Cement Dust Monitoring
Personal IOM-head inhalable and cyclone respirable sampling for Portland cement (inhalable 10 mg/m³, respirable 4 mg/m³). UKAS-accredited gravimetric analysis at a UKAS-accredited laboratory. For batching plants, precast factories, dry-bagging operations and demolition.
A WEL for both inhalable and respirable fractions
Portland cement is one of the few substances in HSE document EH40 with separate Workplace Exposure Limits for the inhalable and respirable fractions: 10 mg/m³ inhalable and 4 mg/m³ respirable, both 8-hour TWAs. That means a defensible compliance survey usually needs both an IOM head and a cyclone running simultaneously on the same workers.
Cement dust is alkaline (pH ~12 in the presence of moisture), and aside from the bulk dust risk it causes contact dermatitis, eye irritation and chronic chemical burns where it contacts sweaty skin. Hexavalent chromium content (added to most UK cement since the 2005 EU directive to control allergic contact dermatitis) limits but doesn't eliminate this risk.
High-exposure operations include dry bagging, silo-tanker connections, mix-truck loading at batching plants, precast concrete mould release and demolition of concrete structures.
Cement-handling operations we sample
Both inhalable and respirable fractions need separate sampling heads on these operations.
Concrete Batching Plants
Silo intake, weigh-hopper discharge, mixer charging and truck-loading. Connection and disconnection of bulk tankers is the highest short-term exposure event.
Precast Concrete Factories
Mix prep, mould-release spraying, demoulding and curing-chamber operations. Dust exposure compounds with respirable silica from the aggregate fines.
Dry-Bagging Operations
Bagging of cement, mortar mixes and screed products into 25 kg sacks. Often the dustiest job in the construction-materials supply chain.
Demolition Contractors
Mechanical and hand demolition of concrete structures generates substantial inhalable and respirable cement dust plus silica from the aggregate.
On-Site Concrete Cutting
Sawing, coring and scabbling of cured concrete — mixed exposure to cement-paste dust, aggregate dust and respirable crystalline silica.
Ready-Mix Plants & Lorry Drivers
Tanker loading and discharge operations, plus the lorry-driver tasks of hose connection and chute cleaning.
How we sample cement dust
Both IOM and cyclone heads running simultaneously to cover both EH40 WELs in a single visit.
Frequently Asked Questions
What are the cement dust WELs?
Portland cement has two Workplace Exposure Limits in HSE document EH40: 10 mg/m³ inhalable (8-hr TWA) and 4 mg/m³ respirable (8-hr TWA). A defensible compliance survey usually samples both fractions simultaneously.
Is cement dust just a dust risk?
No. Cement is alkaline (pH ~12 in the presence of moisture) and causes contact dermatitis, eye irritation and severe chemical burns to sweaty skin. The hexavalent chromium content (reduced under the 2005 EU directive) caused widespread allergic dermatitis historically.
Should we worry about silica when sampling cement?
Yes. Aggregate handling and concrete cutting expose workers to respirable crystalline silica from the sand and stone fractions. We recommend adding XRD silica analysis to the cyclone filter on most batching, precast and demolition surveys — the 0.1 mg/m³ silica WEL is frequently the binding constraint.
How often should cement dust be monitored?
Baseline survey on commissioning or major plant change, then annually for batching plants and precast factories; six-monthly for high-exposure dry-bagging operations; within three months of any significant LEV or process change.
How much does cement dust monitoring cost?
A typical dual-head (inhalable + respirable) baseline survey of 4 to 6 workers, including silica add-on analysis, starts from around £1,100 to £1,500 plus VAT.