Resurfacing of Cast-in-Place Concrete AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Resurfacing of Cast-in-Place Concrete AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew resurfacing cast-in-place concrete safe from surface-preparation dust and silica, from the overlay material and chemicals, and through the surface condition and bond. Resurfacing of cast-in-place concrete prepares and applies a new surface layer to existing concrete — combining the surface-preparation-dust and silica hazard, the overlay-material and chemical hazard, and the surface-condition and bond hazard. This guide walks through building a Resurfacing of Cast-in-Place Concrete AHA that names the surface-preparation-dust/silica, overlay-material/chemical, and surface-condition/bond hazards and assigns the dust, material, and bond controls that hold up in the field.
Why resurfacing of cast-in-place concrete needs its own AHA
Resurfacing of cast-in-place concrete is the renewal of the surface of existing cast-in-place concrete — grinding, scarifying, or shot-blasting to prepare the surface, then applying an overlay, topping, or resurfacing material to restore or renew the concrete surface. The defining feature is that the surface preparation generates significant silica dust (from grinding/scarifying concrete) and the resurfacing materials carry chemical hazards, with the surface condition and bond determining success. The hazards combine the surface-preparation-dust and silica (preparing the surface by grinding, scarifying, or shot-blasting — the respirable silica dust hazard (mechanical surface preparation of concrete generates crystalline silica) and the equipment (grinders, scarifiers, shot-blasters)), the overlay-material and chemical (the resurfacing/overlay materials (cementitious overlays, epoxy/polymer toppings) — chemical hazards (skin/eye/respiratory from the materials, especially polymer/epoxy)), the surface-condition and bond (the existing surface condition and the bond of the overlay — inadequate preparation/bond fails, and the surface may hide defects/hazards), and the ergonomic/access. The surface- preparation-dust/silica and the overlay-material/chemical justify a dedicated AHA.
Breaking resurfacing of cast-in-place concrete into steps
The steps for a Resurfacing of Cast-in-Place Concrete AHA follow the resurfacing:
- Assess the existing surface condition
- Prepare the surface (grinding/scarifying — silica control)
- Manage the silica dust from surface preparation
- Mix/prepare the overlay material (chemical controls)
- Apply the overlay/resurfacing material (bond)
- Manage the dust, chemical, and bond hazards
- Cure/finish the resurfaced concrete
- Complete
Each step carries a hazard, and the surface-preparation-dust/silica, the overlay-material/chemical, and the surface-condition/bond are where the most significant risks concentrate.
The hazards step by step
Surface-preparation-dust and silica
Preparing the surface by grinding, scarifying, or shot-blasting — the respirable silica dust hazard (mechanical surface preparation of concrete generates crystalline silica) and the equipment (grinders, scarifiers, shot- blasters). The controls are silica-dust control (water/wet methods or HEPA dust collection on the grinders/ scarifiers/shot-blasters — engineering controls per the silica standard, respiratory protection), safe surface-prep equipment operation, and the dust/silica controls. The surface-preparation-dust/silica is the primary defining hazard — mechanical concrete surface prep generates respirable silica. (These follow the silica and surface-preparation fundamentals.)
Overlay-material and chemical
The resurfacing/overlay materials (cementitious overlays, epoxy/polymer toppings) — chemical hazards (skin/eye/ respiratory from the materials, especially polymer/epoxy). The controls are the chemical controls for the overlay material (skin/eye protection for cementitious materials (caustic) and polymer/epoxy resins (sensitizers/ irritants), respiratory protection where warranted, ventilation for solvent/polymer fumes, per the SDS), and the overlay/chemical controls. The overlay-material/chemical is a defining hazard — the overlay materials carry chemical hazards. (These follow the chemical-handling fundamentals.)
Surface-condition and bond
The existing surface condition and the bond of the overlay — inadequate preparation/bond fails, and the surface may hide defects/hazards. The controls are assessing the existing surface (condition, contamination, defects — which may include hazardous coatings/materials to address first), adequate surface preparation for the bond (clean, sound, profiled surface — the resurfacing quality/bond depends on it), and the surface/bond controls. The surface-condition/bond is a defining function — the surface condition and preparation determine the bond. (These follow the surface-preparation fundamentals.)
Ergonomic/access
The ergonomic and access (surface-prep equipment handling, working on the surface — often floors, bending) carries the ergonomic hazard. The controls are managing the ergonomics (equipment handling, floor work) and safe access, and the ergonomic controls. (These follow the ergonomic fundamentals.)
