Identify, evaluate, and control every hazard associated with concrete pouring operations on UK construction sites
A complete practical guide to Concrete Pour Risk Assessment in 2026. Covers COSHH requirements, formwork and falsework hazards, manual handling, working at height, environmental conditions, legal duties under CDM 2015, and step-by-step risk control measures aligned with HSE and BS EN 206 guidance.
A site-ready reference for principal contractors, site managers, concrete technologists, and health & safety advisors on UK projects
A Concrete Pour Risk Assessment is a formal, documented evaluation of all foreseeable hazards arising from concrete mixing, delivery, pumping, placing, compacting, and finishing operations on site. It is a legal requirement under the Management of Health and Safety at Work Regulations 1999 and the Construction (Design and Management) Regulations 2015 (CDM 2015). Every concrete pour — from a domestic foundation to a high-rise core wall — requires a site-specific risk assessment before work begins in 2026.
Under CDM 2015, the Principal Contractor must ensure a Construction Phase Plan (CPP) is in place covering all high-risk activities including concrete pours. The COSHH Regulations 2002 require a specific assessment of wet concrete as a hazardous substance (cement contains chromium VI and is caustic at pH 12–13). The Manual Handling Operations Regulations 1992 apply to all lifting and carrying of materials during pour operations, including hose handling and formwork erection.
A Concrete Pour Risk Assessment must be completed before any pour begins — ideally during the pre-construction planning phase and reviewed immediately before each individual pour. It should be updated whenever pour conditions change: different structural element, new subcontractor, change of season, pump location change, or following any near-miss or incident. The assessment must be communicated to all operatives on the pour team via a toolbox talk before work starts.
▲ Risk level shown per pour stage. Placing and pouring presents the highest combined hazard exposure on most UK sites.
| Likelihood ↓ / Severity → | Minor | Moderate | Serious | Fatal |
|---|---|---|---|---|
| Very Likely | Medium | High | Very High | Very High |
| Likely | Low | Medium | High | Very High |
| Unlikely | Low | Low | Medium | High |
| Rare | Low | Low | Low | Medium |
Concrete pour operations sit at the intersection of multiple pieces of UK health and safety legislation. Failure to comply can result in Improvement Notices, Prohibition Notices, prosecution, and unlimited fines under the Health and Safety at Work etc. Act 1974. In fatal cases, the Corporate Manslaughter and Corporate Homicide Act 2007 may apply. The key regulations every site manager must understand before any concrete pour are listed below.
The Construction (Design and Management) Regulations 2015 require the Principal Contractor to prepare and maintain a Construction Phase Plan (CPP) covering all significant site hazards. Concrete pours — particularly at height, in confined spaces, or involving large volumes — must be explicitly addressed in the CPP with method statements and risk assessments signed off before work starts.
Wet concrete is a hazardous substance under COSHH. Cement contains chromium VI (hexavalent chromium), a known skin sensitiser and carcinogen. Fresh concrete is also highly alkaline (pH 12–13), causing severe chemical burns on prolonged skin contact. A COSHH assessment must identify exposure risks, specify PPE (gloves, eye protection, waterproof boots), and provide emergency first aid procedures for skin and eye contact.
Concrete hose handling, vibrator use, formwork erection, and bagged materials all involve significant manual handling risk. The regulations require employers to avoid manual handling where reasonably practicable, assess remaining tasks, and reduce the risk of injury. Pump hoses in particular can exert high reaction forces — operatives must be trained in safe handling technique and fatigue management during long pours.
Any concrete pour onto a suspended slab, into an elevated form, over an edge, or from a mobile elevated working platform (MEWP) triggers Work at Height Regulations. Edge protection, guardrails, and toe boards must be in place before the pour starts. Pump hose operatives working near slab edges or in elevated positions must be covered by a specific working at height plan within the risk assessment.
The Lifting Operations and Lifting Equipment Regulations 1998 apply to any crane-lifted concrete skip or kibble. The skip must be thoroughly examined every 6 months, the lift must be planned by a competent person, and a banksman must be in attendance. Loads must never be suspended over workers — exclusion zones must be enforced during all crane-lifted concrete operations.
Internal poker vibrators expose operatives to Hand-Arm Vibration (HAV). The daily exposure action value (EAV) is 2.5 m/s² A(8) and the exposure limit value (ELV) is 5.0 m/s² A(8). Long continuous vibrator use on large pours can quickly exceed the EAV. Rotate operatives, use anti-vibration gloves, and monitor exposure times using manufacturers' trigger time data to maintain compliance in 2026.
