Freshly Mixed Unhardened Concrete

SECTION 2: Hazards identification

2.1 Classification of the substance or mixture

Irritant

Signal word

Warning

Hazard statements

Acute: Wet plastic, unhardened concrete can dry the skin and cause alkali burns Chronic: Hypertensive individuals may develop and allergic dermatitis –Portland cement may contain trace amounts of chromium Carcinogenicity: Wet plastic concrete is not carcinogenic. Carcinogenic Potential: Category 1A - Concrete frequently contains crystalline silica in concentrations greater than 0.1%, principally contributed by the aggregates. Respirable crystalline silica is classified by IARC (International Agency for Research on Cancer) as a known human carcinogen and by NTP (National Toxicology Program) as “reasonably anticipated to be carcinogenic.” Crystalline silica in wet concrete is not respirable and does not pose a hazard when the concrete is in its plastic or unhardened state. Once concrete has hardened, long term exposure to airborne dust generated by grinding, sawing, drilling or breaking of hardened concrete, could potentially lead to hazardous exposures to workers and subsequent health related problems. Appropriate respiratory protection should be worn during these operations. Use barrier creams, gloves, boots and clothing to protect the skin from prolonged contact with plastic (wet) concrete. Particularly avoid abrasion of the skin in contact with unhardened plastic concrete. Precautions must be observed because cement burns occur with little warning – little heat is sensed. Eye protection is not generally required, except when placing methods cause splash, then tight fitting goggles should be used.