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Amazing advances in concrete technology and the accessibility of a wide range of materials such as high-range water-reducing admixtures and silica fume have been made these days. It can be said there is high probability to obtain the production of ultra high performance fiber reinforced concrete (UHPFRC) that can provide compressive strength up from 120 MPa to 185 MPa. Because of its remarkable improvement in durability, UHPFRC usage in concrete columns have increased lots of interest in the strengthening and retrofitting of concrete structures. The aim of this study is to investigate the effect of cross-sectional shape properties of fire damaged concrete on the confinement of UHPFRC in which the key parameters relative to its performance are cross sectional area, aspect ratio, and side to corner radius ratio (B/r) of concrete. This study proposes to use UHPFRC as jacketing material for fire damaged concrete columns. However, its application for fire damaged concrete columns is very limited. Numerical study by Leonardi et al. (2010) found that UHPFRC has very promising potential for jacketing material for fire damaged square concrete columns, but experimental study is required for verification. Thereafter, thorough investigations were carried out in this paper in order to explore the confinement efficacy of UHPFRC jackets using various parameters as mentioned. In which, the investigated cross-sectional shape properties of concrete are critical factors in determining the successfulness of repair material used in rehabilitant of fire damaged reinforced concrete. Therefore, the results from this research can be used by engineers to predict the improvement made by UHPFRC confinement on fire damaged. It is believed that this research able to increase the human capital with the knowledge and expertise in strengthening work for fire damaged concrete structures. [ABSTRACT FROM AUTHOR]