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This is to certify that your paper entitled «The effect of polymer fibers on the mechanical properties of concrete and its parameters» was indexed with 13 pages, in the CIVILICA citation database, code COI:CMUECONF06_027, after evaluation and approval of the referees of the "6th International Conference on Modern Studies in Civil Engineering, Architecture, Urban Planning and Environment in the 21st Century held in Tehran 2021.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.