While the mixture is still wet, workers toss additional marble chips of various colors into each panel and roll a lightweight roller over the entire surface. Slight depressions left by the grinding are filled with a matching grout material and hand troweled for a smooth, uniform surface. Terrazzo workers then clean, polish, and seal the dry surface for a lustrous finish. Working Conditions Concrete or terrazzo work is fast paced and strenuous. Since most finishing is done at floor level, workers must bend and kneel a lot.
Many jobs are outdoors, but work is generally halted during rain or freezing weather.
To avoid chemical burns from uncured concrete and sore knees from frequent kneeling, many workers wear kneepads. Workers usually wear water-repellent boots while working in wet concrete. Most concrete masons worked for concrete contractors or for general contractors on projects such as highways, bridges, shopping malls, or large buildings such as factories, schools, and hospitals. A small number were employed by firms that manufacture concrete products. Most terrazzo workers worked for special trade contractors who install decorative floors and wall panels.