What Is a Cement Mason?

The onset of cement pneumoconiosis is long and the disease progresses slowly. The main clinical symptoms are respiratory symptoms with shortness of breath. There was a slight shortness of breath in the early stages, and he had to walk sharply on flat roads, climb uphills, and get worse when going upstairs. The second cough is mostly intermittent dry cough, with few wet and dry rales. Pulmonary function changes are manifested as obstructive ventilation dysfunction, which often precedes symptoms and chest X-ray findings. Late mixed dysfunction may occur. The chest X-ray manifestations of cement pneumoconiosis are mainly small irregular shadows "S" formed by dense intersections of different thicknesses, lengths, and shapes. Among the small irregular shadows, lighter density, irregular shapes, and contours can also be seen. Unclear round small shadow. ^[1]

Cement pneumoconiosis

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The onset of cement pneumoconiosis is long and the disease progresses slowly. The main clinical symptoms are respiratory symptoms with shortness of breath. There was a slight shortness of breath in the early stages, and he had to walk sharply on flat roads, climb uphills, and get worse when going upstairs. The second cough is mostly intermittent dry cough, with few wet and dry rales. Pulmonary function changes are manifested as obstructive ventilation dysfunction, which often precedes symptoms and chest X-ray findings. Late mixed dysfunction may occur. The chest X-ray manifestations of cement pneumoconiosis are mainly small irregular shadows "S" formed by dense intersections of different thicknesses, lengths, and shapes. Among the small irregular shadows, lighter density, irregular shapes, and contours can also be seen. Unclear round small shadow. ^[1]

Cement is a fine powder made by mixing a mixture of clay and lime at high temperature to form cement clinker, which is then ground. Water is added to the cement to form a slurry, and then gradually hardens into a solid body like a stone. Cement can be mixed with sand and gravel to form mortars and clays. Cement is a synthetic silicate. The production raw materials are mainly limestone. Due to the different varieties, there are still clay, coal ash, iron ore powder, slag, gypsum, vermiculite, shale and other components. Cement production can be divided into two major processes: raw meal and clinker. The former includes raw material mixing and drying, while the latter includes calcination, milling, and packaging of finished cement products.

Coal mining and dressing industries, such as shotcrete, concrete reinforcement, coal lane reinforcement; ferrous metal mining and dressing industries, such as ferrous mine support; non-ferrous metal mining and dressing industries, such as non-ferrous mine support; construction materials and other non-metallic mining and dressing Industry, such as chemical mine support, non-metal mine support; power, steam, hot water production and supply industry, such as hydropower construction; cement manufacturing, such as raw material calcination, clinker cooling, clinker grinding, cement packaging, Cement homogenization, preparation of cement and pulverized coal, cement transportation; cement and asbestos cement products industries, such as weighing ingredients, mixing and stirring, compact molding, and pulping and homogenization; transportation equipment manufacturing, such as ship masonry; construction industry, Such as cement transportation, feeding, mixing, pouring. Cement pneumoconiosis is a disease of diffuse fibrosis of the lung caused by long-term inhalation of cement dust, and belongs to the silicate pneumoconiosis. Its incidence is related to the time of dust exposure, dust concentration and dispersion, and personal fitness. The general working age is more than 20 years, and the shortest is 10 years. The pathological changes of cement pneumoconiosis are mainly caused by dust spots and emphysema around the dust spots, and there are interstitial fibrosis, and there may also be large lesions formed by dust spots and collagen fibers.