Correlação entre a resistividade elétrica superficial e a resistência à compressão de concretos submetidos aos diferentes ataques de sulfatos

Abstract

One of the main parameters currently used for the monitoring of electrical resistance paint, which is not a decent test, and is a topic of scientific research at present. On the other hand, the construction resistance is considered a destructive test, considered the main one. It is known that it is a structure of resistance to the concrete structure that is maintained and constant from the maintenance of electric cement and constant according to the structure of the electric pores Thus, analyze in concrete and the durability of the aggressiveness when carrying out tests of aggressiveness conditions to carry out periodic inspections that can customize the unimportant structure, which can often be precarious In this work, cylindrical specimens are molded in size 100 mm in diameter and 200 mm in height with the trace 1:1,4:2, 1 (cement, sand and gravel) with CPV-RS cement and with a water/cement ratio of 0.42 without the use of additives. There are two types of attacks: internal and external. The internal attack was carried out in two ways. The first consists of replacing 1% of magnesium sulfate in relation to the fine aggregate. The second was the replacement of 10% of magnesium sulfate in relation to the fine aggregate. The external attack was done by exposure to the wetting and drying cycle which was also carried out in two ways. The first, with the insertion of 150 mg/L. And the second, with an insertion of 50.000 mg/L. After curing for 28 days in a humid chamber, groups of specimens were exposed to wetting and drying cycles. Surface electrical resistivity tests were performed at 31, 150, 272 days of age. Age resistance tests were performed at 34, 154 days. Analyzing the evolution time for a series of surface results that the electrical resistance increased over the analysis time of all versions, however, the one that had the evolution of all the series, however, the one that had 10% of annex sulfate serial with 10% attached on dash. In after resistance to resistance, one in the first 50 days, due to the resistance of the initial values and, except for the values that were not changed from the original values, the values of sulfates were changed. By correlating as two properties, the highest coefficient of determination was found in the reference series.