PSI - Issue 64

S. Kolemenoglu et al. / Procedia Structural Integrity 64 (2024) 857–868 Author name / Structural Integrity Procedia 00 (2019) 000–000

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conditions with the column specimens until testing. The compression tests of cylindrical concrete specimens were conducted at two different ages of concrete. The first tests were conducted at the initiation of the testing of columns corresponding to the concrete age of 146 days. The last (and the second) tests were conducted at the end of the experimental program at the concrete age of 374 days. The average values of first and last cylindrical compression tests results were 38.5 and 39MPa, respectively. The standard deviation for all compression test results were calculated as 3.3 MPa. The cementitious, fiber reinforced (polypropylene) and low shrinkage structural mortar, was used for repair applications. According to the environmental declaration of the product, the mortar is produced with SCM (supplementary cementitious material) and satisfy approximately 1.5 kg CO 2 saving for each 25 kg of mortar. The mortar compression strengths were determined with the uniaxial compression tests on 40mmx40mmx40mm specimens, which were tested just before the testing of repaired specimens. The pull-off test was conducted according to EN 1542 (1999). The bonding primer used in this study was also used in pull-off tests as a layer in between structural mortar and concrete. The concrete of pull-off test was same as the concrete specified in EN 1542 (1999). The main mechanical properties of the materials used for specimen construction and repair are presented in Table 3 with average values, standard deviations and number of tests. The young modulus and tensile strength values are provided as indicated in the technical sheets of the product. EN 13412 (2006), EN 12190 (1998) documents were followed by the producer for young modulus and tensile strength determination.

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Fig 1. (a) Details of the tested columns, (b) measurement installation

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(b) Fig 2. (a) Loading history, (b) Schematical representation of loading history upon residual displacement