The paper provides the results of the investigation into transformer-oiled reinforced concrete structures that has been carried out alongside with using an elastic recoil method, ultrasonic testing, and a breaking-off and chipping method. To ensure correct results, testing was applied to the adjacent oiled and dry areas of each structure. The results of all testing methods were found close to each other with regard to all data information obtained in the oiled and dry areas, i.e. no significant tendency in changing the concrete strength was noted when concrete was oiled with transformer oil. The investigation showed that traditional belief in the negative effect of oiling the concrete on physical and mechanical properties of the material is not true, at least for the transformer oil. One can assume that the oil effect on the concrete depends on the type of oil, composition (type of cement and fillers, water-to-cement content, etc) and cement structure (number of pores and microcracks), structure application environment condition, and the structure age prior to oiling, etc. Respectively, it requires a more detailed study into oiled structures in each specified case.
reinforced concrete structures, transformer oil, rebound hammer method, ultrasonic inspection, shear test, concrete strength
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