Abstract: The trend of promoting sustainability of most nations on their economic sectors led to the development methods aiming to provide a more sustainable and economical approach in the industry. For instance, the bamboo framing system has the potential to decrease carbon emission and is economical for construction. However, the issue on bamboo frame is that failure mostly occurs on the frame’s joint connection. Such notion led the researchers to improve the compressive capacity of T-connection of the bamboo frame by infilling mortar to the internode of the sample. In this study, three mortar mix with a compressive strength of 8.71 MPa, 6.44 MPa, and 3.62 MPa was used to infill 30 samples of each variation. A total of 30 T-connections were tested in compression to obtain its ultimate strength. The samples group M9, M6, and M3 had an average ultimate strength of 11.47 kN, 7.52 kN, and 9.34 kN respectively. Analysis of variance for grouped data was performed and it was known that each group have a significant difference in ultimate load to each other. To further analyze the relationship between the cement mortar, bamboo thickness, and ultimate load, multiple regression was performed, and it was known that both the cement mortar and bamboo thickness have a positive correlation to the ultimate load capacity of the T-connection. Characteristic compressive strength of the T-connection was also determined and resulted to M9 mix having 8.86 kN, M6 having 5.00 kN, and M3 having 3.07 kN. Comparing the result from previous study of Base Bahay Foundation Inc., it was known that having a cement mortar in the internode section of the bamboo increased the characteristic compressive strength by 524%.