Product Overview

Summary: This Safe Operating Procedure sets out safe, consistent methods for producing high‑quality exposed aggregate concrete finishes on Australian construction sites. It balances technical finishing techniques with robust WHS controls, helping you deliver architecturally attractive surfaces while protecting workers from chemical, silica dust, and equipment‑related risks.

Exposed aggregate finishes are widely used across Australian residential, commercial and civil projects for driveways, pathways, pool surrounds and decorative slabs. Achieving a consistent, durable and slip‑resistant finish requires more than technical skill with a hose or surface retarder – it demands a controlled process that manages timing, weather, equipment, and worker safety from pour to final wash‑off. This SOP provides a structured, step‑by‑step method for planning, placing, exposing and curing concrete with exposed aggregate, tailored to typical Australian site conditions and WHS expectations.

The procedure integrates safe work practices into every stage of the finishing process, including handling chemical surface retarders, controlling slurry and run‑off, managing silica‑bearing dust during mechanical exposure, and working around pumps, vibrators and high‑pressure water. By adopting this SOP, businesses can reduce rework and defects, minimise the risk of slips, trips and chemical exposure, and demonstrate due diligence under Australian WHS law. It supports supervisors and workers with clear responsibilities, inspection checklists and acceptance criteria, ensuring exposed aggregate work is safe, repeatable and aligned with client specifications and relevant standards.

Key Benefits

• Ensure consistent, high‑quality exposed aggregate finishes that meet architectural and client specifications.
• Reduce safety incidents related to chemical retarders, high‑pressure water, silica dust and manual handling during finishing operations.
• Demonstrate compliance with Australian WHS legislation and relevant concrete and slip‑resistance standards.
• Streamline training and onboarding for concreters and apprentices with a clear, step‑by‑step method statement.
• Minimise costly rework, surface defects and project delays caused by inconsistent exposure timing or poor curing practices.

Who is this for?

• Concrete Finishers
• Formworkers
• Site Supervisors
• Construction Project Managers
• WHS Advisors and Safety Officers
• Landscaping Contractors
• Civil Construction Supervisors
• Apprentice Concreters and Trainees

Hazards Addressed

• Exposure to chemical surface retarders and concrete additives (skin and eye irritation, inhalation risks)
• Silica dust generation during mechanical exposure, grinding or cutting of hardened concrete
• High‑pressure water injuries and flying debris during wash‑off and cleaning
• Slips, trips and falls on wet, uneven or slurry‑covered surfaces
• Manual handling injuries from moving screeds, hoses, tools and formwork around exposed aggregate areas
• Contact dermatitis and cement burns from wet concrete and slurry
• Noise and vibration from mechanical surface treatments and cutting equipment
• Environmental contamination from uncontrolled slurry, wash‑water and chemical run‑off

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Terminology (Exposed Aggregate, Surface Retarder, Wash‑Off, Slurry Management)
• 3.0 Roles and Responsibilities (Supervisors, Concreters, Apprentices, WHS Personnel)
• 4.0 Applicable Legislation, Standards and Codes of Practice
• 5.0 Required Competencies, Licensing and Training
• 6.0 Tools, Plant, Materials and Personal Protective Equipment (PPE)
• 7.0 Pre‑Start Planning and Site Assessment (Weather, Access, Drainage, Environmental Controls)
• 8.0 Hazard Identification and Risk Controls for Exposed Aggregate Work
• 9.0 Concrete Placement and Initial Finishing Requirements for Exposed Aggregate
• 10.0 Application of Surface Retarders and Chemical Handling Procedures
• 11.0 Timing, Inspection and Testing Prior to Exposure
• 12.0 Safe Techniques for Aggregate Exposure (Water Wash‑Off, Brushing, Mechanical Methods)
• 13.0 Slurry, Run‑Off and Environmental Management Controls
• 14.0 Surface Quality Criteria and Defect Management (Uniformity, Stone Exposure, Slip Resistance)
• 15.0 Curing, Sealing and Post‑Treatment Requirements
• 16.0 Housekeeping, Waste Disposal and Site Restoration
• 17.0 Emergency Procedures (Chemical Exposure, High‑Pressure Injuries, Eye Contamination)
• 18.0 Monitoring, Review and Continuous Improvement of the Procedure
• 19.0 Documentation, Records and Sign‑Off Forms
• 20.0 Toolbox Talk and Training Aids (Checklists and Pre‑Start Briefing Template)

Legislation & References

• Model Work Health and Safety Act and Regulations (as implemented in each Australian state and territory)
• Safe Work Australia – Code of Practice: Managing the Risk of Hazardous Chemicals in the Workplace
• Safe Work Australia – Code of Practice: Managing the Risks of Respirable Crystalline Silica from Engineered Stone in the Workplace (principles applied to concrete work)
• AS 3600: Concrete structures
• AS 1379: Specification and supply of concrete
• AS 4586: Slip resistance classification of new pedestrian surface materials
• AS/NZS 1715: Selection, use and maintenance of respiratory protective equipment
• AS/NZS 2161 series: Occupational protective gloves
• AS/NZS 4501 series: Occupational protective clothing
• AS/NZS 4801 or ISO 45001: Occupational health and safety management systems