FRP Strengthening SWMS

Fibre Reinforced Polymer (FRP) strengthening involves bonding carbon, glass or aramid fibre laminates and fabrics to existing concrete structures using two-part epoxy or styrene-based resin systems to increase flexural, shear or axial capacity. The work typically occurs on bridges, car park soffits, beams, columns and slabs requiring upgrade for changed loading or remediation of deteriorated concrete. Under WHS Regulation 2025, this activity is high risk construction work because it involves the use of hazardous chemicals (epoxy amines, styrene monomers) at concentrations capable of causing sensitisation, and frequently occurs at height, in confined spaces, or above operational areas. A documented SWMS is mandatory under WHS Reg 2025 s291 before work commences, must be developed in consultation with workers per s47-49, retained for the duration of the works, and reviewed when controls fail or conditions change. The SWMS must address surface preparation dust, resin chemistry, work-at-height interfaces, and disposal of contaminated consumables.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Where structural objectives permit, specify near-surface mounted (NSM) bars in pre-cut grooves or external post-tensioning to eliminate hand lay-up resin exposure entirely.
2. 2Elimination — Eliminate dry cutting of CFRP on site by ordering laminates pre-cut to drawing dimensions from the supplier, removing dust generation at source.
3. 3Substitution — Substitute styrene-based polyester systems with low-VOC epoxy formulations carrying GHS Category 1 sensitiser warnings only, reducing inhalation WES exposure profile.
4. 4Substitution — Replace abrasive blasting surface preparation with vacuum-shrouded diamond grinding to substitute uncontrolled silica release with captured dust at the tool.
5. 5Engineering — Install H-class HEPA on-tool extraction to all grinders and provide forced-air mechanical ventilation delivering minimum 10 air changes per hour in any enclosed wrap area.
6. 6Engineering — Erect compliant scaffold or MEWP with edge protection per AS/NZS 1576 and AS 2550.10 eliminating reliance on travel-restraint as primary fall control.
7. 7Administrative — Conduct daily pre-start SWMS sign-on, SDS review for each resin component, and atmospheric monitoring log review; rotate workers to limit cumulative resin contact below four hours per shift.
8. 8Administrative — Implement permit-to-work for hot resin mixing zones, exclusion zones below overhead wrapping work, and mandatory health monitoring register per WHS Reg 2025 Schedule 14 for crystalline silica and isocyanate-adjacent chemistries.
9. 9PPE — Issue nitrile chemical gloves (minimum 0.4 mm, EN 374 tested against amine breakthrough), Tyvek coveralls, P2 respirators for silica and AX-P2 cartridges for styrene per AS/NZS 1716.
10. 10PPE — Provide sealed safety eyewear to AS/NZS 1337.1, fall arrest harness to AS/NZS 1891.1 with twin lanyards anchored above the dorsal D-ring, and chemical splash apron during resin decanting.

Applicable Codes of Practice

High-Risk Construction Work triggered

Worked example

On a suburban overpass soffit strengthening package, the leading hand opens the FRP Strengthening SWMS at the 6:30 am pre-start brief beneath the MEWP staging area. Three applicators and one ground hand sign on after the leading hand walks the hazard register aloud — flagging that today's task is wet lay-up of unidirectional carbon fabric using a two-part epoxy with an amine hardener, directly above a closed traffic lane. The team confirms the engineering controls listed: MEWP inspection sticker current, forced-air ventilation fan positioned to push vapour away from the basket, on-tool HEPA extraction fitted to the grinder used for final surface keying, and exclusion barriers under the work zone. The SWMS prompts cartridge selection — AX-P2 for the styrene-adjacent primer and P2 alone for the grinding step — and the leading hand checks each respirator fit-test record against the worker sign-on sheet. Mid-morning, ambient temperature rises to 34 °C and pot life shortens; the applicators stop, reopen the SWMS at the 'during-task adjustment' section, and implement the documented hot-weather control — reducing batch size from 2 kg to 500 g, pre-chilling resin components in an ice slurry, and adding a second mixer to maintain placement rate. The change is recorded on the SWMS amendment page, re-signed by all workers, and photographed for the project file before work resumes.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 3600 — Concrete structures