Hardened portland cement concrete

Hazardous Ingredients

OSHA Exposure Limits in Air Quantity Chemical Names CAS Number Formula (Percent) ACGIH TLV TWA(2) OSHA PEL(3) NIOSH REL(4) Crystalline silica 10 mg/m3 14808-60-7 15-25(1) SiO2 0.025 mg/m3 0.05 mg/m3 (aggregate) %SiO2+2 Magnesium oxide 1309-48-4 < 5 MgO 10 mg/m3 15 mg/m3 -- (cement) Calcium oxide (cement) 1305-78-8 <10 CaO 2 mg/m3 5 mg/m3 -- Calcium hydroxide 1305-62-0 <20 Ca(OH)2 5 mg/m3 -- (cement) C3S, C2S, Portland cement(5) 65997-15-1 Oct 30, 2010 5 mg/m3 10 mg/m3 -- etc Calcium carbonate(5) 1317-65-3 20-40 CaCO3 5 mg/m3 10 mg/m3 -- (1) Assumes concrete mix is composed of approximately 75% granite aggregate which contain approximately 13.5% silica as measured by DCM Science Labs, Wheat Ridge, Colorado. (2) ACGIH TLV: American Conference of Industrial Hygienist Threshold Limit Value (TLV) time-weighted average (TWA). (3) OSHA PEL: Occupational Safety and Health Administration Permissible Exposure Limit for an 8-hour time weighted average. (4) NIOSH REL: National Institute for Occupational Safety & Health, Recommended Exposure Limit (5) Assumes no asbestos present and 1% crystalline silica. SECTION 3 – HAZARD IDENTIFICATION Overview: This product contains a mixture of portland cement, water, and aggregates (sand and gravel). The naturally occurring aggregate, typically granite and/or limestone, contains varying amounts of crystalline silica as described herein. When cutting, drilling or breaking hardened concrete, do not breath the dust. This product may also contain small quantities of admixtures from secondary producers including: Daravair M/R, WRDA with Hycol, Eclipse, Recover, Mira 85, Polarset, ADVA, DCI Corrosion Inhibitor (from W.R. Grace), fly ash (from Headwaters), Xypex, as well as colors and fibers. For information on these products, consult with Graniterock or the manufacturer. Potential Health Effects Inhalation: Inhalation of dust containing crystalline silica can potentially lead to: Silicosis: Acute silicosis may occur under conditions of extremely high respirable crystalline silica (quartz) exposure. Silicosis is a fibrosis (scarring) of the lungs, and may be progressive. Lung Cancer: Crystalline silica (quartz) inhaled from occupational sources is classified as carcinogenic to humans. Autoimmune disorder: There is evidence that exposure to respirable crystalline silica or silicosis is associated with the increased incidence of scleroderma, an autoimmune disorder. Tuberculosis: Several studies indicate that silicosis increases the risk of tuberculosis. Bronchitis/Emphysema: Respiratory aliments including bronchitis and emphysema may be aggravated by exposure to respirable crystalline silica. Eye contact: Crystalline silica (quartz) may cause abrasion, irritation, redness and/or watering of the eyes. Skin contact: Not applicable. Chronic: The adverse health effects mentioned above (silicosis, cancer, scleroderma, and tuberculosis) are considered chronic effects. Reproductive: Reproductive toxicity has not been demonstrated.