The following hazard register covers the primary risks identified in a Concrete Pour Risk Assessment for a typical UK reinforced concrete project. Risk ratings are given before controls (inherent risk) and after controls (residual risk). All risks should be reduced to Low or Medium before pouring commences.
| Hazard | Who Is at Risk | Inherent Risk | Control Measures | Residual Risk |
|---|---|---|---|---|
| Wet concrete skin contact (chemical burns) | All operatives | Very High | Nitrile gloves, waterproof boots, long sleeves, face shield when pumping. First aid wash station on site. | Low |
| Eye contact with fresh concrete / splashing | Pump operator, finishers | High | Safety goggles or face shield mandatory. Eye wash station within 10 m of pour point. Emergency procedure briefed. | Low |
| Formwork / falsework collapse during pour | Operatives under/near form | Very High | Formwork designed by competent engineer. Inspection checklist signed before pour. Maximum pour rate (m/hr) set and enforced. | Medium |
| Concrete pump hose whip / blockage | Pump operator, hose handler | Very High | LOLER-compliant pump. Safety chain/whip check on all couplings. Exclusion zone around delivery hose end. No bends tighter than 1 m radius. | Medium |
| Readymix truck reversing / pedestrian strike | All site personnel | Very High | Banksman with hi-vis and whistle. Segregated pedestrian route. Vehicle exclusion zone marked. Mirrors on blind-spot trucks. | Low |
| Falls from slab edge during pour | Hose operatives, finishers | Very High | Guardrails ≥ 950 mm height with mid-rail and toe board. Leading-edge protection before pour deck advanced. Safety harness if guardrail not possible. | Medium |
| Crane-lifted concrete skip — load falling | Operatives below lift zone | Very High | LOLER inspection certificate. Exclusion zone under lift path. Banksman communication with crane operator. Skip never swung over workers. | Low |
| Hand-arm vibration from poker vibrator | Vibrator operators | High | Monitor trigger time per shift. Rotate operators every 30 minutes. Anti-vibration gloves. Health surveillance for long-term operatives. | Medium |
| Manual handling injury (hose, vibrator, formwork) | All operatives | High | Manual handling training. Team lifts for items > 25 kg. Mechanical aids where possible. Short shift rotations during sustained hose work. | Medium |
| Environmental – washout water contamination | Environment / watercourses | High | Designated washout bay with sump. No washout to drains or watercourses. Cement slurry disposed as controlled waste. Bunded delivery area. | Low |
| Hot weather — accelerated set, heat stress | Operatives, concrete quality | Medium | Shade rest areas. Drinking water available. Reduce pour times. Specify retarder admixture. Monitor ambient temperature and concrete temperature at discharge. | Low |
| Cold weather — frost damage to fresh concrete | Concrete quality / structure | Medium | Check weather forecast. Cover poured concrete with insulating blankets if <5°C predicted. Use accelerating admixture. Record concrete temperature at pour. | Low |
Wet concrete is classified as a hazardous substance under the Control of Substances Hazardous to Health Regulations 2002. Every UK site using concrete must have a COSHH assessment in place. The primary hazards are cement dermatitis (skin sensitisation from chromium VI), alkaline burns (pH 12–13 causes progressive tissue destruction on prolonged contact), and silica dust from dry cement or concrete cutting (risk of silicosis).
WEL = Workplace Exposure Limit (EH40/2005 updated 2020). All UK employers must not exceed this value.
Formwork failure is one of the most serious risks in a Concrete Pour Risk Assessment and has caused multiple fatalities on UK sites. Fresh concrete exerts significant hydrostatic pressure on formwork, particularly when poured rapidly into tall sections. The lateral pressure can reach 24 kN/m² for a 2 m wall poured quickly, rising to over 60 kN/m² for a full 5 m lift. Formwork must be designed by a competent engineer and inspected immediately before and during the pour.
Under BS 5975:2019+A1:2019 (Code of Practice for Temporary Works), all falsework requires a Temporary Works Coordinator (TWC) to be appointed. The TWC must approve the design, specify the maximum pour rate, and sign off the pre-pour checklist. For deep retaining wall pours or basement construction, a formal Temporary Works Design drawing is mandatory regardless of project size.
Concrete pump operations introduce specific mechanical hazards that require dedicated risk controls within the broader Concrete Pour Risk Assessment. The pump itself must hold a valid LOLER examination certificate (6-monthly for static pumps, 12-monthly for truck-mounted boom pumps). The ground bearing capacity at the outrigger positions must be verified before deployment, as an overloaded outrigger pad can cause catastrophic pump overturn.
