Selective Demolition for Concrete AHA (Activity Hazard Analysis / Job Hazard Analysis)
Updated 2026-06-23
A Selective Demolition for Concrete AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan that keeps the crew performing selective demolition for concrete safe from concrete-breaking silica and noise/vibration, from the embedded reinforcement and utilities, and through the structural stability of the remaining concrete. Selective demolition for concrete removes specific concrete while preserving the rest — combining the concrete-breaking-silica and noise/vibration hazard, the embedded-reinforcement and utility hazard, and the structural-stability of-remaining-concrete hazard. This guide walks through building a Selective Demolition for Concrete AHA that names the concrete-breaking-silica/noise-vibration, embedded-reinforcement/utility, and structural-stability hazards and assigns the silica, embedment, and stability controls that hold up in the field.
Why selective demolition for concrete needs its own AHA
Selective demolition for concrete is the removal of specific portions of cast-in-place or precast concrete — sections of slabs, walls, beams, columns, or foundations — while preserving the adjacent concrete that is to remain, using breaking, sawing, drilling, and controlled removal methods, as part of renovation, modification, or concrete repair. The defining feature is that breaking concrete generates silica dust, noise, and vibration; the concrete contains embedded reinforcement and often embedded utilities; and the selective removal must maintain the stability of the remaining concrete. The hazards combine the concrete-breaking-silica and noise/vibration (breaking, sawing, and drilling concrete — the respirable silica dust, the high noise, and the vibration (handheld breakers)), the embedded-reinforcement and utility (concrete contains embedded reinforcement (rebar) and often embedded utilities (conduit, pipe) — cutting/breaking into embedded reinforcement and striking embedded utilities), the structural-stability of-remaining-concrete (removing concrete selectively must maintain the stability of the remaining concrete structure — removing structural concrete can compromise the structure), and the debris/flying-fragments. The concrete-breaking-silica/noise-vibration and the structural-stability justify a dedicated AHA.
Breaking selective demolition for concrete into steps
The steps for a Selective Demolition for Concrete AHA follow the demolition:
- Engineer the selective removal (what concrete, stability)
- Locate embedded reinforcement and utilities
- Saw-cut the removal boundary (silica control)
- Break/remove the concrete (silica, noise, vibration control)
- Maintain the stability of the remaining concrete
- Manage the silica, embedment, and stability hazards
- Remove the debris
- Complete
Each step carries a hazard, and the concrete-breaking-silica/noise-vibration, the embedded-reinforcement/utility, and the structural-stability are where the most significant risks concentrate.
The hazards step by step
Concrete-breaking-silica and noise/vibration
Breaking, sawing, and drilling concrete — the respirable silica dust, the high noise, and the vibration (handheld breakers). The controls are silica-dust control (water/wet cutting and drilling, dust collection/HEPA on breakers/saws/drills, respiratory protection — breaking concrete is a major silica source), hearing protection (concrete breaking is very loud), vibration management (handheld breakers — hand-arm vibration), and the silica/noise/vibration controls. The concrete-breaking-silica/noise-vibration is the primary defining hazard — breaking concrete generates silica, noise, and vibration. (These follow the silica and concrete-breaking fundamentals.)
Embedded-reinforcement and utility
Concrete contains embedded reinforcement (rebar) and often embedded utilities (conduit, pipe) — cutting/breaking into embedded reinforcement and striking embedded utilities. The controls are locating embedded reinforcement and utilities before cutting/breaking (scanning/GPR to find embedded conduit, pipe, and post-tension tendons — a critical control, because striking a live embedded conduit shocks, and cutting a post-tension tendon is dangerous), cutting reinforcement safely, and the embedment controls. The embedded-reinforcement/utility is a defining hazard — concrete hides embedded reinforcement and utilities. (These follow the concrete-scanning fundamentals.)
Structural-stability of-remaining-concrete
Removing concrete selectively must maintain the stability of the remaining concrete structure — removing structural concrete can compromise the structure. The controls are an engineering evaluation of the selective removal (which concrete is structural, what needs shoring/support before removal), shoring/supporting the remaining structure where required, a removal sequence that maintains stability, and the stability controls. The structural-stability is a defining hazard — removing structural concrete can compromise the remaining structure. (These follow the structural-demolition fundamentals.)
Debris/flying-fragments
The debris and flying fragments (concrete debris, flying fragments from breaking) carries the debris hazard. The controls are eye/face protection (flying concrete fragments), managing the debris, exclusion, and the debris controls. (These follow the flying-fragment fundamentals.)
