Over time, the everyday tasks associated with working in the concrete industry have changed. Originally, concrete was made on a construction site when sand was mixed with cement and water in a motor-driven mixer. Nowadays, many times concrete is premixed and delivered to work sites via ready-mix trucks equipped with a rotating drum, cutting down exposure to cement and concrete dust.
Concrete has been used in one form or another for more than 8,000 years, making it one of the oldest man-made building materials. All concrete essentially is a mixture of water, cement and aggregate (usually sand or rock). As building practices and standards have changed, so have these filler materials. One of these changes was the removal of asbestos in concrete.