Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 53 10 2021 12 22 Assessing the compressive strength and permeability of protective coating layers applied to CFRP sheets, under harsh environmental conditions Assessing the compressive strength and permeability of protective coating layers applied to CFRP sheets, under harsh environmental conditions 4379 4396 4056 10.22060/ceej.2020.18324.6836 FA Mahmood Naderi Department of civil engineering, Faculty of engineering, International Imam Khomeini university, Qazvin, Iran Roza Rahbari Department of Civil Engineering, Engineering Faculty, International Imam Khomeini University, Qazvin, Iran Journal Article 2020 04 26 In this paper, the results of the effect of exposure of CFRP strengthened and coated 150mm concrete cubes to harsh environments are presented. The harsh environment included: wet-dry, freeze-thaw and different temperature change cycles. It is anticipated that the intended environmental conditions harm the performance of the CFRP sheet by reducing the compressive strength of concrete and, at the same time, increase its permeability. The test specimens used in this investigation included 150mm CFRP strengthened concrete cubes with and without protective coating layers. The methods employed were "Cylindrical Chamber" permeability, mortar capillary water absorption and mortar compressive strength tests. The results obtained tend to indicate that the proper selection of protective coating has a significant impact on the performance of the CFRP-coated concrete cubes that were under harsh environmental conditions. Application of suitable coatings onto the CFRP layer caused respective reductions of about 28%, 34%, and 36%, on the permeability of specimens after being exposed to specified wet-dry, freeze-thaw and temperature change cycles. In this paper, the results of the effect of exposure of CFRP strengthened and coated 150mm concrete cubes to harsh environments are presented. The harsh environment included: wet-dry, freeze-thaw and different temperature change cycles. It is anticipated that the intended environmental conditions harm the performance of the CFRP sheet by reducing the compressive strength of concrete and, at the same time, increase its permeability. The test specimens used in this investigation included 150mm CFRP strengthened concrete cubes with and without protective coating layers. The methods employed were "Cylindrical Chamber" permeability, mortar capillary water absorption and mortar compressive strength tests. The results obtained tend to indicate that the proper selection of protective coating has a significant impact on the performance of the CFRP-coated concrete cubes that were under harsh environmental conditions. Application of suitable coatings onto the CFRP layer caused respective reductions of about 28%, 34%, and 36%, on the permeability of specimens after being exposed to specified wet-dry, freeze-thaw and temperature change cycles. https://ceej.aut.ac.ir/article_4056_9529fbba677729d3206b3b9073d1e9ca.pdf