Tạp chí Khoa học Giao thông vận tải, Tập 72, Số 9 (12/2021), 1010-1022 1010 Transport and Communications Science Journal EXPERIMENTAL STUDY TO ESTIMATE COMPRESSIVE STRENGTH OF CONCRETE CONFINED BY CFRP SHEET Dao Sy Dan * , Pham Hoang Kien, Pham Van Phe University of Transport and Communications, No 3 Cau Giay Street, Hanoi, Vietnam ARTICLE INFO TYPE: Research Article Received: 23/08/2021 Revised: 21/10/2021 Accepted: 26/10/2021 Published online: 15/12/2021 https://doi.org/10.47869/tcsj.72.9.1 * Corresponding author Email: sydandao@utc.edu.vn Abstract. The CFRP (Carbon Fiber Reinforced Polymer) sheet is a new material with many outstanding advantages and it is especially suitable for strengthening reinforced concrete structures. That material was firstly applied in developed countries in 1980s, but it is relatively new in Vietnam. In this study, an experimental study was performed to estimate compressive strength of the concrete cylinder confined by CFRP sheet of Toray firm, Japan, with various levels of CFRP sheets. Results show that the strengthening effect of CFRP sheet in this study is generally suitable to the models proposed by previous researchers. The strengthening effect of CFRP sheet much depends on the construction quality of CFRP sheet; it requires that the builder must have experience and strictly follows the instruction of CFRP distributor. From the test results, this study recommends to apply suitable models to estimate compressive strength of concrete confined by CFRP sheet of Toray firm (Japan) and other products as well. Keywords: CFRP, compressive strength, confined concrete. © 2021 University of Transport and Communications