Concrete pump hose whip occurs when a blockage suddenly clears under pressure, causing the end hose to swing violently. All delivery hose couplings must have safety chains or whip-check cables installed. The hose end should be held firmly by a trained operative — never left unattended under pressure. An exclusion zone of at least 3 m around the hose end must be enforced during active pumping.
Boom pump outrigger loads can reach 20–35 tonnes per pad during full extension. The site must confirm adequate ground bearing capacity before deployment. Timber spreader mats or steel pads must be used on soft ground. Trucks must never be parked with outriggers over underground services, voids, or within the collapse zone of a trench or excavation edge.
Boom pumps present a serious overhead strike hazard when working near overhead power lines. Under HSE guidance, a minimum exclusion zone of 9 m from uninsulated 33 kV lines must be maintained by the boom arm. Contact the Distribution Network Operator (DNO) to confirm line voltage before any pumping near overhead cables. Consider requesting a temporary line diversion for extended works.
Weather conditions significantly affect both the safety and quality risks during a concrete pour. UK site managers must carry out a weather-specific risk review for any pour where temperatures fall below 5°C or rise above 25°C, as both extremes alter the fresh concrete behaviour and increase the risk of structural defects or operator health incidents. The Concrete Society Technical Report TR71 provides detailed guidance on hot and cold weather concreting in the UK.
| Condition | Risk to Concrete Quality | Risk to Operatives | Control Measures |
|---|---|---|---|
| Below 5°C | Frost damage, extended set, failed strength gain | Slip hazard on frozen ground, cold stress | Insulating blankets, accelerating admixture, check concrete temp ≥ 5°C at discharge, heated enclosures for critical pours |
| Below 0°C | Freeze before sufficient strength — catastrophic quality failure | Ice on walkways, hypothermia risk | Do not pour if ambient temperature below 0°C without specific cold weather plan. Preheat formwork. Heat water in mix. |
| Above 25°C | Rapid slump loss, early stiffening, plastic shrinkage cracking | Heat stress, dehydration | Retarder admixture, chilled mix water, sun shade over pour zone, cool aggregates, early morning pour scheduling |
| High Wind (> 30 km/h) | Surface drying and plastic cracking on exposed slabs | Flying debris, dust, formwork instability | Windbreak screens around pour, polythene sheeting immediately after finish, wind speed monitoring on site |
| Rain during pour | Increased w/c ratio if rain enters mix — reduced strength | Slippery surfaces, reduced visibility | Temporary shelter over pour if heavy rain. Monitor slump. Cover placed concrete with polythene immediately after finish. |
The following checklist should be completed and signed by the Site Manager or Foreman no more than 2 hours before any concrete pour begins. It should form part of the construction phase plan and be retained on site for inspection. A copy must be given to the concrete pump operator and the readymix plant dispatcher.
For larger or more complex pours — particularly those involving significant volumes, elevated positions, or proximity to the public — the risk assessment should be supplemented with a full Method Statement describing the sequence of operations step by step. This document, combined with the risk assessment, forms the RAMS (Risk Assessment and Method Statement) package required under CDM 2015 for notifiable projects.
Every operative on a concrete pour has the right and duty to stop work if they identify an imminent risk to safety that has not been assessed or controlled. Common stop-work triggers include: formwork showing signs of movement or deflection, pump hose blockage clearing violently, any operative not wearing required PPE, unexpected groundwater ingress, overhead powerline proximity, or concrete arriving with incorrect consistency. Under HSE guidance and the Health and Safety at Work Act 1974, no worker can be penalised for stopping work in good faith over a genuine safety concern.
Construction (Design and Management) Regulations 2015 — sets out duties for clients, principal designers, principal contractors, and workers on all UK construction projects. Governs the preparation of Construction Phase Plans covering concrete pour risk assessments on notifiable projects in 2026.
HSE CDM Guidance →Control of Substances Hazardous to Health Regulations 2002 — requires employers to assess and control exposure to wet concrete (chromium VI, alkaline burns) and dry cement dust (respirable silica). HSE EH40 Workplace Exposure Limits document sets the 0.1 mg/m³ WEL for respirable crystalline silica applicable to concrete operations.
HSE COSHH Guidance →Code of Practice for Temporary Works Procedures and the Permissible Stress Design of Falsework. Mandatory reference for all formwork and falsework design on UK sites. Specifies roles of the Temporary Works Coordinator, design requirements for wall formwork, and pour rate calculations to prevent formwork overload during concrete pours.
BSI Standards →