Concrete is made of cement and other cementitious materials and sand stirred into

Concrete is made of cement and other cementitious materials and sand, stone and aggregate mixing with water pouring condensed , with the construction of Building and construction engineering technology to enhance efficiency , reinforced concrete had already become a variety of architectural master The main body and the large bridge structure type, replacing the traditional brick, masonry .
Data show that Concrete mixing plants world's annual new construction of the largest countries in each of the two billion square meters
New area , equivalent to 40% of the world consumption of cement and steel , but only last 25-30 years.In contrast, a much longer life expectancy in developed countries the building , such as the UK , the average life expectancy of 132 buildings Years, the U.S. life expectancy reached 74 years of construction . On the other hand , the main material constituting the cement concrete ,Is also facing serious challenges : stationary concrete batching plant firing mainly in large formation of limestone and clay ,Every produce 1 ton of cement , it produces nearly one ton of carbon dioxide in the anthropogenic emissions of greenhouse gases , about 5% from cement production .