The Teles Pires Hydroelectric Power Plant, in the Teles Pires River Basin, with an installed capacity of 1,820 megawatts, is among the largest hydroelectric plants in Brazil considering the installed capacity. The volume of concrete of the project, over 1,100,000 m3, corresponds to the sum of the massive and structural dam’s concrete. Several types of concrete were used, from wet mix shotcrete, RCC - (roller compacted concrete), and conventional concrete pumped for the most diverse applications. Considering the predominant use of pump concrete, in regions defined in Project where the RCC was not possible to be placed, it was necessary to make use of several resources, not only the concrete artificial cooling but also adding material of pozzolanic nature, in this case it was chosen Metacaulim HP as part of the cementitious material composition of the conventional concretes applied. Metacaulim HP as part of the cement was used in concrete mixtures with the initial objective of contributing to neutralize the alkali-aggregate type reaction (AAR) in the formulated concrete mixes. The replacement of part of the cement by Metacaulim HP assisted in the function of reducing the heat generated by the binder in the concrete mixtures applied in massive zones of the main concrete structures.

The benefits of using the binder also provided the modification of the concrete W/C ratio for hydraulic surfaces, based on abrasion studies in the concrete by the test method ASTM C1138.