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CONCRETE POURING
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The construction of Itaipu consumed 12.3 million m3 of concrete, a sufficient volume to build 210 football stadiums like that of Maracanã in Rio de Janeiro.

Concrete was poured at an uncommon speed. The volume of concrete poured in a single day reached 15 thousand m3 and, in a single month, 340 thousand m3. In order to guarantee the supply of materials, such as cement and iron, a true war-time operation was put into practice. It was the means of guaranteeing a continuous flow of material, to prevent workers being left idle. 

Even so, to prevent risks, the industrial yard was equipped with two clinker mills in case the Brazilian and Paraguayan supplier firms' production capacity was unable to attend the additional demand represented by Itaipu, amounting to an average of 500 thousand tons of cement per year. 

The possibility of importation was rejected since it would have to be undertaken in large quantities and cement is a perishable product. When stocked for a long time, it becomes hydrated and "sets", which represents a great waste of material. These precautions finally resulted excessive since both countries increased their production capacity and were able to meet the requirements of the project. The mills were never operated.

During the construction, four rock crushing centers were installed, two on each bank, for producing aggregates, with a total capacity of 2,430 tons/hour, and six concrete mixing plants, with a capacity of 180 cubic meters/hour each. The transportation and pouring of the concrete was enabled by the installation of two monorails with a capacity of 900 cubic meters/hour, seven aerial cableways, and 13 tower cranes.

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