Cement production alone currently accounts for about 8 percent of global CO 2 emissions, so considerable effort is going into lowering that number. Efficiency can be increased, and energy sources can ...

The calcium carbonate (CaCO 3) in limestone is only slightly soluble in water, but in the presence of acid, it reacts much more vigorously. It is the acid generated by absorption of the SO 2 into the ...

The production process for cement requires grinding and heating limestone in industrial kilns at temperatures as high as 2,800° F. That creates “clinker,” which is the base element of most types of ...

Cement does not look like a high-tech material. It is gray, dusty, and easy to overlook until you remember that it holds up roads, hospitals, data centers, bridges, schools, and the apartment blocks ...