED
PERSONAL PROTECTIVE EQUIPMENT REQUIRED
4.
SPECIFIC WORK EQUIPMENT REQUIRED
1. Concrete cleaning and surface abrasive equipment for surface preparation
2. Filler: ITL Polyfill powder and mix/distribution equipment ( from concrete channel instructions )
3. Coating: ITL Aquaseal powder and mix/distribution equipment
4. Water
5. Bucket, mixing implement, brush/roller/trowel
5.
SAFETY INFORMATION

All components are non-hazardous, however the following key safety precautions should be taken:

  • ITL Polyfill and ITL Aquaseal powder contains cement – use P2 mask and glasses/goggles to avoid inhalation and/or contact with mucous membranes
  • Wear gloves for handling of wet ITL Polyfill and or ITL Aquaseal, wash with water if contact made
6.
RECOMMENDED MAINTENANCE
  • The ITL Aquaseal System should be included in a regular visual inspection program to ensure liner integrity
  • For removal of silt and related material, use light rubber tracked vehicles with silt vacuum systems
7.
PROCEDURE FOR REMEDIATION

Prepare section for works

  • Isolate water flow to channel basin or aqueduct section with sandbags etc.,
  • the area is to be cleaned by high-pressure water and or abrasive cleaning equipment, care being taken not to damage the existing substrate;
  • use excavator to remove weed and silt material
  • use vacuum pump to extract remaining weed and silt material and dispose
  • Make sure area around the nominated remediation section is dry, clean and free of loose material;

Repair structural deficiencies

  • check concrete structure for structural integrity
  • apply where required cement mortar were cracks and/or cavities are greater than 25 mm diameter or depth
  • mix and pump cement mortar to affected areas
  • smooth out, brush and make good the surface
  • remove all loose material from within aqueduct structure
  • follow manufacturers recommendations before application of ITL Polyfill

Application of ITL Polyfill

  • mix ITL Polyfill and spray apply as specified
  • apply ITL Polyfill to any cracks and/or cavities less than 25 mm diameter or depth
  • do not allow slumping
  • ensure application is smooth and consistent
  • allow 24 hours prior to application of ITL Aquaseal

Application of ITL Aquaseal

  • mixed ITL Aquaseal and spray applied as specified
  • apply ITL Aquaseal over the entire surface area of the aqueduct to a nominal depth of 2 mm
  • do not apply to a depth greater than 3 to 4 mm to avoid shrink cracking
  • at the top of either side of the aqueduct, apply masking tape to have a uniform line between existing concrete material and ITL Aquaseal coated section
  • if the nominated area is not integrated to a headwall structure, key in a leading-edge to the aqueduct so as to prevent any likelihood of water flow under the ITL Aquaseal coated surface
  • allow 5 to 7 days to cure in normal weather prior to opening to intended use
  • The coated area should be visually inspected to ensure full ITL Aquaseal coverage over the section.
8.
ATTACHED DOCUMENTS

(as a minimum)

  • ITL Aqualiner Coating Specification
  • MSDS for ITL Polyfill
  • MSDS for ITL Aqualiner

This document is available as a pdf also.

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