A simple Selective Demolition for Concrete AHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Engineer | Instability | Engineer selective removal (what concrete, stability) | project |
| Locate embedments | Strike | Locate embedded reinforcement and utilities (scan/GPR) | project |
| Saw-cut | Silica | Saw-cut removal boundary with silica control | OSHA 1926.1153 |
| Break/remove | Silica / noise | Break/remove with silica, noise, vibration control | OSHA 1926.1153 |
| Maintain stability | Compromise | Maintain stability of remaining concrete, shore | project |
| Remove debris | Flying fragments | Eye/face protection, manage debris | OSHA 1926.102 |
Silica/noise control and embedment/stability management
A Selective Demolition for Concrete AHA centers on silica/noise control and embedment/stability management. The silica/noise control addresses the dust, noise, and vibration from breaking concrete — controlled by silica-dust control (water/wet cutting and drilling, dust collection/HEPA on breakers/saws/drills, respiratory protection), hearing protection, and vibration management. The embedment/stability management addresses the embedded reinforcement/utilities and the remaining structure — controlled by locating embedded reinforcement and utilities before cutting/breaking (scanning/GPR), and an engineering evaluation with shoring for the selective removal to maintain the stability of the remaining concrete. And the debris gets eye/face and exclusion controls. An AHA built on silica/noise control and embedment/stability management, with debris controls, addresses the hazards that define selective demolition for concrete.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, selective demolition for concrete removes specific concrete while preserving the rest, and it combines the classic concrete-breaking hazards (silica, noise, vibration) with two concrete-specific concerns: what is embedded in the concrete, and the stability of the concrete that remains. The concrete-breaking-silica and noise/vibration hazard is the primary defining concern — breaking, sawing, and drilling concrete generates respirable crystalline silica (a serious respiratory hazard), very high noise (concrete breaking is among the loudest construction activities), and hand-arm vibration (from handheld breakers). So silica-dust control (water/wet methods for cutting and drilling, dust collection or HEPA on the breakers, saws, and drills, and respiratory protection — breaking concrete is a major silica source), hearing protection, and vibration management are the controls. These are the standard concrete-breaking controls, and they are central because the dust and noise are severe.
The embedded-reinforcement/utility and the structural-stability are the other defining hazards, and they are where concrete demolition differs from generic breaking. On the projects I have run, concrete is not solid stone — it contains embedded reinforcement (rebar) and very often embedded utilities (electrical conduit, pipe) and sometimes post-tension tendons, so cutting or breaking into concrete can mean cutting into a live embedded electrical conduit (shock), striking an embedded pipe, or — dangerously — cutting a post-tension tendon (which stores enormous energy and can release violently). So locating the embedded reinforcement and utilities before cutting or breaking (concrete scanning or GPR to find embedded conduit, pipe, and post-tension tendons) is a critical control, along with cutting the reinforcement safely. You have to know what is inside the concrete before you cut into it. And the structural-stability hazard is that selectively removing concrete must maintain the stability of the remaining concrete structure — removing structural concrete (a section of a load-bearing beam, column, or slab) can compromise the structure — so an engineering evaluation of which concrete is structural, shoring or supporting the remaining structure where required, and a removal sequence that maintains stability are the controls. The debris and flying concrete fragments (eye and face protection) round it out. The AHA built on silica/noise control and embedment/stability management is the one that protects the concrete- demolition crew.
The bottom line
A Selective Demolition for Concrete AHA names the concrete-breaking-silica/noise-vibration, the embedded- reinforcement/utility, and the structural-stability hazards with specific controls — silica-dust control with wet/HEPA methods plus hearing and vibration protection for breaking concrete, locating embedded reinforcement and utilities before cutting (concrete hides live conduit and post-tension tendons), and an engineering evaluation with shoring to maintain the stability of the remaining concrete. The silica/noise control and the embedment/ stability management are the defining concerns. The AHA that manages both is the one that protects the crew.
Frequently asked questions
Why is silica the primary hazard when breaking concrete?
Breaking, sawing, and drilling concrete generates respirable crystalline silica (a serious respiratory hazard), along with very high noise and hand-arm vibration — with breaking concrete being a major silica source and among the loudest construction activities. Controls are silica-dust control (water/wet cutting and drilling, dust collection/HEPA on breakers/saws/drills, respiratory protection), hearing protection, vibration management (handheld breakers), and the silica/noise/vibration controls.
Why locate embedded reinforcement and utilities before cutting?
Concrete is not solid stone — it contains embedded reinforcement (rebar), often embedded utilities (electrical conduit, pipe), and sometimes post-tension tendons — so cutting or breaking into it can mean cutting a live embedded conduit (shock), striking an embedded pipe, or cutting a post-tension tendon (which stores enormous energy and can release violently). Controls are locating embedded reinforcement and utilities before cutting/breaking (scanning/GPR to find embedded conduit, pipe, and post-tension tendons — a critical control), cutting reinforcement safely, and the embedment controls.
Why is the stability of the remaining concrete a concern?
Selectively removing concrete must maintain the stability of the remaining concrete structure — removing structural concrete (a section of a load-bearing beam, column, or slab) can compromise the structure. Controls are an engineering evaluation of the selective removal (which concrete is structural, what needs shoring/support before removal), shoring/supporting the remaining structure where required, a removal sequence that maintains stability, and the stability controls.
What is selective demolition for concrete?
Selective demolition for concrete is the removal of specific portions of cast-in-place or precast concrete — sections of slabs, walls, beams, columns, or foundations — while preserving the adjacent concrete that is to remain, using breaking, sawing, drilling, and controlled removal. Because breaking concrete generates silica/noise/vibration, concrete hides embedded reinforcement and utilities, and the remaining concrete's stability must be maintained, those hazards apply.
Related AHAs and JHAs
- Resurfacing of Cast-in-Place Concrete AHA — related concrete surface work
- Paving Removal AHA — related concrete/pavement removal
- Core Drilling and Concrete Saw Cutting JHA — the concrete-cutting 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.