A simple Resurfacing of Cast-in-Place Concrete AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Assess | Surface defects | Assess the existing surface condition | project |
| Prepare | Silica dust | Prepare surface (grind/scarify) with silica control | OSHA 1926.1153 |
| Manage dust | Silica | Water/HEPA dust control, respiratory protection | OSHA 1926.1153 |
| Mix overlay | Chemical | Mix/prepare overlay material (chemical controls) | project |
| Apply | Bond failure | Apply overlay to prepared surface (bond) | project |
| Cure/finish | Surface | Cure/finish the resurfaced concrete | project |
Silica-dust control and overlay-chemical/bond management
A Resurfacing of Cast-in-Place Concrete AHA centers on silica-dust control and overlay-chemical/bond management. The silica-dust control addresses the respirable silica from surface preparation — controlled by silica-dust control (water/wet methods or HEPA dust collection on the grinders/scarifiers/shot-blasters, respiratory protection) and safe surface-prep equipment operation. The overlay-chemical/bond management addresses the overlay materials and the bond — controlled by the chemical controls for the overlay material (skin/eye/respiratory protection for cementitious and polymer/epoxy materials, ventilation) and adequate surface preparation for the bond (clean, sound, profiled surface). And the equipment handling gets ergonomic controls. An AHA built on silica-dust control and overlay-chemical/bond management, with ergonomic controls, addresses the hazards that define resurfacing of cast-in-place concrete.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, resurfacing of cast-in-place concrete renews the surface of existing concrete, and its defining hazard is the silica dust from preparing the surface, alongside the chemical hazards of the overlay materials. The surface-preparation-dust and silica hazard is the primary defining concern — resurfacing requires preparing the existing concrete surface by grinding, scarifying, or shot-blasting to create a clean, sound, profiled surface for the overlay to bond to, and all of these mechanical surface-preparation methods generate respirable crystalline silica from the concrete, which is a serious respiratory hazard (silicosis, lung cancer). So silica-dust control is essential and is specifically addressed by the silica standard's engineering controls: water/wet methods or HEPA dust collection integrated into the grinders, scarifiers, and shot-blasters (these tools have dust-control attachments for exactly this reason), along with respiratory protection. Concrete surface prep is one of the highest silica-generating activities, so the engineering dust controls on the equipment are central.
The overlay-material/chemical and the surface-condition/bond are the other defining hazards. On the projects I have run, the resurfacing and overlay materials carry chemical hazards: cementitious overlays are caustic (skin and eye hazard, like all cement products), and polymer and epoxy toppings contain resins that are skin sensitizers and irritants and may have solvent or fume hazards, so the chemical controls for the specific overlay material (skin and eye protection, respiratory protection and ventilation where warranted, per the SDS) are the controls. And the surface-condition/bond hazard is both a quality and a safety point: the existing surface must be assessed (its condition, contamination, and defects — and importantly, the assessment may reveal hazardous coatings or materials on the existing surface, like lead paint or other coatings, that must be addressed first using the appropriate abatement controls), and the surface preparation must be adequate for the bond, because a resurfacing that does not bond fails. Assessing what is on the existing surface before grinding into it connects back to the assessment and abatement work. The ergonomic and access hazards (handling the surface-prep equipment, working on floors) round it out. The AHA built on silica-dust control and overlay-chemical/bond management is the one that protects the resurfacing crew.
The bottom line
A Resurfacing of Cast-in-Place Concrete AHA names the surface-preparation-dust/silica, the overlay-material/ chemical, and the surface-condition/bond hazards with specific controls — engineering silica-dust controls (water/ HEPA) on the grinding/scarifying/shot-blasting equipment for the respirable silica, chemical controls for the cementitious and polymer/epoxy overlay materials, and adequate surface assessment and preparation for the bond. The silica-dust control and the overlay-chemical/bond management are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions
Why is silica dust the primary hazard in concrete resurfacing?
Resurfacing requires preparing the existing concrete surface by grinding, scarifying, or shot-blasting, and all of these mechanical surface-preparation methods generate respirable crystalline silica from the concrete — a serious respiratory hazard (silicosis, lung cancer) — making concrete surface prep one of the highest silica-generating activities. Controls are silica-dust control (water/wet methods or HEPA dust collection on the grinders/scarifiers/shot-blasters — engineering controls per the silica standard, respiratory protection), safe surface-prep equipment operation, and the dust/silica controls.
What chemical hazards do the overlay materials carry?
The resurfacing and overlay materials carry chemical hazards: cementitious overlays are caustic (skin and eye hazard), and polymer and epoxy toppings contain resins that are skin sensitizers and irritants and may have solvent or fume hazards. Controls are the chemical controls for the overlay material (skin/eye protection for cementitious and polymer/epoxy materials, respiratory protection where warranted, ventilation for solvent/polymer fumes, per the SDS), and the overlay/chemical controls.
Why assess the existing surface before resurfacing?
The existing surface must be assessed for its condition, contamination, and defects — and importantly, the assessment may reveal hazardous coatings or materials (like lead paint) that must be addressed first — and the surface preparation must be adequate for the bond, because a resurfacing that does not bond fails. Controls are assessing the existing surface (condition, contamination, defects, including hazardous coatings to address first), adequate surface preparation for the bond (clean, sound, profiled surface), and the surface/bond controls.
What is resurfacing of cast-in-place concrete?
Resurfacing of cast-in-place concrete is the renewal of the surface of existing cast-in-place concrete — grinding, scarifying, or shot-blasting to prepare the surface, then applying an overlay, topping, or resurfacing material. Because the surface preparation generates respirable silica, the overlay materials carry chemical hazards, and the surface condition and bond determine success, those hazards apply.
Related AHAs and JHAs
- Selective Demolition for Concrete AHA — related concrete removal
- Concrete Surface Preparation JHA — the surface-preparation fundamentals
- Concrete Surface Grinding JHA — the grinding and silica fundamentals
- Concrete Repair JHA — related concrete repair work
Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.