The present work aims to evaluate the influence of the addition of metakaolin in concretes subjected to aggressive environments such as sewage treatment stations and in the laboratory with partial immersion in a solution containing sodium sulfate. The samples were submerged in the Sewage treatment plants (STP) for a period of 120 days. In the laboratory the samples were exposed for 60 days with cycles of drying and immersion. The results obtained were opposite. In the STP the concrete with addition of Metacaulim was more efficient and during its exposure to sodium sulfate a chemical reaction occurred between the components which caused a decrease of its resistance. In addition to the tests of axial and diametral compression modulus of elasticity and X-ray diffraction tests were carried out for potential measurement and microscopy of the steel in order to verify the possibility of initial corrosion of steel bars in test specimens in reinforced concrete.
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